Toshiba e-STUDIO281c Service Manual
  1. Manuals
  2. Brands
  3. Toshiba Manuals
  4. All in One Printer
  5. e-studio281c
  6. Service manual
Toshiba e-STUDIO281c Service Manual

Toshiba e-STUDIO281c Service Manual

Hide thumbs Also See for e-STUDIO281c:
1
2
3
4
5
6
Table Of Contents
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
Table of Contents

Advertisement

Quick Links

Download this manual See also: Service Handbook, Service Manual

SERVICE MANUAL

MULTIFUNCTIONAL DIGITAL COLOR SYSTEMS
e-STUDIO281c/351c/451c
File No. SME050004B0
R05032182501-TTEC
Ver02_2006-07

Advertisement

Table of Contents
loading

Related Manuals for Toshiba e-STUDIO281c

Summary of Contents for Toshiba e-STUDIO281c

  • Page 1: Service Manual

    SERVICE MANUAL MULTIFUNCTIONAL DIGITAL COLOR SYSTEMS e-STUDIO281c/351c/451c File No. SME050004B0 R05032182501-TTEC Ver02_2006-07...
  • Page 2 © 2005 TOSHIBA TEC CORPORATION All rights reserved Under the copyright laws, this manual cannot be reproduced in any form without prior written permission of TOSHIBA TEC CORPORATION. No patent liability is assumed, however, with respect to the use of the information contained herein.
  • Page 3 GENERAL PRECAUTIONS REGARDING THE SERVICE FOR e-STUDIO281c/351c/451c The installation and service should be done by a qualified service technician. 1) Transportation/Installation When transporting/installing the equipment, employ four persons and be sure to hold the posi- tions as shown in the figure.
  • Page 4 If these parts are short-circuited and their functions become ineffective, they may result in fatal accidents such as burnout. Do not allow a short-circuit or do not use the parts not recommended by Toshiba TEC Corporation. 4) Cautionary Labels During servicing, be sure to check the rating plate and cautionary labels such as “Unplug the power cable during service”, “CAUTION.
  • Page 5 5) Disposal of the Equipment, Supplies, Packing Materials, Used Batteries and IC-RAMs Regarding the recovery and disposal of the equipment, supplies, packing materials, used batter- ies and IC-RAMs including lithium batteries, follow the relevant local regulations or rules. Caution: Dispose of used batteries and IC-RAMs including lithium batteries according to this manual. Attention: Se débarrasser de batteries et IC-RAMs usés y compris les batteries en lithium selon ce manuel.

  • Page 7: Table Of Contents

    5.4.1 Dot matrix LCD circuit .................... 5-12 5.4.2 LED display circuit ....................5-14 5.5 Disassembly and Replacement ..................5-15 6. SCANNER ........................6-1 6.1 General Description ......................6-1 6.2 Construction......................... 6-2 6.3 Functions ..........................6-3 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTENTS...
  • Page 8 10.4 Description of Operation ....................10-4 10.4.1 Drive of rollers ......................10-4 10.4.2 Operation of bypass pickup roller ................10-4 10.4.3 Operation of drawer pickup roller ................10-5 10.4.4 Separation of paper ....................10-5 e-STUDIO281c/351c/451c CONTENTS June 2005 © TOSHIBA TEC...
  • Page 9 13.6.5 Color toner supply ....................13-7 13.6.6 During image quality control ................... 13-7 13.7 Disassembly and Replacement ..................13-8 14. TRANSFER UNIT......................14-1 14.1 General Descriptions ......................14-1 14.2 Construction........................14-2 14.3 Functions ........................... 14-3 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTENTS...
  • Page 10 18.3 Output Channel ......................... 18-3 18.4 Fuse........................... 18-5 18.5 Configuration of Power Supply Unit................... 18-6 18.6 Sequence of Power Supply ....................18-7 18.7 AC Wire Harness ....................... 18-8 19. PC BOARDS ....................... 19-1 e-STUDIO281c/351c/451c CONTENTS June 2005 © TOSHIBA TEC...

  • Page 11: Specifications/Accessories/Options/Supplies

    * Plain paper is selected for the paper type. * When the Reversing Automatic Document Feeder is used, copying in the speed of 28, 35 and 45 sheets per minute are only possible under the following conditions: June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES 1 - 1...
  • Page 12 • Mode: APS and Automatic density not selected, Plain paper mode • Number of copies: Black mode: 28 sheets or more (e-STUDIO281c), 35 sheets or more (e-STUDIO351c), 45 sheets or more (e-STUDIO451c) Color mode: 11 sheets or more • Reproduction ratio: 100% * The values in ( ) can be realized in the color mode.
  • Page 13 B4, LG 11 (2) 10 (2) A3, LD 10 (2) 10 (2) Bypass feed Paper supply Drawer Size not Paper size (A4/LT only) Size specified specified A4, LT 10 (3) June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES 1 - 3...
  • Page 14 * When originals are manually placed for single side, continuous copying. * The bypass copying speed is measured with the paper size specified. * The values in ( ) can be realized in the color mode. e-STUDIO281c/351c/451c SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES June 2005 © TOSHIBA TEC 1 - 4...
  • Page 15 (25 to 200% when using RADF) Resolution/Gradation....Scanning: 600 dpi x 600 dpi Printing: Equivalent to 2400 dpi x 600 dpi (black) Equivalent to 600 dpi x 600 dpi (color) June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES 1 - 5...
  • Page 16 Dimensions of the equipment...... See the figure below (W 660 x D 758 x H 739 (mm)) * When the tilt angle of the control panel is 45 degrees. 45° Fig.1-1 e-STUDIO281c/351c/451c SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES June 2005 © TOSHIBA TEC 1 - 6...

  • Page 17: Accessories

    Platen cover 1 pc. (for CND) * Machine version NAD: North America MJD: Europe AUD: Australia ASD: Asia, Argentine TWD: Taiwan Saudi Arabia Saudi Arabia, Asia China Korea JPD: Japan June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES 1 - 7...

  • Page 18: Options

    6. Up to 1 antenna (GN-3010) can be connected to the wireless LAN module (GN-1040/1041). 7. When the wireless LAN module (GN-1040/1041) and the bluetooth module (GN-2010) are installed together, only 1 antenna (GN-3010) can be connected to each. e-STUDIO281c/351c/451c SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES June 2005 © TOSHIBA TEC 1 - 8 06/07...

  • Page 19: Supplies

    Others PS-ZT3511TK PS-ZT3511CK Toner cartridge (Y) PS-ZT281C-Y(4) PS-ZT281C-EY(1) PS-ZT3511DY Others PS-ZT3511TY PS-ZT3511CY Toner cartridge (M) PS-ZT281C-M(4) PS-ZT281C-EM(1) PS-ZT3511DM Others PS-ZT3511TM PS-ZT3511CM Toner cartridge (C) PS-ZT281C-C(4) PS-ZT281C-EC(1) PS-ZT3511DC Others PS-ZT3511TC PS-ZT3511CC June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES 1 - 9...

  • Page 20: System List

    System List Fig.1-2 e-STUDIO281c/351c/451c SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES June 2005 © TOSHIBA TEC 1 - 10 06/07...

  • Page 21: Outline Of The Machine

    OUTLINE OF THE MACHINE Sectional View Front side view 7 5 3 32 31 Fig.2-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 1...
  • Page 22 ADU lower transport roller Developer sleeve Y ADU entrance sensor Mixer-F (Y) ADU exit sensor Mixer-R (Y) Receiving tray Color auto-toner sensor Pressure roller discharge brush e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 2 05/08...
  • Page 23 Rear side view (Drive system) CLT1 CLT17 CLT15 CLT8 CLT12 CLT9 CLT10 CLT16 CLT14 CLT2 CLT15 CLT3 CLT16 CLT13 CLT11 Fig.2-2 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 3...
  • Page 24 CLT12 Registration clutch CLT13 Upper transport clutch (Low speed) CLT14 Upper transport clutch (High speed) CLT15 Lower transport clutch (Low speed) CLT16 Lower transport clutch (High speed) e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 4...

  • Page 25: Electric Parts Layout

    Scanner unit PC board unit Control panel unit Fuser unit Automatic duplexing unit Bypass unit Transport unit Process unit Front side Laser unit Paper feeder unit Fig.2-3 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 5...
  • Page 26 Scanner unit [B-1] Motor, sensor, lamp A4 series Front side Fig.2-4 LT series Front side Fig.2-5 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 6...
  • Page 27 Switch, PC board, heater, thermostat, other part DH2* THMO2* DH1* Front side Fig.2-6 * ASD/AUD/CND/SAD/ASU/TWD/KRD model: Standard, NAD/MJD model: Option [C] Control panel unit Front side Fig.2-7 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 7...
  • Page 28 SOL1 Front side Fig.2-8 [D-2] Motor, sensor, switch, solenoid, lamp, heater, thermistor, thermostat SOL2 THM4 THMO3* DH3* Front side Fig.2-9 * ASD/AUD/CND/SAD/ASU/TWD/KRD model: Standard, NAD/MJD model: Option e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 8...

  • Page 29: Front Side

    [D-3] Motor, switch Front side Fig.2-10 Laser unit Front side Fig.2-11 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 9...
  • Page 30 Paper feeder unit CLT2 CLT3 Front side Fig.2-12 [G] Transport unit CLT5 Front side Fig.2-13 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 10...
  • Page 31 [H] Bypass unit CLT6 SOL3 Front side Fig.2-14 Automatic duplexing unit CLT7 Front side Fig.2-15 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 11...
  • Page 32 Fuser unit IH-COIL THMO1 THM2 Front side THM3 THM1 Fig.2-16 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 12...
  • Page 33 Drive unit CLT12 CLT14 CLT13 CLT8 CLT15 CLT9 CLT16 CLT10 CLT11 Front side Fig.2-17 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 13...
  • Page 34 PC board unit Front side Fig.2-18 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 14...

  • Page 35: Symbols And Functions Of Various Components

    Cooling down the power supply unit Power supply cooling fan INTRNL-FAN-MOT Cooling down the equipment inside 1-35 Internal cooling fan HDD-FAN-MOT Cooling down the HDD and SYS board 8-26 HDD cooling fan June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 15...
  • Page 36 Upper drawer feed sensor port at upper drawer feeding section FED-L-SNR Detecting paper jam and paper trans- 24-52 Lower drawer feed sensor port at lower drawer feeding section e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 16...
  • Page 37 Controlling cutoff and supply of the 24V 5-15 Cover opening/closing interlock switch voltage by opening/closing of the front cover or jam access cover SIDE-COV-SW Side cover opening/closing detection 24-51 Side cover opening/closing switch June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 17...
  • Page 38 SOL2 TNLVL-SHUT-SOL Driving the image quality sensor shut- 23-21 Image quality sensor shutter solenoid SOL3 SFB-SOL Driving the bypass pickup roller 22-11 Bypass pickup solenoid e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 18...
  • Page 39 Controlling the print engine section Logic PC board (LGC board) PWA-F-FIL Cutting noise of the AC power Power 7-11 Filter PC board (FIL board) supplying to each damp heater June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 19...
  • Page 40 KRD model: Standard NAD/MJD model: Option THMO3 THERMO-DRM-DH Controlling the temperature of the drum 35-24 Drum damp heater thermostat damp heater ASD/AUD/CND/SAD/ASU/TWD/ KRD model: Standard NAD/MJD model: Option e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 20...
  • Page 41 Hard disk data PS-ACC Generating DC voltage and supplying it Switching regulator to each section of the equipment BREAKER Preventing the inflow of overcurrent to Breaker the equipment June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 21...

  • Page 42: General Description

    General Description 2.4.1 System block diagram Fig.2-19 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 22 06/07...

  • Page 43: Construction Of Boards

    And it relays the control signal of the control panel from the SYS board to the LCD and KEY board. • KEY board: This is the board on which each button switch and each LED on the control panel are mounted. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 23...
  • Page 44 This is the unit to generate each DC voltage, which is used in the equipment, from external AC elec- tric power input. And then it is provided to each electric part. e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC...

  • Page 45: Disassembly And Replacement Of Covers

    Take off the front cover. Hinge pin Front cover Fig.2-21 Maintenance tray Remove 1 screw and take off the mainte- nance tray. Maintenance tray Fig.2-22 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 25...
  • Page 46 Tray back cover Fig.2-24 Front lower cover Take off the front cover ( P.2-25 "[A] Front cover"). Take off the black developer unit cover. Black developer unit cover Fig.2-25 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 26...
  • Page 47 Remove 2 screws and take off the center inner cover. Screw Screw Fig.2-27 [G] Front upper cover Remove 2 screws and take off the front upper cover. Front upper cover Fig.2-28 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 27...
  • Page 48 Take off the right front hinge cover P.2-28 "[I] Right front hinge cover"). Remove 2 screws and take off the front right cover. Front right cover Fig.2-31 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 28...
  • Page 49 Take off the left upper cover ( P.2-29 "[L] Left upper cover"). Remove 3 screws and take off the left rear cover. Left rear cover Fig.2-34 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 29...
  • Page 50 Remove 1 screw and take off the ozone filter cover ( P.11-23 "[Q] Ozone filter"). Remove 2 screws and take off the right rear cover. Right rear cover Fig.2-36 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 30...
  • Page 51 Remove 2 screws and take off the right lower cover. Right lower cover Fig.2-38 [R] Rear cover-1 Remove 1 screw and take off the connector cover. Connector cover Fig.2-39 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 31...
  • Page 52 Upper rear cover Left rear cover"). Take off the right rear cover ( P.2-30 "[O] Right rear cover"). Remove 2 screws and take off the upper rear cover. Fig.2-42 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 32...

  • Page 53: Disassembly And Replacement Of Pc Boards/Hdd

    Loosen 11 screws and take off the SYS board cover. SYS board cover Fig.2-44 Disconnect 1 connector. Remove 2 screws and take off the HDD cooling fan. HDD cooling fan Fig.2-45 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 33...
  • Page 54 Take off the SYS board cover ( P.2-33 "[A] HDD cooling fan (M21)"). Disconnect 2 connectors, remove 2 screws, and then take off the hard disk with the stay. Hard disk Fig.2-48 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 34...
  • Page 55 Right rear cover"). Take off the SYS board cover ( P.2-33 "[A] HDD cooling fan (M21)"). Loosen 2 screws and take off the PS cover. PS cover June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 35...
  • Page 56 Release harnesses from 4 harness clamps. Fig.2-52 Remove 4 screws. Take off the SYS board case while releasing the harness from the harness clamp. SYS board case Fig.2-53 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 36...
  • Page 57 LGC board cover Fig.2-54 Disconnect 21 connectors. Fig.2-55 Remove 4 screws, release 2 lock supports, and then take off the LGC board. LGC board Fig.2-56 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 37...
  • Page 58 LGC board (LGC)"). Disconnect 22 connectors. Fig.2-57 Release harnesses from 12 harness clamps. Fig.2-58 Remove 4 screws and take off the LGC board case. LGC board case Fig.2-59 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 38...
  • Page 59 Remove 1 harness clamp. Release the har- ness from 1 harness clamp. Remove 3 Switching regulator screws and take off the switching regulator unit unit while the unit is inclined. Fig.2-62 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 39...
  • Page 60 Remove 9 screws and take off the switching regulator cover. Switching regurator Fig.2-64 Remove 12 screws (1 screw fastened by a nut) and take off the switching regulator. Switching regurator Fig.2-65 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 40...
  • Page 61 P.2-32 "[S] Rear cover-2"). Take off the right lower cover ( P.2-31 "[Q] Right lower cover"). Remove 1 screw and take off the cover plate. Cover plate Fig.2-68 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 41...
  • Page 62 Filter bracket Fig.2-69 Disconnect 4 connectors and 2 terminals. Fig.2-70 Remove 2 screws, release 2 lock supports, and then take off the FIL board. FIL board Fig.2-71 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 42...
  • Page 63 Take off the LGC board case ( P.2-38 "[F] LGC board case"). Disconnect 4 connectors. Fig.2-72 Remove 4 screws and take off the DRV board. DRV board Fig.2-73 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 43...

  • Page 64: Removal And Installation Of Options

    Turn OFF the power and unplug the power cable. Take off the connector cover. Connector cover Fig.2-74 Disconnect the connector. Fig.2-75 Remove 1 screw and 1 washer on the rear side. Fig.2-76 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 44...
  • Page 65 Remove 1 screw on the rear side. Fig.2-77 Open the RADF. Fig.2-78 Remove 2 screws on the front side. Fig.2-79 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 45...
  • Page 66 Remove 1 screw and take off the gel cover. Fig.2-81 • Change the position of the screw for installing the damper holding bracket. Installing the RADF: A Installing the platen cover: B Fig.2-82 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 46...
  • Page 67 Rear cover-1 Fig.2-84 Remove 3 screws and take off the rear cover-2. Rear cover-2 Note: Disconnect the connector of the RADF first when the RADF is installed. Fig.2-85 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 47...
  • Page 68 Remove 2 screws and take off 2 fixing brack- ets on the rear side. Fixing bracket Fig.2-87 Take off the lower drawer of the equipment and PFP upper drawer. Fig.2-88 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 48...
  • Page 69 [C] KD-1012 (Large Capacity Feeder (LCF)) Turn OFF the power and unplug the power cable. Remove 1 screw and take off the connector cover of the equipment. Connector cover Fig.2-91 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 49...
  • Page 70 RADF is installed. Fig.2-93 Remove 1 screw and the ground wire, and then disconnect 2 connectors (3 if the optional damp heater is installed). Fig.2-94 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 50...
  • Page 71 Remove 2 screws and take off 2 fixing brack- ets on the rear side. Fixing bracket Fig.2-95 Take off the lower drawer of the equipment. Fig.2-96 Pull out the LCF drawer. Fig.2-97 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 51...
  • Page 72 [D] MJ-1022 (Hanging finisher) <When PFP/LCF is not installed> Turn OFF the power and unplug the power cable. Take off the connector cover and disconnect the connector. Connector cover Fig.2-100 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 52...
  • Page 73 Safety bracket Fig.2-101 Remove 2 screws and take off the safety bracket on the front side and the cover. Cover Safety bracket Fig.2-102 Remove 2 screws. Fig.2-103 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 53...
  • Page 74 Take off the connector cover and disconnect the connector. Connector cover Fig.2-105 Remove 2 screws and take off the cover on the rear side. Cover Fig.2-106 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 54...
  • Page 75 Remove 2 screws and take off the cover on the front side. Cover Fig.2-107 Remove 2 screws. Fig.2-108 Lift up the finisher and take it off. Fig.2-109 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 55...
  • Page 76 Connector cover Fig.2-110 Remove 1 screw and take off the finisher lower cover. Cover Fig.2-111 Remove 3 screws and take off the finisher front cover. Fig.2-112 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 56...
  • Page 77 Remove 1 screw. Fig.2-113 Remove 1 screw and take off the cover of the finisher rear side. Cover Fig.2-114 Remove 1 screw. Fig.2-115 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 57...
  • Page 78 Turn OFF the power and unplug the power cable. Take off the connector cover and disconnect the connector. Connector cover Fig.2-117 Open the finisher front cover and remove 1 screw. Fig.2-118 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 58...
  • Page 79 Cover Fig.2-119 Remove 1 screw. Fig.2-120 Take off the finisher. Note: Note: Be careful not to fell the finisher when moving the finisher unit only. Fig.2-121 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 59...
  • Page 80 Open the finisher front cover. Remove 1 screw and pull out the fixing plate. Fixing plate Fig.2-123 Loosen 1 screw and take off the ground wire. Fig.2-124 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 60 06/07...
  • Page 81 Take off the connector cover and disconnect connector. Connector cover Fig.2-126 Open the front cover of the hole punch unit and remove 1 screw. Fig.2-127 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 61 06/07...
  • Page 82 Take off the cover of the punch unit lower side. Cover Fig.2-128 Remove 1 screw. Fig.2-129 Remove 3 screws and take off the punch unit rear cover. Cover Fig.2-130 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 62...
  • Page 83 Take off the finisher with the hole punch unit. Note: Be careful not to fell the finisher when mov- ing the finisher unit only. Fig.2-132 Disconnect 2 connectors. Fig.2-133 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 63...
  • Page 84 Fig.2-135 MJ-6101 (Hole punch unit) Turn OFF the power and unplug the power cable. Take off the connector cover and disconnect the connector. Connector cover Fig.2-136 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 64 06/07...
  • Page 85 Open the finisher front cover. Remove 1 screw and pull out the fixing plate. Fixing plate Fig.2-138 Loosen 1 screw and take off the groune wire. Fig.2-139 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 65 06/07...
  • Page 86 Be careful not to fell the finisher when mov- ing only the finisher unit. Fig.2-140 Remove 1 screw and take off the connector cover. Connector cover Fig.2-141 Disconnect 1 connector. Fig.2-142 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 66 06/07...
  • Page 87 Fig.2-143 (10) Remove 1 screw and take off the cover. Cover Fig.2-144 (11) Remove 4 screws. Lift up the punch unit and take it off. Fig.2-145 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 67 06/07...
  • Page 88 Turn OFF the power and unplug the power cable. Remove 2 screws and take off the cover. Cover Fig.2-146 Disconnect 1 connector. Fig.2-147 Open the bridge unit. Remove 1 screw. Fig.2-148 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 68...
  • Page 89 Take off the cover. Cover Fig.2-149 Close the bridge unit and remove 1 screw. Fig.2-150 Remove 4 screws and take off the bracket. Bracket Fig.2-151 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE 2 - 69...
  • Page 90 Lift up the bridge unit and release the hook. Take off the bridge unit toward the front. Fig.2-152 e-STUDIO281c/351c/451c OUTLINE OF THE MACHINE June 2005 © TOSHIBA TEC 2 - 70...

  • Page 91: Copy Process

    (K→C→M→Y) on the transfer belt are transferred onto paper. 1st transfer roller Transfer belt Fuser unit 2nd transfer roller Color developer unit Black developer Main charger unit Laser optical unit Photoconductive drum Fig.3-2 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c COPY PROCESS 3 - 1...

  • Page 92: General Description Of Copying Process

    (5) Development: Negatively-charged toner is (10) Discharging: Eliminates the residual (–) made to adhere to the photoconductive charge from the surface of the photocon- drum, producing a visible image. ductive drum. e-STUDIO281c/351c/451c COPY PROCESS June 2005 © TOSHIBA TEC 3 - 2...

  • Page 93: Details Of Copying Process

    As this negative charge image on the drum is not visible to the human eye, it is called an “electro- static latent image.” Time ( t ) Colored area of original -500 White area of original Discharge Charging -1000 process process Electric potential of the photoconductive drum Fig.3-5 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c COPY PROCESS 3 - 3...
  • Page 94 The surface potential on the drum is determined by the grid potential and is controlled to a fixed value by the grid control circuit. Main charger Rotation of drum Grid control circuit High-voltage transformer Fig.3-6 e-STUDIO281c/351c/451c COPY PROCESS June 2005 © TOSHIBA TEC 3 - 4...
  • Page 95 RGB colors is then transmitted to the image processing section. ( Example ) CCD light Value of image receiving signals to be output amount Light Difference between "light " and "dark" is divided into 256 steps. Dark Fig.3-8 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c COPY PROCESS 3 - 5...
  • Page 96 (laser emission) by the semiconductor laser element, which are then used to expose the drum surface, thus forming an electrostatic latent image there. Image Laser driving processing PC board section Polygonal mirror Semiconductor laser element Drum Fig.3-9 e-STUDIO281c/351c/451c COPY PROCESS June 2005 © TOSHIBA TEC 3 - 6...
  • Page 97 Image is developed by toner - 300V When the (–) potential of the photoconductive drum is lower than - 200V the developer bias. - 100V Fig.3-12 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c COPY PROCESS 3 - 7...
  • Page 98 1. Image density is lowered. 2. Toner scattering occurs. 3. Background fogging occurs. Solution: Replace the developer material. Toner Carrier Where toner is caked, no frictional electrification occurs. Fig.3-14 e-STUDIO281c/351c/451c COPY PROCESS June 2005 © TOSHIBA TEC 3 - 8...
  • Page 99 ↓ This is caused by the lines of magnetic force between the south and north poles. Lines of magnetic force Photoconductive drum Magnetic roller Fig.3-15 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c COPY PROCESS 3 - 9...
  • Page 100 In the copy process of this equipment, images are transferred in the order of K→C→M→Y on the transfer belt. Transfer belt Photoconductive drum Fig.3-16 1st transfer roller Transfer belt Toner Fig.3-17 e-STUDIO281c/351c/451c COPY PROCESS June 2005 © TOSHIBA TEC 3 - 10...
  • Page 101 The paper is subjected to the heat and pressure when passing through the fuser belt and the pres- sure roller. ↓ (Fusing) The toner on the paper is fused to it. Separation roller Fuser belt Press roller Fuser roller Fig.3-19 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c COPY PROCESS 3 - 11...
  • Page 102 The edge of the conductive blade is pressed against the photoconductive drum surface to scrape off residual toner. The toner removed is then caught by the recovery blade. Recovery blade Drum rotation Conductive blade Fig.3-21 e-STUDIO281c/351c/451c COPY PROCESS June 2005 © TOSHIBA TEC 3 - 12...
  • Page 103 All of the (–) charge remaining on the photoconductive drum is conducted away to ground (However, (+) charge is eliminated by the conductive blade as mentioned in 9)). ↓ Preparation for the next copying process is completed. Photoconductive drum Discharge LED array Fig.3-22 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c COPY PROCESS 3 - 13...

  • Page 104: List Of Copying Process Conditions

    ← 3) Transfer charge 3) Simultaneous cleaning and dis- removal charging by the conductive blade ← 9. Transfer belt cleaning Blade cleaning (contact/release mechanism) ← 10.Discharge LED array (red) e-STUDIO281c/351c/451c COPY PROCESS June 2005 © TOSHIBA TEC 3 - 14...
  • Page 105 2) Oil roller method ← Oil roller (ø18) ← Cleaning roller (ø16) ← 3) Heat roller tempera- 3) ON/OFF control and power control ture by thermistor ← 4) Heater 4) IH coil June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c COPY PROCESS 3 - 15...
  • Page 106 COPY PROCESS June 2005 © TOSHIBA TEC 3 - 16...

  • Page 107: General Operation

    GENERAL OPERATION Overview of Operation Operation of equipment Operation during initializing, pre-running and ready Drawer feed copying by the [ START ] button Copying operation Bypass feed copying Interrupt copying June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 1...

  • Page 108: Description Of Operation

    → When no button is pressed for a certain period of time, - Set number “1” and reproduction ratio “100%” are displayed. Equipment returns to the normal ready state. e-STUDIO281c/351c/451c GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 2...

  • Page 109: Drawer Feed Copying (Upper Drawer Paper Feeding)

    → Exposure lamp (EXP) turned OFF → Registration clutch (CLT12) turned OFF (after the trailing edge of the paper passed the registra- tion roller) → “READY (PRINTING)” is displayed June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 3...
  • Page 110 → Revolver motor (M12) turned ON Revolver rotates 55 degrees to move to escape position → Transfer belt marker detection → 2nd transfer roller contact clutch (CLT5) and 2nd transfer bias turned ON e-STUDIO281c/351c/451c GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 4...
  • Page 111 → Drum, fuser unit and developer unit are stopped Fans return to rotate at the normal rotation speed → “READY” is displayed and the equipment enters into ready mode June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 5...
  • Page 112 Timing chart for copying (A4/LT size, 1 sheet from upper drawer) 1) Color copy e-STUDIO281c/351c/451c GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 6...
  • Page 113 2) Black copy June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 7...

  • Page 114: Bypass Feed Copying

    → LED “INTERRUPT” is turned OFF by pressing the [INTERRUPT] button, and the equipment returns to the status before the interruption. → “Ready to resume job 1” is displayed. 4) Press the [START] button The copying operation before the interruption is resumed. e-STUDIO281c/351c/451c GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 8...

  • Page 115: Detection Of Abnormality

    (D) No toner in the cartridge (E) Developer unit not installed properly (F) Toner bag replacement 3) Abnormality not cleared without turning OFF the main switch (G) Call for service June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 9...

  • Page 116: Description Of Abnormality

    At this time, if the empty sensor is It is judged that there is paper. OFF: It is judged that there is no paper. Drawer area of the control panel blinks. (When the drawer is selected) e-STUDIO281c/351c/451c GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 10...
  • Page 117 * Registration sensor (S22) is not turned ON in a fixed period of time (E120) Bypass misfeeding Bypass misfeed symbol is displayed The copying operation is disabled. Solution: The bypass sensor (S35) is turned OFF by removing the paper from the bypass tray. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 11...
  • Page 118 The registration sensor (S22) is not turned ON in a fixed period of time after the leading edge of paper passed the transport roller. Paper jam (E120, E200, E210, E300, E330 and E3C0) e-STUDIO281c/351c/451c GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 12...
  • Page 119 Solution: Connect the connectors of the developer unit and close the front cover. (F) Toner bag replacement • Toner bag is full of used toner Toner recovery auger shifts to the rear side: Toner bag full detection sensor (S20) ON June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 13...
  • Page 120 (G)Call for service Check the error code displayed on the control panel when “Call for service” appears, and handle the abnormality in reference to the error code table in Service Handbook. e-STUDIO281c/351c/451c GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 14...

  • Page 121: Flow Chart

    Revolver initialization finished? Paper jam Performs image "E030" quality control Image quality control finished propery? Call for service "CE10" Polygonal motor low "CE20" speed rotation ON "CE40" "CE50" "CE90" June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 15...
  • Page 122 Tray-up motor OFF "C440" IH coil broken? Call for service IH coil OFF Polygonal motor condition Call for service "CA10" abnormal? READY "C470" IH error? Call for service "C480" "C490" e-STUDIO281c/351c/451c GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 16...

  • Page 123: Automatic Feed Copying

    Exit sensor check leading edge? Paper jam "E010" Exit sensor check trailing edge? Paper jam "E020" Main motor OFF Transport motor OFF Developer motor OFF Exit motor OFF READY READY June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 17...
  • Page 124 Color developer bias ( AC ) ON Discharge LED OFF Color developer drive clutch ON Cleaning blade bias OFF Color developer bias (-) ON Polygonal motor low speed rotation ON Processing system control completed e-STUDIO281c/351c/451c GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 18...
  • Page 125 Black developer bias (-) OFF Main charger OFF 2nd transfer roller contact clutch OFF 2nd transfer bias OFF Transfer belt cleaner clutch OFF Transfer belt cleaner auger motor OFF 1st transfer bias OFF June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c GENERAL OPERATION 4 - 19...
  • Page 126 GENERAL OPERATION June 2005 © TOSHIBA TEC 4 - 20...

  • Page 127: Control Panel

    LEDs and an LCD to display the state of the equipment or the messages. When the operator’s attention is required, graphic symbols appear with messages explaining the condi- tion of the equipment in the LCD panel. Fig.5-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTROL PANEL 5 - 1...

  • Page 128: Items Shown On The Display Panel

    Displays buttons and messages. Fig.5-2 2) Paper jam display Displays error code, paper jam position and paper jam release guidance. Error code Paper jam position Paper jam release guidance Fig.5-3 e-STUDIO281c/351c/451c CONTROL PANEL June 2005 © TOSHIBA TEC 5 - 2...
  • Page 129 3) Service call display Displays error code and service call symbol. Error code Service call symbol Fig.5-4 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTROL PANEL 5 - 3...

  • Page 130: Message

    IS FULL) READY Saddle stitcher tray is full of paper (SADDLE STITCH TRAY • Scanning is enabled FULL) READY Incorrect paper size setting (CHANGE DRAWER TO CORRECT PAPER SIZE) e-STUDIO281c/351c/451c CONTROL PANEL June 2005 © TOSHIBA TEC 5 - 4...
  • Page 131 Select the same size Displayed when the size of insertion insert1 sheets as the origi- sheet (sheet 1) is different from that nals of other pages at Sheet Insertion Mode June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTROL PANEL 5 - 5...
  • Page 132 Check DEPARTMENT department counter COUNTER Cannot copy TWIN COLOR Displayed when the number of print- mode outs exceeds the limit number of Check DEPARTMENT department counter COUNTER e-STUDIO281c/351c/451c CONTROL PANEL June 2005 © TOSHIBA TEC 5 - 6...
  • Page 133 PRESS [BASIC] and select Displays the warning that the copy is normal paper size not enabled when any drawer but bypass feed is selected at Cover Sheet Mode or Sheet Insertion Mode. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTROL PANEL 5 - 7...
  • Page 134 Code can no be keyed in immedi- code again ately after power-ON. Set standard size Displayed when the paper size which Reset the paper size is not acceptable is set (depends on the setting) e-STUDIO281c/351c/451c CONTROL PANEL June 2005 © TOSHIBA TEC 5 - 8...

  • Page 135: Relation Between The Equipment State And Operator's Operation

    Display not changed Display not Display not changed [TEMPLATE] screen changed button Press [USER Displays USER FUNC- Display not changed Display not Display not changed FUNCTIONS] TIONS screen changed button June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTROL PANEL 5 - 9...
  • Page 136 Display not Display not TOR/ PAUSE] changed changed changed changed changed button Press [FAX] Displays FAX Display not Display not Displays FAX Displays FAX button screen changed changed screen screen e-STUDIO281c/351c/451c CONTROL PANEL June 2005 © TOSHIBA TEC 5 - 10...
  • Page 137 ING” and RADF changed “COPYING” “COPYING” and mode is cleared original set on starts feeding and RADF RADF starts feed- and displays RADF starts feeding BASIC screen June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTROL PANEL 5 - 11...

  • Page 138: Description Of Operation

    It consists of a driver LSI, frame, printed circuit board, and lateral type CCFL backlight. * STN: Super Twisted Nematic * CCFL: Cold Cathod Fluorescent Lamp 2) Block diagram XSCL LCDEN LCD panel 640 x 240 dots Power supply Fig.5-6 e-STUDIO281c/351c/451c CONTROL PANEL June 2005 © TOSHIBA TEC 5 - 12...
  • Page 139 Analog Touch panel input Decoder Serial data Panel processing Hard-key matrix LED driver Buzzer Fig.5-7 4) Data Transmission 1/tF 1/tF FRAME LOAD FRAME LOAD CP x(640/4) pulses D0-D3 Fig.5-8 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTROL PANEL 5 - 13...

  • Page 140: Led Display Circuit

    (a) The transistor (Q3) connected to the LED anode is ON. (b) The output from the cathode side of the LED is “L” level. The LED turns ON when the conditions (a) and (b) are met. e-STUDIO281c/351c/451c CONTROL PANEL June 2005 © TOSHIBA TEC 5 - 14...

  • Page 141: Disassembly And Replacement

    “b”, remove the stopper or move it to the position “a”. Fig.5-10 Stopper Slide the stopper and pull it out. Stopper Fig.5-11 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTROL PANEL 5 - 15...
  • Page 142 Lower the control panel and remove 4 screws. Take off the control panel unit while sliding it. Control panel unit Fig.5-13 Remove 3 screws and take off the cover. Cover Fig.5-14 e-STUDIO281c/351c/451c CONTROL PANEL June 2005 © TOSHIBA TEC 5 - 16...
  • Page 143 Release the harness from 2 harness clamps. (10) Remove 1 screw and take off the DSP board. DSP board Fig.5-16 (11) Remove 4 screws and take off the LCD. Fig.5-17 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c CONTROL PANEL 5 - 17...
  • Page 144 (12) Remove 16 screws and take off the KEY board. KEY board Fig.5-18 e-STUDIO281c/351c/451c CONTROL PANEL June 2005 © TOSHIBA TEC 5 - 18...
  • Page 145 Blue). These lines are composed with 3-line color devices and black-and-white device with no filter. Lens RADF original glass Reflector Original glass Exposure lamp Drive pulley Rail for carriage-2 Rail for carriage-1 Carriage-2 SLG board Carriage-1 CCD board Fig.6-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 1...
  • Page 146 Other Scanning section control PC board (SLG) Scanner unit cooling fan (M15) Damp heater (DH1, DH2 THMO2) Carriage home position sensor (S6) Platen sensor (S7) Main switch (S41) Rubber damper e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 2...
  • Page 147 This is a plate to efficiently direct the light from the exposure lamp (EXP) to the surface of the original on the glass. Mirror-1 This mirror directs the light reflected from the original to the mirror-2 described later. Original glass Original Exposure lamp Lamp inverter Reflector Mirror-1 Fig.6-3 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 3...
  • Page 148 The size of an original placed on the glass is instantly detected using the automatic original detec- tion sensors (S1-5) (APS sensor) fixed on the base frame without moving the carriage-1. e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 4...

  • Page 149: Scan Motor (M1)

    The carriage-1 stays at the shading position during shading correction, and at the scanning posi- tion during scanning operation. • Scanning velocity The scanning velocity at color modes is reduced to a half of it at the Black Mode. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 5...

  • Page 150: Scanning Drive Circuit

    Reset for the whole system Internal circuit of the driver is initialized by setting the motor to “L” level. The motor drive circuit is automatically reset when the power is turned ON. e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 6...

  • Page 151: Initialization At Power-On

    Error handling position sensor position sensor Carriage home position Deceleration Stop data set Deceleration Stop Moving peak detection position Peak detection Completion of initialization Moving carriage waiting position Scanning command Fig.6-8 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 7...

  • Page 152: Control Of Exposure Lamp (Exp)

    Black reference formation - reads the light amount at the regulation position with the exposure lamp (EXP) lights OFF Original Shading correction plate Exposure lamp ( Xenon lamp ) Lighting device for xenon lamp (Inverter board) CCD sensor SLG board Scanner CCD board Fig.6-9 e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 8...

  • Page 153: Exposure Lamp (Exp)

    ( 4 ) Ultraviolet lay ( 5 ) Fluorescer ( 6 ) Visible light ( irradiated from the opening to outside the pipe ) ( 7 ) Openig ( 8 ) Harness Fig.6-11 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 9...

  • Page 154: Control Circuit For The Exposure Lamp

    +5VSW ON signal Controls +5VSW by CPU. Normally “L” WDTOUT Watchdog timer signal “L” is output when CPU is out of control LMPEN Exposure lamp enable signal Normally “L” Xenon lamp e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 10...

  • Page 155: General Description Of Ccd Control

    ( S-K) I = k ( W- K) Coefficient Image data before correction Black data (stored in "Black" memory) White data (stored in "White" memory) June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 11...

  • Page 156: Automatic Original Size Detection Circuit

    (when scanning black image). [ A4 Series ] [ LT Series ] Original Original glass Original Original glass APS-R APS-R APS-3 APS-3 APS-2 APS-1 APS-C APS-C APS-2 Fig.6-14 e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 12...

  • Page 157: Process Of Detection Of Original Size

    [ A4 Series ] [ LT Series ] APS-R APS-R APS-C APS-C Reflection type Reflection type Scanner Scanner APS-3 photosensor photosensor APS-3 APS-2 APS-1 APS-2 SLG board SLG board Fig.6-15 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 13...
  • Page 158 Sensor detection points [A4 Series] APS-R APS-C A5–R B5–R A4–R APS-3 APS-1 APS-2 Fig.6-16 [LT Series] APS-R APS-C ST–R APS-3 LT–R APS-1 Fig.6-17 e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 14...
  • Page 159 * When the platen sensor (S7) is ON; The latest original size (or no original state) recognized right before the platen sensor (S7) is turned ON is retained regardless of the status the APS sensor output signals. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 15...
  • Page 160 The light emitting diode is driven by a pulse having a 130 µsec. cycle and an 8 µsec. ON time. When the phototransistor receives the same signal as this pulse, it is determined that there is an original. The pulse modulation is performed inside the reflection type phototransistor. e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 16...

  • Page 161: Disassembly And Replacement

    Fig.6-20 Lens cover Take off the original glass ( P.6-17 "[A] Original glass"). Disconnect 1 connector, remove 6 screws Lens cover and take off the lens cover. Fig.6-21 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 17...
  • Page 162 LT series (APS-1, -3, -C, -R) Take off the original glass ( P.6-17 "[A] Original glass"). Disconnect 1 connector and remove 1 screw for each APS sensor. Take off 4 APS sen- sors. Fig.6-23 e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 18...
  • Page 163 Release the harness from the harness clamp. Fig.6-25 Move the carriage-1 to the position where the side of the frame is cut out. Fig.6-26 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 19...
  • Page 164 Remove 1 screw. Exposure lamp Lift up the front side of the exposure lamp and take off by sliding it. Fig.6-27 e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 20...
  • Page 165 3. Do not touch 6 screws shown with the arrows when replacing the lens unit. Fig.6-29 4. Handle the unit with care. Do not touch the adjusted area and lens. (Hold the unit as the right figure.) Fig.6-30 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 21...
  • Page 166 4. The scan motor is pulled by the belt ten- sion jig. Fix the screw B and then C at the stopped position. 5. Remove the belt tension jig. Fig.6-33 e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 22...
  • Page 167 Then take off the carriage-1. Note: When replacing the mirror-1, replace the car- riage-1 together with mirror-1. Mirror-1 should not be removed. Fig.6-36 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 23...
  • Page 168 Attach the wire holder jigs to the pulleys to prevent the wires from loosening. Note: Refer to “3.9 Adjustment of the Scanner Sec- tion” in the Service Handbook for the direc- tion of the wire holder jigs. Fig.6-39 e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 24...
  • Page 169 Platen sensor and take off the platen sensor. Remove the seal. Disconnect 1 connector. Release the latches and take off the carriage home position sen- sor. Carriage home position sensor Fig.6-42 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER 6 - 25...
  • Page 170 P.2-32 "[T] Upper rear cover") Disconnect 1 connector. Release the har- ness from the harness clamp. Remove 2 screws and take off the scanner unit cooling fan. Scanner unit cooling fan Fig.6-44 e-STUDIO281c/351c/451c SCANNER June 2005 © TOSHIBA TEC 6 - 26...

  • Page 171: Image Processing

    Scanner high quality image processing, printer high quality image pro- cessing, black over print, pure black/pure gray, chroma adjustment and brightness adjustment LGC board Smoothing processing, image area control and laser related control June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c IMAGE PROCESSING 7 - 1...
  • Page 172 Images are processed by the SYS board and LGC board in this equipment. Also, the image signals read with the Scanning Function and the printer image signals are processed in the SYS board. e-STUDIO281c/351c/451c IMAGE PROCESSING June 2005 © TOSHIBA TEC 7 - 2...

  • Page 173: Construction

    Scanner high quality image processing Page memory control Printer high quality image processing LGC board ASIC : Image data flow Laser related control Smoothing processing LDR board ASIC Laser drive Fig.7-3 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c IMAGE PROCESSING 7 - 3 06/07...

  • Page 174: System Control Pc Board (Sys)

    K (Black) signal is generated from the CMY image data. Based on this K signal, the CMY image data is corrected to suppress hue on reproducing grays or to make the black look more real. e-STUDIO281c/351c/451c IMAGE PROCESSING June 2005 © TOSHIBA TEC 7 - 4...
  • Page 175 Density of the targeted pixel position is X. Density of pixel positions at front and back of the tar- geted pixel are “a” and “b” respectively. X is converted to X’ through the low pass filtering. When the matrix is (3 x 1): a+b+x x' = June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c IMAGE PROCESSING 7 - 5...
  • Page 176 Enlargement/Reduction Enlargment/Reduction is accomplished by using the line memory control function in the process of the image processing operation. <Example> Enlargement 100% 200% e-STUDIO281c/351c/451c IMAGE PROCESSING June 2005 © TOSHIBA TEC 7 - 6...
  • Page 177 This function corrects the image signals scanned by the scanner and reproduces them in a higher image quality. 12)Printer high quality image processing This function reproduces the image signals output from the printer controller in a higher image qual- ity. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c IMAGE PROCESSING 7 - 7...
  • Page 178 4 color toner. The gray text/graphics are also printed out with black toner only. 15)Chroma adjustment (PCL5C) This function adjusts chromaticness of the printer data. 16)Brightness adjustment (PCL5C) This function adjusts brightness of the printer data. e-STUDIO281c/351c/451c IMAGE PROCESSING June 2005 © TOSHIBA TEC 7 - 8...

  • Page 179: Logic Pc Board (Lgc)

    2) Image area control This function sets the effective image area in horizontal and vertical directions to be output. 3) Laser related control This function performs the APC (Auto Power Control). June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c IMAGE PROCESSING 7 - 9...
  • Page 180 IMAGE PROCESSING June 2005 © TOSHIBA TEC 7 - 10...

  • Page 181: Laser Optical Unit

    The unit must not be disassembled in the field as they are very sensitive to dust and finely adjusted at the factory. Fig.8-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c LASER OPTICAL UNIT 8 - 1...
  • Page 182 Slit glass ( for outgoing laser beam ) Mirror Cylinder lens SNS board LDR board f lens-2 Aperture f lens-1 Polygonal motor Finite focus lens Fig.8-2 e-STUDIO281c/351c/451c LASER OPTICAL UNIT June 2005 © TOSHIBA TEC 8 - 2...

  • Page 183: Structure

    Polygonal motor unit Polygonal motor (M4) Polygonal mirror 8 planes Polygonal mirror cover fθ lens 1 fθ lens 2 Mirror Slit glass H-sync signal detection PC board (SNS) June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c LASER OPTICAL UNIT 8 - 3...
  • Page 184 "CAUTION. HOT", "CAUTION. HIGH VOLTAGE", "CAUTION. LASER BEAM", etc. to see if there is any dirt on their surface and if they are properly stuck to the equipment. e-STUDIO281c/351c/451c LASER OPTICAL UNIT June 2005 © TOSHIBA TEC 8 - 4...
  • Page 185 One scan is completed by completion of steps (A) to (C). One scan is performed on one plane of the polygonalmirror. Eight scans can be made with one rotation of the polygonal mirror. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c LASER OPTICAL UNIT 8 - 5...
  • Page 186 PC board (SNS). The primary scanning synchronizing signal is generated based on this reflection. 5) Slit glass Slit glass is located where the laser beams are output from the laser optical unit, and it protects the unit from dust. e-STUDIO281c/351c/451c LASER OPTICAL UNIT June 2005 © TOSHIBA TEC 8 - 6...

  • Page 187: Laser Diode

    Power source Semiconductive laser Laser power Laser driver comparison circuit Constant circuit optical output Monitor efficiency regulation circuit Monitor output Fig.8-8 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c LASER OPTICAL UNIT 8 - 7...

  • Page 188: Laser Unit Cooling Fan

    Laser Unit Cooling Fan The laser unit cooling fan is a propeller fan (80 x 80 mm). It cools down the polygonal motor and the Laser driving PC board (LDR). e-STUDIO281c/351c/451c LASER OPTICAL UNIT June 2005 © TOSHIBA TEC 8 - 8...

  • Page 189: Polygonal Motor (M4)

    LGC board controls the polygonal motor (M4). Signal Level “L” Level “H” Remarks POMON Polygonal motor ON/OFF signal POMCK Polygonal motor reference clock signal POMPL Locked Unlocked Polygonal motor PLL signal June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c LASER OPTICAL UNIT 8 - 9...

  • Page 190: Laser Driving Pc Board (Ldr)

    Reference clock signal in the printer section synchronized with HSYNC and its signal. 3) Laser drive section ON/OFF control of the semiconductive laser and APC (Auto Power Control). APC : Adjusts disparity of the laser intensity caused by temperature e-STUDIO281c/351c/451c LASER OPTICAL UNIT June 2005 © TOSHIBA TEC 8 - 10...

  • Page 191: Disassembly And Replacement

    Release the harnesses from the harness clamp. Fig.8-11 Take off the left cover. P.2-29 "[K] Left cover") Remove 2 screws and take off the toner cover. Toner cover Fig.8-12 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c LASER OPTICAL UNIT 8 - 11...
  • Page 192 Remove 2 screws and take off the left inner cover. Screw Left inner cover Fig.8-14 Disconnect 1 connector and remove 2 screws. Take off the laser unit cooling fan. Laser unit cooling fan Fig.8-15 e-STUDIO281c/351c/451c LASER OPTICAL UNIT June 2005 © TOSHIBA TEC 8 - 12...

  • Page 193: Drive System

    Exit roller • Toner motor (M3) Black toner cartridge • Drum cleaner brush motor (M8) Drum cleaner brush • Transfer belt cleaner auger motor (M2) Transfer belt cleaner auger June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 1...

  • Page 194: Main Motor (M6)

    ( G45/G21 ) ( G32 ) ( G27/G20 ) ( G31 ) ( G19 ) ( G40/G23 ) ( G47 ) ( G252 ) Coupling ( Drum ) Fig.9-1 e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 2...

  • Page 195: Drive Circuit Of Main Motor

    (M6). The speed is lowered to the range from 1/2 to 1/3 at the Thick Paper / OHP Film Mode. This switching is performed between the completion of the 1st trans- fer and that of the 2nd transfer. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 3...

  • Page 196: Transport Motor (M9)

    ( G25 ) Upper transport clutch ( High speed ) ( G27 ) ( G28 ) ( G31/G38 ) Upper transport clutch ( Low speed ) ( G28 ) Fig.9-3 e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 4...

  • Page 197: Drive Circuit Of Transport Motor

    — Transport motor reference clock signal FDMPL Unlocked Locked Transport motor PLL signal * FDMCW (rotational direction signal): The motor does not rotate backward (CCW) in actual move- ment. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 5...

  • Page 198: Developer Motor (M11)

    ( G43 ) ( G15 ) ( G33/G16 ) ( G43 ) ( G17 ) Black developer lifting clutch Black developer drive clutch ( G28 ) ( G28 ) Fig.9-5 e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 6...
  • Page 199 *2 : Color developer toner supply clutch *3 : Developer motor *4 : Color developer driver clutch *5 : Black developer driver clutch Developer sleeve *6 : Transfer belt cleaner clutch June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 7...

  • Page 200: Drive Circuit Of Developer Motor

    Level “H” Remarks DVMON Developer motor ON signal DVMCW Developer motor rotational direction signal DVMCK — — Developer motor reference clock signal DVMPL Locked Unlocked Developer motor PLL signal e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 8...

  • Page 201: Disassembly And Replacement

    Remove 3 screws and take off the flywheel. Flywheel Fig.9-7 Remove 2 screws and take off the bracket. Bracket Fig.9-8 Open the mylar sheet. Release the harness from 2 harness clamps. Mylar sheet Fig.9-9 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 9...
  • Page 202 (10) Disconnect 3 connectors and release the harness from 2 harness clamps. Fig.9-11 (11) Remove 5 screws and take off the developer Developer motor drive unit motor drive unit. Fig.9-12 e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 10...
  • Page 203 1 gear, and then take off the black devel- oper lifting clutch. Note: Place the stopper when installing the clutch. Connector Bushing Gear Black developer lifting clutch Fig.9-15 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 11...
  • Page 204 1 clip, and then take off the Gear color developer toner supply clutch. Bushing Note: Connector Place the stopper when installing the clutch. Clip Bushing Color developer toner supply clutch Fig.9-18 e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 12...
  • Page 205 Gear Connector (10) Disconnect 1 connector and take off the color developer drive clutch. Note: Place the stopper when installing the clutch. Clip Color developer drive clutch Bushing Fig.9-21 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 13...
  • Page 206 Remove 1 screw and take off the bracket. Remove 1 screw and take off the cover plate. Cover plate Fig.9-23 (10) Remove 2 screws and take off the bracket. Bracket Fig.9-24 e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 14...
  • Page 207 Fig.9-25 (13) Loosen 1 setscrew and disconnect 1 connec- tor. Setscrew (14) Release the harness from 1 harness clamp. Fig.9-26 (15) Take off the registration clutch. Registration clutch Fig.9-27 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 15...
  • Page 208 (High speed) with the gear. Setscrew Note: Do not mix up the registration clutch and upper transport clutch (High speed) when installing them. Upper transport clutch (High speed) Gear Fig.9-30 e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 16...
  • Page 209 Fig.9-31 (19) Remove 5 screws and take off the transport motor drive unit. Transport motor drive unit Fig.9-32 (20) Remove 2 screws and take off the bracket. Bracket Fig.9-33 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 17...
  • Page 210 ( P.11-24 "[R] Ozone exhaust fan (M18)"). Disconnect 1 connector. Release 1 lock support, remove 2 screws, and take off the transport motor. Transport motor Fig.9-36 e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 18...
  • Page 211 (10) Remove 3 screws and take off the drum cleaner brush motor with the bracket. Bracket Fig.9-38 (11) Remove 2 screws and take off the drum cleaner brush motor. Drum cleaner brush motor Fig.9-39 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRIVE SYSTEM 9 - 19...
  • Page 212 P.2-38 "[F] LGC board case"). Take off the SYS board case P.2-35 "[D] SYS board case"). Disconnect 1 connector, remove 4 screws and take off the main motor. Main motor Fig.9-42 e-STUDIO281c/351c/451c DRIVE SYSTEM June 2005 © TOSHIBA TEC 9 - 20...

  • Page 213: Paper Feeding System

    Upper drawer pickup roller Upper drawer feed sensor (S23) Transport roller Lower drawer feed sensor (S24) Lower drawer feed roller Bypass feed sensor (S36) Lower drawer separation roller June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 1...

  • Page 214: Construction

    Registration clutch (CLT12) Transport clutch (CLT13, 14, 15, 16) Drawer detection switch (S33, 34) Drawer feed sensor (S23, 24) Registration sensor (S22) Transport motor (M9) Tray-up motor (M10) e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 2...

  • Page 215: Functions

    10)Registration sensor (S22) This sensor detects that the leading edge of the paper has reached the registration roller and the trailing edge of the paper has passed the registration roller. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 3...

  • Page 216: Description Of Operation

    The roller is rotated by this driving force. Bypass pickup solenoid Spring Pickup roller Lever Pickup arm Fig.10-2 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 4...

  • Page 217: Operation Of Drawer Pickup Roller

    Feed roller Spring joint Separation rolle Fig.10-4 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 5...

  • Page 218: General Operation

    At ready status, the tray remains at raised position. 2) When a drawer is inserted or removed at ready status, the tray is raised again to check the availabil- ity of paper. e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 6...
  • Page 219 • The registration clutch (CLT12) and transport clutch (low speed) (CLT13) are turned ON and the paper is transported to the 2nd transfer position. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 7...

  • Page 220: Drive Circuit Of Tray-Up Motor

    IN1 and IN2 are input terminals to receive the signals from the gate array. The control logic, based on the signals from the gate array, controls ON/OFF of the motor rotation direction. Input Output Remarks M(+) M(-) BRAKE OFF (high impedance) STOP e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 8...
  • Page 221 Bypass feed front cover Fig.10-8 Remove 1 screw. Open the bypass feed tray and take off the bypass feed rear cover. Bypass feed rear cover Fig.10-9 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 9 05/08...
  • Page 222 Disconnect 1 connector and release the har- ness from the harness clamp. Connector Fig.10-11 Remove 2 screws and slide the hinge assembly to take it off with the tray. Tray Hinge assembly Fig.10-12 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 10 05/08...
  • Page 223 Fig.10-14 Remove 1 screw for the plate spring. And remove 1 screw on the tray side and take off Plate spring Bracket the bracket. Fig.10-15 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 11...
  • Page 224 Take off the bypass unit ( P.10-9 "[A-1] Bypass unit"). Bypass feed upper cover Remove 1 screw and slide the bypass feed upper cover to take it off. Fig.10-18 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 12...
  • Page 225 Remove 4 screws and take off the upper Upper plate plate. Fig.10-20 Remove 1 spring. Disconnect 1 connector and take off the bypass pickup solenoid with the solenoid arm. Bypass pickup solenoid Solenoid arm Fig.10-21 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 13...
  • Page 226 Take off the sensor arm. Sensor arm Fig.10-23 Disconnect the connector from the sensor and release the latch to take off the bypass paper sensor. Bypass paper sensor Fig.10-24 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 14...
  • Page 227 4. Check that there is no stain such as oil on the surface of timing belt, the pulley and the roller. Fig.10-26 5. Install the bypass pickup roller and the bypass feed roller in the correct direction. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 15 05/08...
  • Page 228 Remove 3 screws and take off the bracket. Remove the bushing and the bypass feed clutch. Bypass feed clutch Note: Match the protruding portion of the clutch Bushing and bracket for assembling. Bracket Fig.10-29 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 16 05/08...
  • Page 229 Detach the cover, the arbor, and the clutch spring from the shaft, and then take off the Arbor bypass separation roller. Shaft Clutch spring Cover Bypass separation roller Fig.10-32 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 17...
  • Page 230 Note: Be careful not to come off the sensor arm and the sensor spring after taking off the sensor. Sensor spring Sensor arm Bypass feed sensor Fig.10-35 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 18...
  • Page 231 Tray-up sensor Disconnect the connector and release the latch to take off the tray-up sensor. Disconnect the connector and release the latch to take off the empty sensor. Fig.10-37 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 19...
  • Page 232 Remove 1 screw and take off the separation roller holder. Separation roller holder Fig.10-39 Detach the lever from the holder and take off the separation roller with the shaft. Lever Separation roller Holder Fig.10-40 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 20...
  • Page 233 Take off the drawer feeding unit ( P.10-19 "[B-1] Drawer feeding unit"). Pickup roller assembly Remove the pickup roller assembly from the pickup arms and take off the belt. Belt Fig.10-43 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 21 05/08...
  • Page 234 Remove 2 screws and take off the clutch bracket and bushing. Note: Match the protruding portion of clutch with the position shown in the figure for assem- Bushing bling Clutch bracket Fig.10-46 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 22...
  • Page 235 Remove the upper and lower drawers. Take off the filter bracket P.2-41 "[K] FIL board (FIL)"). Disconnect 1 connector. Remove 4 screws and take off the tray drive unit. Tray drive unit Fig.10-49 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 23...
  • Page 236 Coupling Fig.10-50 Take off the tray-up motor. Tray-up motor Fig.10-51 Note: Match the boss of the gear with the hole of the cover when installing the motor. Fig.10-52 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 24...
  • Page 237 2. When the clutch is being installed, be Harness sure that the stoppers of the clutch and holder harness holder are placed at the right positions. Lower transport clutch ( High speed ) Fig.10-55 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 25 05/08...
  • Page 238 2. When the clutch is being installed, be sure that the stoppers of the clutch and harness holder are placed at the right positions. Harness holder Connector Fig.10-58 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 26 05/08...
  • Page 239 P.14-16 "[J] 2nd transfer unit"). Remove 1 screw and take off the gear cover. Gear cover Fig.10-60 Open the side cover. Remove 6 screws and take off the stay. Stay Fig.10-61 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 27 05/08...
  • Page 240 Take off the paper feed guide assembly ( P.10-27 "[F] Paper feed guide assembly"). Remove 3 screws and take off the registra- tion guide while lifting it up. Registration guide Fig.10-64 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 28...
  • Page 241 Remove 1 screw and take off the bracket. Remove the sticker and disconnect 1 con- nector. Release 2 latches and take off the upper drawer feed sensor. Upper drawer feed sensor Fig.10-67 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 29...
  • Page 242 Take off the registration guide ( P.10-28 "[G] Registration guide"). Remove 2 screws and take off the bracket. Bracket Fig.10-69 Remove 1 screw and take off the cover. Cover Fig.10-70 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 30...
  • Page 243 Registration roller ( metal roller ) Fig.10-72 [M] Intermediate guide (Paper dust removal brush) Loosen 1 screw and take off the intermediate guide by sliding to the rear side. Intermediate guide Fig.10-73 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM 10 - 31 05/08...
  • Page 244 1. When the intermediate guide is being installed, be sure that the guide is not get- ting on the boss A. 2. Hook the center latch of the intermediate guide securely. Fig.10-74 e-STUDIO281c/351c/451c PAPER FEEDING SYSTEM June 2005 © TOSHIBA TEC 10 - 32 05/08...

  • Page 245: Drum Related Section

    Drum cleaner brush Toner bag full detection sensor Toner recovery auger Cleaning blade Discharge LED Drum Main charger Automatic wire cleaning drive unit Ozone exhaust duct Drum thermistor Fig.11-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 1...

  • Page 246: Construction

    Toner bag full detection sensor (S20) High-voltage transformer Image quality sensor (S17) Chapter 15 Note: Drum cleaner unit is the process unit with the transfer belt unit removed. e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 2...

  • Page 247: Functions

    When the sensor is in trouble, “Toner bag full” is determined instead of “Call for service”. If “Toner bag full” status is not cleared, the sensor, harnesses and LGC board need to be checked. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 3...
  • Page 248 9) Temperature/humidity sensor (S19) This sensor measures the environment inside the equipment. The values of the temperature and humidity detected inside the equipment are output to the LGC board. e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 4...

  • Page 249: Output Control Circuits Of High-Voltage Transformer

    Black and color developer ( DC ) ON KDVAON Black developer ( AC ) ON CDVAON Color developer ( AC ) ON ECON Cleaning blade ON Gate array TC1IV 1st transfer constant voltage/current switch Fig.11-2 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 5...

  • Page 250: Drum Temperature Detection Circuit

    2) Configuration of the drum temperature detection circuit LGC board +5.1V Engine CPU Drum thermistor DRTMP Fig.11-3 e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 6...

  • Page 251: Temperature/Humidity Sensor (S19)

    Temperature/humidity control circuit is configured as follows: LGC board +5.1V +5.1V Temperature/ Gate array ALSW02 humidity sensor TEMPS-1 ( Temp ) TEMPS-1/ HUMIS-1 Engine Analog switch HUMIS-1 ( Hum ) Fig.11-4 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 7...

  • Page 252: Construction

    This switch detects whether the wire cleaner has reached to the rear position or not. When this switch is turned ON, the charger cleaner motor (M13) rotates normally. Then the wire cleaner shifts to the front position (home position). e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 8...

  • Page 253: Drive Circuit

    Charger wire cleaner is at the rear Charger wire cleaner is at the posi- Charger wire cleaner rear posi- position tion other than the rear position tion detection signal June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 9...

  • Page 254: Disassembly And Replacement

    Take off the black developer unit cover. Black developer unit cover Fig.11-7 Open the toner cartridge holder. Then Center inner cover remove 2 screws and take off the center inner cover. Screw Screw Fig.11-8 e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 10...
  • Page 255 Disconnect 3 connectors and remove 2 Connector Screw screws. Connector Fig.11-10 Loosen 2 screws and take off the process unit by pulling it toward you. Process unit Fig.11-11 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 11 06/07...
  • Page 256 2. Push all of the 3 transfer belt drive cou- plings on the rear frame to the inside, and check if they have slid back to their original position. Fig.11-14 e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 12 06/07...
  • Page 257 Remove 1 screw on the front side and 1 screw on the rear side. Then loosen 1 screw on the front side and disconnect 1 connector. Fig.11-17 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 13 06/07...
  • Page 258 Transfer belt unit Screw Fig.11-18 Loosen 1 screw and take off the drum stay. Drum stay Fig.11-19 Remove 2 screws and take off the bushing of the drum. Bushing Fig.11-20 e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 14...
  • Page 259 When the main charger unit is being Gear installed, rotate the gear counterclockwise for 1 round or more and install it while the holder arm is being pulled completely inside. Holder arm Fig.11-23 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 15...
  • Page 260 1. Insert the each edge of the wire securely into each V-groove on both front and rear sides. 2. Do not twist the wire. 3. Do not touch the wire directly with bare hands. Fig.11-26 e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 16...
  • Page 261 It is recommended to mark off the position of each before they are taken off. Fig.11-29 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 17...
  • Page 262 Drum cleaning brush Take off the drum cleaning blade P.11-18 "[H] Drum cleaning blade"). Rotate the lever to unlock it, and then pull out the lever. Lever Fig.11-32 e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 18...
  • Page 263 Connector tor. Then take off the drum thermistor with its bracket. Drum thermistor Fig.11-34 Remove 1 screw and take off the drum ther- mistor. Screw Drum thermistor Fig.11-35 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 19...
  • Page 264 Discharge LED Fig.11-37 [M] Charger cleaner motor (M13) Disconnect 2 connectors and remove 1 screw. Then take off the charger cleaner motor unit. Charger cleaner motor unit Fig.11-38 e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 20...
  • Page 265 [N] Charger cleaner position detection switch (S25/S26) Take off the discharge LED unit P.11-20 "[L] Discharge LED (ERS)"). Remove 1 screw and separate the discharge LED unit into 2 sections. Fig.11-41 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 21...
  • Page 266 P.11-10 "[B] Process unit"). Toner bag full detection sensor Disconnect 1 connector and remove 1 screw. Then take off the toner bag full detection sensor with its bracket. Fig.11-44 e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 22...
  • Page 267 Then take off the temperature/ Temperature/Humidity sensor humidity sensor. Latch Fig.11-46 [Q] Ozone filter Remove 1 screw and take off the cover. Take off the ozone filter. Ozone filter Screw Cover Fig.11-47 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DRUM RELATED SECTION 11 - 23...
  • Page 268 Then take off the ozone exhaust fan with its duct. (10) Release 6 latches and take off the duct. Then take out the ozone exhaust fan. Ozone exhaust fan Fig.11-49 e-STUDIO281c/351c/451c DRUM RELATED SECTION June 2005 © TOSHIBA TEC 11 - 24...

  • Page 269: General Description

    Chapter 9 in this manual describes more. Mixer Color auto-toner sensor Drum Developer sleeve Color developer unit Developer sleeve Black developer unit Mixer Black auto-toner sensor Fig.12-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 1...

  • Page 270: Construction

    Color auto-toner sensor (S10) Color auto-toner sensor shutter solenoid (SOL1) Color developer drive section Chapter 9 Color developer toner supply clutch (CLT8) Chapter 9 Color developer drive clutch (CLT9) Chapter 9 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 2...

  • Page 271: Black Toner Cartridge Drive Unit

    Toner motor +5.1V KTNDET KTNDET Black toner cartridge switch Fig.12-2 Signal level for motor circuit Signal State KTNA1A KTNA1B CW (when supplying toner) CCW (detecting cartridge installation) Brake June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 3...

  • Page 272: Functions

    The magnetic bridge circuit in the black auto-toner sensor (S13) detects the toner ratio in the developer material. This sensor supplies the toner from the toner cartridge. e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 4...

  • Page 273: Black Developer Unit Drive Section

    ON and disconnected when it is OFF. Gear ( G21 ) Gear ( G20 ) Gear ( G19 ) Gear ( G19 ) Gear ( G20 ) Fig.12-4 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 5...

  • Page 274: Black Auto-Toner Sensor Circuit

    Drives toner motor. → Supplies toner from the toner cartridge. → Output of the auto-toner sensor changes. → Toner density recovers to its normal value. → “Toner-empty” is cleared. e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 6...
  • Page 275 When the toner density is high: Toner ratio to the carrier in the developer material increases. → Magnetic resistance increases. → Detection output decreases. → Auto-toner output V decreases. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 7...

  • Page 276: Black Developer Unit Lifting Mechanism

    “L” is output when contacting. The sensor controls the power supply to turn OFF the clutch after detecting the output alteration (“L” to “H” or “H” to “L”). e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 8...

  • Page 277: Color Developer Unit

    The color toner cartridge and the color developer units are fitting each other to prevent misinstalla- tion of the color toner cartridge. Therefore, the revolver unit has no device preventing misinstallation. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 9...

  • Page 278: Color Developer Unit Drive Section

    ON and disconnected when it is OFF. The transmitted drive operates the mixers. Gear ( G21 ) Coupling ( G20 ) Gear ( G19 ) Gear ( G18 ) Gear ( G19/G27 ) Gear ( G27 ) Fig.12-8 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 10...

  • Page 279: Color Auto-Toner Sensor Circuit

    Toner density signal A/D converter Color auto-toner sensor Color auto-toner sensor shutter solenoid Control voltage signal Gate array converter Shutter driving signal Color developer unit Color toner cartridge Fig.12-9 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 11...
  • Page 280 → Detection output (voltage) decreases. When the toner density is high: Toner ratio to the carrier in the developer material increases. → The light reflection amount increases. → Detection output (voltage) increases. e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 12...

  • Page 281: Color Toner Supply

    If the toner density is still lower than the regulated value, it is judged as “toner empty” and the unit moves to the escape position. 5) Procedure 1 to 4 is repeated for other color developer units when the toner supply is needed. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 13...

  • Page 282: High-Voltage Transformer Output Control Circuit

    The developer bias transformer generates output voltage proportional to the control voltage Vc by ON signed. * Adjustment of the control voltage Vc (change of adjustment data) is performed in the adjustment mode. e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 14...

  • Page 283: Disassembly And Replacement

    Black developer unit cover Fig.12-11 Disconnect 2 connectors. Fig.12-12 Remove 1 screw and pull out the black developer unit. Black developer unit Fig.12-13 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 15...
  • Page 284 Take off the black developer unit P.12-15 "[A-1] Black developer unit"). Remove 2 screws and take off the upper cover. Upper cover Fig.12-14 Discharge the developer material. Fig.12-15 Pour the developer material. Fig.12-16 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 16...
  • Page 285 Fig.12-18 [A-4] Doctor blade Discharge the developer material P.12-16 "[A-2] Developer material"). Right cover Remove 2 screws, release 1 hook and take off the right cover. Fig.12-19 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 17...
  • Page 286 Then match the polarity adjustment plate at the scale previously recorded when reassembling. Remove 1 screw and take off the bracket. Screw Polarity adjustment plate Fig.12-22 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 18...
  • Page 287 Rear side: Remove the following parts installed on the shaft of the developer sleeve in order: E-ring, bushing, collar, roller (bear- ing-1), E-ring, gear, pin, bearing-2 and oil seal. Fig.12-25 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 19...
  • Page 288 Rear side: Remove the following parts installed on the shaft of each mixer in order: E-ring, gear, bearing and oil seal. * Procedure for replacing an oil seal: E-ring P.12-32 "Fig.12-63 " Gear Fig.12-28 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 20...
  • Page 289 03-454: Cyan toner cartridge moves to the replacement position. Fig.12-30 Open the front cover and take off the color toner cartridge while pressing the lever. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 21...
  • Page 290 (4) to (6). When rotating the revolver manually, push down the revolver lock lever and rotate the revolver slightly, and then pull up the lever again. Color developer unit Fig.12-33 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 22...
  • Page 291 2. When installing the toner holder, rotate the holder with hooking the magnet roller side of it. Fig.12-35 3. When installing the toner holder, be care- ful not to peel the seal. Fig.12-36 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 23...
  • Page 292 Doctor blade Discharge the developer material P.12-23 "[B-2] Developer material"). Remove the urethane seal. Urethan seal Remove 2 screws and take off the doctor blade. Screw Doctor blade Screw Fig.12-39 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 24...
  • Page 293 C-ring, E-ring, bearing-2 and oil seal. * Procedure for replacing an oil seal: P.12-32 "Fig.12-63 " Fig.12-41 Rear side: Remove 1 screw and take off the gear assembly. Gear assembly Screw Fig.12-42 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 25...
  • Page 294 P.12-25 "[B-4] Developer sleeve"). Front side: Remove the following parts in order: E-ring, bushing-1 and bushing-2. * Procedure for replacing an oil seal: E-ring E-ring P.12-32 "Fig.12-63 " Bushing-1 Fig.12-45 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 26...
  • Page 295 The springs on both front and rear sides dif- fer in the active coils (length of spring). When installing, pay attention to its active coils (length of spring). Front side: 20 (longer) Rear side: 18 (shorter) Fig.12-48 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 27...
  • Page 296 P.11-20 "[L] Discharge LED (ERS)"). Take off the laser optical unit P.8-11 "[A] Laser optical unit"). Take off the black toner cartridge. Remove 1 screw and take off the toner case. Screw Fig.12-51 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 28...
  • Page 297 Black toner supply unit catch. Fig.12-53 Remove 1 screw and take off the black toner cartridge switch with the whole bracket. Black toner cartridge switch Fig.12-54 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 29...
  • Page 298 Remove 1 screw and take off the rail. Rail Fig.12-56 Remove 2 screws and take off the black toner supply auger unit. Screw Black toner supply auger unit Fig.12-57 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 30...
  • Page 299 Disconnect 1 connector, remove 2 screws and take off the color auto-toner sensor shut- ter solenoid. Shutter solenoid Fig.12-59 Remove 2 screws and 1 spring and take off the stay. Spring Stay Fig.12-60 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c DEVELOPER UNIT 12 - 31...
  • Page 300 Spread the grease (Alvania No.2; about 2- ricegrain’s amount) all around the inside Grease diameter. Note: Wipe off the grease which has run off to the inner side of the oil seal. Oil seal Fig.12-63 e-STUDIO281c/351c/451c DEVELOPER UNIT June 2005 © TOSHIBA TEC 12 - 32...

  • Page 301: Revolver Unit

    Color auto-toner sensor Revolver motor Color toner cartridge sensor Photoconductive drum Revolver home position sensor Revolver unit Fig.13-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c REVOLVER UNIT 13 - 1...

  • Page 302: Construction

    P.12-9 "12.5 Color Developer Unit") and Chapter 9 for the developer motor drive unit ( P.9-6 "9.4 Developer Motor (M11)"). • Revolver unit • Revolver motor • Revolver home position sensor • Color toner cartridge sensor e-STUDIO281c/351c/451c REVOLVER UNIT June 2005 © TOSHIBA TEC 13 - 2...

  • Page 303: Functions

    This sensor is a transmissive type light sensor detecting the revolver unit home position. The posi- tion detection is performed at initialization. "Call for service" if it does not detect the position in a specified period of time. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c REVOLVER UNIT 13 - 3...

  • Page 304: Drive Of Revolver Unit

    The drive from the revolver motor (M12) is transmitted to the gear at the external layer of the revolver unit rear side. Then the revolver unit rotates clockwise. Revolver motor ( G15 ) Revolver unit ( G135 ) Revolver home position sensor Fig.13-2 e-STUDIO281c/351c/451c REVOLVER UNIT June 2005 © TOSHIBA TEC 13 - 4...

  • Page 305: Revolver Motor Drive Circuit

    Motor +24V driver RVMPHA-0 GATE1 RVMA RVMPHC-0 Engine GATE2 RVMC RVMB +24V RVMD +5VSW RVMPHB-0 GATE1 RVMBHD-0 Revolver motor RVMC3-0 RVMC1-0 GATE2 Motor driver Gate array RVMC2-0 RVMC1-0 Fig.13-3 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c REVOLVER UNIT 13 - 5...

  • Page 306: Operation

    9) The revolver unit moves to the escape position to perform black image development after the com- pletion of yellow image development. e-STUDIO281c/351c/451c REVOLVER UNIT June 2005 © TOSHIBA TEC 13 - 6...

  • Page 307: Color Toner Supply

    6) The image quality sensor (S17) reads the image density of four colors and feedbacks to the image quality control. 7) Procedure 1 to 7 is repeated for one to six times until the specified gradation characteristic and image density are obtained. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c REVOLVER UNIT 13 - 7 05/08...

  • Page 308: Disassembly And Replacement

    Take off the inner tray ( P.2-26 "[C] Inner tray"). Disconnect 1 connector and remove 2 screws. Then take off the internal cooling fan together with the duct. Duct Fig.13-6 e-STUDIO281c/351c/451c REVOLVER UNIT June 2005 © TOSHIBA TEC 13 - 8...
  • Page 309 [D] Revolver motor (M12) Take off the LGC board case ( P.2-38 "[F] LGC board case"). Disconnect 1 connector and remove 2 screws and take off the revolver motor. Revolver motor Fig.13-9 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c REVOLVER UNIT 13 - 9...
  • Page 310 1. When installing, insert the shaft of the holder into the revolver unit securely. 2. Apply the grease to the shaft after the replacement of the gears. Grease Grease Fig.13-11 e-STUDIO281c/351c/451c REVOLVER UNIT June 2005 © TOSHIBA TEC 13 - 10 06/07...
  • Page 311 (rear side). (11) Pull out the handle. Remove 2 screws and take off the laser cooling duct cover (front side). Laser cooling duct cover (front side) Fig.13-13 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c REVOLVER UNIT 13 - 11...
  • Page 312 (13) Remove 4 screws and take off the stay. (Remove 1 of 4 screws from the rear side of the equipment.) Stay Fig.13-15 (14) Remove 3 screws and take off the bracket. Bracket Fig.13-16 e-STUDIO281c/351c/451c REVOLVER UNIT June 2005 © TOSHIBA TEC 13 - 12...
  • Page 313 (16) Push in the bearing to the inside of the frame Stopper and come it off from the frame. Bearing Fig.13-17 (17) Slide the revolver unit to the front and take off the revolver unit. Revolver unit Fig.13-18 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c REVOLVER UNIT 13 - 13...
  • Page 314 REVOLVER UNIT June 2005 © TOSHIBA TEC 13 - 14...

  • Page 315: Transfer Unit

    Transfer belt cleaning blade Transfer belt Used toner auger Idling roller Drum stay Transfer belt home position sensor-1 Drum 2nd transfer guide roller 2nd transfer roller position detection sensor Fig.14-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT 14 - 1...

  • Page 316: Construction

    Transfer belt cleaner auger motor (M2) Transfer belt cleaner clutch (CLT1) 2nd transfer unit 2nd transfer roller PM parts 2nd transfer roller contact clutch (CLT5) 2nd transfer roller position detection sensor (S18) e-STUDIO281c/351c/451c TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 2...

  • Page 317: Functions

    OFF. Since the transport motor is its drive source, the clutch needs to be ON as long as they are contacting. It also controls the clutch not to turn more than 180 degrees by the spring and stopper. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT 14 - 3...
  • Page 318 13)2nd transfer roller position detection sensor (S18) This sensor is a photointerrupter detecting whether the 2nd transfer roller is at its contacting position or releasing position. e-STUDIO281c/351c/451c TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 4...

  • Page 319: Outline Of 1St Transfer

    3) When the transfer of the toner image from the transfer belt to the paper is completed in 2nd transfer, residual toner on the transfer belt is scraped off by the transfer belt cleaning blade. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT...

  • Page 320: Outline Of 2Nd Transfer

    3) After an electrode bias is applied on the 2nd transfer roller, the toner image is transferred from the transfer belt to the paper. 4) Upon the completion of 2nd transfer, the 2nd transfer roller escapes to the releasing position. e-STUDIO281c/351c/451c TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 6...

  • Page 321: High-Voltage Transformer Output Control Circuit

    The toner on the transfer belt is eliminated by the cleaning unit and thus cleaning of the 2nd transfer roller is performed. 2nd transfer roller Engine TC2VR converter Gate array High-voltage transformer NVRAM +1000V, -1000V TC2ON Fig.14-2 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT 14 - 7...

  • Page 322: Disassembly And Replacement

    Disconnect 1 connector on the rear side. Fig.14-4 Take off the transfer belt. Note: Transfer belt unit When the transfer belt unit is being installed, screw the unit by pressing it downward. Fig.14-5 e-STUDIO281c/351c/451c TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 8 05/08...
  • Page 323 Fig.14-6 Remove 2 springs. Note: Spring Make sure that the spring is not installed incorrectly or deformed. Spring Fig.14-7 Remove 1 screw and take off the bracket. Bracket Fig.14-8 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT 14 - 9...
  • Page 324 Remove 1 screw and take off the right rail. Fig.14-10 Remove 1 screw on the front side and 1 screw on the rear side. Then lay down the Screw tension roller. Screw Tension roller Fig.14-11 e-STUDIO281c/351c/451c TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 10...
  • Page 325 2nd transfer guide roller with alcohol. 6. Check if the flange on both ends of the Fig.14-14 transfer belt does not run on the rollers. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT 14 - 11...
  • Page 326 Remove 1 screw and take off the cover. Cover Fig.14-16 Disconnect 1 connector and remove 1 screw. Then take off the transfer belt home position Transfer belt sensor-1. home position sensor-1 Fig.14-17 e-STUDIO281c/351c/451c TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 12...
  • Page 327 Transfer belt sensor-2. home position sensor-2 Fig.14-19 Drum stay Take off the process unit P.11-10 "[B] Process unit"). Loosen 1 screw and take off the drum stay. Drum stay Fig.14-20 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT 14 - 13...
  • Page 328 2. Be sure that the attached blade mylars come at the bottom side of the recovery blade and the blade sheet. Blade mylar Blade sheet Blade mylar Fig.14-23 e-STUDIO281c/351c/451c TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 14 05/08...
  • Page 329 2nd transfer roller. Remove 1 clip and slide 1 bushing (with bearing) on the rear side of the 2nd transfer roller. Take off the 2nd transfer roller. Fig.14-26 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT 14 - 15...
  • Page 330 Open the 2nd transfer unit. Disconnect 1 connector and release the har- ness clamp. Remove 3 screws and take off the 2nd trans- fer gear unit. Gear unit Fig.14-29 e-STUDIO281c/351c/451c TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 16...
  • Page 331 Remove 2 screws and take off the pre-trans- fer guide. Fig.14-31 Note: When the pre-transfer guide is being installed, be sure that 3 tabs of the guide come underneath the bracket (metal plate). Fig.14-32 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT 14 - 17 05/08...
  • Page 332 If the partial gear is incorrectly installed in a 180-degree reversed position, an operation abnormality (CEC0: 2nd trans- fer belt position detection abnormality) may occur. Partial gear Fig.14-35 e-STUDIO281c/351c/451c TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 18...
  • Page 333 Disconnect the connector. Remove 1 clip Clip and slide the bushing to the rear side. Bushing Fig.14-37 Take off the transfer belt cleaner clutch. Transfer belt cleaner clutch Fig.14-38 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c TRANSFER UNIT 14 - 19...
  • Page 334 TRANSFER UNIT June 2005 © TOSHIBA TEC 14 - 20...

  • Page 335: Image Quality Control

    In addition, a shutter operated by the solenoid is equipped on the light receiving/emitting surfaces to prevent stain to the sensor and to calibrate the sensor with the reflection from the shutter. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c IMAGE QUALITY CONTROL...

  • Page 336: Principle Of The Sensor

    Transfer belt Test pattern (toner image) Light emitting Light receiving element element Reflected light amount signal Reflected light amount voltage Light source amount voltage Light source amount signal Fig.15-1 e-STUDIO281c/351c/451c IMAGE QUALITY CONTROL June 2005 © TOSHIBA TEC 15 - 2...

  • Page 337: Flow Chart Of Control Procedure

    The image forming conditions are determined and stored in NVRAM. [ 10 ] Control procedure is completed. ( The determined image forming conditions will be reflected on subsequent prints. ) June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c IMAGE QUALITY CONTROL 15 - 3...

  • Page 338: Construction

    Performs steps [1] to [10] described previously. Image forming process Transfer belt Image quality sensor Laser optical system Various image forming conditions Light source Reflected light amount signal amount signal Fig.15-2 e-STUDIO281c/351c/451c IMAGE QUALITY CONTROL June 2005 © TOSHIBA TEC 15 - 4...

  • Page 339: Disassembly And Replacement

    Image quality sensor Fig.15-4 Remove 2 screws and take off the image quality sensor shutter solenoid. Image quality sensor shutter solenoid Fig.15-5 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c IMAGE QUALITY CONTROL 15 - 5...
  • Page 340 IMAGE QUALITY CONTROL June 2005 © TOSHIBA TEC 15 - 6...

  • Page 341: Fuser Unit / Paper Exit Section

    Exit roller Exit sensor Fuser belt Separation plate Cleaning roller Oil roller Discharge brush Thermostat Separation finger Thermistor Fuser roller IH coil Pressure roller Fig.16-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 1 05/08...

  • Page 342: Construction

    Thermistor (THM1, 2, 3) Thermostat (THMO1) Exit roller Exit sensor (S40) Exit motor (M7) IH control PC board (IH) IH control board cooling fan (M17) e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 2...

  • Page 343: Functions

    (preventing offsetting phenomenon). Also, the cleaning roller is a metal roller which removes the residual toner and paper dust adhered on the oil roller. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 3...
  • Page 344 ADU and is driven by the exit motor (M7). 15)Discharge brush It is installed with the pressure roller contacting it in order to keep the surface potential on the roller even. e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 4...

  • Page 345: Operation

    1/2 to 1/3 in order to improve fusing efficiency. The exit motor (M7) which drives the exit roller is decelerated at the same time. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 5...

  • Page 346: Heater Control Circuit

    IH2 ON signal +5VSW Control circuit including CPU Photocoupler Temperature control circuit IH board AC line DC line 250°C upper limit circuit LGC board Fig.16-2 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 6...

  • Page 347: Heating Principle Of Ih Heater

    Smoothing circuit IGBT drive ( IGBT ) IGBT drive Current input Monitoring input current Voltage input I/F circuit on LGC board Monitoring input current Fig.16-4 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 7...

  • Page 348: Ih Control Circuit Interface

    IH status signal IH to LGC P.16-10 "16.5.5 Abnormality in the IH con- CN456-5 H1ERR2 trol circuit") CN456-2 LGC to IH CN456-3 IHDUTY Duty ratio changing signal e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 8...

  • Page 349: Relation Between System Configuration And Ih Output

    (*2) AC power should be input voltage when the equipment is warming up (The lower the voltage is, the longer the warming up time becomes). June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 9...

  • Page 350: Abnormality In The Ih Control Circuit

    CPU output level of the IH control circuit changes depending on the condition of IH coil. This output level goes through the photocoupler into the gate array. IH board LGC board +5VSW H1ERR1 Gate array H1ERR2 Fig.16-5 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 10...
  • Page 351 Power voltage abnormality C475 access cover is (Other than the above) when the cover is opened opened An abnormal status is detected when the cover is opened June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 11...

  • Page 352: Temperature Detection Section

    The temperature of the ends are detected by the front edge thermistor, and when it reaches 250°C, the heater is automatically turned OFF regardless of the temperature of the area where the paper passes on. e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 12...
  • Page 353 100°C. Auto Shut Off Mode (Setting Mode (08-206)): When the printing is not performed in a specified period of time (default setting: e-STUDIO281c/ 351c: 60 min. / e-STUDIO451c: 90 min.) after the equipment entered to Auto Power Save Mode, the equipment then enters to Auto Shut Off Mode to turn OFF the IH coil.
  • Page 354 OFF again. After confirming that it is the fuser unit abnormality, correct the abnormality and reset the counter value (08-400) to "0" to start up the equipment normally. e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 14...
  • Page 355 OFF the power when the temperature of IH coil exceeds the specified temperature. +5.1 V thermistor STHU-1A +5.1 V Main thermistor THMU-1A Engine CPU +5.1 V Front edge thermistor SSTH-1A Fig.16-8 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 15...
  • Page 356 40°C or below C447 40°C or below 40°C or below At energy 250°C or above C449 On usual saving mode 250°C or above 250°C or above e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 16...
  • Page 357 When a temperature detected by the equipment is low (16°C or below) the pre-running end temperature set at 08-422 will be applied, and in all other cases, the temperature set at 08-411 will be applied. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 17...

  • Page 358: Control Circuit Of Exit Motor

    DRV board +5.1V EXTMA-0 EXTMA EXTMC-0 EXTMC Engine EXTMB-0 EXTMB EXTMD-0 EXTMD +5VSW Motor driver Exit motor EXTC3-0 EXTC1-0 VREF EXTC2-0 Gate array EXTC1-0 Fig.16-9 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 18...

  • Page 359: Disassembly And Replacement

    Oil roller Take off the fuser unit P.16-19 "[A] Fuser unit"). Open the jam access cover and transport Transport guide guide. Jam access cover Fig.16-12 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 19...
  • Page 360 Take off the oil roller. Spring ( A ) Oil roller Fig.16-14 Remove 1 bushing from each side of the oil roller. Bushing Oil roller Bushing Fig.16-15 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 20...
  • Page 361 Bushing Fig.16-17 Remove 1 E-ring, the gear (C) and 1 bushing from the cleaning roller rear side. Bushing Gear ( C ) E-ring Fig.16-18 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 21...
  • Page 362 IH coil. 3. Make sure that there is not any peeling or scratch on the harness tube. IH coil Fig.16-21 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 22...
  • Page 363 Push down the pressure releasing levers on both sides. Remove 1 C-ring and 2 gears. Gear Pressure releasing lever Fig.16-23 Remove 1 bearing. Bearing Fig.16-24 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 23...
  • Page 364 Also, make sure that the ring on the fuser belt guide securely fits in the groove on the belt restricting plate. Fuser roller C-ring Fuser belt guide Bearing Fig.16-27 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 24...
  • Page 365 Remove 1 screw and take off the bracket on the front side. Screw Bracket Fig.16-29 Remove 1 screw and take off the bracket on the rear side. Bracket Screw Fig.16-30 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 25...
  • Page 366 Peper from being scratched by the separation plate. Keep the paper between then until the fuser roller is installed. Fig.16-33 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 26...
  • Page 367 Then loosen each 1 screw on both front and rear sides. Screw Pressure releasing lever Pressure releasing lever Fig.16-35 Remove 2 springs. Fig.16-36 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 27...
  • Page 368 Take off the fuser belt unit P.16-25 "[F] Fuser belt"). Take off the separation finger unit P.16-27 "[G] Separation finger"). Take off the pressure roller. Pressure roller Fig.16-39 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 28...
  • Page 369 Remove 2 screws and take off the thermo- Screw stat unit. Note: Fuser belt Be careful not to scratch the fuser belt. Thermostat unit Fig.16-42 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 29...
  • Page 370 Take off the fuser unit P.16-19 "[A] Fuser unit"). Remove 2 screws and take off the fuser unit entrance guide. Fuser unit entrance guide Fig.16-45 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 30...
  • Page 371 Fig.16-47 Remove 1 screw and bracket. Disconnect 1 connector and take off the exit Exit sensor Spring sensor. Remove 1 spring. Connector Screw Bracket Fig.16-48 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 31...
  • Page 372 Open the jam access cover of the fuser unit. Remove 2 screws (one of the front side is a shoulder screw) and take off the exit roller Exit roller cover cover. Fig.16-51 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 32...
  • Page 373 [M] Discharge brush Take off the fuser unit P.16-19 "[A] Fuser unit"). Remove 2 screws and take off the jam access cover. Jam access cover Fig.16-54 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 33...
  • Page 374 Disconnect 2 connectors and 4 faston termi- Screw nal ( P.16-19 "[A] Fuser unit"). Remove 3 screws and take off the IH board cover. IH board cover Fig.16-57 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 34...
  • Page 375 P.16-34 "[N] IH board (IH) / IH board IH control board cooling fan cover case"). Remove 1 screw and take off the IH control Screw board cooling fan cover. Fig.16-60 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION 16 - 35...
  • Page 376 When the exit motor is being installed, install it by sliding the motor to the left side to nar- row the distance between the shafts of the gear. Fig.16-63 e-STUDIO281c/351c/451c FUSER UNIT / PAPER EXIT SECTION June 2005 © TOSHIBA TEC 16 - 36 05/08...

  • Page 377: Automatic Duplexing Unit (Adu)

    / exit sensor. Upper transport roller Entrance guide ADU motor ADU entrance sensor Paper guide ADU clutch Middle transport roller ADU exit sensor Exit guide Lower transport roller Fig.17-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 1...

  • Page 378: Construction

    ADU clutch (CLT7) ADU entrance sensor (S38) ADU exit sensor (S39) ADU opening/closing switch (S37) ADU driving PC board (ADU) Upper transport roller Middle transport roller Lower transport roller e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 2...

  • Page 379: Functions

    This switch detects whether the ADU is open or not. 6) Upper transport roller / Middle transport roller / Lower transport roller This roller transports paper into the ADU. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 3...

  • Page 380: Drive Of Adu

    The ADU clutch (CLT7) is then turned ON and the middle transport roller and lower transport roller are rotated. ADU motor Upper transport roller ADU clutch Middle transport roller Lower transport roller Fig.17-2 e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 4...

  • Page 381: Description Of Operations

    The operation of the duplex printing differs depending on the size of the paper; single-paper circulation and alternateness circulation. The figures in the following pages show the circulating operations during duplex copying. The numbers in the figures indicate the page numbers. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 5...
  • Page 382 1) Single-paper circulation With the paper larger than A4/LT size, duplex printing (back-side printing→front-side printing) is per- formed for one sheet at a time as shown below. Fig.17-3 e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 6...
  • Page 383 With A4/LT size paper or smaller, duplex printing is performed for two sheets at a time as shown below. Back side of the 1st sheet→Back side of the 2nd sheet→Front side of the 1st sheet→Front side of the 2nd sheet Fig.17-4 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 7...
  • Page 384 Front side of the 3rd sheet (5) → Back side of the 5th sheet (10) → Front side of the 4th sheet (7) → Front side of the 5th sheet (9) Fig.17-5 e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 8...
  • Page 385 8193 10269 Registration clutch 6980 8736 ADU entrance sensor 7344 9452 ADU exit sensor 7090 7850 8195 9634 ADU clutch 6561 7826 8198 9663 ADU motor Fig.17-7 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 9...

  • Page 386: Flow Chart

    OFF the ADU exit sensor? ADU motor stopped ADU motor ON ADU clutch ON ADU exit sensor check the arrival? ADU transport jam (E520) Specified time has passed e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 10...
  • Page 387 ADU feeding operation started Registration sensor ON? ADU misfeeding (E110) Registration proceeded Registration operation completed ADU motor stopped ADU clutch OFF Next paper is ready for the registration June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 11...

  • Page 388: Disassembly And Replacement

    Screw Screw Bracket Ground wire Fig.17-9 Open the ADU. Lift up the ADU a little and slide it to the rear side and take it off. Fig.17-10 e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 12...
  • Page 389 Take off the ADU inside rear cover. P.17-13 "[B] ADU inside rear cover") ADU board Disconnect 6 connectors from the ADU board. Release 3 lock supports and take off the ADU board. Fig.17-13 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 13...
  • Page 390 Note: When installing the E-ring, make sure that the latches of both ends of E-ring are on the flat part of the shaft. ADU clutch E-ring Fig.17-16 e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 14...
  • Page 391 ADU rear latch Fig.17-18 Disconnect 1 connector. Release the har- ness from 2 harness clamps. Remove 2 screws and take off the ADU drive unit. ADU drive unit Fig.17-19 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 15...
  • Page 392 Take off the ADU drive unit. P.17-15 "[H] ADU motor (M5) / ADU drive unit") Remove 1 E-ring on the rear side. Then take off 1 pulley. Pulley E-ring Fig.17-22 e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 16...
  • Page 393 Remove 1 E-ring, 1 clip and 1 bushing on the rear side. E-ring Bushing Take off 1 bushing on the front side. Then Middle transport roller take off the middle transport roller. Clip Bushing Fig.17-25 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 17...
  • Page 394 ADU entrance sensor (S38) Take off the ADU cover. P.17-14 "[E] ADU cover") ADU entrance sensor Disconnect 1 connector. Release the latches and take off the ADU entrance sensor. Fig.17-28 e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 18...
  • Page 395 [M] ADU exit sensor (S39) Take off the ADU cover. P.17-14 "[E] ADU cover") Disconnect 1 connector. Release the latches and take off the ADU exit sensor. ADU exit sensor Fig.17-29 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c AUTOMATIC DUPLEXING UNIT (ADU) 17 - 19...
  • Page 396 AUTOMATIC DUPLEXING UNIT (ADU) June 2005 © TOSHIBA TEC 17 - 20...

  • Page 397: Power Supply Unit

    Two kinds of voltage (+5.1VD and +24VD) are output only when the main switch of the equipment is turned ON and two covers (front cover and jam access cover) are closed. June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c POWER SUPPLY UNIT 18 - 1...

  • Page 398: Operation Of Dc Output Circuits

    If the protection circuit is activated (except the case the fuse is blown out), remove the causes such as short-circuit. Turn ON the power again 1 minute later to clear the overcurrent protection. e-STUDIO281c/351c/451c POWER SUPPLY UNIT June 2005 © TOSHIBA TEC 18 - 2...

  • Page 399: Output Channel

    Output to the SYS board +12VB: CN464 Pin 3 Output to the SYS board +12VB: CN466 Pin 16 Output to the LGC board +12VB: CN471 Pin 1 Output to the FAX unit June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c POWER SUPPLY UNIT 18 - 3...
  • Page 400 Bridge unit (via LGC board) CN466 LGC board +5.1VD CN467 SLG board, RADF +24VD3, +24VD4 CN468 Finisher +24VD5 CN469 PFP/LCF +24VD1 CN470 Power supply cooling fan +24VD1 e-STUDIO281c/351c/451c POWER SUPPLY UNIT June 2005 © TOSHIBA TEC 18 - 4...

  • Page 401: Fuse

    F4:8A (Semi time-lag) Exit motor +24VD3 RADF +24VD4 Exposure lamp (lamp inverter) F5:8A (Semi time-lag) CCD drive circuit (CCD board) Scanner unit cooling fan Scan motor +24VD5 Finisher June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c POWER SUPPLY UNIT 18 - 5...

  • Page 402: Configuration Of Power Supply Unit

    18.5 Configuration of Power Supply Unit Regulator Regulator Fig.18-1 e-STUDIO281c/351c/451c POWER SUPPLY UNIT June 2005 © TOSHIBA TEC 18 - 6...

  • Page 403: Sequence Of Power Supply

    +12VB ( Linked with main switch ) +4.95V ( R.V. +5.1V ) +11.4V ( R.V. +12V ) +24VD1 to +24VD5 ( Linked with main switch ) +21.6V ( R.V. +24V ) Fig.18-2 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c POWER SUPPLY UNIT 18 - 7...

  • Page 404: Ac Wire Harness

    18.7 AC Wire Harness Fig.18-3 e-STUDIO281c/351c/451c POWER SUPPLY UNIT June 2005 © TOSHIBA TEC 18 - 8...

  • Page 405: Pc Boards

    19. PC BOARDS 1) PWA-F-SYS Fig.19-1 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PC BOARDS 19 - 1...
  • Page 406 2) PWA-F-LGC Fig.19-2 e-STUDIO281c/351c/451c PC BOARDS June 2005 © TOSHIBA TEC 19 - 2...
  • Page 407 3) PWA-F-SLG Fig.19-3 4) PWA-F-CCD Fig.19-4 5) PWA-F-DRV Fig.19-5 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PC BOARDS 19 - 3...
  • Page 408 6) PWA-F-LDR Fig.19-6 7) PWA-F-SNS Fig.19-7 8) PWA-F-ADU Fig.19-8 e-STUDIO281c/351c/451c PC BOARDS June 2005 © TOSHIBA TEC 19 - 4...
  • Page 409 9) PWA-F-DSP Fig.19-9 10)PWA-F-KEY Fig.19-10 June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c PC BOARDS 19 - 5...
  • Page 410 11)PWA-F-FIL Fig.19-11 e-STUDIO281c/351c/451c PC BOARDS June 2005 © TOSHIBA TEC 19 - 6...

This manual is also suitable for:

E-studio351cE-studio451c

Table of Contents