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Service Manual
[ 1 ] PRODUCT OUTLINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
[ 2 ] PRODUCT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
[ 3 ] OPTION SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
[ 4 ] PAPER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
[ 5 ] COMPONENT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
[ 6 ] PROCESS SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
[ 7 ] DEVELOPING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
[ 8 ] PAPER FEED SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
[ 9 ] TRANSPORT/FUSING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
[10] HIGH VOLTAGE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
[11] OPTICAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
[12] ADU UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
[13] ELECTRICAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1
Parts marked with "!" is important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.
SERVICE MANUAL
MODEL
MODEL
CONTENTS
SHARP CORPORATION
CODE: 00ZSF2050TM/E
No.2
SF-2050
SF-C52
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
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Table of Contents
Related Manuals for Sharp SF-2050
Summary of Contents for Sharp SF-2050
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Page 1: Table Of Contents
SERVICE MANUAL CODE: 00ZSF2050TM/E No.2 SF-2050 MODEL SF-C52 MODEL CONTENTS [ 1 ] PRODUCT OUTLINE ........1-1 [ 2 ] PRODUCT SPECIFICATIONS . - Page 2 CONTENTS [ 1 ] PRODUCT OUTLINE ............... . 1-1 General description .
- Page 3 [ 4 ] PROCESS (Photocondor drum and cleaning unit) ........4-1 Basic theory .
- Page 4 (10) Mirror base C ................9-2 (11) Mirror base C (No.
- Page 5 (6) Control circuit ................10-29 (7) Overcurrent protection circuit .
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Page 6: General Description
[1] GENERAL DESCRIPTION (SF-S16) (SF-S53) 1. The SF-2050 is a high speed copier which allows copying of 50 sheets per minute, and first copy at the at the highest speed in the class with remarkable copying efficiency. 2. Target users 20,000 ∼... -
Page 7: Basic Specification
(8) Copy magnification ratio [2] PRODUCT SPECIFICATIONS AB series: 4R+4E: 200, 141, 122, 115, Fixed 100, 86, 81, 70, 50 % magnification Inch series: 4R+4E: 200, 141, 129, 121, 1. Basic specifications ratio 100, 95, 77, 64, 50 % 50 ∼ 200% (151 steps in 1% increment) Zoom range (1) Type: Console... -
Page 8: Light Source
(11) Developing system: Dry, two-component magnetic brush (22) Power source Voltage: 100V, 110V, 120V, 127V, 220 ∼ 230V, development 200V, 220V, 240V (12) Charging system: (–) DC saw teeth electrode system Frequency: 50/60 Hz common (13) Transfer system: (–) DC corotron system (23) Power consumption Max. - Page 9 2. Supply parts Name Content Life Product name Packing × 1 Drum OPC drum 200K SF-250DR × 10 100K × 10 Developer (Black) Developer (1.0kg) SD-360MD × 10 28K × 10 Toner (Black) Toner cartridge (0.93kg) SD-360MT × 1 Upper heat roller kit Upper heat roller ×...
- Page 10 SEEG/SUK Name Content Life Product name Packing × 1 Drum OPC drum 200K SF-250DM × 10 100K × 10 Developer (Black) Developer (1.0kg) SD-360LD × 10 28K × 10 Toner (Black) Toner cartridge (0.93kg) SD-360LT × 1 Upper heat roller kit Upper heat roller ×...
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Page 11: Environmental Conditions
SCA, SCNZ, Middle East, Africa Name Content Life Product name Packing × 1 Drum OPC drum 200K SF-250DM × 10 100K × 10 Developer (Black) Developer (1.0kg) SD-360LD × 10 28K × 10 Toner (Black) Toner cartridge (0.93kg) SD-360LT × 1 Upper heat roller kit Upper heat roller ×... -
Page 12: Option Specifications
[3] OPTION SPECIFICATIONS 1. SF-A55 Name Duplex reversing automatic document feeder Document feed system Continuous, automatic feed Document exit system Face up exit Document transport system One-belt, (center reference) Document set direction Face up A3 ∼ B5 Document size Thin paper mode, 35 ∼ 50g/m Document weight standard mode, 51 ∼... -
Page 13: 4 ] Paper
[4] PAPER 1. Standard paper for tray feed Quanty in one Name Size Type SF-3AS2 250 sheets SF-4BS2 500 sheets SF-4AS2 500 sheets Standard type SF-5BS2 (Horizontal) 500 sheets each SF-5Bs3 (Vertical) SF-5AS2 250 sheets SF-6BS2 250 sheets SF-3AM2 250 sheets SF-4BM3 500 sheets General type... -
Page 14: External View
[5] PRODUCT VIEW 1. External view 2. Internal view Transport section Roller rotation knob adjustment knob Transport section Duplex tray open/close lever Operation panel Front cover Waste toner box Fusing section Manual feed guide Manual feed additional tray OPC drum Manual feed tray Toner cover Original cover... -
Page 15: Operation Panel
3. Operation panel 13 14 15 16 TRANSPARENCY COVERS/ MARGIN ERASE DUAL PAGE AUTO IMAGE SCROLL DISPLAY INSERTS INSERTS SHFT COPY SORTER ORIGINAL TO COPY INFORMATION REDUCTION ENLARGEMENT PROGRAM 100% SORT (ORIGINALS) EVEN NUMBER CLEAR ALL ODD NUMBER START ATAPLE SORT ZOOM EXPOSURE... - Page 16 4. Internal structure (Japan model) 7 10 9 30 29 No. 2 mirror No. 3 mirror No. 1 mirror Copy lamp Lens unit Main charger unit Blank lamp No. 6 mirror No. 4 mirror No. 5 mirror Developing unit toner box Developing unit Transport roller (upper) Transfer charger...
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Page 17: Paper Feed Unit
5. Unit Process unit Suction frame unit Fusing unit Optical unit Developing unit Toner hopper unit Transport unit Center tray unit (ADU) 500-sheet tray unit Paper feed unit 5 – 4... - Page 18 6. Clutches and solenoids Signal name Part name Function and operation Remark CPFC1 No. 1 cassette paper feed clutch No. 1 tray paper feed roller rotation CPFS1 No. 1 cassette paper feed solenoid No. 1 tray take-up roller rotation CPFC2 No.
- Page 19 7. Switches and sensors 40 43 37 36 29 27 Signal name Part name Switch/sensor Function/operation Remark LUD1 No. 1 cassette upper limit sensor Sensor No. 1 tray upper limit sensing PED1 No. cassette paper sensor Sensor No. 1 tray paper presence sensing LUD2 No.
- Page 20 Signal name Part name Switch/sensor Function/operation Remark Lens home position sensor Sensor Lens home position sensing DPFD ADU paper feed sensor Sensor Duplex section paper feed sensing Duplex section rear plate home position DTBHPS ADU rear plate home position Sensor sensing Duplex section alignment plate home DTWHPS...
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Page 21: Motors
8. Motors Mirror motor Main motor Drum motor Toner motor Duplex motor 1 (for shifting Duplex motor 2 (for shifting No. 4, 5 mirror base motor Lens motor the rear plate) the alignment plate) Cooling fan motor Ventilation fan motor 1 Ventilation fan motor 2 Ventilation fan motor 3 Suction fan motor... - Page 22 9. PWB unit list DC power PWB High voltage PWB AC circuit PWB Main control PWB Operation control PWB Operation PWB 1 Operation PWB 2 Operation PWB 3 LCD invertor PWB LCD unit DL PWB BL PWB Original sensor light emitting Original sensor light receiving Sensor volume PWB AE sensor PWB...
- Page 23 10. Large capacity cassette unit (LCC) Signal name Part name Switch/sensor Function/operation Remark TLMD Tray upper limit sensor Sensor Tray upper limit sensing Tray lower limit sensor Sensor Tray lower limit sensing Tray paper upper section and paper Tray paper upper section sensor Sensor presence sensing TPTD...
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Page 24: 6 ] Process Section
[6] PROCESS SECTION Light Dark area Dark area (Photocondor drum and cleaning unit) 1. Basic theory Base With the indirect static copier, a plain paper is used for the copy paper. As a latent static image is formed on the surface of the photoconductor, the image is then developed into visible (toned) Theory of photoconduction image using the toner. -
Page 25: Characteristics Of Photoconductor
[Acceptor potential] The resistance in the dark area of the photoconductor decreased as Photoconductor the electric field increases among layers. sensitivity As the electric field is formed to a higher value as the photoconductor Photoconductor is charged, the resistance in the related layer decreases and the rate strength of charge retained in the photoconductor is restricted. -
Page 26: Sf-2035 Basic Process And Structure
2. SF-2050 basic process and Exposure structure • The Scorotron method is used to evenly charge the photoconduc- tor surface to the given potential in the charge process. The corona wire regularly used is now replaced with a new corona charge mechanism that employs the 0.1mm thick stainless steel... -
Page 27: Relationship Between The Opc Drum And Light
Photo mode STEP 5. Separation The photo mode is provided to make clear half-tone copy of the photo Though the copy paper and the drum are both negatively charged originals. after transfer, the negative potential on the drum is higher than that In the photo mode, the grid voltage and the copy lamp voltage are on the copy paper, generating an attraction force between the drum lower than in the standard copy mode (the copy density of the black... -
Page 28: Transition Of Photoconductor Surface Potential
Light area Residual potential (4) Photoconductor drum sensitivity correction In the SF-2050, fall in sensitivity due to long use of the photoconduc- tor drum is corrected by the copy lamp light intensity to prevent against considerable change in copy quality. -
Page 29: Process Control Function
MC grid bias EX: 100. output selection output (density In the SF-2050, the absolute value of the Process Control Sensor correction) is not used for control calculation, but the ratio of the sensor in each mode output from the bare drum and the sensor output from the toner (Light quantity patch is used. -
Page 30: Basic Structure
4 When Simulation 46 is performed. will occur. Drum marking Fig B In the SF-2050, a toner patch image is formed in the same position on the photoconductor drum surface to improve the accuracy of the process control. Vg(p)+250 Step3... -
Page 31: 7 ] Developing Section
2. Structure [7] DEVELOPING SECTION 1. Basic theory (1) Two-component developer The developer consists of toner and carrier, which is usually called developer. The carrier is a media that applies toner to the static latent image on the photoconductor. As the carrier is stirred with the toner, the friction occurred thereby charges it to positive or negative. -
Page 32: 8 ] Paper Feed Section
2. Basic configuration [8] PAPER FEED SECTION 20 19 1. Outline The front load method and the foldable multicopy table are provided to save space. The machine is equipped with four 550-sheet casset- tes and a manual feed multicopy table that may feed up to 50 sheets. Use of the large capacity cassette (LCC) (option) allows to expand the system. -
Page 33: Basic Operation
3 When the pawl C of the manual feed spring clutch A is caught by 3. Basic operation the manual feed latch, the manual feed stopper goes down by the eccentric cam inside the spring clutch and the manual feed takeup (1) Manual paper feed operation roller goes up by the eccentric cam outside the spring clutch. - Page 34 • 6 The manual feed solenoid turns off, the pawl A of the manual feed 4-stage tray paper feed unit spring clutch A is caught by the manual feed latch, the manual Take-up roller feed operation terminates. The copy paper is then sent to the Tray paper feed transfer unit by way of the resist roller.
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Page 35: High Voltage Section
[9] TRANSPORT/FUSING SECTION [10] HIGH VOLTAGE SECTION 1. General 1. General The SD-2050 allows transport of paper of max. A3 (11" x 17") and There are three kinds of coronas; the main corona, the transfer min. A5 (8 1/2" x 5 1/2"). corona, and the separation corona. -
Page 36: Optical Section
[11] OPTICAL SECTION 1. General The SF-2050 is composed of the fixed focus lens and six mirrors. The The automatic exposure sensor is provided to sense density of the lens and the mirrors are moved by the stepping motor to positions... -
Page 37: No. 4, No. 5 Mirror Base Home Position Sensor (Mbhps)
(6) No. 4, No. 5 mirror base home position sensor (17) Reflector (MBHP) Light from the copy lamp is reflected by the reflector onto an original. This sensor is used to sense mirror base C (No. 4, No. 5 mirrors). The output of this sensor serves as the basic signal to control the (18) Exposure adjusting plate copy magnification ratio. -
Page 38: Basic Operation
Mirror base scan speed 3. Basic operation Lens and mirror positions (Relation between an original, the lenses, and images in each mag- are changed to adjust the nification ratio) Copy paper magnification ratio. Normal copy: The distance between the original surface set on the feed direction table glass and the lens is adjusted to the distance Mirror scan speed is changed to adjust the magnification ratio. -
Page 39: Optical System Dirt Correction
4. Optical system dirt correction Reference plate (Glass holder) Table glass In the SD-2050, exposure density is corrected by changing the copy lamp light quantity depending on dirt in the optical system (the copy lamp unit, No. 1 mirror, No. 2 mirror, No. 3 mirror). The optical system dirt correction is performed as follows to prevent Copy lamp light quantity "UP"... -
Page 40: Adu Unit
[12] ADU UNIT 1. Basic operation The ADU unit is stored under the transport base plate inside the copier. In duplex copy, the paper discharged from the curl correction unit is moved on the tray and aligned by the rear edge guide and the alignment plate, then pressed by the take-up roller. - Page 41 12 – 2...
- Page 42 12 – 3...
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Page 43: Electrical Section
[13] ELECTRICAL SECTION 1. System block diagram 13 – 1... -
Page 44: Main Circuit
2. Operations at power ON Power ON (Note 1) When toner density level is above the specified level after 0.5 sec rotation of the drum motor (DM), the drum motor will stop in about 20 sec. Main CPU initial setting (Note 2) Racing is started after 2 min 31 sec. - Page 45 (1) CPU (IC116) Signal list Pin No. Signal name Port In/Out Description THVG P90/PW3/IOF10 Transfer charger output "H" SHVG P91/PW4/IOF11 Separation charger output "H" BIAS P92/PW5/IOF12 Developer bias output "H" PPD3 P93/IOF13 PPD3 ON detection DWMA P94/IOF14 — Duplex alignment plate stepping motor phase A DWMB P95/IOF15 —...
- Page 46 Pin No. Signal name Port In/Out Description Address bus A11 Address bus A12 Address bus A13 é Address bus A14 â Address bus A15 ä P50/A16 Address bus A16 à P51/A17 Address bus A17 å P52/A18 Address bus A18 ç P53/A19 Address bus A19 ê...
- Page 47 (2) CPU input signal matrix PPD1 PFDL2 MPED DSWF CSS41 CSS31 CSS21 CSS11 "L" "L" "L" "H" "L" "L" "L" "L" DPPD1 DPFD DTPD DPUNDin CSS42 CSS32 CSS22 CSS12 "L" "L" "H" "H" "L" "L" "L" "L" DVCHiN DPTD DPPD3 DPPD2 CSS43 CSS33...
- Page 48 Pin No. Signal name Port In/Out Specification TRC1 Transport roller clutch 1 "H" TRC2H "H" Transport roller clutch 2 RRCout Resist roller control clutch "H" Discharge lamp "H" LUM1 "H" No. 1 cassette lift-up motor trigger LUM2 No. 2 cassette lift-up motor trigger "H"...
- Page 49 Pin No. Signal name Port In/Out Specification "H" Heat roller solenoid Power relay "H" Dry heater relay "H" Toner motor 1 "H" Toner motor 1 "H" "H" Suction motor Fan motor "H" MSWRES "H" Main switch reset signal Read input "L"...
- Page 50 (8) Power circuit in the main circuit The fan motor control is classified into two categories as follows: In the SD-2050/SF-2050 main PWB, the 24V power voltage is sup- 1 ON during copying only plied from the DC power circuit, and IC103 (78M10H) and IC111 Optical system fan motor (CFM1, CFM2, VFM) (78M05H) generate the power used in the main circuit.
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Page 51: Block Diagram
(12) Blank lamp control circuit 4. Operation circuit The blank lamp radiates light to the non-image area on the photocon- ductor to discharge the void area in the copy lead edge and the General non-image area in reduction copy. • The operation circuit is composed of the key matrix circuit and the display circuit. -
Page 52: System Configuration
When any abnormal signal enters the circuit, all the bits are cleared. System address (Refer to *1.) C1, C2, C3, C4, C5 Then the operation starts from the first bit again. These data are set with the switches and assigned depending When data of more than 16 bits (17 pulse or more) are inputted, it is on the system. -
Page 53: Display Circuit
<Display circuit> This circuit is controlled with the data signal and the control signal from the main control circuit. (1) Block diagram SEG0 SEG1 DATA SEG2 Operation control LATCH circuit 32 bit driver block diagram (2) Operational description DATA 32 bit Shift Register SQ32 Clock Data signal... -
Page 54: Lcd Display Circuit
5. LCD display circuit (1) Block diagram Driver IC409 Counter DC PS PWB REARY Driver Card COPY counter +5V -20V GND2 +24VOP +10V IC422 Driver IC409 DATA D0 ~ D7 +10V Main A0 ~ A15 GND2 IC411 A-RAM +24V V-RAM GND1 Buffer Buffer... - Page 55 CPU (IC411) pin signals Signal Signal IN/OUT Description IN/OUT Description name name Data read signal — DTR_OP main communication DTR_OP ‘ Main communication TXD-OP Address signal Main communication RXD-OP Address signal LED clock Reset signal input from the main DATA LED data RESET —...
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Page 56: Rom
(3) ROM Pin arrangement (IC414) General A. Program ROM (IC410) (27C512) B. Data ROM (IC411) (27C512) C. G ROM (IC414) For storing graphic data. (27C020) D. C.G ROM (IC501) For storing character data. (Mask ROM) 27C020 Pin arrangment (IC410/IC411) ROM pin signals (IC414) Pin No. -
Page 57: Rectifying/Smoothing Circuit
6. DC power operational descriptions (1) General When the specified AC input in applied to it, the power unit supplies 5 lines of DC outputs of +38V (VA), +24V (VB), +10V (VC), +5V (VD), and –20V (VE), and pulse signal FW in synchronization with the AC input. -
Page 58: Power Supply
In the case of the 200V series, the smoothing capacitors C707 ∼ (6) Secondary rectifying/smoothing output circuit C709 are charged by the electric field effect transistors Q714 and The output obtained from the transformer T701 is outputted through Q715 in synchronization with the IC Z701 control signal by the reactor the smoothing choke coil L707 and the smoothing capacitor. - Page 59 (9)-2. +10V (12)-4. +5V For the +10V also, the LC filter is composed of the reactor L711 and The +5V is protected by the D/D convertor protecting function the capacitor C747 for ripple compression. described in item 8. In this case, the electric field effect transistor Q710 is turned off by (9)-3.
- Page 60 CAUTION FOR BATTERY REPLACEMENT (Danish) ADVARSEL ! Lithiumbatteri – Eksplosionsfare ved fejlagtig håndtering. Udskiftning må kun ske med batteri af samme fabrikat og type. Levér det brugte batteri tilbage til leverandoren. (English) Caution ! Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the equipment manufacturer.