Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Tandon TM848-1
Summary of Contents for Tandon TM848-1
- Page 1 R po RATIDN 20320 PRAIRIE STREET CHATSWORTH, CA 91311 TELEPHONE NO.: ( 2 1 3 ) 993-6644 TWX NO.: 9 1 0 494 1 721 T EL.EX NO.: 1 9 4 7 9 4 COPYRIGHT 1982 TANDON COR P O R ATION...
- Page 2 The information contained in this document is the property of Tandon Corporation. It may not be duplicated in full or part by any person without prior written approval. The material in this document is provided for informational purposes, and is subject...
- Page 3 T ABLE OF CON T E N T S Page Section Number Title of Section Number SECTION I INTRO D U C T ION TO THE TM848 FAMILY OF DISK DRIVES . 1-1 Introduction. . 1-1 Purpose Of The Drive .
-
Page 4: Table Of Contents
Section Page Title of Section Number Number 1-21 1.1 9.1 8 Inhibit Write When Write Protected 1-21 1.1 9.1 9 Allow Write When Write Protected . Head Side Select Options S1 - S3 1-22 1.1 9.20 1.1 9.21 Spindle Motor Control Options M1 - M4 1-22 1-22 1.1 9.22... - Page 5 Section Page Number Title of Section Number Activity L. E. D Load Arm Assembly. 5-1 0 Track 00 Sensor Assembly. 5.10 . 5-10 5-1 1 Write Protect Sensor Assembly 5.1 1 5-1 2 5.1 2 Door Switch Assembly Index Sensor Assembly. 5.1 3 .
- Page 6 LIST OF ILLUSTRATIONS FIGURES Figure Page Number Number Title of Figure TM848 Disk Drive Mounting Configuration. TM848 Disk Drive Functional Block Diagram. 1-10 FM Recording Magnetization Profiles 1-11 Write Operation Timing Diagram 1-12 Read Timing Diagram. 1-15 Circuit Board Assembly 1-16 General Control and Data Timing Requirements 1-19...
- Page 7 FIGURES Figure Page T i t l e et F i e r e Number Number 5-1 0 Bezel and Related Parts 5-1 'I Activity L. E. D. Key Parts .. 5-9 5-1 2 Load Arm Assembly Key Parts .. 5-10 5-1 3 5-1 1 Track 00 Sensor Assembly Key Parts...
- Page 8 The TM848-1 is a s i n gle-sided drive. The TM848-2 is a d o u b le-sided drive. The only difference between the two drives is the number of heads. The circuit board is identical in both models.
-
Page 9: Mechanical And Electrical Specifications
The head is positioned over the desired track by means of a stepper motor/band assembly and its associated electronics. This positioner employs a 3.6 degree rotation to cause a one-track linear movement. When a write-protected diskette is inserted into the drive, the Write Protect sensor disables the write electronics of the drive, and a Write Protect status output signal is available to the interface. - Page 10 Seek Errors: 1 in I 0' seeks PERFORMANCE Head Wear Guarantee: 15,000 media hours Number of Tracks: 77 for TM848-1; 154 for TM848-2, 77 per surface Track-To-Track Access Time: 3 milliseconds Head Settling Time: 15 milliseconds Average Access Time, including head settling time:...
-
Page 11: Power Requirements
TABLE 1-2 POWER REQUIREMENTS + 5 V o l t s : 0.70 Amps typical 2. + 2 4 V o l ts: After motor start interval Spindle Moto r 0 .3 5 A m p s t y p ical Stepper Moto r 0.4 0 A m p s t y pical Electronics... - Page 12 A. Inspect the shipping package for obvious damage. B. Open the shipping container, and remove the drive. C. Inspect the drive's overall appearance. Ensure that there are no scratches on the bezel. D. Ensure that all internal connectors are seated properly. E.
-
Page 13: Figure
6-32 THD THRLI 4 PL (2 EA. SIDE) 8.00 13.33 149 DIA. TOP X 1 56 DIA. BOTTOM X 3.50 .430 DP. 4 PL I 20 8 550 1 60 2.300 NOTES. DIMENSIONS GIVEN IN INCHES. Figure 1-1 TM848 Disk Drive Mounting Configuration 1.10.1 H ardw a r e The drive is manufactured with certain critical internal alignments that must be maintained. -
Page 14: Disk Change
The following list contains information on how the diskette can be cared for, handled, and stored. 1. Keep the diskette away from magnetic fields. 2. Do not touch the precision surface of the diskette with fingers. 3. Insert the diskette carefully into the drive until the backstop is encountered. 4. - Page 15 3. Spindle Drive Control 4. Carriage Position Control 5. Write/Erase Control 6. Read Amplifier and Digitizer Figure 1-2 is a functional block diagram of the drive. It should be referred to in conjunction with the following sections. The data in the ensuing figures is primarily represented in simplified form. 1.15.1 Inde x P u l s e An index pulse is provided to the user system via the index pulse interface line.
-
Page 16: Tm848 Disk Drive Functional Block Diagram
1.15.3 Sp in d l e D rive System The spindle drive system consists of a spindle assembly driven through a drive belt by a brushless D.C. motor/tachometer. The servo electronics required for speed control are located on the printed circuit board. The control circuitry contains an interface control line. -
Page 17: Fm Recording Magnetization Profiles
B IT PATTERN~ BIT C E L L WRITE DATA D I C MAGNETIZATION MAGNETIC ELEMENTS N N S S S S N N S S • Figure 1-3 FM Recording Magnetization Profiles The erase gaps provide a guard band on either side of the recorded track. All signals required to control the data electronics are provided by the user system and are shown in the TM848 drive functional block diagram (see Figure 1-2). -
Page 18: Write Operation Timing Diagram
The Trim Erase control goes true 190 microseconds after the Write Enable interface line since the trim erase gaps are behind the read/write gap. It should be noted that this value is optimized between the requirements at Track 00 and at Track 76, so that the effect of the trim erase gaps on previous information is minimized. -
Page 19: Read Timing Diagram
The output signal from the read/write head is amplified by a read preamplifier and filtered by a low- pass linear phase filter to remove noise (see Figure 1-5). The linear output from the filter is passed to the differentiator, which generates a wave form whose zero crossovers correspond to the peaks of the Read signal. - Page 20 TABLE 1-3 I N TE R FAC E CO N N ECTO R P I N ASS I G NM E N TS s i nal Ground Pin Number Write Current Switch Motor Off Control 1 2 4 6 Motor Off Control 2 Motor Off Control 3 Two Sided (option) (Model TM848-2 only) Disk Change (option)
- Page 21 TABLE 1-4 P OWE R C O N N E C T O R PIN ASSIGNM E N T S I Vo l t a e 24V D. C. Return Return Return 5V D. C. 1.17 TERM IN A T ED LINES 1.17.1 Inp u t L i n e Terminations From Removable Resistor Pack The drive has the capability of terminating the following input lines:...
-
Page 22: Circuit Board Assembly
2S oo D S ' I 0 0 0 0 0 1b 0 00 DS2 2bo oo DS3 0 RM 3b o oo DS4 4b 0 Q (0 IZ 0 MC200$ MC1 S2 0 O S 1 ALTERNATE TEST POINT INDEX TRIGGERING Oo Y MC4 0 O~ Qas2... -
Page 23: General Control And Data Timing Requirements
D.C. POWER MOTOR OFF DRIVE SELECT 500 NSEC. MINIMUM 0.8 SEC MAXIMUM OUTPUTS VALID 500 NSEC'MINIMUM DIRECTION SELECT 1 USEC. MINIMUM 1 USEC MINIMUM STEP 1 USEC. M I Nl MUM 3 MILLISECONDS MINIMUM SIDE SELECT 100 NSEC MINIMUM WRITE GATE 4 USEC. -
Page 24: Inhibit Write When Write Protected
US ER S E L E C TABLE OPTIONS The description of user selectable options should be used in conjunction with the following list of options that are available for model numbers TM848-1 and TM848-2 (see Table 1-5). TABLE 1-5... - Page 25 1.19.1 Dri v e S e lect DS1-DS4 This option allows the user to daisy chain up to four drives, and to enable one drive at at time. Drive select is implemented by shorting one of the four connections, using a shorting plug. The drive comes equipped from the factory with DS1 installed.
-
Page 26: Radial Ready Installation
DREDv + PROGRAM SHUNT PINS 7-10 ARE OPENED 4 7 R4 4 .. IIEA AY ~E I/i' L'502, SIDE 1- LAOK IN1 FF+ IREADY- DRSEL -I M 2~ ETCH CUT RA7ilK ~READ i XM cc STATUS TO USER CONTROLLER Figure 1-8 Radial Ready Installation Note MC1 through MC4 cannot be used as radial motor control when using this option. -
Page 27: Radial Index Installation
PROGRAM SHUNT PINS 6-10 ARE OPENED 4.7 l4 DRSEL + INDEX + I <~ RADIAL INDEX STATUS TO USER M C '5 CONTROLLER Figure 1-9 Radial Index Installation 1.19.9 In de x A l t e r nate Output Pad (I) The internal index pulse is gated with drive select to give a low true signal at Pad I. -
Page 28: Radial Head Load Signal
1.19.14 Stepper Power From Drive Select (DS) This option allows the user to remove D. C. power from the stepper motor using drive select, which results in lower stand-by current consumption. The Stepper Power From Drive Select option is implemented by installing DS, and cutting HL. 1.19.15 Stepper Power From Head Load Line (HL) This option supplies power to the stepper motor when the head load line goes low(true). -
Page 29: Motor Control Select Options Mc1 - Mc4
Note This option does not stop the write protect signal from being sent on the interface line. This option is implemented by cutting WP, and by installing NP. 1.19.20 Head Side Select Options S1-83 This option allows heads to be selected by side select, drive select, or the direction control signal. The drive comes with side select, S2, installed. -
Page 30: Introduction
SECTION II M AINTENANCE C H E CKS AND ADJUST M E N T S INTR O DUGTI ON This section is for the use of the OEM Repair Department. It contains checks and adjustments that are used during the normal life of the drive. Before applying power to the drive or doing any checks or adjustments, visually inspect the drive to ensure that it has no missing or broken parts. -
Page 31: Cats Eye Alignment Check And Adjustment 2
N e g a t ive, Channel A, R33 Note For the TM848-1 single-sided drive, trigger off of R33. For the TM848-2 double-sided drive, trigger off of Test Point 12, with the exception of azimuth, which must be triggered off of R33 (see Figure 2-1). -
Page 32: Hub Center Line And Track Locations
HUB CENTER LINE TRACK 0 TRACK 38 TRACK 76 Figure 2-2 Hub Center Line and Track Locations... -
Page 33: Cats Eye Alignment Check
2.2.1 Cat s Eye Alignment Check A. Set up an oscilloscope, as follows: Channel A; Test Point 2 alternate is Test Point 4 on R30 Channel B: Test Point 3 alternate is Test Point 5 on R29 Ground Test Point 1 Read Differentially: A plus B, B inverted Time Base:... -
Page 34: Head Carriage Adjustment
H. Verify that the smaller of the two Cats Eye lobes is not less than 75 percent in amplitude of the other one. The calculation is: am p o f smaller lobe a mp o arger o e I. Step the drive to Track 00, then, step it back to Track 38. J. -
Page 35: Index Sensor Checks And Adjustments
E. Reverify the Cats Eye alignment (see Section 2.2.1). I NDEX S E N S O R CHECKS AND ADJUSTMENTS The index adjustment changes the time period from the index pulse to the start of the data. The adjustment should be checked after the drive has been aligned (see Section 2.1.1) or when diskette interchange errors are suspected. -
Page 36: Index Sensor Adjustment
Time Scale: 50 usec per division Figure 2-5 Index-to-Data Burst K. When both index measurements on a double-sided drive or the one index measurement on a single-sided drive meet the specifications, see Section H, check the index-to-data burst on Track 76. L. -
Page 37: Index Pulse Width Check
B. Adjust the index sensor with a flat blade screwdriver until the index-to-data burst occurs 200 microseconds + 100 microseconds from the leading edge of the index pulse. C. Tighten the index sensor's retaining screw. D. Reverify the index-to-data bursts (see Section 2.3.1). 2.4.3 Index P u lse Width Check The index pulse width is nonadjustable. -
Page 38: Amplitude Check
D. Confirm the position by observing the Cats Eye pattern. E. Attach Channel A to Test Point 10. F. Restore the carriage to Track 00, and ensure that the Track 00 L. E. D. on the exerciser turnson. G. Seek to Track 1, and ensure that the signal at Test Point 10 is high. H. -
Page 39: Azimuth Check
C. Connect an oscilloscope to Test Points 4 and 5, using Test Point 1 as a ground. D. Set up an oscilloscope as follows: Channel A: Test Point 4, 1 volt per division Channel B: Test Point 5, 1 volt per division Both Channels: A. -
Page 40: Optimum Head Azimuth Alignment
Note Measure the azimuth burst. Ensure that Burst 1 is less than or equal to Burst 2, and that Burst 4 is less than or equal to Burst 3. Figure 2-9 Optimum Head Azimuth A l i gnment E. Figure 2-10 depicts an azimuth of exactly minus 9, 12, or 18 minutes, depending upon the manufacturer of the diskette used. -
Page 41: Load Arm Adjustment
Figure 2-11 Head Azimuth Alignment of Acceptable Upper Limits Note The head's azimuth is not adjustable. It is suggested that the drive be sent to an authorized repair center or a new Head assembly be installed. In the latter case, all previous adjustments should be made again. LOA D A R M A D J U STMENT This adjustment is made to ensure proper loading of the head when the diskette is engaged (see Figure 2-12). -
Page 42: Section Ii I
SECTION I I I PRINTED CIRCUIT BOARD O P E R A T IO N INTRODUCTION This section contains the interface description and the circuit board theory of operations for the TM848 familyof disk drives. In addition, Sections 3.1 and 3.2 contain schematic diagrams of the circuit boards Installed in the drive. -
Page 43: Input Control Lines 3
It is recommended that the interface cable be flat ribbon cable, with a characteristic impedance of 100 ohms. Interface connector pin assignments are given in Table 3-1. I N P U T C O N T R O L LINES A. -
Page 44: Drive Interface Lines And Pin Connectors
TABLE 3-1 • D RIVE INTERFACE LINES AND PIN CONN E C T O R S Ground Signal Pin Number Write Current Switch Motor Off Control 1 Motor Off Control 2 3 5 7 9 Motor Off Control 3 Two Sided (Strappable) (Model TM848-2 only) Disk Change (Strappable) Side Select (Model TM848-2 only) Activity Indicator (Strappable) - Page 45 Functional Description The TM848 has a D. C. brushless motor that can be enabled in three ways: 1. By using the four radial Motor Control lines, MC1 through MC4. 2. By the Head Load line using shorting plug M4. Using this line enables all drives' Motor On lines.
-
Page 46: Stepper Logic Truth Table
Circuit Description The Direction line comes in on Pin 34 of the interface connector. A high signal directs the step logic to step toward Track 00. A low signal directs the step logic to step toward a higher numbered track. The direction line sets the proper phase to the exclusive OR gates of U9. -
Page 47: Write Data Circuit Block Diagram
inverted and gated with Write Protect and Drive Select to enable U23, U30, and Q13. Transistors Q13 and Q12 are write current switches. Q13 and Q12 are on in parallel when the low Write Current interface is high (false). This results in a write current of 10 milliamps. When the low Write Current line goes low (true), transistor Q12 turns off, and the current decreases to 7 milliamps. - Page 48 Circuit Description Data is sent to the drive via interface Pin 38. This signal is inverted by U22, and is used to clock the D flip flop U23. The outputs of U23 are inverted subsequently, and used to drive Q15 and Q17, which direct the write current to the correct winding.
-
Page 49: Trim Erase Diagram
WRT GATE 4us max. WRT DATA WRT TRAN + U30, Pin 12 Sec A, Q output 550us U30, Pin 13 Sec B, Q output U31, Pin3 Trim erase Source Figure 3-5 Trim Erase Diagram... -
Page 50: Side Select Schematic Diagram
+SVK (SII 4 + IZV + 12V CR'IS Rlol I OK II f"T D SI Z I o LS04 R&4 SUSV+ ZKi4 125 LS04 ZN4125 Zkl4 IZS DS2, Q Ilo 740Co DS2 2S LS04 CT I 4.7jcj' QSS >0 LSOO D S4 S Z 5.2K R O'S... -
Page 51: O Utput Control Lines
O U TPU T C O N T R O L LINES A. INDEX/SECTOR Functional Description The Index signal is provided once cash revolution (166.667 milliseconds nominal) to indicate the beginning of a track to the controller. The Index line remains in a low(true) state for the duration of the index pulse. - Page 52 Circuit Description The disk change flip-flop, U10, is reset by OPEN- whenever the lever is in the open position. When this occurs, U10-6 is high, and a true disk change status is sent to the interface on Pin 12 from U4-11. Flip- flop U10 is set on the trailing edge of drive select causing U10-6 to go low and setting the disk change status to the false state.
-
Page 53: Track 00 Schematic Diagram 3-1
TRS CK L.E.O TRIO Il u l l 23 3 2 7 4 4eK glt3 ~ C K 4 7 K . LIAS 33 4ENf30R. T'22ll~f "Po 22K. 470 K. Figure 3-9 Track 00 Schematic Diagram Circuit Description When the read/write carriage is restored to Track 00, a tab on the carriage blocks light from the Track 00 L. -
Page 54: Write Protect Schematic Diagram. 3-1
DRIVEL+ 5 WRITE +~" WRITE PROTECT PROTECT L.E.D. WRPROT- 5 RP4 WRITE+ 4.7K, PROTECT M'539 SENMR 22lC. 4 7 O Kr Figure 3-10 Write Protect Schematic Diagram Test Points 2 and 3 (see Figure 3-11) are provided to observe the differential output of the first stage of Read signal preamplification. -
Page 55: Read Circuit Block Diagram
TEST POINT 2 UPPER HEAD READ AND HEAD SIGNAL SWITCHING AMPLIFIER TEST POINT 3 CIRCUITS LOWER HEAD TEST POINT 4 TIME DOMAIN CROSSOVER DIFFERENTIATOR FILTER DETECTOR TEST POINT S DATA OUTPUT DIGITIZER INT WRT BUSY UNIT SELECT Figure 3-11 Read Circuit Block Diagram Circuit Description When a two-sided diskette is installed, the signal IN1FF+ is generated and gated by U4 to enable the low-going output Two Sided. -
Page 56: Read Data Schematic Diagram
4I2V R135 10 n +IZV T P I T P 5 T P4 T P C, 412 V 39/3ui I K. O.'I'I 47yf 14 V2 I K I 93 0.47y/ I K. Czar ZZO I% C OPl IS K. lK I33 1.2K CR15 2/3 /... -
Page 57: Troubleshooting Guide
SECTION IV TROUBLESHOOTING GUIDE I NTROD U C T IO N This section is presented in the form of a table. Each section contains four major parts: 1. The section number. 2. A statement of the presenting condition. 3. A list of the possible causes of the condition. 4. -
Page 58: Not Ready And/Or No Index
POSSIBLE CAUSE S ECTION CO NDIT I O N RECO M M EN D E D A CTION NOT READY Diskette not inserted. Insert diskette. AND/OR Diskette not clamped. NO INDEX Turn knob lock lever clockwise so that it is perpendicular to the diskette insertion slot. -
Page 59: Will Not Write
S ECTION CO NDI T I O N POSSIBLE CAUSE RECO M M EN D E D A CTION WILL NOT WRITE Inte r f ace not enabled. Verify write enable, select, and write data interface lines. Heads or write protect switch not connected. -
Page 60: Drive Motor Will Not Start When Door Latched
S ECTION CO NDI T I O N POSSIBLE CAUSE RECO M M E N D E D A CTION ACTIVITY L. E. D. I NOP E RAT I VE Activity L.E.D. Check P11 not connected. Activity L.E.D. Replace Activity defective. -
Page 61: Introduction
SECTION V REPLACEIVIENT PROCEDURES I NTRODU C T I O N This section contains the replacement procedures for the TM848 family of disk drives' parts and assemblies: 1. Drive Belt 2. Drive Motor 3. Circuit Board 4. Cone Assembly 5. Diskette Lever 6. -
Page 62: Drive Belt And Spindle
DRIVE BELT SMALL FLANGED SPINDLE PULLEY LARGE SPINDLE PULLEY Figure 5-1 Drive Belt and Spindle B. Grasp the drive belt, and remove it from the pulleys. 5 .1.2 I nst a l l a t io n A. With the shiny side inward, loop the new drive belt onto the small, flanged spindle pulley. B. -
Page 63: Drive Motor And Related Parts
DRIVE MOTOR TIE WRAPS MOUNTING SCREWS (3 PLACES) (12 PLACES) DRIVE MOTOR WIRES Figure 5-2 Drive Motor and Related Parts C. Carefully rebundle the wires, including the drive motor wire, and cable harness them (see Figure 5-2). D. Plug P6 into the circuit board. E. -
Page 64: Circuit Board Mounting Screws
MOUNTING SCREWS CONNECTING HEAT SINKS POWER CONNECTOR RETAINING CLIP SCREW Figure 5-3 Circuit Board Mounting Screws B. Remount the circuit board using the two screws to the two heat sinks and the screw and nylon clip that attach the circuit board to the drive's chassis. C. -
Page 65: Cone Assembly Key Parts
CONE BRACKET SCREW CONE ALIGNMENT ARM E-RING A WASHER WAVE WASHER DISKETTE LEVER CONE ASSY Figure 5-4 Cone Assembly Key Parts D. Latch the diskette lever. E. Insert the screw that attaches the cone bracket to the cone alignment arm(see Figure 5-5). E-RING FLAT WASHER WAVE WASHER... -
Page 66: Diskette Lever
DIS KET T E L EVER 5 .5.1 Re mov a l A. Pry off the cover that hides the diskette lever's retaining screw (see Figure 5-6). SHAFT MOUNTING SCREW COVER DISKETTE LEVER Figure 5-6 Diskette Lever Key Parts B. Remove the diskette lever's retaining screw. C. -
Page 67: Diskette Lever Adjustment
BEZEL MOUNTING SCREWS, 2 BEZEL DISKE T T E LEVER BEZEL Figure 5-7 MOUNTNG SCREWS. 2 Diskette Lever Adjustment BRIDGE MOUNTING SCREWS 2 BOTH SIDES BEZEL SCREWS 2 BOTH SIDES Figure 5-8 Bridge Assembly Key Parts D. Carefully pull out the two index L. E. D.'s in the Bridge Assembly. E. -
Page 68: Bezel
MOUNTING SCREWS (2 EA SIDE) BRIDGE ASSY INDEX L.E.D.'s (2) I S K ETTE LEVER SHAFT Figure 5-9 MOUNTING SCREWS Bridge Assembly Additional Key Parts (2 EA SIDE) BEZEL 5.7.1 R emova l A. Remove the diskette lever (see Section 5.5). B . -
Page 69: I Activity L. E. D. Key Parts
5 .7.2 Insta l l a t io n A. Put the bezel on the drive, ensuring that the Activity L. E. D. goes into its holder. B. Install the four bezel mounting screws that attach the bezel to the chassis. 5.7.3 C hec ks A. -
Page 70: Load Arm Assembly Key Parts
LOA D A R M A S S E M B LY 5.9.1 R emov a l A. Remove the circuit board (see Section 5.3.1). B. Remove the mounting screw and washer that are used to attach the Load Arm Assembly to the chassis (see Figure 5-12). -
Page 71: Track 00 Sensor
TRACK 00 SENSOR ASSEMBLY MOUNTING SCREWS P S P BRACKET TIE WRAPS Figure 5-13 Track 00 Sensor Assembly Key Parts C. Remove the P2 wires from the bracket attached to the chassis. D. Remove the two mounting screws that hold down the Track 00 Sensor Assembly. E. -
Page 72: Write Protect Sensor Assembly Key Parts
MOUNTING SCREWS (2) ' $ . . $ P2 P3 WRITE PROTECT SENSOR ASSY. Figure 5-14 Write Protect Sensor Assembly Key Parts 5.11.2 Ins t a l l ation A. Using the two original mounting screws, attach the Write Protect Sensor Assembly to the chassis. -
Page 73: Door Switch Assembly Key Parts
5.13 I NDEX S E N SO R ASSEMBLY MOUNTING SCREW 8 • ~ 0+ P 3 P I DOOR SWITCH ASSEMBLY Figure 5-15 Door Switch Assembly Key Parts 5 .13.1 Re mo v a l A. Remove the circuit board (see Section 5.3.1). B. -
Page 74: Index Sensor Assembly Key Parts, Bottom View
E. Cut the tie wraps along the cable harness (see Figure 5-16). F. Lift out the Index Sensor Assembly (P1). TIE BRACKETS, 2 FAR SIDE TIE BRACKET, I NEAR SIDE LOWER INDEX SENSOR ASSEMBLY (60I MOUNTING SCREW Atoll i<A4 MNI SIIIII Figure 5-17 Index Sensor Assembly Key Parts, Bottom View 5.13.2... -
Page 75: Diskette Ejector Assembly Key Parts
EJECTOR TRIGGER HOLD DOWN SCREW I IIIIII I I I I I I I I II PIVOT BAR EJECTOR SPRING TRIGGER ASSEMBLY Figure 5-18 Diskette Ejector Assembly Key Parts D. Lift up the Bridge Assembly approximately two inches, taking care not to pull the L. E. D.'s from their sockets. -
Page 76: Load Resistor Assembly And Key Parts 5-1
5.1 5.1 Re m oval A. Remove P5 from the circuit board. B. Remove the circuit board (see Section 5.3.1). C. Remove the two mounting screws that attach the Load Resistor Assembly to the chassis. D. Unsolder the wires to the load resistors (see Figure 5-19). E. -
Page 77: Stepper Band Key Parts 5-1
STE PP E R B A N D 5 .16.1 Re mo v a l It is suggested that the drive be returned to an authorized Tandon repair center when removing the stepper band. A. Remove the circuit board (see Section 5.3.1). - Page 78 STEPP E R M O TOR ASSEMBLY 5 .17.1 Re m o v a l It is suggested that the drive be returned to an authorized Tandon repair center when removing the Stepper Motor Assembly. A. Remove the circuit board (see Section 5.3.1).
-
Page 79: Stepper Motor Assembly Key Parts
HEA D C A R R I AGE ASSEMBLY 5 .18.1 Re mo v a l It is suggested that the drive be returned to an authorized Tandon repair center when removing the Head Carriage Assembly. A. Remove the Stepper Motor Assembly (see Section 5.17.1). - Page 80 MOUNTING SCREWS 4 PLACES Figure 5-23 Head Carriage Removal F. Lift out the Head Carriage Assembly. 5.18.2 I ns t a l l ation A. Install the carriage shaft in the carriage. B. Using the four original mounting screws, attach the carriage shaft to the chassis. C.
-
Page 81: Printed Circuit Board
APPENDIX I P RINTED CIRCUIT BOAR D S CH E M A T ICS AND AS S E M B L Y D R A W I N G S... - Page 82 R EVISI O N S +5 v DESCRIPTION IO K B PRDO. RELEA5F EAR 4OOOZ SE.LECTION I C 24 IVIED PE 0 ' I 0 0 5 'C D SI 2 I F CHANGED PER E.O. 40096 U X r l C N Wrr ljlL Oooz 23...
- Page 83 R EVIS I O N S DESCRIPTION SEIZ. SH l +IZV + 12V 1.54 K. 47 K I Vo R IOB R 5 5 7/ob 7/ob Z. 2 Ko Z.2K. AVR / ISC3 ZIV4124 ZN4/24 Gl/5 RIRT DATA SB I to 3.9K CR l7 2N4124...
- Page 84 R EVISI O N S D ESCRIPT I O N M.IF $8 '\ 412Y RPJ5 10 EZ +IZ.V T P4 T D C . +12 V C I5 R.i I IK I'k 14 U2 'IK I% +12.V I K. C2& •...
- Page 85 R EVIS I O N S D ESCRIPT I O N +24V P.R. (AI 4 .7 K +24V 57PEIEI+ 4 8 & I I I I I I I I I I I DIR+ EO H X C .RZ. A > R 7 040 S T EP A/Ir/TOIB IM4003...
- Page 86 R EVISIO N S D ESCRIPT I O N !I2Y 2. SPINDLE lOOK SPEED R133 RI23 R.127 ADJUSTMENT O.4u f ZD K. +12V 2 0.02Z/ff !12 Vl (SH 4) IP~ f Rl Z5 P' 7" LIDS I N15/970* — CS3 0.022~f SPEED CGPLI7 ROt (SIP PACK/...
- Page 87 100000 5!9096-000 RBV ( ,7 - ~ 2 $ ~ rr~~ !5 « r I • ' ',! ', ;I gj R109 1», • '»M«M« ~ ,"-~ »M d • IM 0 23'», ,.pj «2 0 054 !» ,.„"-'"' <g'wsgd+~ 0 «0»»'A'»' rr »5 05 ~»,»...
- Page 88 APPENDIX II REC O M M E N D E D S P A R E PA RTS LIST...
- Page 89 All components are standard commercial parts purchased to original equipment manufacturer's specifications. OEM OPE R ATING AND SERVICE MANU AL, TM848-1 AND TM848-2 THINLINE ™ DISK DRIVES, 48 TPI, TANDON P/N 179 0 3 1-00 1 ALIGNM E N T DISKETTE...
- Page 90 Pi N 1 79031-001 (1 082)