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Sony MDH-10 Service Manual
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Sony MDH-10 Service Manual

Sony MDH-10 Service Manual

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Summary of Contents for Sony MDH-10

  • Page 2 SECTION 1 INTRODUCTION 1-1 CONFIGURATION OF SERVICE MANUAL This manual is maintenance guide for model MDH-10 series. Section 2 describes disc (disk) and tools necessary for maintenance. Section 3 provides fault diagnostic procedure that may require spare parts, measurement, or adjustment.
  • Page 3 1-3-1 SCSI ID Select Assign the drive unit's ID number by setting these switches on ON or OFF. Do not assign the same number as one previously assigned to another SCSI device. Mark ID No. OFF OFF OFF OFF OFF ON OFF ON OFF OFF ON ON ON OFF OFF...
  • Page 4 When Reading/Recording data, set this switch to DATA. Also when playback any audio disc, set this switch to AUDIO. POWER Lamp goes on for both settings. 1-3-4 AVLS When setting this switch to ON. This function allows you to limit the maximum volume without degrading the sound quality.
  • Page 5 SECTION 2 TOOLS AND MEASURING INSTRUMENTS 2-1 GENERAL AND SPECIAL TOOLS The tools and measuring equipments for performing maintenance on the MDH-10 series are followings. 2-1-1 General Tools SONY Parts No. + Screw Driver (DK-20) (for 1.4mm) (7-721-050-09) + Driver 2.6mm...
  • Page 6 (J-905-910-0A) Mech Deck Base (J-905-914-0A) Over Write Head Height Tool (J-905-913-0A) Power Cable (for RF Buffer Board) (J-609-130-0A) BNC (one-end) Cable (J-907-202-0A) Fixture Base (MDH-10) (J-905-911-0A) Pin Board Ass'y (J-905-912-0A) RS-232 Cable (J-905-016-0A) RS-232 I/F Cable (J-905-901-0A) RS-232 Interface 3V...
  • Page 7 Line Out Cable (J-905-919-0A) 2-1-3 Test Discs (Disks) Acceptance Test Procedure (ATP) System disk (OR-D707WA) (8-980-300-07) This disk used for ATP. (for details, refer to section Function Check Disk (OR-D706WA) (8-980-300-06) This disk used for unit adjustment. (for details, refer to section Down Load Program Disk (OR-D702WA) (8-980-300-02)
  • Page 8 (7-661-018-18) Sankol (FG-84M) (7-662-001-36) MD DATA is trademark of Sony Corporation. ADAPTEC is a registered trademark of Adaptec, Inc. of the U.S.A. Other names of the companies and products appearing in this manual are trademarks or registered trademarks of those companies.
  • Page 9 When using following Test terminals listed below on the Pin board, you can easily conduct any adjustment or measurement. (3) Installation to Fixture Base (MDH-10) a. Remove the installation screws (4pcs) from the Fixture Base. b. Carefully attach the Pin Board Ass'y to the Fixture Base.
  • Page 10 Read Only Disc. Configuration (Refer to Fig. 2-2-2) Main Board MTN Cable Power Cable (2) Error Rate Counter (MD) Function Switches SW1 ... This switch is to supply DC5V voltage to this board. SW2 ... When it is set to 10sec side, this will show the count number of C1, C2 and AT errors appeared in 73500 frames (ten times as large as 7350) every 10 seconds.
  • Page 11 location of cluster/sector. This monitors ADIP signal Read errors (ATER) every sector (98 frames) and indicates count No. of errors appeared in 75 sectors (7350 frames). 2-2-3 RF Buffer Board This board shows +/- 12V with silk pattern but this board works with any of +5 ~ +12, and -5 ~ - 12V.
  • Page 12 the disc to be repaired with SAFE FORMAT option and repair destroyed data on a standard disc. (Refer to Instruction Manual for details.) 2-3 Q/L SYSTEM SETTING AND CONFIGURATION 2-3-1 Set Up Q/L System Note: Make sure DOS (Ver. 5.1 or later) has been installed in the hard disk. Note: ASPI4DOS.SYS of Device Driver for SCSI board has been installed in Config.SYS.
  • Page 13 (page break)

  • Page 15: Troubleshooting

    SECTION 3 TROUBLESHOOTING This section describes troubleshooting method. Section described ATP (Acceptance Test Procedure) procedure. In your repair work, you can easily check how the drive is functioning and determine whether it is really faulty or not. If some error occurs during ATP, define the defective block (part) in accordance with Function Check and the procedure in section and 3-5.
  • Page 16 Test Procedure Check point a. Power Circuit Check a-1. Set a battery pack into the unit under test. (No need to connect a AC adapter.) Power LED (Orange) blinks. a-2. Set the switch on the unit as below. POWER/Mode AUDI Select Terminator/SCS : don't...
  • Page 17 Test Procedure Check point b. Command Check using a Remote Controller b-1. Connect the unit to a Headphone with a remote controller. b-2. Set the switch on the unit and a remote controller as below. Hold : off After a while, following indication (Disc Name, Total playing Time, Track No., Battery Condition) appears in the display window of the remote controller.
  • Page 18 Test Procedure Check point b-5. Adjust the volume by pressing the + The volume will increase (decrease) on the display side or - side of VOL+/- button on the window. remote controller. The volume will not be more than half level of the b-6.
  • Page 19 Test Procedure Check point Each time, the indication changes as follows: c-1. Press the DISPLAY button during play back. d. Repeated Playback Each time, the indication changes as follows: d-1. Press the PLAY MODE button on the remote controller during play back. e-1.
  • Page 20 Test Items Check Point Remarks Power Circuit 1. FFC Connection CN801 2. Voltage Output Refer to 3. Battery Monitor Refer to 3-3-1 Command Check Drive function Refer to 3-3-1-3 using a remote (IC705/IC707) controller 3.5±0.1V (TP325) is +B power obtained. Display Audio Output Refer to...
  • Page 21 3-3-1 Serial Control 3-3-1-1 Pre-setting a. Set the switches on the unit as below. Power / Mode Select : Data Others : don't care b. Connect the unit to the host computer through a serial port as shown in Fig 2-3-2 Note: After connecting the drive to be tested, load TEST program in accordance with section 5- 3-3-1-2 Battery Monitor...
  • Page 22 A/D data does not satisfy the specification, check DC-DC output voltage and battery monitor circuit. 3-3-1-3 Function Check a. Insert a Audio Test Disc (TGYS-1) to the unit. b. Execute the check procedure from 3-5-2 (Status Check) to 3-5-10 (Read TOC/UTOC). Note: If no trouble can be found, IC705 (CXD1805AR) or IC707 (CXD2927R) is defective.
  • Page 23 b. Set the switches on the unit as below. Power / Mode Select : Audio AVLS : off c. Connect the AC adapter and insert a Audio Test Disc (TGYS-1) to the unit. d. Start playing track 1 (1kHz 0DB L&R) using the remote controller. e.
  • Page 24 Type ATPMD and Enter key. (After test program loading, Display 3-4-1(a) shows up.) Note: If the SCSI ID is not set to ID 3, use "-I<id>" option with ATPMD. ex.: ATPMD -I1 Display 3-4-1(a) ATP for MD DATA (ver x.xx) (C) Copyright SONY Corp. 1994 INQUIRY Vendor : SONY Product : MDH-10 Version : x.xx...
  • Page 25 Please Insert Test Disc b. Insert Re-Writable Adj. Disc to the unit under test. And the result (OK or NG) of each test item on the Test Result column will appear as below. Note: If any of error occurs during ATP, Display 3-4-1(e) shows up. Display 3-4-1(d) Read Capacity Test Disc Capacity xxxxx blocks (xxxx bytes/block)
  • Page 26 Display 3-4-1(f) Please eject Test Disc. Display 3-4-1(g) Please Insert Audio Test Disc. d. Put a headphone and insert Audio Test Disc (TGYS-1) to the unit under test. And playing audio starts. Then set volume so that it centers. Display 3-4-1(h) Does any sound play back? ([Y]/N) e.
  • Page 27 Test Items Check Point Remarks Check if it has doubled 1. SCSI ID No. SCSI ID No. on the same SCSI line. 2. SCSI Termination Inquiry 3. Cable connection 4. Voltage Output Refer to 5. Others Refer to Read Only Disc Request sense 1.
  • Page 28 Test Items Check Point Remarks 14. Disc in/Disc Protection/ Reflection switch (Ref. no. S701/S702/S703) - Refer to 3-5-3 Mech-Con PCB) Re-Writable Disc 1. RF Signal Refer to 5-2-8 Read capacity 2. Tracking Servo Loop Gain Refer to 5-2-7 TOC read UTOC Rezero Waveform check (Refer...
  • Page 29 3-5-2 Status Check a. Execute 19: Drive Status and check whether the unit respond normally. b. Type s t s and push RETURN to see the drive status information continuously on top of the screen. Note: In case of no response from the unit, MAM Mounted Board is faulty.
  • Page 31 3-5-3 Disc ID Switches a. Insert a Read Only Disc (TGYS-9001) into the drive.
  • Page 32 b. Check the drive status by 19: Drive Status command or by indications on the status bar on top of the screen. Table below shows the normal status condition. c. Eject a Read Only Disc (TGYS-9001). Then insert a Re-Writable Adj. Disc with the disc protection closed (writable).
  • Page 33 Note: If failed, the 2 axis actuator on the Optical device, the driver IC (PWM amp.), the Tracking offset and EF balance adjustment, gain adjustment, or the MAM mounted board is faulty. 3-5-7 Spin Up a. Execute 3: STOP if Focusing or Tracking is on. Spin up the unit by executing 2: Spin Up command.
  • Page 34 switch.) Recommend not using the standard test disc because the reference data written on the disc is destroyed in case of failure. b. After spinning up or seeking, execute 9: Write Cluster command at any address between cluster 100 and the Read-Out Area start address. The address less than cluster 99 is normally used for the UTOC and the alternation clusters for defective area.
  • Page 35 Connect a probe of an oscilloscope (storage type recommended) to AP5070 [FE-O}. Set trigger DC coupling with 2.0V level, positive and normal. a-2. Insert a Re-Writable Adj. Disc. Move the Optical Device out by 100 steps with the 16: Step Out command.
  • Page 36 Execute 13: Focus ON/OFF command after setting Byte 05 to 01 (01 means Focus on) in parameter window. b-4. The oscilloscope shows the traverse signal; the tracking error signal while crossing over many tracks due to eccentricity of the disc (Refer to 5-2-5). The peak to peak voltage level of the traverse signal should be more than 1.5 Vp-p.
  • Page 37 d-3. Execute 5: Seek with appropriate cluster address (50 for the standard test disc). d-4. 24.8khz sinusoidal waveform is observed. Because the signal is modulated with address data in FM, the modulation jitters are included. Peak to peak voltage level of the signal is around 0.4 Vp-p, but the amplitude varies due to influence from adjacent tracks.
  • Page 38 Re-writable disc Pit 1 (high) 0 (low) Re-writable disc Groove 0 (low) 0 (low) 3-5-16 Write Signal a. Insert a Re-Writable Adj. Disc which is not write protected. (note: Never change the disc write protection while disc is in the unit. It will break a detection switch.) Recommend not using the standard test disc because the reference data written on the disc is destroyed in case of failure.

  • Page 39: Section 4 Parts Replacement

    SECTION 4 PARTS REPLACEMENT 4-1 UPPER PANEL AND REAR/BOTTOM PANEL ASS'Y REPLACEMENT a. Remove the six screws (M1.4x2.5 Special Head/black) securing the Upper Panel and Rear Panel Ass'y. They are taken away. (Refer to Fig. 4-1) b. Remove the five screws (M1.4x2.5 Special Head/black) securing the Bottom Panel Ass'y. It is taken away.
  • Page 40 4-2 ORNAMENTAL BELT ASS'Y REPLACEMENT a. Spread out Ornamental Belt Ass'y and dislocated it from the frame. (Refer to Fig. 4-2) Note: When Installing, follow next steps. Carefully attach front portion to the unit so that OPEN switch knob is located in proper position and works smoothly.

  • Page 41: Dc-Dc Converter Replacement

    b. Unlock the CN801, CN802 and CN803 as shown in Fig. 4-3 and disconnect all the flexible cables (CN801 for DC-DC converter, CN802 for REC mounted board ass'y, CN803 for mech con mounted board ass'y) c. Remove the four screws (M1.4x2 Toothed Lock/light gold) securing the MAM Mounted Board to the frame.
  • Page 42 Note: When installing, secure it with torque force of 9.8N·cm (1kgf·cm). 4-6 MECHANICAL DECK (MECH DECK) COVER ASS'Y REPLACEMENT Note: After the removal of the Mech Deck Cover Ass'y, do not apply excessive force to the Head arm or Head own because Head arm is easily damaged.
  • Page 43 Note: When installing, match the two bosses on the Front Frame Ass'y to two openings on the Rear Frame Ass'y. Note: When installing, secure it with torque force of 9.8N·cm (1kgf·cm). c. Remove the two screws (M1.4x2.5 Special Head/black) securing the Battery Case Ass'y. (Refer to Fig.
  • Page 44 4­8­1 REC Flexible Cable and MD Flexible Cable  a. Disconnect the REC Flexible Cable from CN901 connector (for REC mounted board) and  then carefully peel it off from MD Flexible Cable. (Refer to 4‐8(a))  Note: When installing, peel off the paper on the MD Flexible Cable. Attach REC Flexible Cable  on the MD Flexible Cable.   b. Disconnect the MD Flexible Cable from CN901 connector (for Mech Con mounted board)  and then peel off the MD Flexible Cable from the Mech Deck. (Refer to 4‐8(a))  Note: When installing, peel off the paper on the MD Flexible Cable. Attach REC Flexible Cable  on the Sled Motor Block Ass'y.        4­8­2 OP Head Ass'y  Note: Through the installation (removal) of OP Head Ass'y, do not apply excessive force to the  Head arm or Head own because Head arm is easily damaged.  Note: When the OP Head Ass'y replaced with new one, certainly attach the Cover Sheet and  Pack Insulation Sheet as shown in Fig. 4‐8(c).   a. Remove the screw (P1.4x1.4/black) securing the head guard and remove the screw  (P1.4x1.4/black) securing the under guard. They can be taken away. (Refer to Fig. 4‐8(b))  Note: When installing, secure it with torque force of 7.8N∙cm (0.8kgf∙cm).  ...
  • Page 45 b. Disconnect the flexible cable from CN902 connector (for REC mounted board).  c. Remove the two screws (P1.4x3/black) securing the shaft (guide A) and remove the OP  Head Ass'y backwards while lifting head arm. (Refer to Fig. 4‐8(c))  Note: When installing, secure it with torque force of 7.8N∙cm (0.8kgf∙cm).  Note: Before installing, apply Sankol Grease (FG‐84M) to the Lead Screw and the shaft (guide  B). (Refer to Fig. 4‐8(c))      4­8­3 Gear (Worm Wheel) and Mechanical Compartment (Mech Con) Mounted Board  a. Remove the Washer from shaft with Tweezers and then pull the Gear (Worm Wheel) up.  (Refer to Fig. 4‐8(d)) ...
  • Page 46 Note: Before installing, apply Diamond Oil (NT‐68) to the chassis. (Refer to Fig. 4‐8(d))  Note: When attaching the Gear (Worm Wheel), while pulling the lever direction marked with  arrow 1, install it.   b. Disconnect the flexible cable from CN702 connector (for Stepper Motor).  c. Desolder CLV flexible cable on the Mech Con Mounted Board and flexible cable of sled  motor with soldering iron.  d. Remove the three screws (P1.4x1.4/black) securing the Mech Con Mounted Board and  then remove the Mech Con Mounted Board. (Refer to Fig. 4‐8(d))  Note: When installing, secure it with torque force of 9.8N∙cm (1kgf∙cm).  Note: Before installing, apply Sankol Grease (FG‐84M) to the Lever (operating) Ass'y. (Refer to  Fig. 4‐8(d))  Note: When installing the Mech Con Mounted Board, while pushing lever direction marked  with arrow 4, install it.    4­8­4 Motor  a. Remove the three screws (P1.7x1.6/black) securing the Motor and then pull it straight  up. (Refer to Fig. 4‐8(d))  Note: When installing, secure it with torque force of 9.8N∙cm (1kgf∙cm).  Note: When the Motor is replaced with new one, certainly attach the cushion on the Motor.  ...
  • Page 47     4­8­5 Gear Chassis Block Ass'y  a. Remove the two screws (P1.7x1.6/black) securing the Gear Chassis Block Ass'y and then  remove the Gear Chassis Block Ass'y. (Refer to Fig. 4‐8(e))  Note: When installing, secure it with torque force of 9.8N∙cm (1kgf∙cm).   b. Remove the Stopper Washer from the shaft with Tweezers and then pull the Worm Gear  and Compression Spring up. (Refer to Fig. 4‐8(e))  Note: Before installing, apply Diamond Oil (NT‐68) to the shaft of Gear Chassis Block Ass'y.  (Refer to Fig. 4‐8(e))   c. Remove the two screws (P1.2x1.6/black) securing the Stepper Block Ass'y and then  remove the Stepper Block Ass'y. (Refer to Fig. 4‐8(e))  Note: When installing, secure it with torque force of 8N∙cm (.6kgf∙cm).  ...
  • Page 48 4­8­6 Sled Motor Block Ass'y  a. Remove the three screws (P1.4x3/black) securing the Bracket (S) Ass'y and then remove  the Bracket (S) Ass'y. (Refer to Fig. 4‐8(e))  Note: When installing, secure it with torque force of 7.8N∙cm (0.8kgf∙cm).   b. Remove the two screws (P1.4x4.5/black) securing the Sled Block Ass'y can be taken  away the Sled Motor Block Ass'y, Lead Screw Block Ass'y, and Gear (B). (Refer to Fig. 4‐ 8(e))  Note: Before installing, apply Diamond Oil (NT‐68) to the shaft Bracket (S) Ass'y and apply  Sankol Grease (FG‐84M) to the Lead Screw Block Ass'y. (Refer to Fig. 4‐8(e))        4­8­7 Holder Ass'y  a. Remove the screw (M1.4x1.6 Special Head/black) securing the Holder Ass'y. (Refer to  Fig. 4‐8(f))  Note: When installing, secure it with torque force of 7.8N∙cm (0.8kgf∙cm).  ...
  • Page 49 b. Remove the Stopper Washer located right rear of the Mech Deck from the shaft with  Tweezers and then shift it left side and it can be taken away. (Refer to Fig. 4‐8(f))    4­8­8 REC Mounted Board Ass'y a. Remove the screw (M1.4x1.4 Special Head/black) securing the REC Mounted Board  Ass'y. (Refer to Fig. 4‐8(f))  Note: When installing, secure it with torque force of 7.8N∙cm (0.8kgf∙cm).        ...