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SONY HCDR770
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY HCDR770 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Table of Contents
    1. SERVICING NOTES
    2. GENERAL
    • Location of Controls
    • Setting the Time
    1. DISASSEMBLY
    2. TEST MODE
    3. MECHANICAL ADJUSTMENTS
    4. ELECTRICAL ADJUSTMENTS
    • DECK Section
    • CD Section
    1. DIAGRAMS
      1. Block Diagram - CD SERVO Section
      2. Block Diagram - TAPE DECK Section
      3. Block Diagram - MAIN Section
      4. Block Diagram - DISPLAY/KEY CONTROL/POWER SUPPLY Section
      5. Note for Printed Wiring Boards and Schematic Diagrams
      6. Printed Wiring Board - BD Board
      7. Schematic Diagram - BD Board
      8. Printed Wiring Boards - CD MOTOR Section
      9. Schematic Diagram - CD MOTOR Section
      10. Printed Wiring Board - AUDIO Board
      11. Schematic Diagram - AUDIO Board
      12. Printed Wiring Board - LEAF SW Board
      13. Schematic Diagram - LEAF SW Board
      14. Printed Wiring Board - MAIN Board
      15. Schematic Diagram - MAIN Board (1/4)
      16. Schematic Diagram - MAIN Board (2/4)
      17. Schematic Diagram - MAIN Board (3/4)
      18. Schematic Diagram - MAIN Board (4/4)
      19. Printed Wiring Board - PANEL Board
      20. Schematic Diagram - PANEL Board
      21. Printed Wiring Board - CD SW Board
      22. Schematic Diagram - CD SW Board
      23. Printed Wiring Board - TRANSFORMER Section
      24. Schematic Diagram - TRANSFORMER Section
      25. IC Pin Function Description
    2. EXPLODED VIEWS
    3. ELECTRICAL PARTS LIST
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Text excerpt from page 17 (click to view)
CD SECTION
Note: 1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10 MΩ impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

E-F Balance (1 Track Jump) Check
oscilloscope BD board TP (TE) TP (VC)
+ –

S-Curve Check
oscilloscope BD board TP (FE) TP (VC)
+ –

Procedure : 1. Connect oscilloscpe to TP (TE) and TP (VC). 2. Turn the power ON. 3. Load a disc (YEDS-18) and playback the number five track. 4. Press the ^ (CD) button. (Becomes the 1 track jump mode) 5. Confirm that the level B and A (DC voltage) on the oscilloscope waveform.
1 track jump waveform

Procedure: 1. Connect oscilloscope to TP (FE). 2. 3. 4. 5. Connect between TP (FE1) and TP (VC) by lead wire. Connect between TP (AGCCON) and TP (GND) by lead wire. Turn the power ON. Load a disc (YEDS-18) and actuate the focus search. (In consequence of open and close the disc tray, actuate the focus search) 6. Cofirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 4 ± 1 Vp-p.
S-curve waveform
symmetry

center of waveform B 0V A (DC voltage)

level = 1.3 ± 0.6 Vp-p

symmetry

A Specified level: B × 100 = less than ± 22%

6. After check, remove the lead wire connected in step 1.
A within 4 ± 1 Vp-p B

7. After check, remove the lead wire connected in step 2 and 3.
Note: • Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7. • Take sweep time as long as possible and light up the brightness to obtain best waveform.

RF Level Check
oscilloscope BD board TP (RF) TP (VC) + –

Procedure: 1. Connect oscilloscope to TP (RF). 2. Connect between TP (AGCCON) and TP (GND) by lead wire. 3. Turn the power ON. 4. Load a disc (YEDS-18) and playback. 5. Confirm that the oscilloscope waveform is clear and check RF signal level is correct or not. 6. After check, remove the lead wire connected in step 2.
Note: Clear RF signal waveform means that the shape “≈” can be clearly distinguished at the center of the waveform.

VOLT/DIV: 200 mV TIME/DIV: 500 ns

level: 1.45 ± 0.3 Vp-p

– 17 –

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