Servicing Note - Sony MZ-R55 Service Manual

1. GENERAL
....................................................................... 4
2. SELF-DIAGNOSTIC
2-1. General ..................................................................... 5
2-2. Test Mode Setting ..................................................... 5
2-3. Operation in Test Mode Setting ................................ 5
2-4. Releasing the Test Mode ........................................... 5
2-5. Self-Diagnostic Mode ............................................... 5
2-6. Clearing the Error Indication Code
and Total Recording Time ........................................ 6
3. DISASSEMBLY
3-1. Bottom Panel Assy ................................................... 7
3-2. Connector ................................................................. 7
3-3. Upper Panel Block Assy ........................................... 8
3-4. LCD Block Assy ....................................................... 8
3-5. Ornamental Belt Block Assy .................................... 9
3-6. Main Board ............................................................... 9
3-7. Chassis (Main) Assy ............................................... 10
3-8. OP Block Assy ........................................................ 10
3-9. Holder Assy ............................................................ 11
1) When repairing this device with the power on, if you remove
the main board or open the upper panel assy, this device stops
working.
In this case, you can work without the device stopping by
fastening the hook of the DOOR OPEN switch (S801) with tape.
2) This set is designed to perform automatic adjustment for each
adjustment and write its value to EEPROM. Therefore, when
EEPROM (IC801) has been replaced in service, be sure to per-
form automatic adjustment and write resultant values to the new
EEPROM.
Refer to page 12 for details.
TABLE OF CONTENTS
4. TEST MODE
4-1. General ................................................................... 12
4-2. Test Mode Setting ................................................... 12
4-3. Test Mode Structure ............................................... 12
4-4. Manual Mode ......................................................... 12
4-5. Overall Adjustment Mode ...................................... 15
4-6. Hybrid Mode, Key Check Mode ............................ 16
5. ELECTRICAL ADJUSTMENTS
6. DIAGRAMS
6-1. IC Pin Descriptions ................................................ 21
6-2. Block Diagram - Servo Section - .......................... 25
6-3. Block Diagram - Audio Section - .......................... 27
6-4. Block Diagram - System Control Section - ........... 29
6-5. Printed Wiring Board (-11) ..................................... 31
6-6. Printed Wiring Board (-12) ..................................... 34
6-7. Printed Wiring Board (-13) ..................................... 37
6-8. Schematic Diagram - Main Section (1/3) - ........... 40
6-9. Schematic Diagram - Main Section (2/3) - ........... 43
6-10. Schematic Diagram - Main Section (3/3) - ........... 46
7. EXPLODED VIEWS
7-1. Panel Section .......................................................... 54
7-2. Chassis Section ....................................................... 55
7-3. Mechanism Deck Section ....................................... 56
8. ELECTRICAL PARTS LIST

SERVICING NOTE

tape
S801
- 3 -
........................... 17
................................... 57
upper panel assy
MAIN board