Read Sony HCD-GRX90AV / HCD-RXD10AV / MHC-GRX90AV Service Manual online
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TABLE OF CONTENTS
1. SERVICING NOTE
.......................................................... 5
2. GENERAL
.......................................................................... 6
3. DISASSEMBLY
3-1. Loading Panel ....................................................................... 8
3-2. Front Panel ............................................................................ 8
3-3. Cassette Lid and Tape Mechanism ........................................ 9
3-4. CD SW Board and Panel Board ............................................ 9
3-5. Disc Tray ............................................................................. 10
3-2. Front Panel ............................................................................ 8
3-3. Cassette Lid and Tape Mechanism ........................................ 9
3-4. CD SW Board and Panel Board ............................................ 9
3-5. Disc Tray ............................................................................. 10
4. SERVICE MODE
............................................................ 11
5. MECHANICAL ADJUSTMENTS
..........................
14
6. ELECTRICAL ADJUSTMENTS
............................... 14
7. DIAGRAMS
7-1. Circuit Boards Location ...................................................... 18
7-2. Block Diagrams
7-2. Block Diagrams
• CD Section ....................................................................... 19
• Deck Section .................................................................... 21
• Main Section .................................................................... 23
• Main Power/Sub Power Section ...................................... 25
• Display Section ................................................................ 27
• Deck Section .................................................................... 21
• Main Section .................................................................... 23
• Main Power/Sub Power Section ...................................... 25
• Display Section ................................................................ 27
7-3. Printed Wiring Board – BD (CD) Section – ....................... 31
7-4. Schematic Diagram – BD (CD) Section – .......................... 33
7-5. Printed Wiring Board – Main Section – .............................. 35
7-6. Schematic Diagram – Main (1/4) Section – ........................ 37
7-7. Schematic Diagram – Main (2/4) Section – ........................ 39
7-8. Schematic Diagram – Main (3/4) Section – ........................ 41
7-9. Schematic Diagram – Main (4/4) Section – ........................ 43
7-10. Printed Wiring Board – Leaf SW Section – ..................... 45
7-11. Schematic Diagram – Leaf SW Section – ........................ 45
7-12. Schematic Diagram – Deck Section – .............................. 47
7-13. Printed Wiring Board – Deck Section – ........................... 49
7-14. Schematic Diagram – Front Panel Section – .................... 51
7-15. Printed Wiring Board – Front Panel Section – ................. 53
7-16. Printed Wiring Board – Panel Section – ........................... 55
7-17. Schematic Diagram – Panel (1/2) Section – ..................... 57
7-18. Schematic Diagram – Panel (2/2) Section – ..................... 59
7-19. Schematic Diagram – Surround Section – ....................... 61
7-20. Printed Wiring Board – Surround Section – ..................... 62
7-21. Schematic Diagram – CD Motor Section – ...................... 63
7-22. Printed Wiring Board – CD Motor Section – ................... 65
7-23. Schematic Diagram – Trans Section – ............................. 67
7-24. Schematic Diagram – Sub Trans Section – ...................... 69
7-25. Printed Wiring Board – Trans Section – ........................... 71
7-26. Printed Wiring Board – Sub Trans Section – ................... 72
7-27. IC Block Diagrams ........................................................... 73
7-28. IC Pin Functions ............................................................... 74
7-4. Schematic Diagram – BD (CD) Section – .......................... 33
7-5. Printed Wiring Board – Main Section – .............................. 35
7-6. Schematic Diagram – Main (1/4) Section – ........................ 37
7-7. Schematic Diagram – Main (2/4) Section – ........................ 39
7-8. Schematic Diagram – Main (3/4) Section – ........................ 41
7-9. Schematic Diagram – Main (4/4) Section – ........................ 43
7-10. Printed Wiring Board – Leaf SW Section – ..................... 45
7-11. Schematic Diagram – Leaf SW Section – ........................ 45
7-12. Schematic Diagram – Deck Section – .............................. 47
7-13. Printed Wiring Board – Deck Section – ........................... 49
7-14. Schematic Diagram – Front Panel Section – .................... 51
7-15. Printed Wiring Board – Front Panel Section – ................. 53
7-16. Printed Wiring Board – Panel Section – ........................... 55
7-17. Schematic Diagram – Panel (1/2) Section – ..................... 57
7-18. Schematic Diagram – Panel (2/2) Section – ..................... 59
7-19. Schematic Diagram – Surround Section – ....................... 61
7-20. Printed Wiring Board – Surround Section – ..................... 62
7-21. Schematic Diagram – CD Motor Section – ...................... 63
7-22. Printed Wiring Board – CD Motor Section – ................... 65
7-23. Schematic Diagram – Trans Section – ............................. 67
7-24. Schematic Diagram – Sub Trans Section – ...................... 69
7-25. Printed Wiring Board – Trans Section – ........................... 71
7-26. Printed Wiring Board – Sub Trans Section – ................... 72
7-27. IC Block Diagrams ........................................................... 73
7-28. IC Pin Functions ............................................................... 74
8. EXPLODED VIEWS
8-1. Case Section ........................................................................ 77
8-2. Chassis Section ................................................................... 78
8-3. Front Panel Section ............................................................. 79
8-4. CD Mechanism Deck Section-1 (CDM38LH-5BD32L) .... 80
8-5. CD Mechanism Deck Section-2 (CDM38LH-5BD32L) .... 81
8-6. Base Unit Section (BU-5BD32L) ....................................... 82
8-7. TC Mechanism Section-1 (TCM230AWR2/230PWR2) .... 83
8-8. TC Mechanism Section-2 (TCM230AWR2/230PWR2) .... 84
8-2. Chassis Section ................................................................... 78
8-3. Front Panel Section ............................................................. 79
8-4. CD Mechanism Deck Section-1 (CDM38LH-5BD32L) .... 80
8-5. CD Mechanism Deck Section-2 (CDM38LH-5BD32L) .... 81
8-6. Base Unit Section (BU-5BD32L) ....................................... 82
8-7. TC Mechanism Section-1 (TCM230AWR2/230PWR2) .... 83
8-8. TC Mechanism Section-2 (TCM230AWR2/230PWR2) .... 84
9. ELECTRICAL PARTS LIST
........................................ 85
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
0.15
µ
F
To Exposed Metal
Parts on Set
Parts on Set
1.5k
Ω
AC
voltmeter
(0.75V)
voltmeter
(0.75V)
Earth Ground
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