Table Of Contents - Sony HCD-MD333 - Hi Fi Cd/minidisc Component Service Manual

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.
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
WT-540A. Follow the manufacturers' instructions to use these
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)
To Exposed Metal
Parts on Set
0.15 F
1.5k
Fig. A. Using an AC voltmeter to check AC leakage.
AC
voltmeter
(0.75V)
Earth Ground

TABLE OF CONTENTS

1. SERVICING NOTE
2. GENERAL
.......................................................................... 8
3. DISASSEMBLY
3-1. Case .................................................................................... 10
3-2. Front Panel/MD Mechanism Deck Section ........................ 10
3-3. Back Panel, Jack Board ....................................................... 11
3-4. MD Mechanism Deck (MDM-3D) ..................................... 11
3-5. CD Mechanism Deck (CDM13C-5BD19).......................... 12
3-6. BD (MD) Board .................................................................. 12
3-7. Disc Table .......................................................................... 13
3-8. Sub Chassis ......................................................................... 13
3-9. Optical Pick-up (KSS-213B/K-N) ...................................... 14
3-10. Over Write Head ............................................................... 14
3-11. Slider Complete ASSY ...................................................... 15
3-12. Shutter ASSY .................................................................... 16
4. SERVICE MODE
5. TEST MODE
..................................................................... 18
6. ELECTRICAL ADJUSTMENTS
7. DIAGRAMS
7-1. Circuit Boards Location ...................................................... 31
7-2. Block Diagrams
• CD Section ....................................................................... 33
• MD Section ...................................................................... 35
• Main Section .................................................................... 37
7-3. Schematic Diagram - CD Section - ................................... 41
7-4. Printed Wiring Board - CD Section - ................................. 43
7-5. Schematic Diagram - MD (1/3) Section - .......................... 45
7-6. Schematic Diagram - MD (2/3) Section - .......................... 47
7-7. Schematic Diagram - MD (3/3) Section - .......................... 49
7-8. Printed Wiring Board - MD Section - ................................ 51
7-9. Schematic Diagram - MD Switch Section - ...................... 53
7-10. Printed Wiring Board - MD Switch Section - ................. 54
7-11. Schematic Diagram - Main (1/3) Section - ..................... 55
7-12. Schematic Diagram - Main (2/3), (3/3) Section - ........... 57
7-13 Printed Wiring Board - Main Section - ........................... 59
7-14. Schematic Diagram - Audio Section - ............................. 61
7-15. Printed Wiring Board - Audio Section - .......................... 63
7-16. Schematic Diagram - Panel Section - ............................. 65
7-17. Printed Wiring Board - Panel Section - ........................... 67
7-18. Schematic Diagram - Jack Section - ............................... 69
7-19. Printed Wiring Board - Jack Section - ............................ 71
7-20. Schematic Diagram - ST Terminal/Loading Section - .... 73
7-21. Printed Wiring Board - ST Terminal/Loading Section - . 74
7-22. Schematic Diagram - Trans Section - ............................. 75
7-23. Printed Wiring Board - Trans Section - ........................... 76
7-24. Schematic Diagram - Power AMP Section - ................... 77
7-25. Printed Wiring Board - Power AMP Section - ................ 79
7-26. IC Block Diagrams ........................................................... 81
7-27. IC Pin Functions ............................................................... 88
8. EXPLODED VIEWS
8-1. Front Panel Section ............................................................. 96
8-2. Chassis Section ................................................................... 97
8-3. MD Mechanism Deck Section-1 (MDM-3J) ...................... 98
8-4. MD Mechanism Deck Section-2 (MDM-3J) ...................... 99
8-5. CD Mechanism Deck Section-1 (CDM13C-5BD19) ....... 100
8-6. CD Mechanism Deck Section-2 (BU-5BD19) ................. 100
9. ELECTRICAL PARTS LIST
- 6 -
.......................................................... 7
............................................................. 17
............................... 24
...................................... 102