CFD-S26 - Sony Audio Service Manual (repair manual). Page 3

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TABLE OF CONTENTS
1. SERVICING NOTES
......................................................... 4
2. GENERAL
............................................................................ 7
3. DISASSEMBLY
3-1.   Cabinet (Front) Sub Assy .................................................... 8
3-2.   Wires ................................................................................... 9
3-3.   Power (1) Board, Power (2) Board ...................................... 9
3-4.   Voltage Select Board ......................................................... 10
3-5.   Cabinet (Upper) Assy ........................................................ 10
3-6.   Main Board ....................................................................... 11
3-7.   CD Mechanism Block ....................................................... 11
3-8.   Tape Mechanism Block ..................................................... 12
3-9.   Holder Assy, Cassette ........................................................ 12
3-10. PRE Board ......................................................................... 13
3-11. Belt, M801 (Capstan/Reel Motor),
HRP301 (Head, Magnetic) ................................................ 13
3-12. Optical Pick-up ................................................................. 14
4. MECHANICAL ADJUSTMENTS
............................... 15
5. ELECTRICAL ADJUSTMENTS
Tape Section .......................................................................... 15
Tuner Section ......................................................................... 16
CD Section ............................................................................ 17
6. DIAGRAMS
6-1.   IC Pin Description ............................................................. 18
6-2.   Circuit Boards Location .................................................... 19
6-3.   Block Diagram – CD Section (Former Type) – ................ 20
6-4.   Block Diagram – Main Section (Former Type) – .............. 21
6-5.   Printed Wiring Board – CD Section (Former Type) – ....... 22
6-6.   Schematic Diagram – CD Section (Former Type) – ......... 23
6-7.   Printed Wiring Boards – Main Section (Former Type) – .. 24
6-8.   Schematic Diagram – Main Section (1/4) (Former Type) – .. 25
6-9.   Schematic Diagram – Main Section (2/4) (Former Type) – .. 26
6-10. Schematic Diagram – Main Section (3/4) (Former Type) – .. 27
6-11. Schematic Diagram – Main Section (4/4) (Former Type) – .. 28
6-12. Printed Wiring Boards – Control Section (Former Type) – ... 29
6-13. Schematic Diagrams – Control Section (Former Type) – ...... 30
6-14. Printed Wiring Boards – Power Supply Section (Former Type) – .. 31
6-15. Schematic Diagrams – Power Supply Section (Former Type) – .... 32
6-16. Block Diagram – CD Section (New Type) – ..................... 33
6-17. Block Diagram – Main Section (New Type) – .................. 34
6-18. Printed Wiring Board – CD Section (New Type) – ........... 35
6-19. Schematic Diagram – CD Section (New Type) – .............. 36
6-20. Printed Wiring Boards – Main Section (New Type) – ...... 37
6-21. Schematic Diagram – Main Section (1/4) (New Type) – .. 38
6-22. Schematic Diagram – Main Section (2/4) (New Type) – .. 39
6-23. Schematic Diagram – Main Section (3/4) (New Type) – .. 40
6-24. Schematic Diagram – Main Section (4/4) (New Type) – .. 41
6-25. Printed Wiring Boards – Control Section (New Type) – ... 42
6-26. Schematic Diagrams – Control Section (New Type) – ..... 43
6-27. Printed Wiring Boards – Power Supply Section (New Type) – .. 44
6-28. Schematic Diagrams – Power Supply Section (New Type) – .... 45
7. EXPLODED VIEWS
7-1.   Cabinet (Front) Section ..................................................... 48
7-2.   Cabinet (Rear) Section ...................................................... 49
7-3.   Cabinet (Upper) Section .................................................... 50
7-4.   Tape Mechanism Section-1 ............................................... 52
7-5.   Tape Mechanism Section-2 ............................................... 53
7-6.   Optical Pick-up Section .................................................... 54
8. ELECTRICAL PARTS LIST
......................................... 55
CFD-S26
To Exposed Metal
Parts on Set
0.15µF
1.5k
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY  CHECK-OUT (US model)
After correcting the original service problem, perform the following
safety check 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 TEST
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 microamperes).
Leakage 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 passive
VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
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