CFD-C1000 - Sony Audio Service Manual (repair manual). Page 3

– 3 –

To Exposed Metal
Parts on Set

0.15µF

1.5k

Ω

AC
voltmeter
(0.75V)

Earth Ground

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.

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)

Playing a CD ........................................................................... 4
Listening to the radio ............................................................... 4
Playing a tape .......................................................................... 5
Recording on a tape ................................................................. 5

2-1.   Top Assy, Cabinet and Rear Assy, Cabinet ......................... 6
2-2.   Power Board ........................................................................ 6
2-3.   Changer Assy, CD ............................................................... 7
2-4.   Mechanism Deck Block ...................................................... 7
2-5.   Main Board ......................................................................... 8
2-6.   LCD Board .......................................................................... 8
2-7. CD Lamp Board and Disc Board and Display Board ......... 9
2-8.   Base, Changer ..................................................................... 9
2-9.   Optical Pick-up ................................................................. 10

............................... 11

Tape Section .......................................................................... 11
Tuner Section ......................................................................... 13
CD Section ............................................................................ 14

5-1.   IC Pin Description ............................................................. 15
5-2.   Circuit Boards Location .................................................... 16
5-3.   Block Diagram –CD Section– ........................................... 17
5-4.   Block Diagram –Main Section– ........................................ 19
5-5.   Printed Wiring Boards –Key Section– .............................. 21
5-6.   Schematic Diagram –Key Section– ................................... 23
5-7.   Printed Wiring Board –Audio Section– ............................ 25
5-8.   Schematic Diagram –Audio Section– ............................... 27
5-9.   Printed Wiring Boards –CD Section– ............................... 29
5-10. Schematic Diagram –CD Section– .................................... 31
5-11. Printed Wiring Boards –Control Section– ......................... 33
5-12. Schematic Diagram –Control Section– ............................. 35
5-13. Printed Wiring Boards –Power Supply Section– .............. 37
5-14. Schematic Diagram –Power Supply Section– ................... 39
5-15. Schematic Diagram –Tuner Section– ................................ 41

6-1.   Rear Cabinet Section ......................................................... 48
6-2.   Front Cabinet Section-1 .................................................... 49
6-3.   Front Cabinet Section-2 .................................................... 50
6-4.   CD Changer Section-1 ...................................................... 51
6-5.   CD Changer Section-2 ...................................................... 52
6-6.   Tape Mechanism Deck Section-1 ...................................... 53
6-7.   Tape Mechanism Deck Section-2 ...................................... 54
6-8.   Tape Mechanism Deck Section-3 ...................................... 55
6-9.   Optical Pick-up Section .................................................... 56
6-10. Speaker Section ................................................................. 57

......................................... 58