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COMPONENTS  IDENTIFIED  BY  MARK  0  OR  DOTTED  LINE
WITH  MARK  0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN
THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE  OPERATION.
REPLACE  THESE  COMPONENTS  WITH  SONY  PARTS  WHOSE
PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS  MANUAL  OR
IN  SUPPLEMENTS  PUBLISHED  BY  SONY.

Power output

2.3 W + 2.3 W (at 3.2 ohms, 10 %
harmonic distortion in AC operation)

Power requirements

For CD radio cassette-corder:
    120 V AC, 60 Hz
9 V DC, 6 size D (R20) batteries
For remote control
3 V DC, 2 size AA (R6) batteries

Power consumption

AC 20 W

Battery life

For CD radio cassette-corder:

Sony R20P: approx. 13.5 h

Sony alkaline LR20: approx. 20 h
Tape playback

Sony R20P: approx. 7.5 h

Sony alkaline LR20: approx. 15 h
CD playback

Sony R20P: approx. 2.5 h

Sony alkaline LR20: approx. 7 h

Dimensions

Approx. 420 

× 159 × 284 mm (w/h/d)

(16 

5/8

 

× 6 

3/8

 

× 11 

1/4

 inches) (incl. projecting parts)

Mass

Approx. 3.8 kg (8 lb. 6 oz.) (incl. batteries)

Supplied accessories

AC power cord (1)
Remote control RMT-CS36WA (1)

Design and specifications are subject to change without
notice.

Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.

Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270˚C during

repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

Notes on Chip Component Replacement
• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.

NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

3

......................................................... 4

Location of controls ................................................................. 5

3-1.   Cabinet (Front) Sub Assy .................................................... 6
3-2.   Wires ................................................................................... 7
3-3.   Power (1) Board, Power (2) Board ...................................... 7
3-4.   Cabinet (Upper) Assy .......................................................... 8
3-5.   Main Board ......................................................................... 8
3-6.   CD Mechanism Block ......................................................... 9
3-7.   Tape Mechanism Block ....................................................... 9
3-8.   Holder Assy, Cassette ........................................................ 10
3-9.   PRE Board ......................................................................... 10
3-10. Belt, M801 (Capstan/Reel Moter),

HRP301 (Head, Magnetic) ................................................ 11

3-11. Optical Pick-up ................................................................. 11

............................... 12

Tape Section .......................................................................... 12
Tuner Section ......................................................................... 13
CD Section ............................................................................ 14

6-1.   IC Pin Description ............................................................. 15
6-2.   Circuit Boards Location .................................................... 15
6-3.   Block Diagram – CD Section – ......................................... 16
6-4.   Block Diagram – Main Section – ...................................... 17
6-5.   Printed Wiring Board – CD Section – ............................... 18
6-6.   Schematic Diagram – CD Section – .................................. 19
6-7.   Printed Wiring Boards – Main Section – .......................... 20
6-8.   Schematic Diagram – Main Section (1/4) – ...................... 21
6-9.   Schematic Diagram – Main Section (2/4) – ...................... 22
6-10. Schematic Diagram – Main Section (3/4) – ...................... 23
6-11. Schematic Diagram – Main Section (4/4) – ...................... 24
6-12. Printed Wiring Boards – Control Section – ....................... 25
6-13. Schematic Diagrams – Control Section – ......................... 26
6-14. Printed Wiring Boards – Power Supply Section – ............ 27
6-15. Schematic Diagrams – Power Supply Section – ............... 28

7-1.   Cabinet (Front) Section ..................................................... 32
7-2.   Cabinet (Rear) Section ...................................................... 33
7-3.   Cabinet (Upper) Section .................................................... 34
7-4.   Tape Mechanism Section-1 ............................................... 35
7-5.   Tape Mechanism Section-2 ............................................... 36
7-6.   Optical Pick-up Section .................................................... 37

......................................... 38

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)

4

On repairing CD section, playing a disc without the lid (CD), use
Chuck Plate Jig.
• Code number of Chuck Plate Jig: X-4918-255-1

LASER  DIODE  AND  FOCUS  SEARCH  OPERATION
CHECK
1. Turn ON the POWER button and press FUNCTION button to

CD position.

2. Open the lid (CD).
3. Turn on S801 with screwdriver, etc. as following figure.
4. Press the CD  N X  button.
5. Confirm the laser diode emission while observing the objecting

lens. When there is no emission, Auto Power Control circuit or
Optical Pick-up is broken.
Objective lens moves up and down three times for focus search.

5

This section is extracted
from instruction manual.

REC     PLAY    REW      FF    STOP/EJECT PAUSE

Z

 PUSH

N X

x

i

TUNE –, +
.

,>

N

x

X

.

,>

Tip
  To listen through headphones, connect the headphones to the i (headphones) jack.