ICF-CD832 - Sony Audio Service Manual (repair manual)

1

2004C04-1

© 2004. 03

US Model

Canadian Model

CD

Model Name Using Similar Mechanism

ICF-CD831

Section

CD Mechanism Type

KSM-213RDP

Optical Pick-up Name

KSS-213R

+1
–1.5

POWER OUTPUT AND TOTAL HARMONIC DISTORTION
With 8-ohm loads, both channels driven from 100 – 10,000 Hz; rated 1.0
W per channel minimum RMS power, with no more than 10% total
harmonic distortion in AC operation.

System:

Compact disc digital audio system

Laser diode properties:

Material: GaAlAs
Wavelength: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 

µW

(This output is the value measured at a distance of
about 200 mm from the objective lens surface on
the optical pick-up block with 7 mm aperture.)

Frequency response:

20 – 20,000 Hz        dB

Wow and flutter:

Below measurable limit

Frequency range:

FM: 87.5 – 108 MHz
AM: 530 – 1,710 kHz

Time display:

12-hour system

Speaker:

66 mm (2 

5 ⁄8

 inches) dia., 8 

Ω

Power outputs:

1 W + 1 W (at 10% harmonic distortion)

Power requirements:

120 V AC, 60 Hz

Dimensions:

Approx. 229 

× 104 × 218 mm (w/h/d)

(Approx. 9 

1 ⁄8

 

× 4 

1 ⁄8

 

× 8 

5 ⁄8

 inches) incl.

projecting parts and controls

Mass:

Approx. 1,650 g (3 lb. 10 oz.)

2

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0

• 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.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

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.

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.

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

Ω

µ

After correcting the original service problem, perform the follow-
ing 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 microampers.).
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” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able.  (See Fig. A)

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3

1-1.   Cord Dressing (Power Cord) ............................................... 5
1-2.   Pointer Alignment ............................................................... 5

............................................................................ 6

3-1.   Cabinet (Upper) Assy .......................................................... 7
3-2.   Lid (CD) .............................................................................. 8
3-3.   Chassis Assy ........................................................................ 8
3-4.   Main Board, Drive Board .................................................... 9
3-5.   Key (A) Board, Key (B) Board ........................................... 9
3-6.   CD Mechanism Deck ........................................................ 10
3-7.   Optical Pick-up ................................................................. 10

Tuner Section ......................................................................... 11
CD Section ............................................................................ 13

5-1.   Circuit Boards Location .................................................... 14
5-2.   Block Diagram – CD Section – ......................................... 15
5-3.   Block Diagram – Tuner Section – ..................................... 16
5-4.   Block Diagram – Main Section – ...................................... 17
5-5.   Printed Wiring Board – CD Section – ............................... 18
5-6.   Schematic Diagram – CD Section – .................................. 19
5-7.   Schematic Diagram – Main Section – ............................... 20
5-8.   Printed Wiring Board – Main Section – ............................ 21
5-9.   Schematic Diagram – Control, Display Section – ............ 22
5-10. Printed Wiring Boards – Key Section – ............................ 23
5-11. Printed Wiring Board – Drive Section – ........................... 24
5-12. Printed Wiring Board – Transformer Section – ................. 25
5-13. IC Pin Description ............................................................. 26
5-14. IC Block Diagrams ............................................................ 26

6-1.   Cabinet (Upper) Section .................................................... 28
6-2.   Cabinet (Lower) Section ................................................... 29
6-3.   Chassis Section ................................................................. 30
6-4.   CD Mechanism Section ..................................................... 31

........................................ 32

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

1. Turn ON the [POWER]  button and press [CD]  button to CD

position.

2. Open the CD lid.
3. Turn on S401 with screwdriver, etc. as following figure.
4. Press the  N X  (CD) 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.

S401