ICF-CD873L - Sony Audio Service Manual (repair manual)

MICROFILM

AEP Model

UK Model

Model Name Using Similar Mechanism

CFD-550

Optical Device Name

KSM-213BAN

Optical Pick-UP Name

KSS-213B

Instruction manual (1)

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3

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4

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5

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7

Tuner Section ..................................................................

8

CD Section ......................................................................

9

Main Clock Section ......................................................... 11

6-1. Block Diagram  – CD Section – ..................................... 13
6-2. Block Diagram  – TUNER Section – ............................. 15
6-3. Block Diagram  – MAIN Section – ................................ 17
6-4. Printed Wiring Boards  – MAIN Section – .................... 22
6-5. Schematic Diagram  – MAIN Section – ......................... 25
6-6. Schematic Diagram  – POWER SUPPLY Section – ...... 30
6-7. Printed Wiring Boards

  – POWER SUPPLY Section – ...................................... 33

6-8. IC Pin Function Description ........................................... 39

................................................ 41

............................... 45

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CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.

This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.

Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.

The following caution label is located inside the unit.

– 3 –

CF2

CF3

mark

Mark

Center frequency

red

10.70 MHz

blue

10.67 MHz

orange

10.73 MHz

black

10.64 MHz

white

10.76 MHz

This model is used two ceramic filters of CF2 and CF3.
You must used same type of color marked ceramic filters in order
to meet same specifications.
Therefore, the ceramic filter must changed two pieces together
since it’s supply two pieces in one package as a spare parts.

The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down 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 emis-
sion, observe from more than 30 cm away from the objective lens.

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing 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.

Insert a precision 
screwdriver and 
push S424.

laser diode 
emission

1. Open the CD lid.
2. Turn on S424 as following figure.
3. Confirm that the laser diode emission while observing the ob-

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

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

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This section is extracted from
instruction manual.