Clarion PU-2426A-A Service-Handbuch - Seite 2

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3. Check for safety after repair.

Check that the screws, parts and wires are put back se-

curely in their original position after repair. Ensure for

safety reasons there is no possibility of secondary ploblems

around the repaired spots.

If extended damage is caused due to negligence of repair,

the legal responsibility shall be with the repairing company.

4. Caution in removal and making wiring connection to the

parts for the automobile.

Disconnect the battery terminal after turning the ignition

key off. If wrong wiring connections are made with the bat-

tery connected, a short circuit and/or fire may occur. If ex-

tensive damage is caused due to negligence of repair, the

legal responsibility shall be with the repairing company.

5. Cautions regarding chips.

Do not reuse removed chips even when no abnormality is

observed in their appearance. Always replace them with

new ones. (The chip parts include resistors, capacitors,

diodes, transistors, etc). The negative pole of tantalum

capacitors is highly susceptible to heat, so use special care

when replacing them and check the operation afterwards.

6. Cautions in handling flexible PWB

Before working with a soldering iron, make sure that the

iron tip temperature is around 270 . Take care not to ap-

ply the iron tip repeatedly(more than three times)to the

same patterns. Also take care not to apply the tip with

force.

7. Turn the unit OFF during disassembly and parts replace-

ment. Recheck all work before you apply power to the unit.

SYSTEM CONTROL

M30624FGAGP

IC101

MOST-IC

OS8104

IC202

PIGTAIL

P201

PU-2426A-A

8. Cautions in checking that the optical pickup lights up.

9. Cautions in handling the optical pickup

9-1. Laser diode

9-2. Actuator

9-3. Cleaning the lens

052-0311-00

<NOTE.>Never use this Microcomputer without writing the program.

Because this Microcomputer does not have any program.

Please ask the detail to the service section of Clarion Tokyo.

BUFFER

TC74LCX07FT

IC103

BUFFER

SN74AHCT08PW

IC102

OSC IC

NJU6391

IC203

IC302,IC305,IC501

IC502,Q301,Q305

Q306

- 2 -

The laser is focused on the disc reflection surface through

the lens of the optical pickup. When checking that the la-

ser optical diode lights up, keep your eyes more than

30cms away from the lens. Prolonged viewing of the laser

within 30cms may damage your eyesight.

The laser diode of the optical pickup can be damaged by

electrostatic charge caused by your clothes and body. Make

sure to avoid electrostatic charges on your clothes or body,

or discharge static electricity before handling the optical

pickup.

The laser diode terminals are shorted for transporta-

tion in order to prevent electrostatic damage.

After replacement, open the shorted circuit. When

removing the pickup from the mechanism, short the

terminals by soldering them to prevent this damage.

The actuator has a powerful magnetic circuit. If a

magnetic material is put close to it. Its character-

istics will change. Ensure that no foreign substances

enter through the ventilation slots in the cover.

Dust on the optical lens affects performance. To

clean the lens, apply a small amount of isopropyl

alcohol to lens paper and wipe the lens gently.

EXPLANATION OF IC

M30624FGAGP Microcomputer without programs

KEY

MATRIX

POWER SUPPLY

NJU3715G

IC401

CD Changer

mechanism

IX-6