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NOTES ON HANDLING THE OPTICAL PICK-UP

BLOCK OR BASE UNIT

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 ﬂ exible 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 reﬂ ective surface by the objective lens in the optical

pickup block. Therefore, when checking the laser diode emission,

observe from more than 30 cm away from the objective lens.

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead-

free mark (LF) indicating the solder contains no lead.

(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

•

Unleaded solder melts at a temperature about 40 °C higher

than ordinary solder.

Ordinary soldering irons can be used but the iron tip has to be

applied to the solder joint for a slightly longer time.

Soldering irons using a temperature regulator should be set to

about 350 °C.

Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

•

Strong viscosity

Unleaded solder is more viscous (sticky, less prone to ﬂ ow)

than ordinary solder so use caution not to let solder bridges

occur such as on IC pins, etc.

•

Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may

also be added to ordinary solder.

NOTE OF REPLACING THE IC1 ON THE MAIN BOARD

IC1 on the MAIN board cannot exchange with single. When this

part is damaged, exchange the complete mounted board.

TEST DISCS

Use following TEST DISC when this unit conﬁ rms the operation

and checks it.

Part No.

Description

3-702-101-01

DISC (YEDS-18), TEST (for CD)

4-225-203-01

DISC (PATD-012), TEST (for CD)

SECTION 1

SERVICING NOTES

CHUCK PLATE JIG ON REPAIRING

On repairing CD section, playing a disc without the CD lid, use

CHUCK PLATE JIG.

Part No.

X-4918-255-1

LASER DIODE AND FOCUS SEARCH OPERATION

CHECK

During normal operation of the equipment, emission of the laser

diode is prohibited unless the upper lid is closed while turning on

the S801 (push switch type).

The following checking method for the laser diode is operable.

• Method

Emission of the laser diode is visually checked.

1. Open the CD lid.

2. In the standby state, press the [POWER] button to turn the

power on.

3. Press the [CD] button to turn the CD function.

4. Push the S801 as shown in Fig.1.

Note: Do not push the detection lever strongly, or it may be bent or

damaged.

5. Check the object lens for conﬁ rming normal emission of the

laser diode. If not emitting, there is a trouble in the automatic

power control circuit or the optical pick-up.

In this operation, the object lens will move up and down 2

times along with inward motion for the focus search.

Description

CHUCK PLATE JIG

S801

Fig. 1. Method to push the S801

ZS-PS30CP