QT-CD180 (serv.man3). Part 1 - text - Sharp Audio Service Manual (repair manual). Page 12

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C847

C844

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X801

C84

0

IC801

C820

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R829

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R806

R851

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R824

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R805

C828

BI802 

C804

C816

R802

C801

R804

C815

C802

BI801 

Q801

C817

R801

C835

C834

R853

C807

IC802

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R862

R844

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C824

R861

CNP101

C843

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C825

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C823

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C827

R827

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C833

R828

FW806

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C106

R106

SW102 

IC803

BI803 

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805

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SW102
RECORD/PLAYBACK 

PLAY

REC.

1

10

330 ohm

Resistor

GND

27pin

MAIN
PWB-A1

OPEN/CLOSE

SW810
CD LID

SWITCH

BR

BR

GY

GY

GY

GY

GY

W

H

Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is not  necessary
to readjust it.
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.

While holding down the "Stop" and "Up" button at same time, move the FUNCTION switch to "CD".

Start

Note

1. When the CD LID switch is in the OFF position, (CD LID is open) the unit will be able to enter the test mode.

However, can use the "UP/CUE" and  "DOWN/REVIEW" button only.

2. You can only move the pickup.
3. The LCD display should be the same as it is for normal CD operations.

Operation

The use of the "UP/CUE" button will move the pickup to the outermost position.
The use of the "DOWN/REVIEW" button will move the pickup to the innermost position.

After connecting of the 10 kohm resistor between IC802  27 pin and GND and holding down the "Stop" and "Up"
button at same time, move the FUNCTION switch to "CD".

Start

Display

1. Before the laser light up, CD LID switch (SW801) terminals have to be short with the solder.

Resistor of 330ohm is put from 27 pin of IC802, and you must connect it to GND of PWB. (Refer to PWB of Figure 12-1.)

1. Remove the front cabinet according to the disassembly method.
2. Short the TP of the Figure 12-1 to turn on the CD LID switch (SW810).
3. While holding down the "Stop" and "Up" button at same time, move the FUNCTION switch to "CD".
4. Open the CD LID and press the PLAY button. The laser lights up for a few seconds. (At this time, the pickup lens moves

up and down and adjusts the focus to check if there is a disc or not.)