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3-8

Only for training and service purposes.

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if

the servo motors in MD don’t work. This step is for checking the TRAY OPEN / CLOSE MOTOR among

them.

4-3. TRAY OPEN / CLOSE MOTOR

4-3-1. Solution

Please check and replace IC400, IC401 on MAIN board.

4-3-2. How to troubleshoot (Countermeasure)

1) Check MOT_OPEN & MOT_CLOSE signals from Pin P4, L4 of IC500 to IC400.

 If no signal, check VDD_CORE and DVCC_3.3V to IC401.

2) Check LOAD± from IC400 to CN401 for driving the tray open / close motor. It is about 3.85 Vp-p.

 If no signal, check M_5V to IC400. If it has any trouble, replace it with a new one.

3) Check if the FFC cable is solidly connected between CN401 and MD.

4) Check the MD.

 If the tray motor is sort-circuit or has any trouble, it can not open or close the tray.

Please check the function after changing another MD.

4-3-3. Service hint (Any picture / Remark)

LO- TO CN401

LO+ TO CN401

MOT_OPEN

< Waveform for driving

TRAY open / close motor >

< MAIN

board top

view >

< MAIN board bottom view >

CN401

IC400

MOT_CLOSE : pin6 to IC500

MOT_OPEN : pin7 to CN401

LOAD+ : pin9 to CN401(pin4)

LOAD- : pin10 to CN401(pin2)

LG CKS57F Service Manual

Other manuals for LG CKS57F