LG CJS45F Service Manual page 38

Mini hi-fi system

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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 pickup module in MD doesn't work. This step is for checking the LASER TRACKING ACTUATOR.

4-4. LASER TRACKING ACTUATOR

4-4-1. Solution

Please check and replace IC400, IC401 on MAIN board.

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

The tracking actuator makes the laser beam be positioned in the center of a track on CD disc.

1) Check the TRD signal from Pin22 of IC400.

  If no signal, check 3.3 V(RF) and X400.

2) Check TR- & TR+ from IC408 to CN401 for driving the tracking actuator.

  If no signal, check +1.8 V and +5 V for IC408.

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

4) Check the MD.

  If the pickup module has any trouble, it can not move the laser beam on the left or right side.

Please check the function after changing another MD.

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

< Waveform of TR±

for driving TRACKING actuator >

ONE POINT REPAIR GUIDE

< Signal check point >

3-9

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