3-9
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 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 >
< Signal check point >
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