LG CM9530 - Page 31

3-12
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.
5-3. TRAY OPEN / CLOSE MOTOR
5-3-1. Solution
Please check and replace IC407, IC408 on MAIN board.
5-3-2. How to troubleshoot (Countermeasure)
1) Check MOT_OPEN & MOT_CLOSE signals from Pin62 & 63 of IC501 to IC408.
 If no signal, check +1.8 V & + 5 V to IC408.
2) Check LOAD± from IC408 to CN405 for driving the tray open / close motor. It is about 3.85 Vp-p.
 If no signal, check +5 V to IC408. If it has any trouble, replace it with a new one.
3) Check if the FFC cable is solidly connected between CN405 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.
5-3-3. Service hint (Any picture / Remark)
tv{ js vz l
tv{vwlu
svROylkP
svT
027B23(1
SLQRI,&
027B23(1
SLQRI,&
/2 /2
< Waveform
for driving TRAY open / close motor >
< Signal check point >