LG MCS1306F - Page 44

3-17
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 MOTOR among them.
4-3. TRAY MOTOR
4-3-1. Solution
Please check and replace IC407, IC408 on MAIN board.
4-3-2. How to troubleshoot (Countermeasure)
1) Check TUR+ & TUR-signals from Pin56 & 57 of IC501 to IC406.
 If no signal, check +5 V to IC406.
2) Check TUR_M+ & TUR_M- from IC406 to CN405 for driving TRAY motor. It is about 3.8 Vp-p.
 If no signal, check +5 V to IC406. 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 rotate the tray.
Please check the function after changing another MD.
4-3-3. Service hint (Any picture / Remark)
{|ytTGju[W\
{|ytRGGju[W\
hG
ZU_} T
{|ytT
_GGju[W\
{|ytR
^GGju[W\
pj[W_
< Waveform of TUR_M±
for driving TRAY motor >
< Signal check point >