No Operation Of Md - LG CM2460 Service Manual

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 SLED MOTOR among them.
4-2. SLED MOTOR
4-2-1. Solution
Please check and replace IC800, IC801 on MAIN board.
4-2-2. How to troubleshoot (Countermeasure)
1) Check the SDOUT signal from pin15 of IC800.
  If no signal, check 3.3 V (pin63 RF) and X800.
2) Check the SLED+ & SLED- from IC801 to PN801 for driving SPINDLE motor. It is about 2.9 Vp-p.
  If no signal, check +5 V for IC801.
3) Check if the cable is solidly connected between PN801 and MD.
4) Check the MD.
  If the sled motor is sort-circuit or has any trouble, it can not move the pickup module.
Please check the function after changing another MD.
4-2-3. Service hint (Any picture/ Remark)
SL- TO PN801
SL+ TO PN801
< Waveform of SLED- & SLED+
for driving SLED motor >
ONE POINT REPAIR GUIDE
IC801 IC801
SLED+ SLED+
pin11 to IC801 pin11 to IC801
< Signal check point >
3-7
SLED- SLED-
pin12 to IC801 pin12 to IC801