LG MDD64K Service Manual page 24

12. TAPE PLAY PART CHECK
TAPE REC PART
CHECK
YES
Check
IC604(PS9830)
_pin49, 52 PWM
output
YES
Check IC201_pin7, 24
record input
YES
Check IC201_
pin10, 21 output
YES
Check L203_pin2, 3
oscillation
YES
Check P2203_pin5, 3 input
and pin8 erase input
YES
OK
NO
Refer to PWM modulation
troubleshooting
NO
Check IC100_
pin23 "HIGH"
YES
OK
NO
Check Q205(D1304)_
base "HIGH"
YES
OK
3-9
NO
Replace IC201
NO
Check IC202_pin4 "HIGH"
YES
Replace IC202