Goldstar MC-993A Adjustment Instructions Manual page 17

12 IC701.
2.4V
6
IC701, X701.
35,36,37 IC507.
Q701.
IC507.
Check the waveform
at pin 9 of P504B.
NORMAL
Check/Replace Q2001~Q2003,
IC2001,D2008~D2009.
IC507,Q511~Q513.