Goldstar MC-993A Adjustment Instructions Manual page 11

FR459, FR901.
61
20~25, 28~29
Q205, IC201.
10~17 IC503.
29~30, 32~37 IC504.
IC503.
Check the waveform
IC504.
at pin 54~61 of IC507.
Check/Replace IC507,
Check/Replace IC507.
Q502~Q510.