Philips MC-77/22 Service Manual page 60

Service Hints
H
Measuringpoint : gate-signal of the FETs
I
Measuringpoint :
Digital output signal.
J
Measuringpoint :
The following three signals are measured after output filter
5101 with different timebases.
11-6
K
Measuringpoint :
After common mode coil 5102 - the audio signal is restored.