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15
1. Abnormal mode detect
Is a input
H-sync of ADC(pin 90,
U2) correct?
Abnormal mode
detect
No
No
Yes
Yes
Is waveform
of pin 81 of ADC(U2)
correct?
Trouble in the H-sync
input circuit.
Trouble
in ADC.
Trouble
in Scaler(U1).
Yes
TROUBLESHOOTING HINTS