Aiwa HV-FX4100k Service Manual page 45

NO E-E(VIDEO AND
AUDIO FROM TUNER)
Are the plugs connected
to the VIDEO/AUDIO
input jacks ?
No
Do the voltages appear
at each terminal PB(5V),
TU(32V) and B+(5V) of
TU6001 ?
Yes
CHECK AUDIO
Does AUDIO signal
appear at pin 21
of TU6001 ?
Yes
Does AUDIO signal
appear at pin 1 and 2
of IC6601 ?
Yes
Check IC5501.
Check IC6601.
TROUBLESHOOTING GUIDE
Yes
No
CHECK VIDEO
Does VIDEO signal
No
No
appear at pin 24
of TU6001 ?
Replace TU6001.
Is there VIDEO
No
waveform at emitter
of Q6003 ?
Is there VIDEO waveform
at pin 52 of IC4001 ?
Check IC4501.
Yes
No
Yes
No
Yes
E-22
Disconnect the plugs from the
VIDEO/AUDIO input jacks.
Check Power Block.
Replace Q6003.
Check IC4001.