Aiwa HV-FX7800 Service Manual page 56

ELECTRICAL TROUBLESHOOTING -16/17
6. Hi-Fi Circuit (Hi-Fi Model Only)
A.
Hi-Fi Playback.
No sound
Check the Hi-Fi Selection
Switch and the Tape quality.
YES
Is the RF Envelope at
IC801 Pin 44 over 2Vp-p?
YES
Check IC801 Pin 42(Data),
Pin 43(Clock).
YES
Do Audio signals appear at
IC801 Pin 16(L-CH),
17(R-CH)?
YES
Check the Signal path
of Audio Output.
YES
Check the Vcc of
IC801.(Pins 34, 40)
YES
NO
Is the Head switching signal
IC802 Pin 41 O.K?
YES
Check the connection at
P3D01 if good then
Replace IC801.
NO
Check Ports of µ-COM.
NO
Replace IC801.
-56-
NO
Check power.
NO
Check IC501 Pin 106.
(Audio head switch 25)