Sony AVD-K600P Service Manual page 26

AVD-K600P
7. Hi-Fi Circuit
A.
Hi-Fi Playback.
No sound
Check the Hi-Fi Selection
Switch and the Tape quality.
YES
Is the RF waveform at
IC801 Pin 23 over 3V
Vp-p?
NO
YES
Is Pin 30 of IC801 over
3.5V ?
Check IC801 Pin 37(Data),
Pin 38(Clock).
YES
Is IC801 Pin 49(A.Mute)
"High"?
YES
Do Audio signals appear at
IC801 Pin 80(L-CH),
78 (R-CH)?
YES
Check the Contact point
of Audio Output.
26
YES
Check the Vcc of IC801.
(Pins 3, 15, 32, 46)
YES
YES
Is the Head switching signal
IC801 Pin 39 O.K?
YES
Check the connection at
P3D01 if good then
Replace IC801.
NO
Check Ports of µ-COM.
Check A.MUTE port of
µ-COM (Pin High of
IC501).
NO
Replace IC801.
NO
Check power.
NO
Check REC start "H" signal
of µ-COM.
Check IC501 Pin 19.
NO
(Audio Swich 30)