Hi-Fi Circuit - Toshiba SD-V55HTSU Circuit Diagrams

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?
YES
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.
YES
Check the Vcc of IC801.
(Pins 3, 15, 32, 46)
YES
NO
Is Pin 30 of IC801 over
3.5V ?
YES
Is the Head switching signal
IC801 Pin 39 O.K?
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
NO
YES
Replace IC801.
3-16
NO
Check power.
Check REC start "H" signal
of µ-COM.
Check IC501 Pin 19.
NO
(Audio Swich 30)