No Sound
1.
No audio signals at AV input circuit.
Check audio signals at pins 1, 13 (CG1), 5, 14 (CG2) and
2, 12 (VIDEO) of IC5011 on AV Board. Check IC5011 and
peripheral circuits.
2.
Incorrect operation of Input mode switching.
Check AUDIO_SW1/AUDIO_SW2 switching signals at pins
9 and 10 of IC5011. The AUDIO_SW1/AUDIO_SW2 sig-
nals are output from pins 4 and 5 of IC1801. See the truth
table below for input mode selection.
3.
No audio output signal at speakers.
Check audio signals at pins 3, 4 and 1, 2 of K16U on M
Drive Board.
Check MUTE signal at pin 8 of K16R/K8T.
The MUTE signal is output from pin 48 of IC1801.
Mute On : High
Check MUTE signal at pins 3 and 14 of IC1652.
Check sound volume signal at pin 7 of K16R/K8T.
The VOLUME signal is output from pin 15 of IC212 and it
is controlled by IC801 via the IIC bus.
Volume Min.: Low
Check audio signals at IC1651,IC1631, IC1632 and periph-
eral circuits.
4.
No power supply at audio circuit.
Check 6V(6V AUDIO) power supply line.
Logic Table of IC5011
Pin 10 Pin 9 Mode
LLCOMPUTER 1
HLCOMPUTER 2
LHVIDEO
To Next Page
Loading...
Need help?
General
