Audio Troubleshooting - Mitsubishi Electric LT-3280 Service Manual

3. No audio output generated. 3. No audio output generated. 3. No audio output generated. 3. No audio output generated. 3. No audio output generated.
3-1. No all audio output generated. 3-1. No all audio output generated. 3-1. No all audio output generated. 3-1. No all audio output generated. 3-1. No all audio output generated.
Enter audio input signal. ( ex. PC Audio)
Is all harness connected correctly?
(Especially between PWB-MAIN and PWB-CONNECT(MA)
and PWB-CONNECT and SPEAKER(SP))
YES
Volume level is not 0. And MUTE is off.
YES
Are the specified voltages available at the
pins below? (Power source check)
CN Name
S5V
S8V
AMPVCC
Psave3*
*control signal of AMPVCC
YES
Problem is in IC301 or their peripheral circuits.
Please exchange PWB-MAIN
*When it cannot still fix, it may have a problem with SPEAKER. *When it cannot still fix, it may have a problem with SPEAKER. *When it cannot still fix, it may have a problem with SPEAKER. *When it cannot still fix, it may have a problem with SPEAKER. *When it cannot still fix, it may have a problem with SPEAKER.
MODELS: LT-3280D/LT-3780D
NO
Pin No. Voltage
PD 9 5Vdc
PD 8 8Vdc
PD 7 17Vdc
PE 4 3Vdc
Page 40
NO
Poor harness connection or
defective cable.
Raise volume level. And MUTE is turned off.
NO Problem is in the following
circuit (and peripheral
circuits) .
Voltage with
problem including
the circuit
in problem
S5V
POWER
S8V POWER
AMPVCC POWER
Psave3
PWB
MAIN