Service manual

Page 40
MODELS: LT-3280D/LT-3780D
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)
Raise volume level. And MUTE is turned off. Volume level is not 0. And MUTE is off.
YES
NO
YES
Are the specified voltages available at the
pins below? (Power source check)
CN Name Pin No. Voltage
S5V PD 9 5Vdc
S8V PD 8 8Vdc
AMPVCC PD 7 17Vdc
Psave3* PE 4 3Vdc
*control signal of AMPVCC
Problem is in the following
circuit (and peripheral
circuits) .
Voltage with
problem
PWB
including
the circuit
in problem
S5V
POWER
S8V
POWER
AMPVCC
POWER
Psave3
MAIN
Is all harness connected correctl
y
?
(Especially between PWB-MAIN and PWB-CONNECT(MA)
and PWB-CONNECT and SPEAKER(SP))
NO
Poor harness connection or
defective cable.
NO
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.