Check the audio signal.
Set "
Variable Out
" and "
Phones
" to ON in "
Audio
" in the menu
settings.
Line Out, Variable Out, H / P Out output terminal.
Is audio output?
Is there no output from only the Variable Out terminal?
(The variable out is set to a very low level by default, so turn the
volume to max using the remote control when checking opera-
tions.)
Is there no output from only the H/P Out terminal?
There may be an abnormality in the combined differential at a
point after the I/V conversion circuit.
Refer to the circuit diagram and check for open parts or a short
circuit to identify the malfunctioning part.
Or replace the AUDIO PCB.
Check power supply voltage.
AND Logic IC[
U2013 : 14pin
] 3.3V ?
Check input/output waveform.
IC[
U2013
]
If there is an abnormality, replace IC[
U2013
].
Check the output signal.
AUDIO PCB
Are signals output from all of the I/V converter circuit outputs (4
circuits) of the last stage of DAC IC [
U2002
]?
[
R2044, R2055, R2042, R2043
] DC Audio Signal
Check each part listed after "
1.4. I2C Communication Line Abnor-
".
The MCU is malfunctioning or latched.
Checking the Digital communication waveform.
AUDIO PCB
[
U2007 : 17pin
]DATA, [
18pin
]CLK
Is there an abnormality in the "
Hi
" (3.3V) or "
Lo
" (0V) level?
If there is no abnormality in the power supply voltage of [
U2007
] but there is an abnormality in the input/output waveform:
Replace the [
U2007
].
If the problem is not resolved after replacing this, check each part listed after "
1.4. I2C Communication Line Abnormalities
".
Check the following areas to identify the area where the signal is cut off.
Connection of [CN2001].
Signal Relay [
RLY2001
] and H/P circuits after this point
Replace the part where the signal is cut off.
Replace the Audio PCB if repair of single parts proves too complicated.
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
Check the relay.
Variable Out, H/P Out : Signal Relay [
RLY2000, RLY2001
]
Set "
Variable Out
" and "
Phones
" to ON/OFF in "
Audio
" in the menu settings.
RLY2000 : [CN2002 : 2pin] ON: Hi(3.3V), OFF : Lo (0V)
RLY2001 : [CN2002 : 8pin] ON: Hi(3.3V), OFF : Lo (0V)
Check the following and replace for the following parts.
Variable Out, H/P Out : Signal Relay[
RLY2000, RLY2001
]
Relay driving circuit
Replace the part that is not operating or AUDIO PCB.
Check the following areas.
Signal Relay[
RLY2000, RLY2001
]。
Replace the part where the signal is cut off.
Replace the Audio PCB if repair of single parts proves too complicated.
OK
NG
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
47