Denon PMA-50, Service Manual

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Check Power Supply Voltages for DIR.
MAIN PCB
[IC204] : 46pin +5V
[IC204] : 22,36,42pin +3.3V
OK ?
Check Power Supply Voltages for output stage.
AMP PCB
[CN4000] : 9 or 10 pin +28V
[CN4000] : 4 or 5 pin -28V
OK ?
Check Power Supply Voltages for PWM Modulator AMP PCB.
AMP PCB
[IC4006] : OUT : +3.3V
[IC4004] : OUT : +1.8V
[IC4000] : OUT : +3.3V
OK ?
Check Reset signal for DIR.
MAIN PCB
[IC204] : 77pin DIR_RESET
"H" level OK ?
Check Reset signal for PWM Modulator.
MAIN PCB
[IC903] : 63pin RESET
"H" level OK ?
Check Oscillation waveform.
MAIN PCB
[IC204] : 40pin TXO
24.576MHz OK?
Check Oscillation waveform.
AMP PCB
[IC903] : 154pin MCK_IN
108MHz OK?
Check the soldering or replace each device.
MAIN PCB
[IC300] : IN : +5V / OUT : +3.3V_D1
Check the soldering or replace each device.
[IC4006] : +3.3V
[IC4004] : +1.8V
[IC4000] : +3.3V
Check the soldering or replace each device.
[IC214] : 68pin DIR_RESET on MAIN PCB.
Check the soldering or replace each device.
[IC214] : 11pin CSR_RESET on MAIN PCB.
Check the soldering or replace each device.
[X203] on MAIN PCB.
Check the soldering or replace each device.
[X900] on AMP PCB.
Check the soldering.
[CN4000] on AMP PCB.
[CN221] on SMPS PCB.
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
2.2. COMMON(Power
,
Control signal line)
A
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