Denon PMA-50, Service Manual

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TROUBLE SHOOTING
1. OLED dosen't light
Check Reset signal for Main μ-com.
MAIN PCB
[IC214] : 25pin RESET
"H" level O.K.?
Check Oscillation waveform.
MAIN PCB
[IC214] : 23pin
8MHz OK?
Check Power Supply Voltages for OLED.
MAIN PCB
[CN504] : 9pin +19V_OLED
[FPC303] : 16pin +17V_OLED
Check Power Supply Voltages for SMPS.
Check the following voltages when the unit is connected to the AC
power supply.
SMPS PCB
[CN222] : 3 or 4 pin +5V
[CN222] : 1pin +19V
If these voltages are not output, a fault may have occurred in the
SMPS PCB.
Check Power Supply Voltages for System µ-com.
MAIN PCB
+3.3CPU [IC301] : 3pin
Check Drive Signals for OLED.
FRONT PCB
[FPC502] : OLED_(DC, MOSI, SCLK, CS)
END
Check the soldering or replace each device.
MAIN PCB
[IC301]
Check the soldering or replace each device.
[IC214], [IC307]
Check the soldering or replace each device.
[X301] on MAIN PCB.
Check the soldering or replace the MAIN PCB.
[IC310] on MAIN PCB.
[FPC303] on MAIN PCB.
[FPC502] on FRONT PCB.
[FPC501] on FRONT PCB.
Replace the SMPS PCB.
Check the soldering or replace each device.
[IC214] on MAIN PCB.
[FPC502] on FRONT PCB.
OLED MODULE.
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
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