Trouble Shooting; Oled Dosen't Light - Denon RCD-N9 Service Manual

TROUBLE SHOOTING

1. OLED dosen't light

Check Power Supply Voltages for SMPS.
Check the following voltages when the unit is connected to the AC
power supply.
SMPS PCB
•[BN93]：1pin Pulse signal of 50 or 60Hz of +4 V(P-P)
•[BN93]：11pin +5V
•[CN91]：1pin +29V (AMP_VCC)
If these voltages are not output, a fault may have occurred in the
SMPS PCB. Furthermore, the voltages of pins within [BN93] other
than those listed above are only output when the power is ON.
Check Power Supply Voltages for System μ-com.
MAIN PCB
•+3.3V [IC29]：3pin
Check Reset signal for Main μ-com.
MAIN PCB
• [IC28]：19pin RESET
"Hi" level OK.?
Check Oscillation waveform.
MAIN PCB
• [IC28]：20pin
12MHz OK?
Check Power Supply Voltages for OLED.
MAIN PCB
•[CN93]：13pin +18V_OLED
•[PF12]：12pin +16V_OLED
•[PF12]：8pin +3.3V_OLED
Check Drive Signals for OLED.
DISPLAY PCB
•[WF11]：D0 to D7,EL_RD,EL_RW,EL_DC,EL_CS,EL_RST
OK
OK
OK
OK
OK
END
NG
Replace the SMPS PCB.
Check the solder and replace any faulty parts.
NG
•[IC29]：3pin
•Main PCB
Check the solder and replace any faulty parts.
NG
•[IC28], [IC21]
NG
Check the solder and replace any faulty parts.
•[X200] on MAIN PCB
Check the solder and replace any faulty parts.
•[IC93] on SMPS PCB
NG
•[PF12] on MAIN PCB
•[WF11] on DISPLAY PCB
•[WF12] on DISPLAY PCB
Check the solder and replace any faulty parts.
•[IC28] on MAIN PCB
NG
•[IC29] on MAIN PCB
•[Q221, Q223] on MAIN PCB
•[WF11] on DISPLAY PCB
•OLED MODULE
35