Denon RCD-N7 Service Manual page 39

TROUBLE SHOOTING
1. OLED dosen't light
Check Power Supply Voltages for System µ-com.
MAIN B'D
• +6V_CPU, [CN43] : 4pin
• +3.3V_CPU, [IC12] : 3pin
Check Reset signal for System µ-com.
MAIN B'D
• [IC11] : 19pin RESET
"H" level O.K.?
Check Oscillation waveform.
MAIN B'D
• [IC11] : 20pin
16MHz OK?
Check Reset signal for OLED µ-com.
DISPLAY B'D
• [IC81] : 19pin RESET
"H" level O.K.?
Check Oscillation waveform.
DISPLAY B'D
• [IC81] : 20pin
16MHz OK?
Check Power Supply Voltages for OLED.
DISPLAY B'D
• [CN84] : 24pin +3.3V
• [CN84] : 3pin +16V
Check Reset Signal for OLED.
DISPLAY B'D
• [CN84] : 20pin
"H" level O.K.?
Check OLED dirive Signal.
DISPLAY B'D
• [CN84] : 13-6pin DA0-DA7
OK
OK
OK
OK
OK
OK
OK
END
Check Soldering.
NG
• [IC12] on MAIN B'D
• [CN43] : 4pin
• SMPS B'D
NG
Check Soldering.
• [IC11] on MAIN B'D
NG
Check Soldering.
• [X202] on MAIN B'D
NG
Check Soldering.
• [IC81] on DISPLAY B'D
NG
Check Soldering.
• [X802] on DISPLAY B'D
NG
Check Soldering.
• [CN88] on DISPLAY B'D
• [CN41] on MAIN B'D
NG
Check Soldering.
• [IC81] on DISPLAY B'D
NG
Check Soldering.
• [IC81] on DISPLAY B'D
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