Denon CEOL Piccolo DRA-N5, Service Manual

Page: 34 / 73

34
TROUBLE SHOOTING
1. OLED doesn’t light
Check Reset signal for Main μ-com.
MAIN B'D
• [IC403] : 19pin RESET
"H" level O.K.?
Check Oscillation waveform.
MAIN B'D
• [IC403] : 20pin
12MHz OK?
Check Power Supply Voltages for OLED
MAIN B'D
• [CN410] : 13pin +18V_OLED
• [CN401] : 1pin +16V_OLED
• [CN401] : 3pin +3.3V_D1
Check Drive Signals for OLED.
DISPLAY B'D
• [CN662] : 13-6pin DA0-DA7 , EL-E , RD , EL_R/W,WR
EL_D/C , EL-CS , EL_RESET
END
Check Power Supply Voltages for Main μ-com.
MAIN B'D
• +5V_SMPS1, [CN410] : 4,5pin
• +3.3V_CPU, [IC402] : 4pin
Check Soldering.
• [IC402] on MAIN B'D
• [CN410] : 4,5pin on MAIN B'D
• [CN005] : 4,5pin on B'D to B'D (CNT1)
• [CN006] : 9,10pin on B'D to B'D (CNT1)
• [CN224] : 9,10pin on SMPS B'D
Check Soldering.
• [IC404], [IC403] on MAIN B'D
Check Soldering.
• [RES401] on MAIN B'D
Check Soldering.
• [IC406] on MAIN B'D
• [CN401] on MAIN B'D
• [CN662] on DISPLAY B'D
• [CP661] on DISPLAY B'D
Check Soldering.
• [IC403] on MAIN B'D
• [CN401] on MAIN B'D
• [CP662] on DISPLAY B'D
• [CP661] on DISPLAY B'D
• OLED MDMULE.
NG
NG
NG
NG
NG
OK
OK
OK
OK