Denon RCD-M40

TROUBLE SHOOTING
1. VFD is not lit
END
Check Reset signal for system μ-com.
DIGITAL PCB
• [IC11] : 38 pin RESET
"
Hi
" level O.K.?
Check Oscillation waveform.
DIGITAL PCB
• [IC11] : 49 pin
4 MHz OK?
Check POWER ON signal.
DIGITAL PCB
• [IC11] : 3 pin P_DWN
"
Hi
" level OK?
Check Power Supply Voltages for VFD.
FRONT PCB
• [FL81] : 38 pin VH
• [FL81] : 37 pin VDD
• [FL81] : 1 pin F1 - 43 pin F2
Check Reset signal for VFD.
FRONT PCB
• [FL81] : 35 pin / RST
"
Hi
" level O.K.?
Check Drive Signals for VFD.
FRONT PCB
• [FL81] : 32, 33, 34 pin DA, CP, CS
Check Power Supply Voltages for System μ-com.
DIGITAL PCB
• ST+ 3.9 V, [CN93] : 1 pin
• [D106] cathode
Check soldering.
• [CN92] : 1 pin
• SUB TRANS PCB
Check soldering.
• [IC11] on DIGITAL PCB
Check soldering.
• [X101] on DIGITAL PCB
Check soldering.
• [CN93] : 2 pin on DIGITAL PCB
• SUB TRANS PCB
Check soldering.
• FRONT PCB [BN75] : 3 pin +VKK
• FRONT PCB [BN75] : 2 pin FL1 / 1 pin FL2
• FRONT PCB [BN77] : 1 pin VFD+3.3 V
• POWER PCB [CN71] : 2 pin FL1 / 1 pin FL2
• POWER PCB [CN71] : 3 pin +VKK
• DIGITAL PCB [CN77] : 1 pin VFD+ 3.3 V
Check parts.
• POWER PCB
[Q911, D933, D934, D931, D932] OK?
Check parts.
• FRONT PCB [BN77] : 3 pin VFD_RST
• DIGITAL PCB [CN77] : 3 pin VFD_RST
• [IC11] on DIGITAL PCB
Check parts.
• FRONT PCB [BN77] : 4, 5, 6 pin
VFD_CE,VFD_CLK, VFD_DI
• DIGITAL PCB [CN77] : 4, 5, 6 pin
VFD_CE, VFD_CLK, VFD_DI
• [IC11] on DIGITAL PCB
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
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