Denon RCD-M38DAB

38
TROUBLE SHOOTING
1. VFD dosen't light
Check Reset signal for System µ-com.
MCU_CD B'D
•[IC11]:82pinRESET
"H" level O.K.?
Check Oscillation waveform.
MCU_CD_B'D
•[IC11]:72pin
10MHzOK?
Check Power On Signal.
MCU_CD B'D
•[IC11]:86pinP_DWN
"H" level OK?
CheckPowerSupplyVoltagesforVFD.
FRONTB'D
•[FL81]:38pinHV
•[FL81]:37pinVDD
•[FL81]:1pinF1-43pinF2
CheckResetSignalforVFD.
FRONTB'D
•[FL81]:3pin/RST
"H" level O.K.?
CheckVFDdiriveSignal.
FRONTB'D
•[FL81]:32,33,34pinDA,CP,CS
END
CheckPowerSupplyVoltagesforSystemµ-com.
MCU_CD B'D
•ST+3.9V,[CN96]:1pin
•[D204]cathode
CheckSoldering.
•[CN96]:1pin
•SUBTRANSB'D
CheckSoldering.
•[IC11]onMCU_CDB'D
CheckSoldering.
•[X101]onMCU_CDB'D
CheckSoldering.
•[CN96]onMCU_CDB'D
•SUBTRANSB'D
CheckSoldering.
•FRONTB'D [BN82]:7pin+VKK
•FRONTB'D [BN82]:8pinFL1-9pinFL2
•FRONTB'D [WF81]:1pinVFD_3.3V
•AMPB'D [CN95]:8pinAC15V
•AMPB'D [CN82]:7pin+VKK
•MCU_CDB'D [WN81]:1pinVFD_3.3V
•POWERB'D
Check Parts
•AMPB'D
Q703,D702,,D705,D703,D704OK?
CheckSoldering.
•FRONTB'D [WF81]:3pin,VFD_RST1
•MCU_CDB'D [WN81]:3pinVFD_RST
•[IC11]onMCU_CDB'D
CheckSoldering.
•FRONTB'D [WF81]:4,5,6pin,
  VFD_CE,VFD_CLK,VFD_DI
•MCU_CDB'D [WN81]:3pinVFD_RST
  VFD_CE,VFD_CLK,VFD_DI
•[IC11]onMCU_CDB'D
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK