Troubleshooting - Denon DRA-F107 Service Manual

TROUBLE SHOOTING
1. FLD dosen't light
Check Fuse
SMPS B'D
F901 OK?
Check Power Supply Voltages for System uCOM.
MAIN B'D MCU,Function Bloc
[BN96]:1pin ST+6V
[D607]:Cathode
[IC65]:3pin +3.3V
Check Reset signal for System uCOM.
MAIN B'D MCU,Function Bloc
[IC62]:10pin RESET
"H"level O.K.? (>2.8V)
Check Oscillation waveform.
MAIN B'D MCU,Function Bloc
[IC62]:11pin
14.7456MHz OK?
Check Power 50/60 Signal
MAIN B'D MCU,Function Bloc
[IC62]:19pin 50/60
Pulse OK?
Check Power Supply Voltages for FLD
FRONT B'D
[FL81]:38pin VH (42V)
[FL81]:37pin VDD (3.3V)
[FL81]: 1pin F1,43pin F2 (AC3.3V)
Check Reset Signal for FLD
FRONT B'D
[FL81]:35pin /RST
Hlevel O.K.? (3.3V)
Check FLD Dirive Signal for FLD
FRONT B'D
[FL81]:32,33,34pin DA,CP,CS
END
N.G
O.K.
N.G
O.K.
N.G
O.K.
N.G
O.K.
N.G
O.K.
N.G
O.K.
N.G
O.K.
N.G
DRA-F107 / DRA-F107DAB
Check if there is any leak or short-circuiting
on rectifier circuit of SMPS B'D
Check Parts
Q903,IC93,IC92,DB91 on SMPS B'D
Check Soldering.
[BN96]:1
SUB TRANS B'D
Check Soldering.
IC66 on MAIN B'D
Check Soldering.
X202 on Main B'D
Check Soldering.
[BN96]: 2pin
SUB TRANS B'D
Check Soldering.
FRONT B'D [BN83]:3pin +VKK
FRONT B'D [BN83]:4pin ,5pin F_AC
FRONT B'D [WF81]:1pin SW+3.3V
SMPS B'DCN93 3pin VKK
SMPS B'D,CN93 4pin FL+- 5pin FL-
MAIN B'DWN81 1pin SW+3.3V
Check Parts
SMPS B'D
Q933,Q934, IC97,D945, D935
IC94, D950 ,D933
Check Soldering.
FRONT B'D [WF81]:5pin VFD_RST1
MAIN B'D [WN81]:5pin VFD_RST1
[IC62]:2pin FL_RST on MAIN B'D
Check Soldering.
[WF81]: 2,3,4pin on FRONT B'D
VFD_DI,VFD_CLK,VFD_CE
[WN81]: 2,3,4pin on MAIN B'D
VFD_DI,VFD_CLK,VFD_CE
IC62 on MAIN B'D
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