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