Denon DRA-F107 Service Manual page 9

2. POWER OFF with Blinking POWER LED
Check Power Supply Voltages for Analog Block
MAIN B'D MCU,Function Bloc
IC21 :31pin AVCC+7V
67pin AVCC-7V
Check Power Supply Voltages for Digital Block
MAIN B'D MCU,Function Bloc
IC64 :3pin 3.3V
WC52 :3pin HB+
Check Protect Signal for System uCOM.
MAIN B'D MCU,Function Bloc
[IC62]:71pin PROT_2 High Level OK?
Check Protect Signal for D.Power Amp
D.POWER AMP B'D
IC53 :3pin 12V
IC54 :17pin SD,18pin OTW,19 pin READY
High Level OK?
Check Control Singal for DC Protect
Q573_B Low Level OK?
Check Protect Signal for System uCOM.
MAIN B'D MCU,Function Bloc
[IC62]:74pin PROT_1 High Level OK?
END
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 Soldering.
IC22,23 on MAIN B'D
BN61 :1pin,2pin ±12V on MAIN B'D
CN92 1pin,2pin ±12V on SMPS B'D
SMPS B'D IC97,IC98,D945,D931
Check Soldering.
MAIN B'D MCU,Function Bloc
IC64
BN61 :4pin SW5.6V
WC52 :3pin 27VA
D.POWER AMP B'D
WP52 :3pin 27VA
CN91 :1,2,3,7pin 27VA
SMPS B'D
BN91 :1,2,3,7pin 27VA
D931
Check Soldering.
MAIN B'D MCU,Function Bloc
D371,D373,D374
Check Soldering.
D.POWER AMP B'D
IC54
IC53
IC54,IC53
D.Power Amp Heat Sink
Check Soldering.
MAIN B'D MCU
Q571,572,573,574
D571,572
Check Parts
Q571,572,573,574
D571,572
Check Soldering.
MAIN B'D MCU
D570
D.POWER AMP B'D
D504,D505,D506
9