Denon DRA-F107 Service Manual page 11

6. No Sound,Noise generated
(1)CD/USB PLAY in
Check Analog Audio Data input for FUNCTION IC
MAIN B'D MCU,Function Bloc
[IC21] input 78,79pin
CD_L,CD_R
Check Power Supply Voltages for PREAMP & POWER AMP.
MAIN B'D MCU,Function Block
[BN61]:1,2,4pin+12V,-12V , SW+5.6V
D.POWER AMP B'D
[WP51]:5pin +12V
[CN91] : 1,2,3,7pin +27V
[IC53]: 3pin +12V
Check Power Supply Voltages for FUNCTION IC
MAIN B'D MCU,Function Bloc
[IC21]:30pin VDD (3.3V)
31pin AVCC+7V,67pin AVCC-7V
Check Control Signal for FUNCTION IC
MAIN B'D MCU,Function Bloc
[IC21]:27,28,29pin
CLK,DATA,LATCH
Check Analog Audio Data output from FUNCTION &
PRE AMP
MAIN B'D MCU,Function Bloc
[IC21]:44, 39pin Lout,Rout
[IC24]:1,7 pin
Check Audio function Mute Signal.
MAIN B'D MCU,Function Bloc
[Q103,104]:"L"level O.K.? (-12V)
Check Analog Audio Data input for POWER AMP
D.AMP B'D
[IC54]: 6,7pin IN_A,IN_B
12,13pin IN_C, IN_D
Check SPEAKER RELAY control Signal
MAIN B'D
[D573]:ANODE "L"level O.K.? (-12V)
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.
DRA-F107 / DRA-F107DAB
N.G Check Soldering.
[IC21] on MAIN B'D
JK21
Check Soldering.
N.G [BN61]:1,2pin +12V,-12V,
4pin SW+5.6V on MAIN B'D
[CN91]:1,2,3,7pin +27Von D.AMP BLOCK
WP51 :5pin +12V
SMPS B'D IC97,IC98,D945,D931
SMPS B'D IC91,D951
D.POWER AMP B'D IC53
Check Soldering.
N.G IC22,IC23 on MAIN B'D
IC64 on MAIN B'D
Check Soldering.
N.G IC62 on MAIN B'D
Check Soldering.
N.G IC21 on MAIN B'D
IC24 on MAIN B'D
Check Soldering.
N.G Q603,604, on MAIN B'D
IC62 on MAIN B'D
Check Soldering.
N.G [WC51] 1,3pin on MAIN B'D,
VOL_L_OUT,VOL_R_OUT
WP51 :1,3pin on D.Power B'D
IC51,IC52 on D.AMP B'D
Check Soldering.
N.G Q570,Q575 on MAIN B'D
[IC62] 77pin RL_MUTE on MAIN B'D
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