(No.MB517)1-17
SECTION 5
TROUBLESHOOTING
5.1
Amplifier
5.1.1 Power Malfunction
5.1.2 No Output
Front
PCB u-com Vdd
normal?
SMPS
pcb SMIC42 input
voltage
normal?
check the
SMIC01,SMD43
-CHECK AMP PCS
WIRE CN107
Front PCB
dose UX101(10MHz)
oscillate?
Front PCB
p-sense voltage
normal?
(#82)
Check the SMPS
SMD44
Front PCB
When the power
on "H" pin no.94
(UIC01)
Replace u-COM IC
(UIC01)
-CHECK the AMP PCB
AIC01,FIC01,WIC01,WIC02
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Amp PCB
AIC01,WIC01,02
PIN NO.4,7,12,15
B+ normal?
Check
the SMPS pcb
SMIC02
check the
SMIC01,SMd43
CHECK AMP PCB
WIRE CN107
Amp
PCB AIC01,PIN
NO.51 normal?
(2.5 5V)
CHECK AMP PCB
BIC02 pin#3,6,7
voltage(3.0 5V)
Amp
PCB BIC01,PIN
NO14 normal?
(3.3V)
Replace of
BIC02
CHECK the master
clock (12.288MHz)
CHECK the
FIC01
NO
NO
NO
NO
YES
YES
YES
YES
