(No.MB508)1-11
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
