Samsung MAX-440 - Troubleshooting

7. Troubleshooting
7-1. The Amplifier section
7-1-1. Power malfunction
Check the power
circuit; RD2(PBP203)
AND,MWA3(8pin) check
: AC VOLTAGE?
Main PCB
RQ3(D73Y)
E=12V?
FRONT PCB
y-com VDD(5V) normal?
UIC1 pin no. 18,
47,90
Check the POSNS circuit
Check ;UQ4,UC9,UC36
FRONT PCB
Does UX1(12MHz)
it oscillate?
MAIN PCB
Check the turn on ?
(RQ5)
Replace MICOM
Check the connector Main PCB
:MWA3,FWA3
x
Check
the
POWER
PCB
:
P/T,
FUSE
MAX-440 -24-