Troubleshooting; Power Malfunction - Samsung MAX-460V Service Manual

6. Troubleshooting

6-1 Amplifier

6-1-1 Power Malfunction

Front PCB µ-com VDD(5V)
normal?
UIC1 pin no. 18,47,90
Yes
Front PCB
Does UX1(12MHz)
oscillate ?
Yes
Front PCB
When the power is
ON 'H' displays
at pin no. 5 ?(5V)
Yes
Connect Front PCB and Main PCB.
Check the connector Main PCB.
Wafer MCW2
Samsung Electronics
No
Main PCB RIC1(BA3950) IN: 23V
Input voltage normal?
Replace RIC1
No
FRONT PCB PWR-SENS
voltage normal ?
(pin no. 27 ; 5V)
No
Replace µ-com.
No
Check the Power PCB : P/T, FUSE
No
Yes
No
Yes
Check the Power PCB;
RD7,8,13(1N5392)
Check the Main PCB
RD16,RR10,11,12,RC12
RD9
6-1