Samsung MAX-810 - Troubleshooting; Amplifier Malfunctions Troubleshooting

Front PCB µ-com VDD(5V)
normal?
UIC1 pin no. 18,47,90
Replace RIC1
Main PCB RIC1(BA3950) IN: 23V
Input voltage normal?
Yes
Check the Power PCB;
RD7,8(1N5392)
Yes
Front PCB
Does UX1(12MHz)
oscillate ?
FRONT PCB PWR-SENS
voltage normal ?
(pin no. 27 ; 5V)
Check the Main PCB
RIC1(pin no. 10: 15V)
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
No
Replace µ-com.
Yes
No
No
No
No
Check the Power PCB : P/T, FUSE
No
Samsung Electronics 6-1
6. Troubleshooting
6-1 Amplifier
6-1-1 Power Malfunction