Troubleshooting - Samsung MAX-632P Service Manual

6. Troubleshooting

6-1 Amplifier
6-1-1 Power Malfunction
Front PCB µ-com VDD(5V)
normal?
UIC1 pins 18,47,90
Front PCB
Does UX1(12MHz)
oscillate ?
Front PCB
When the power is
ON 'H' displays
at pin 1 ?(5V)
Connect Front PCB and Main PCB.
Check the connector Main PCB.
Wafer CCW1,CCW2
Samsung Electronics
No
Yes
No
Yes
No
Yes
No
Main PCB RIC1(MC7805) IN: 23V
Input voltage normal?
Yes
Replace RIC1
FRONT PCB PWR-SENS
voltage normal ?
(pin 29 ; 4.5V)
Yes
Replace µ-com.
Check the Power PCB : P/T, FUSE
No
Check the Power PCB;
RD3(1N4001),
RR2(22Ω, 3W)
No
Check the Main PCB
RD11,RR16,RC17,RZD6
RC16,RR17,RR26
6-1