Samsung MAX-888

Front PCB µ-com VDD(5V)
normal?
UIC1 pin no. 18,46,90
Check the Main PCB
RIC2(MC7805),FJ1
Check the Front PCB
UD9(1N4002), CN1-1
Main PCB RIC2(MC7805) IN: 12V
Input voltage normal?
Yes
Check the Main PCB;
RIC5(MC7812),PBD2
RR11 10Ω(1/2W)
Check the Power PCB;
Fuse P/T, PW1
Yes
No
No
Front PCB
Does UX1(6MHz)
oscillate ?
FRONT PCB PWR-SENS
voltage normal ?
(pin no. 11 ; 5V)
Check the Main PCB
RD4,RR19,RC13,RZD3
RC12,RR22,RR20
Yes
Front PCB
When the power is
ON 'H' displays
at pin no. 3 ?(5V)
Yes
Check the Main PCB
RQ7(C1008Y),RR9(22K)
RQ6(B1566), RR8(680Ω)
Replace µ-com.
Yes
No
No
No
Samsung Electronics 6-1
6. Troubleshooting
6-1 Amplifier
6-1-1 Power Malfunction