SAMSUNG max858, max860 Troubleshooting

6. Troubleshooting

6-1 Amplifier

6-1-1 Power Malfunction

Front PCB µ-com VDD(5V)		No		No		Check the Main PCB;
			Main PCB RIC2(MC7805) IN: 12V			RIC5(MC7812),PBD2
normal?						RR11 10Ω (1/2W)
UIC1 pin no. 18,46,90			Input voltage normal?			Check the Power PCB;
						Fuse P/T, PW1
			Yes
			Check the Main PCB
	Yes		RIC2(MC7805),FJ1
			Check the Front PCB
			UD9(1N4002), CN1-1

Front PCB	No
Does UX1(6MHz)
oscillate ?

Yes

Front PCB

When the power is No ON 'H' displays

at pin no. 3 ?(5V)

FRONT PCB PWR-SENS	No		Check the Main PCB
voltage normal ?			RD4,RR19,RC13,RZD3
(pin no. 11 ; 5V)
			RC12,RR22,RR20

Yes

Replace µ-com.

Yes

Check the Main PCB RQ7(C1008Y),RR9(22K) RQ6(B1566), RR8(680Ω )

Samsung Electronics

6-1

Troubleshooting

6-1-2 No Output

Main PCB AIC1 pin no. 1,8,16,17 B+,B- normal?

Yes

AQ8L, 8R, 1L, 1R ?

Base B+?

Yes

Is Mute selected ?

No

Headphone Jack short ?

No

UIC1( -COM) pin 5

Check the "H"?

No

No

Yes

Yes

Yes

No

Check the B+,B- Power source BPD1, RC7, RC8, RWA1

Check the Power PCB Fuse, P/T, PW1

Check the Main PCB

AIC1, FIC2, FIC1

Remove it with Remocon.

Check Headphone jack soldering condition.

Check the Front PCB

UIC1 ( -COM).

Check the Main PCB

AQ8L,8R,1L,1R

6-2	Samsung Electronics