SAMSUNG max630 Troubleshooting

6. Troubleshooting

6-1 Amplifier

6-1-1 Power Malfunction

Samsung Electronics 6-1

O

Check voltage of NIC05 : 5V

X

O

Check waveform of NIC9282

pin no. 19,20

X

Check NIC9282 soldering

O

Check waveform of NIC9270

pin no. 9,12

X

Replace NIC9270
Check NIC9270 soldering

O

Replace NIC05

Check Amp

Malfunction of Audio Output

6-2 Samsung Electronics

Troubleshooting

O

AQ1L/1R Base B+ ?

O

Is Mute selected ?

O

Headphone Jack short ?

FIC3 (NJU3718) pin no.27

Check the "H" ?

Remove it with Remocon

Replace Headphone jack
soldering condition

Replace FIC3(NJU3718)

Main PCB AIC1(STK4191V)

pin no. 8,9,11,12,14

B+,B- circuits

Check the B+ power
source part in RD1(PBL403),
RC4 and RC5.

O

Confirm for TR short
replace it.

Check if the output line is
short.

O

X

X

X

X

X

6-1-2 No Output

Samsung Electronics 6-3

Troubleshooting

MZD2 Voltage ok ?

O

Check TUNER IC(LA1836)

pin no.10 ; 8.6V
pin no.14 ; 7.2V

AM ; 0V ?

MZD1 (5.6V) Voltage ok?

MIC2 (LC72131) FM/AM BAND

Switching ok?

X

O

LC72131

CONTROL ok?

O

FM VT

LC72131 pin no.20

1.7V 7.5V ?

O

AM VT

LC72131 pin 20

Check the LC72131

CONTROL ok ?

O

O

Check MIC2

pin 20 ?

LPF(MLPF 1L/1R)

output ok?

Check TDA7318 function ok?

Check FEP interior

pattern, and any line

disconnections.

 1) Power settion

defective ?

2) LC72131 Oscillator
(HX1 : 7.2MHz) ok ?

3) System line ok?

X

O

Check for µ-com IC

Replace LC72131

X

X

X

X

X

X

X

O

0.9V 7V

?

Check MZD2 (8.2V), MR29

6-1-3 Tuner Malfunction (FM/AM)