SAMSUNG max630 Troubleshooting
6. Troubleshooting
6-1 Amplifier
6-1-1 Power Malfunction
Malfunction of Audio Output
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Check voltage of NIC05 : 5V |
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Replace NIC05 |
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Check waveform of NIC9282 |
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Check NIC9282 soldering |
pin no. 19,20 |
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Check waveform of NIC9270 |
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Replace NIC9270 |
pin no. 9,12 |
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Check NIC9270 soldering |
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O
Check Amp
Samsung Electronics |
6-1 |
Troubleshooting
6-1-2 No Output
Main PCB AIC1(STK4191V) pin no. 8,9,11,12,14
B+,B- circuits
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AQ1L/1R Base B+ ?
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Is Mute selected ?
X
Headphone Jack short ?
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FIC3 (NJU3718) pin no.27
Check the "H" ?
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Check the B+ power
source part in RD1(PBL403), RC4 and RC5.
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Confirm for TR short |
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replace it. |
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Remove it with Remocon
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Replace Headphone jack soldering condition
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Replace FIC3(NJU3718) |
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Check if the output line is |
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short. |
6-2 |
Samsung Electronics |
Troubleshooting
6-1-3 Tuner Malfunction (FM/AM)
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MZD2 Voltage ok ? |
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Check MZD2 (8.2V), MR29 |
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Check TUNER IC(LA1836) |
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MZD1 (5.6V) Voltage ok? |
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pin no.10 ; 8.6V |
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MIC2 (LC72131) FM/AM BAND |
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pin no.14 ; 7.2V |
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Switching ok? |
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AM ; 0V ? |
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FM VT |
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LC72131 |
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LC72131 pin no.20 |
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CONTROL ok? |
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1.7V |
7.5V ? |
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AM VT |
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Check the LC72131 |
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LC72131 pin 20 |
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CONTROL ok ? |
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0.9V |
7V? |
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Check MIC2 |
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pin 20 ? |
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1) Power settion |
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defective ? |
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2) LC72131 Oscillator |
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(HX1 : 7.2MHz) ok ? |
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3) System line ok? |
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Check for -com IC |
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Replace LC72131 |
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LPF(MLPF 1L/1R) |
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Check FEP interior |
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Check TDA7318 function ok? |
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pattern, and any line |
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output ok? |
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disconnections. |
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Samsung Electronics |
6-3 |
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