Samsung MAX-632P - Page 19

6-1-3 Tuner Malfunction(FM/AM)
MZD2 Voltage ok ?
Yes
Check TUNER IC(LA1836)
pin 10 ; 8.6V
pin 14 ; 7.2V
AM ; 0V ?
Yes
LC72131
CONTROL ok?
Yes
FM VT
LC72131 pin 20
1.7V 7.5V ?

Yes
AM VT
LC72131 pin 20
Check the LC72131
CONTROL ok?
Yes
Yes
Check MIC2
pin 20 ?
LPF(MLPF 1L/1R)
output ok?
Check TDA7318 function ok?
Check FEP interior
pattern, and any line
disconnections.
No
Yes
Check for µ-com IC
Replace LC72131
No
MZD1 (5.6V) Voltage ok?
MIC2 (LC72131) FM/AM BAND
Switching ok?
No
No
No
No
No
No
No
0.9V 7V
?
Check MZD2(8.2V),MR29
No
1) Power section
defective?
2)LC72131 Oscillator
(HX1:7.2MHz)ok?
3)System line ok?
Samsung Electronics 6-3
Troubleshooting