Samsung MAX-610 Service Manual page 19

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