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Samsung Electronics
6-3
Troubleshooting
6-1-3 Tuner Malfunction (FM/AM)
IZD1 Voltage ok ?
Yes
Check TUNER IC(LA1836)
pin no.10 ; 7.6V
pin no.14 ; 6.5V
AM ; 0V ?
HZD1 (5.6V) Voltage ok?
HIC1 (LC72131) FM/AM BAND
Switching ok?
No
Yes
LC72131
CONTROL ok?
Yes
FM VT
LC72131 pin no.20
1.7V 7.5V ?
Yes
AM VT
LC72131 pin 20
Check the LC72131
CONTROL ok ?
Yes
Yes
Check HIC1
pin 20 ?
LPF(IL1, IL2)
output ok?
Check LC75394E 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?
No
Yes
Check for
µ
-com IC
Replace LC72131
No
No
No
No
No
No
No
Yes
0.9V 7V ?
Check IZD1 (6.8V), IR6
Содержание MM-26
Страница 24: ...Samsung Electronics 7 5 Exploded Views and Parts List 7 3 1 CD DECK Exploded View ...
Страница 47: ...10 PCB Diagrams 10 1 Main 10 1 Samsung Electronics ...
Страница 48: ...Samsung Electronics 10 2 10 2 Front 10 3 Power PCB Diagrams ...
Страница 49: ...10 3 Samsung Electronics 10 4 CD 10 4 1 Top View 10 4 2 Bottom View PCB Diagrams ...
Страница 52: ...12 2 Front Samsung Electronics 12 2 Schematic Diagrams ...
Страница 53: ...12 3 CD 12 3 Samsung Electronics Schematic Diagrams 1 1 2 2 3 3 ...