Samsung MAX-485 - Page 30

7-1-3. Tuner malfunction(FM/MW/LW)
A4(pin#4):12
MIC12(MC7812):12V
Check the voltage
TIC2(LM7000) X
FM/AM BAND
~ SWITCHING 7
Nok
heck the voltage _
ok ?
Apa
TZD1(5.6V)
C
Check FMB+
For PACK pin#4;
FM:11V, AM:0V
ok ?
we
ae FM VT FET(TFET2)
for PACK #5 ; CONTROL 2
“e LIV 8VE- ok?
Check the
FET(TFET1)
CONTROL
ck?
AM VT
for PACK #9 ;
, <x
av 1V?
we
oe
FM Oscillator (Pin 6);
AM Oscillator (Pin 14) ?
ae
LPF(TFL1R,TFL1L) ©
Output is ok?
Se
a oe
Check LC7821
function
ok?
oe
—_—_—__—_—_>|
22992.
Power impaired.
Repair defects
FO
De
)LM7000 Oscillato
(TCY1:7.2MHz) ok?
2)System Line. ~~
,ok?_-~
=
Check for MICOM IC(FIC 1)
a
Check PACK interior
pattern, and any
disconnecting line.