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OES NOT
TUNING
:E WHEN
-jANNEL
iED AND
4:1
CTPA
'HANNEL
JNNECTION
10
NO
THE PA
'CHANNEL
LINE (BLUI
OLTAGE
3,34,38
NO
'NELCHANGE
)PERA TING
:HECK
/NEL
'CUlT.
JR TEST PROCEDURE
RF OUT TERMINAL TO
OR DUMMY LOAD.
v TO TP13 TO ENABLE
ING MODE (SWITCHING
;TEl.
RADIO TO APPLY
A+ TO TUNER.
vOLTAGE AT UB-11
!, VOLTAGE AT UB-11
RADUALL Y DROP OURING
'QUENCE AS MATCHED
, IS APPROACHED.
U8-39
, LOW FOR APPROXIMATELY
JURING TUNING SEQUENCE.
TROUBLESHOOT
CHANNEL CHANGE
CIRCUIT IN TUNER
TUNER DOES
INITIATE TUNING
SE~UENCE
WHEN
RADIO IS TURNED
ON, BUT FULL POWER
VSWR > 4:1
PERFORM VSWR
DETECTO R TEST
PROCEDURE
PHASE DETECTOR TEST PROCEDURE
1.
DISCONNECT ANTENNA
FROM RF
OUT TERMINAL
2.
(T196OA ANO T1962A MODELS ONLY)
CONNECT A 560 PF CAPACITOR FROM
RF OUT TERMINAL
TO GROUND.
3.
GROUND TP1 1 AND TP12. UNSOlDER
AND REMOVE EITHER END OF R112.
4.
APPLY 3 WATT RF SIGNAL TO RF IN-
PUT TERMINAL
5.
VARY FREOUENCY
OF RF INPUT,
MEASURE VOLTAGE AT UB-I.
VOL-
TAGE SOULD BE LOW WHEN INPUT
FREOUENCY
IS BELOW 6.5 MHZ, AND
HIGH WHEN INPUT FREQUENCY IS
ABOVE 7.5 MHz.
6.
RECONNECT AND SOLDER R112. RE-
MOVE GROUND FROM TP11 AND TP12.
NOT OK
YES
NOT OK
REPLACE ANY BAD
RELAY OR DRIVER
TROUBLESHOOT
PHASE DETECTOR
CIRCUIT
7
oEEPS-30866-0
TROUBLESHOOT
TUNE POWER DETECTOR
AND VSWR DETECTOR
NO
CH ECK TUN [
CIRCUIT
IN ,
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