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TROUBLESHOOT
VSWR
DETECTOR CI RCUIT
CHECK SWITCHED
A+ CIRCUIT IN
RADIO
REPLACE FUSE
TROUBLESHOOT
VOLTAGE REGULATOR
CIRCUITS
CHECK CHANNEL
CHANGE CI RCUIT
IN RADIO
CHECK RESET
CIRCUIT (Q23, Q2~)
CHECK TIMING
ELEMENTS: C30,
C3I, C32, AND
YI
TUNER DOES NOT
INITIATE TUNING SEOUENCE
WHEN RADIO IS SWITCHED
ON AND VSWR >
~:1
YES
NO
YES
NO
NO
NO
NO
REPLACE U8
NO
TROUBLESHOOT
ANT TUNE LINE
CIRCUIT IN
RADIO
TROU8LESHOOT
TUNE POWER DETECTOR
AND VSWR DETECTOR
f
RELAY AND RELAY DRIVER.
TEST PROCEDUR E
I.
GROUND TPI2 (RUNfTESn.
VERIFY THAT RELAYS K1-K5
ARE CLOSED.
2.
GROUND TPII
(ELEMENTS
IN/
OUT) AND TP12 (RUNfTEST).
VERIFY THAT RELAYS K6-K21
ARE CLOSED, AND KI-K5
ARE
OPEN.
3.
INDIVIDUALLY
CHECK EACH
RELAY 8Y:
-
DISCONNECTING
EITHER
END OF L9.
- APf'L YING 13.8 V TO THE
SWITCHED A+ INPUT (GRN).
- GROUNDING
THE APPROPRI-
ATE TEST POINT TO ACTIVATE
RELAY (TPI-TPS,
TP17-TP28).
4.
RECONNECT AND SOLDER La. RE-
MOVE GROUNO FROM TPII AND
TPI2.
TUNER DOES NOT
INITIATE TUNING
SEOUENCE WHEN
RADIO CHANNEL
IS CHANGED AND
VSWR > ~:I
DISCDNNECT PA
DlSA8LE/CHANNEL
CHANGE CONNECTIO
FROM RADIO
GROUND THE PA
DISA8LE/CHANNEL
CHANGE LINE (Bll
CHECK VOLTAGE
AT U8-28, 34, 38
TUNER CHANNEL CHA
CIRCUIT IS OPERATIN(
PROPERLY. CHECK
RADIO CHANNEL
CHANGE CI RCUIT.
VSWR DETECTOR TEST P
I.
CONNECT RF OUT TI
ANTENNA OR DUMM
2.
APPLY +5 V TO TP13
SLOW TUNING MODE
AT 2 Hz RATE).
3.
TURN ON RADIO TO
SWITCHED A+ TO TU
~.
MONITOR VOLTAGE
ANDJ8-39.
VOLTAG
SHOULD GRADUAlL
TUNING SEOUENCE
CONDITION IS APPR'
SHOULD 8E lOW fO
1 SECOND DURING 1
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