Test Procedures; Antenna; Bench Test For Antenna Malfunction; Antenna Bench Test Points - Dodge D150 1990 Service Manual

8F - 4 RADIO, ANTENNA AND SPEAKERS
T E S T P R O C E D U R E S
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INDEX
Page
Antenna 4
ANTENNA
TESTING (FIG. 2)
A n t e n n a performance m a y be tested b y substitut-
i n g a k n o w n good antenna. I t is also possible to
check short or open circuits w i t h a n ohmmeter. or
c o n t i n u i t y l i g h t once t h e antenna cable is discon-
nected f r o m the radio as follows:
(1) C o n t i n u i t y should be observed between t h e t i p
of the mast and radio end p i n .
(2) N o continuity or a very h i g h resistance of sev-
eral megohms should be observed between t h e
ground shell of the connector and radio end p i n .
(3) C o n t i n u i t y should be observed between t h e
ground shell of the connector and the m o u n t i n g h a r d -
ware on t h e fender.
Fig. 2 Antenna Test Points
BENCH TEST FOR ANTENNA MALFUNCTION
(FIG. 3)
(1) W i t h test lamp and b a t t e r y i n circuit attach one
test lead t o concentric p i n on " l e a d - i n " connector and
other test lead to t i p o f mast. T h e l a m p should
" l i g h t " i n d i c a t i n g C o n t i n u i t y .
(2) K e e p i n g one lead o n connector p i n , clip other
lead o n a n t e n n a body assembly. T h e l a m p should
N O T l i g h t . I f i t does, look f o r a short c i r c u i t i n t h e
body or i n t h e cable probably a t the connector.
(3) Remove c l i p lead f r o m connector p i n and clip on
outer shell o f connector. Connect other clip lead t o
antenna body assembly. T h e l a m p should L I G H T
again. I f i t does n o t L i g h t , antenna s h i e l d i n g has a n
open circuit.
W i g g l e c a b l e o v e r i t s e n t i r e l e n g t h t o r e v e a l i n -
termittent s h o r t o r o p e n c i r c u i t s d u r i n g steps 1,
2 a n d 3 .
Fig. 3 Antenna Bench Test Points
REMOVAL
(1) Disconnect fusible l i n k i n engine compartment.
(2) Remove glove box.
(3) Reach b e h i n d i n s t r u m e n t panel a n d u n p l u g an-
tenna cable f r o m radio (Fig. 4).
VEHICLE ANTENNA LEAD
RN1005
Fig. 4 Unplugging Antenna Lead from Radio