Antenna Trimmer - Jeep J-10 Series 1982 Technical & Service Manual

m
3V-1
RADIO SOUND
SYSTEMS
SECTION INDEX
Pige
AM and FM Reception 3V-7
AM/FM/CB Radios 3V-4
Antenna Relay 3V-13
Antenna Trimmer 3V-1
Bulb Replacement 3V-13
CB Radio Diagnosis 3V-12
Controls 3V-2
Electronically Tuned AM/FM Cassette Stereo Radio (ETR) 3V-6
GENERAL
All radios are a solid state design and have 3.2 ohms
impedance except for the electronically tuned AM/FM/
cassette radio (ETR) which has an impedance of 8.0
ohms. All radios operate with the ignition switch in the
On or Accessory positions. A standard nonadjustable,
whip-type antenna is used on all models except the Citi
zen Band (CB) radio antenna which has a longer antenna
than those used on other radios. A power antenna is
available for all radios except the AM/FM/CB radios.
CAUTION: Do not operate the CB radio with the an
tenna disconnected. Radio damage can result.
NOTE: The radio date of manufacture, model and se
rial numbers are stamped on the radio case.
ANTENNA TRIMMER
Antenna trimmer adjustment is necessary to match
the radio circuit to the antenna on all radios, except the
electronically tuned radio which is self-compensating.
The adjustment should also be checked whenever radio
reception is unsatisfactory.
Adjuster Location
•AM and AM/FM radio: just above the tuning
control.
• AM/FM stereo with cassette tape player: above the
manual station tuning knob.
Page
General
3V-1
Premium Audio System
3V-5
Radio Interference Diagnosis
3V-9
Radio Replacement
3V-12
Speakers
3V-15
Specifications
3V-16
Tools 3V-16
NOTE: Remove the instrument panel center housing to
gain access to the trimmer adjusting screw.
• AM/FM/CB radio: just left of the pushbuttons on
the face plate.
Trimmer Adjustment
When the trimmer is properly adjusted the volume
control will be turned to the medium volume position
and the greatest volume possible will be obtained. The
radio should be tuned to a weak AM station which maj
or may not be understandable when the trimmer adjust
ment is being made.
(1) Switch radio to AM band.
(2) Turn radio On and allow to warm up for a few
seconds.
(3) Turn manual station control knob to 1600 KC
range and find radio signal. Turn volume control to
medium setting.
(4) On AM and FM radios, remove outer and inner
tuning control knobs, (radios without tape player); then
remove center instrument panel to expose trimmer ad
justment located above tuning shaft. On AM/FM/Tape
radios, open tape door for trimmer screw adjustment.
On AM/FM/CB radio, AM trimmer adjustment is on
the face of the radio. The CB radio adjustment pro
cedure is found in Tuning CB Antenna/Splitter-box
section.
(5) Engage small slotted screw with standard
screwdriver.
(6) Turn screw left or right until greatest volume
level can be obtained without touching volume control.