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9-34
1 9 7 7 PONTIAC SERVICE MANUAL
The antenna trimmer adjustment should be made after
a set has been removed from car and worked on by a radio
repair man. Trimming the antenna is especially important
with the all-transistor radio as this will directly affect
sensitivity and selectivity. Complaints of station AM mixing
on AM all-transistor radios can be eliminated by this
adjustment.
Balance Adjustment
(AM/FM Stereo Models, B Series Only)
If the sound appears to be louder on one side of the car
than the other, an adjustment to the audio balance may be
made.
NOTE: On some stereo programming, it is normal for
one side to be louder than the other for a short time. This
is done purposely for stereo effect. The only positive
method to tell if the balance control needs adjustment
is to tune in a non-stereo program and make a critical
evaluation, in which the owner may assist.
If the adjustment is needed proceed as follows:
1. Turn radio on. Switch to AM band.
2. Remove left knob, spring and control ring to gain
access to stereo balance screw.
3. With fader control turned clockwise, insert
screwdriver into balance screw.
4. Rotate balance control adjustment clockwise or
counterclockwise until the sound in the left and right speakers
appear to have equal volume.
5. Install left control ring, spring and knob.
STEREO TAPE PLAYER
The only required maintenance on tape players is
periodic cleaning of the tape player head. This service should
be performed approximately every 100 hours of operation.
The head cleaning is done by swabbing the head (unit still
installed in car) with a cotton swab that has been dipped in
rubbing alcohol.
No lubricants should be used since they will cause
the player to operate improperly, especially at extreme
temperature.
Do not bring any magnetized tools near the tape head.
If the head becomes magnetized, every cartirdge played in the
player will be degraded.
A test tape cartridge is available for diagnosing problems
in tape players. The "Stereo
8"
test tape cartridge is part J
22683. (Test tape cartridges should always be stored in a
container to keep the tape clean.)
Remove and Replace
-
Except CB Radios
A Series (Fig. 9-39 and 9-40)
1.
Disconnect battery.
2. Remove radio knobs and bezels.
3. Remove I.P. lower trimplate.
4. Remove I.P. upper trimplate.
5. Remove (2) radio front retaining screws.
6. Remove radio from I.P. opening, disconnecting
electrical connections and antenna lead-in while radio is on
the way out.
7.
If radio is to be replaced with another unit, remove
bushing from rear of radio and install on replacement radio.
8. To replace, reverse removal procedure.
AG and G Series (Figs. 9-39 and 9-40)
1. Disconnect battery.
2. Remove radio knobs and bezels and retaining hex nut
from the righthand radio tuning shaft.
3. Remove (4) retaining screws and remove radio
trimplate.
4. Remove (1) front radio retaining screw and (1) radio
mounting bracket retaining screw (below radio).
5. Remove radio and bracket as an-assembly; disconnect
electrical connections and antenna lead-in while radio is on
the way out.
6. Remove radio support bracket nut and remove
bracket.
7.
To replace, reverse removal procedure.
B Series (Fig. 9-41)
1. Disconnect battery.
2. Remove upper trimplate.
3. Remove radio trimplate by removing 2 top screws,
removing ash tray assembly, disconnecting lighter, and
removing (2) small screws and large screw retaining ash tray
bracket.
4. Remove (2) screws securing radio.
5. Remove raido from I.P. opening, disconnecting
electrical connections and antenna lead-in while radio is on
the way out.
6. Remove bezel nuts to remove front radio trimplate if
a new radio is being installed.
7. To replace, reverse above procedure.
F Series (Fig. 9-42 and 9-43)
1. Disconnect battery.
2. Remove glove box and right lower A/C duct (on A/C
equipped cars only). For Stereo Radio, also remove center
A/C duct.
3. Remove radio knobs, nuts and lower trimplate.
4. Disconnect antenna lead-in and radio connecters.
5. Remove radio bracket and radio from passenger side
of I.P., thru glove box opening.
6. To replace, reverse removal procedure.
X, H and H M Series (Figs. 9-44 through 9-47)
1. Disconnect battery ground cable.
2. Remove "Hush" panel if present.
3. Remove radio control knobs and bezels.
4. Remove control shaft nuts and washers.
5. Disconnect antenna lead at rear of radio receiver.
6. Remove screws securing radio receiver to instrument
panel reinforcement.
7. Lower radio receiver with mounts still attached from
instrument panel and disconnect speaker and electrical
connecters.
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