Cadillac 60 Series 1963 Shop Manual page 344

ELECTRICAL SYSTEM
12-63
c. Push Button Tuning
(AM or AM-FM Radios)
After the five push buttons are set to the
owner's five station selections,, it is necessary
only to push any button to tune in the station
for which the button is set, and the corresponding
band switch on AM/FM Radios.
d. Automatic Tuning
(AM Radios Only)
To use automatic tuning, depress the selector
bar above the dial momentarily. Any station
within range of the receiver can be obtained by
holding the bar depressed until the dial pointer
approaches the desired frequency, and then re-
leasing the bar.
The automatic tuner requires the use of a
conventional tube, t h e r e f o r e , thirty seconds
warm-up time is needed before the selector
bar will operate.
e. Sensitivity Control
(AM Radios Only)
The three-position toggle switch, located below
the center of the selector bar, controls the station
selecting sensitivity of the signal seeking tuner.
By moving the switch to its most sensitive po-
sition (right), it is possible for the tuner to pick
up all receivable stations by depressing the se-
lector bar. When the switch is moved to its
intermediate position (center), the tuner will not
select any of the weakest stations, and with the
switch in its least sensitive position (left), only
the strong stations will be selected.
f. Frequency Band Switch
(AM-FM Radios Only)
The frequency band switch is located above
the frequency bands. Depressing the left side
of the band switch connects the radio for AM
reception, and illuminates the AM tell-tale light
located on the left side of the AM frequency
band. Depressing the right side of the band
switch connects the radio for FM reception,
illuminating the FM tell-tale light located on the
right side of the AM frequency band.
g. Rear Seat Remote Control
75 Series Cars (AM Radios Only)
A rear seat radio remote control is available
as an accessory for 75 series cars equipped
with the signal seeking AM radio. The remote
control consists of an ON-OFF volume control,
a sensitivity control and a selector button. It is
located in the right rear arm rest.
The rear seat remote control overrides the
front radio controls. Once the remote control
is turned ON, the front controls, with the ex-
ception of the push bottons and manual tuner,
will not operate the radio until the remote con-
trol is turned OFF.
The ON-OFF volume control knob turns the
radio ON and OFF and controls the volume. The
sensitivity control is located beneath the ON-OFF
volume control knob. Rotating the control counter-
clockwise permits the tuner to stop only on the
stronger signals. In the middle position, the
tuner will stop on weaker signals. Rotating the
control clockwise permits the tuner to stop at
the weakest receivable signals.
When the remote control is ON, the red se-
lector button is illuminated. Depressing this but-
ton performs the same function as pressing the
selector bar.
82. Radio Noise Suppressors
a. Static Collectors
Static collectors are located on both front
wheels. Their purpose is to discharge the static
electricity generated while the car is in motion.
An inoperative or inefficient static collector may
cause a cracking noise in the radio when the car
is in motion. This noise will disappear when
the car is brought to a stop.
Front wheel static collectors consist of helical
coil copper inserts installed in the front hub
dust caps against the steering knuckle spindles.
The areas against which they are grounded must
be free of grease or oil to assure proper
operation.
Care must be taken when installing the dust
cap to bend the steering knuckle nut cotter key
around the shaft, rather than over the end of the
shaft, to prevent the static collector from catching
on the cotter key and breaking.
b. Ignition Suppressors
Various types of ignition suppressors are used
to prevent spark noise from interfering with
radio reception. Failure of any of these parts
to function properly is accompanied by a popping
noise. The noise increases as the engine is
accelerated, and varies with engine speed. If
this interference is present, check the following
suppressors:
1. Ignition noise is suppressed by use of re-
sistance core ignition cables. Check for a de-
fective or open cable. The resistance of these
cables is 2,000 to 6,000 ohms per foot. The use
of the secondary efficiency test, Section 12, Note
24, is helpful in testing for defective ignition
cables.