Table of Contents
Advertisement
16-28
GROUP 16-VENTILATING, HEATING, AND ACCESSORIES
(322)
matic position. A slight downward
pressure on top of the switch to
a detent provides upper-beam, re-
gardless of light on the phototube
unit. This arrangement permits sig-
naling the approaching driver if he
fails to switch to lower-beam and
also provides a simple test for Auto-
matic posrtton of the foot switch.
Street lights, encountered in the city,
are usually sufficient to maintain the
vehicle headlights on lower-beam;
however, the upper-beam may be ob-
tained when needed by holding foot
pressure in the over-ride position.
In the lower-beam position of the
EJ
IN-CAR ADJUSTMENTS AND REPAIRS
Be certain that headlights and
windshield are free of snow and dirt
for proper operation of the auto-
matic headlight dimmer.
PHOTOTUBE UNIT VERTICAL
AIMING PROCEDURE
. The phototube unit must be accu-
rately aimed vertically. If the unit is
aimed too low, back reflections from
the headlights which are being con-
trolled, will lock the amplifier on
lower-beam. However, the unit must
be aimed as low as possible to pro-
vide maximum tolerance for car
loading.
1. Phototube unit vertical aiming
should be done with the car un-
loaded, trunk empty except for spare
tire, gas tank at least half full, and
with tires at the correct pressure.
2. Locate the car on a level floor
(level within
1
.4 inch fore and aft of
the car).
3. Rock the car sideways to equal-
ize the springs.
4. Install the aiming device, part
of the tester on the phototube unit
(Fig. 2) . The three-points on the
aiming device must be resting on
top of the phototube unit, and the
aiming device must be touching
the front of the phototube unit.
5. Observe the number stamped
on the driver control knob rear face.
AIMING DIAL
VERTICAL AIM SCREW
FIG. 2-
Vertical Aiming Device
Adjust the aiming dial until the cor-
responding number is under the
pointer.
6. Adjust the vertical aim screw
on the phototube unit until the bub-
ble is centered in the level.
HOLD AND DIM SENSITIVITY
ADJUSTMENTS ON CAR
Hold sensitivity must be prop-
erly adjusted before adjusting Dim
sensitivity. The phototube unit
must be covered with a black cloth
during adjustments. Adjustments
should be made with the phototube
unit temperature below 90°. If the
car has been in the sun immedi-
ately prior to checking, allow it to
cool in a covered place for approxi-
mately one hour before the ad-
justment is actually made.
PREPARATION FOR
ADJUSTMENT
1. Set the driver control to the
Detent position.
2. Install the tester lamp (Fig. 3).
Cover the tester lamp and phototube
with the black cloth furnished.
3. Start the engine and operate it
at fast idle while making adjust-
ments.
4. Turn the headlights on and wait
at least five minutes for the ampli-
fier unit to stabilize. Place the foot
switch in the Automatic position.
5. Turn the zero corrector, on the
face of the meter, until the meter
pointer is on the zero set line.
6. Turn the tester intensity control
counterclockwise.
7. Connect the battery leads of the
tester to the battery terminals. (Red
lead to the positive terminal and
black lead to the negative terminal.)
HOLD SENSITIVITY
ADJUSTMENT
1. Rotate the amplifier Hold com-
pletely clockwise.
2. Rotate the tester intensity con-
trol all the way clockwise.
foot switch, the automatic headlight
dimmer is not an active part of the
headlight circuit. However, it is not
turned off. It continues to function
as long as the headlights are turned
on and is ready to provide automatic
control whenever the foot switch is
returned to the Automatic position.
3. Turn the dim-hold switch mo-
mentarily to the Dim position to
switch the lights to lower-beam, then
switch back to the Hold position.
If the lights do not switch to lower-
beam, the amplifier dim -control
must be turned completely clock-
wise and then readjusted after
Hold adjustment is correct.
4. Adjust the
intensity
control
slowly counterclockwise until the
meter pointer is on the Hold sensitiv-
ity adjustment line.
5. Turn the amplifier Hold control
slowly counterclockwise, just to the
point where the headlights switch to
upper-beam. Do not go beyond this
setting.
6. Turn the intensity control all
the way clockwise.
7. Tum the Dim-Hold switch to
Dim position and back to Hold posi-
tion to obtain a lower beam.
8. Slowly turn the intensity control
counterclockwise just to the point
where headlamps switch to upper-
beam. The meter pointer should now
read in the green. Hold sensitivity
range on the meter scale (Fig. 3).
If not, return to step 1 and repeat
all steps.
Aiming Device, Model
Tester
lamp
No. 6-J·
J-8674
K1536-A
FIG.
3-Dim
and Hold
Sensitivity Tester
Advertisement
Table of Contents
Troubleshooting
