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POLARITY
REVERSE
The polarity reversing plug must be positioned correctly before
installing your radio or making any electrical connections
to the
radio.
Set the polarity
plug to the positive
noneen if the
positive
terminal of the battery is grounded to the car.
Set the polarity plug to the negative
position if the negative
terminal is grounded to the car.
Damage
to the radio may
result if polarity plug is not posi-
tioned correctly before operating.
ALIGNMENT
PROCEDURES
A)
AM SECTION
@) ANTENNA TRIMMER ADJUSTMENT
With radio installed
in car
and
auto
antenna fully extended,
tune in a weak station near
1400Kc
and
adjust CT-3
for maxi-
mum
output. (Fig. 1)
While this adjustment, one of AM push-buttons
must be push-
ed in for AM
operation.
©
@
q
QL
Trimmer CT3
Antenna lead
Fig. 1
6b)
ALIGNMENT
PREPARATIONS
Check
power
supply
voltage
(13.2V)
and
ground
polarity.
Signal
generator
output:
Modulation
frequency
400cps Per-
centage modulation 30%
Signal
level
just high
enough
to
provide meter
deflection.
Signal supply inlet:
Antenna
receptacle
through
the
dummy.
Output meter connection:
Across the speaker
or dummy
load
(4 ohms).
SIGNAL
GENERATOR
COUPLING
IF ALIGNMENT
SIGNAL
RADIO
GENERATOR
DIAL
FREQUENCY
SETTING
ADJUST FOR
MAXIMUM
OUTPUT
Low frequ-|
IF transformer
ency end
Ti,
L12, FIs;
stop
T14
Thru dummy
1.
to antenna
receptacle.
RF ALIGNMENT
Oscillator
coil
T10
Oscillator tri-
mmer
CT5
Antenna trimmer
1400Kc
|CT3
RF trimmer CT4
Thru dummy
600Kc
600Kc
to antenna
receptacle.
1400Kc
1400Kc
1400Kc
2,3 and 4.
*Repeat steps 1,
NOTE:
Alignment is usually
to be taken
at points of 600Kc
and 1400Kc, but it may
be possible
to obtain
530Kc
to 1605Kc
tuning
range
by
adjusting at both
lower
and upper end of receiving band.
ALIGNMENT
CONNECTION
ee
STANDARD
Het
auto FN
SIGNAL
60pF
V
GENERATOR]
pam
Se
as
Dummy
.B) FM SECTION
@)
CURRENT
ADJUSTING
OF RF STAGE
- Adjust
the
VRI1
(100k)
for
the
collector
current
of Trl
(28A440) to be 750pA.
6)
FM IF ALIGNMENT
oS vsing a sweep
marker
generator)
HOW
TO | Elements
step | Generator) DIAL | CONNECT | to be
ELEMENTS
eee
S. M. G.__|
Adjusted
Point
Output ter-
Tl
Adjust for maxi-
of ne
minal to
hn
mum
gain and sym-
1
10.7Mc
inter
antenna.
Ts.
metric response
_,|
Input ter-
curve as shown in
ference |
— .
:
.
minal to
Fig. 3 with marker
points Tpl
on the top center.
and Tp2.
3
Output ter-|
9
Adjust T9 to get.
minal to
crossover
curves
2
10.7Mc
antenna.,
having striaghtness
Input ter-
and to orient the
minal to
marker at crossing
points of
Point (Fi8. 4)
Tpl and R29
c)
#M RF ALIGNMENT
Connect
FM
signal generator
thru
the dummy
(Fig. 5) to
antenna receptacle.
GENERATOR | .
DIAL
STEP
Adjust CT2 for maximum
gain.
Lowest
Adjust CT1
for maximmm
gain.
'5
Confirm overall tuning range to be
from 87Mc to
108Mc.
Repeat steps 1 thru 5 until no further improvement
can be made.
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