Western Auto Supply Co. D1176 Schematic

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Product Information:
Model:D1176
Manufacturer:Western Auto Supply Co. (Truetone)

Schematics Content:

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Page 1:

"w ??ib?t9$?of the Auto-

matic Station Mechanism. Five of
these are Automatic Station posi-
tions and one is the Manual Tuning
position. A sixth station may be
tuned in with the Manual Tuning
Knob. If the position of this knob
is not disturbed, the sixth station
will be automatically tuned in when
the Automatic Station Mechanism
is in the Manual Tuning position.

The different positions are reached
by pushing the Automatic Station
Knob iimily and gently.all the way
in and releasing this knob so that
it snaps all the way back. Pushing
in the knob once in this manner will
advance the mechanism to the next
position, twice will move it to the
second position, etc.

When the radio is in the Manual
Tuning position, the Automatic Sta-
tion Knob is dark. When it is in

any of the 5 station setting posi-
tions, the Automatic Station Knob

Five stations may be set for Auto-
matic Tuning. A sixth station may
also be automatically tuned in at
the Manual Tuning position as ex-

Make a list of your favorite sts-
tions, those which you tune in regu-
larly. There may be any number up
to and including 6 in this list.

It is better to list the stations in
frequency order.

Any station setting position may
be used for any station you can
receive although it is better to put
the stations on your list in frequency

WESTERN AUTO SUPPLY CO.

Procedure for Setting the Stations

First get the mechanism in the
matic Station Knob.is` dark, it is
already in this position. If the Auto-
matic Station Knoh is illuminated,
depress this knob one or more times
until it is dark.

Select the Erst station from the list
you have made and carefully tune in
this station by rotating the Manual
Tuning Knob. Determine what pro-
gram is being broadcast.

Then advance the mechanism to
position No. 1 by depressing the

Automatic Station Knob once. As
shown in Fig. 3, there are 5 small
holes in the chassis case through
which the station setting screws are

Insert a small bladed screwdriver
in the opening for setting screw No.
1 and turn this screw in or out until
the desired station (the one previ-
ously tuned in) is heard. Turning
the screw in (clockwise) will tune
in stations with lower kilocycle num-
bers while turning the screw out
(counter-clockwise) will tune in
stations with higher kilocycle num-

There is a card supplied with the

radio on which is a frequency scale.
Using the screwdriver as a guide,
this scale will show the approximate
frequency (kilocycle number) at
which the setting screw is set.

Issue A
MODELS D1145,D1176

Be sure not to tune in some Vother
station broadcasting the same pro-
gram. Turn the screw slowly back
and forth until this station is care-
fully tuned in to the clearest and
loudest point. The final motion of
the setting screw should be to the
right (clockwise). The station is
now set for position No. 1.

Next advance the mechanism to
position No. 2 by depressing the
Automatic Station Knob once more.
Tune in the second station on your

list by adjusting setting screw No. 2
as explained above.

If you have diHicuIty in knowing
when this station is tuned in, push
the Automatic Timing Knob 4 times
to reach the Manual Tuning position.
Then tune in this station with the
Manual Tuning Knob, noting the
program that is being broadcast.
Push in the Automatic Station Knob
twice to get the mechanism back into
position No. 2 and again tune in this
station by carefully adjusting setting
screw No. 2 until the station is clear-
est and loudest.

Proceed in like manner to set any
remaining stations on your list.

Fa 5-nom'o Tubq md vibrator

Power Consumption

Power Output - ~ - - -

Intermediate Frequency - -

Speaker - - - - 6" cmd 8"
Tuning Frequency Ronge

B Range - - - - - - -

D Range - - - - - - -

Sensitivity _External Antenna-(For 0.5 Watt output)
- 4.0 Microvolts Average
lD Mimovolts Average

50 Watts (At ll7 volts 60 cycles)

80 Waits (Phonogroph Operating)
2.5 Watts Undisiorted

' 3.5 Watts Maximum

seleg?svify - _ 40 Kc Broad m 1000 umes signal

qSPEAKER SOCKET

Q'Joim r. Rider

Page 2:

WESTERN AUTO SUPPLY CO.

TONE

mga; 963m 3 Egg 52 Tom M8 M2 i. ?
:M _ _ Elsie a.: :3.95:
55% 15.3% 513 _ "___ mes 3.. ws "5% QE . ` _

(C)John F. Rider

Page 3:

MODELS D1172,D2149
Issue A

MODELS D1145,D1176
volume connoI-mimm All Adinsnmm I

a Short Heavy Load.

WESTERN AUTO SUPPLY CO.
AUGNMENT PROCEDURE FOR MODELS D1172,92149,D1145,D11'le

Tha Iollowing aquipmanf ir required for aligning:

com-WI has., clams; 'a emma rmI aI Signal emma wah

An All Wave Signal Generaior wIIi

ch wi|| provide an neural*er

calibrahd signal a# IIIe #asf frequencies as lisled.

minuies. Dummy AnIennaI-.l mL. |00 mmf.. and 4m ohms.,
SIGNAL GENERATOR BAND
FREQUENCY CONNECTION DUMMY SWITCH ADJUST TRIMMEIIS TO
SETTING AT RADIO ANTENNA SETTING CONDENSER SETTING MAXIMUM
456 KC Grid af Isl Dei. .I url. B Range Turn Roisr Io Full Ops;v 3rd LF. (CIS) I( (CN)
RANGE B Ami."
|600 KC Lead |00 mmf. B Range Turn RoIor Ia Full Open Oscillator Range B (Cl l)
Turn RoIor Io Mex. Ouipu'
Moo Kc Annu... sn Indie-nn In me Kc- Am. Rang. a (ce)
Land IW mmf. B Range See NaleA
Lead |00 mmf. B Ranne Tum Roiar Io Mu. Ouipuf Reel( Rohr-Gee Nole B
RANGE D Mmm.
|8300 KC Lead 4M Ohm D Range Tum Roiorio Full Open Oscillator RangeD (C4)
I'I.000 KC Lead 4m OIIIII D Range Turn Roior Io Mn. Ouipuf Rock Ronan-5M NoIe B
LOOP RANGE B
"0? Kc msn" IN mlni. B Range Turn Rohr fo Max. Ouipui Ant Range B (ca)

FRONT 0F CHASSIS

TRANS. TRANS

AIhnuaIe Ina signal from IIIe signal glee'-

Aerr eacII range ix complahd, rupee! lie

NOTE A-lf IIIe poinief is not af MW Kc
on III. die, remove poinier from drive cord.
Sef poinier af IIIe |400 KC Inari on I'IIe dial
scale. AhabII poinIer Io drive nord.

NOTE l-Turn Ihe roIor back and MII and

CAUTION-When aligning *Ile :had 'an
bends, Be sure NOT Io adiud el III. image
frequency. This can be :lseek-d as follows:
Lei us say `IlIe signal genuaior is se# for

power Consumption squnsw m von: so mm;

chassis) around

|1000 KC. The signal will iIIen be IIeerd aI
|59" on lhe dial of Ihe radio. TIIe image
signal. v'th is much weaker. will be IIa-rd e!
lim lei "I KC. or HJIBB KC Ml IIIe
signal Io lIear the image.

DRIVE CORD REPLACEMENT

Tum gang condemn Io Iull open poinion-
See illudraIion. Use a new drive cord 42

Tie one and M card Ie Iensian spring.
Peas oils" end of cord up IIIrougII hole In
groove of drive pulley. Pull card IIIrougII
IIoIo nnIl spring is Bush againsI inside #I
piley rim

Wind card ll, fum eounhr-aloglwin (Irom
puley side af chassis)
Then wlnd 4|/1 hm: clockwise (from fronI of
Should progress 4Inward chassis.
cord our idler sluds A and I a; |hown, Ihen
fum wunler> 10 limit: Average

&"PHONO MOTOR
SOCKET SOCKET

EXTERNAL
ANTENNA

COIL TERMINA L S

(C)John F. Rider F'

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