Westinghouse W-1516 X, 420A, 512A, 512X, 512Y Service Manual

...

1029Y

1029X

B826X

823Y

823X

W622Y 8725X

RADIO SERVICE MANUAL

PRICE

$1.00 1936-1937

RS -250

W521X B624X

W91 4Y

B51 7X

CANADIAN

WESTINGHOUSE

W622X

W914X

W512Y

W527X

B819X

W512X

ts16x

W813Y

W511X

W1015Y

W813X

W1015X

6718X

W 465 X

D BUMR

RACV

POWER TRANSE

(

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lsl I.F. TRANSE

117

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DIAL LAMPS

SP, MM,MU

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BLACK

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TONE CONTROL

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607

RANGE SELECTOR

IDO RAW SELECTOS

C.MQTIMI WORM

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6 MFD VOLUME

CONTROL

RI? 2-5 MEG TOTAL

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11,

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RIO 82000.

RID

MEG.

ANT

25,NOa

WIRING DIAGRAM

See notes under Schematic Circuit Diagram

W84

BLACK

525

270,000.

470000

6F5

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034

535

037 DSO.

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56,000

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625

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RI0

82,000

56 000

0.R

22 MEG

C013

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2,1

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26N

aAV C.

0.14

220,000

0.15

41 MEG

1D30

T05

MFD

0.20

39000.

0.18

250.00

0.19

83.000

C33+

Gro

27000.

122

0.21

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0.11

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0.25

270000,.

181

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84 133391M

346 3403 MAW

843

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11"450

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7400 MmF

1114.275

1 f0

:51 50 Mfg

833

56730.

RANGE SE 13):512 SNOWY 18 SHORT WAVE 4051TIGN

Cis

14.0 MID

TO ALL HEATERS

I DIAL LAMPS

10000.

FIELD

81VVVV,

6-56

30. MFD

ID.

TUNING MBE

6E5

832 I.MEG

Schematic Circuit Diagram and Reproducer Wiring Diagram

Notes:-

I. On later production the heater winding is grounded at one side instead of

at centre.

The grounded point is contact No. 2 on the W -6H6 socket. 2.

The lower end of

tone control R27 was also changed to go to chassis frame instead of to positive plate supply ter-

minal. The chassis wiring diagram is up-to-date.

0.33 56. 8-34

11. R35 11..

C5?

- IS. MFO

SPEAKER

i CABLE

sis

000 A

640 #9

05 MID

000A

100.000.

HUM

FIELD

NTR.

YCWL

RED & BLACK

RED & YELLOW

RED.

RED

TRANSE

142

07 MFD

BLUE

811

ANT.

WESTINGHOUSE MODELS 1015X & 1015Y

YELLOW

RACK

YELLOW

OSC

10 t51+---YEIIO

IOS 10 E.

ELI:-

THE WY TERMINALS SHOWN

DOTTED ARE lASTENED TO THE

COIL TUBE ONLY

DI 5M

nSnkaM

THRONES 6M6

70 flSTE'1 OF 6116

BLUE

1111

I -p MAP

RED ---+10aOCR

181-T2 MAW

7112MMF

BUS-{Q,

145 1-121611

1-11

1300

BUS--üQ 144101116

646

1400

-SUS 1-41 1-010311

_....10011,17100E

CAM1ODE

YELL

SWITCH SECTIONS ARE

SHOWN IN MWPOSITION

Ca 6 149

Range Selector Wiring Diagram

I.F. Amplifier:

The intermediate frequency amplifier consists

of 2 W.6K7

tubes in a two stage transformer coupled circuit.

The windings

of all three I.F. transformers are resonated by fixed capacitors

and are adjusted by moulded magnetite cores, (both primary

and secondary) to tune to 460 Kc. A third winding, L15, in

the first S.F. transformer is placed in aeries with the mein secon-

dary L14 when the fidelity control switch 8-8 is thrown to the

"broad" position (see schematic diagram), thereby increasing

the coupling between the primary and secondary circuits with consequent broadening of the band width of the I.F. amplifier. The increase band width of the I.F. amplifier therefore causes

less attenuation of the higher audio modulation side band fre-

quencies, permitting higher fidelity reception.

Second Detector and A.V.C.:

The modulated signal, as obtained from the output of the i -f

system, is detected by one of the diodes of the W -6H6 tube,

Audio frequency secured by this process is paned on to the

control grid of the W -6F5 for amplification before final reproduction. The d -c voltage, which results from detection of the signal,

is sad for automatic volume control.

This voltage, which

develops coron resistor RI4 is applied as automatic control grid

bias to the first detector and i -f tube. through a suitable resistance

filter.

The other diode of the W -6H6 tube is used to supply normal

bias to the fret detector and id radiotrons until such time as the rectified signal voltage is great enough to overcome the normal hiss voltage and start the automatic volume control

action.

A portion of the range selector switch (8.7) is used to change

the minimum bias on the radiotron controlled by the AVC

voltage, so as to reduce the minimum bias and increase the

sensitivity of the receiver on the "medium wave" and "short

wave' position.

R.F. Alignment Points

When adjusting the Air Dielectric R.F. trimmers, it is necessary to use a special tool (See H-29644 in parts list) to slacken the lock nut on the trimmer, previous, to the adjustment, and to

tighten it again after the adjustment.

.mother special tool

(See H-29643 in parts list) is available for making the actual

adjustment to the trimotor.

The adjustment should be made

upward or downward on the plunger with a twisting motion -

The special tool designed by the Canadian Westinghouse Com-

pany for this purpose is double ended: one end having a pin for

the R.F. adjustments, the other end is a special socket screw

driver for use in making I.F. ad ustments.

1500 AC. 41

5000 KC.

17000 KC. ®

I500 KC. *

5000 KC, 0

17000 KC. ®

1500 KC. OO

5000 KC. ®

14000 KC, ®

[E11

lE1ll-1

600. KC

SERIES TRINiN1ER

ANT.

DET.

DSC.

The procedure outlined below should be followed in adjusting

the various trimmer capacitors and molded corn:

WHEN ALIGNING THE R.F. CIRCUITS, THE CHAS-

SIS BOTTOM SHIELD MUST BE IN PLACE ON THE

CHASSIS AND SECURELY FASTENED WITH ALL OF

THE RETAINING SCREWS.

IF THE CHASSIS BOTTOM

PLATE IS REMOVED, COIL SHIELDING WILL BE IN-

COMPLETE AND THE R.F. CIRCUIT WILL OSCILLATE.

WHEN ADJUSTING I.F. CORES WITH THE CHASSIS

BOTTOM PLATE REMOVED OR DOING TROUBLE

SHOOTING ON THE CHASSIS, OSCILLATION MAY BE

PREVENTED BY USING A SHORT LENGTH OF WIRE

WITH TWO CLIPS TO CONNECT TOGETHER THE PAR-

TITION SHIELDS BETWEEN THE ANTENNA AND

DETECTOR COILS, AND BETWEEN THE DETECTOR

AND OSCILLATOR COILS.

I.F. ADJUSTMENTS USING CATHODE

RAY EQUIPMENT

Set up the Cathode Ray Equipment in the manner

re-

commended

mended by the ,manufacturer of the equipment.

The fre-

quency modulated oscillator should be connected to the control grid cap of the W -6K7 second I.F. radiotron (with grid lead in

place), through a .001 Mfd. capacitor.

The grounded side of

the test oscillator output should be connected to the receiver

chassis frame.

The cathode ray oscillograph vertical terminals

should be connected to points indicated on the radiotron socket

voltage diagram.

Place the receiver in operating condition with the fidelity

switch on the tone control in the counter -clockwise or selective

position.

The antenna and ground terminal should be short

circuited and if necessary the gang condenser adjusted so that

no stray signals are fed into the I.F. amplifier during the adjust-

ment.

Adjust the test oscillator to supply a 460 Kc. audio -modulated

signal.

Increase the output of the test oscillator until a deflec-

tion is noticeable on the oscillograph screen. The figures ob-

tained represent several waves of the detected signal, the ampli-

tude of which may be observed as an indication of output. Cause the wave -image formed to be spread completely across the screen

by adjusting the "Horisontal gain" control. The image should

be synchronized and made to remain motionless by adjusting the

proper oscillograph controls.

Adjust the two magnetite core screws of the third I.F.

transformer (see radiotron socket voltage and I.F. terminal

location diagram) to produce maximum vertical deflection of the

Bcillograph image.

This adjustment places the transformer in

exact resonance with the 460 Kr. signal.

Set up the cathode ray and test oscillator equipment in

the standard manner to provide a frequency modulated signal

and a "double trace" image.

Adjust the frequency of the test oscillator until the two

traces move together and overlap with their highest points

exactly coinciding.

Now readjust the two magnetite core screws on the third

I.F. transformer so as to cause the two traces on the oscillograph

screen to coincide throughout their lengths and have maximum

amplitude.

Without altering the adjustments of the apparatus, shift

the "Ant." output of the test oscillator to the control grid cap

of the W -6K7 first I.F. radiotron (with grid lead in place), through

the .001 mfd. capacitor.

Adjust the test oscillator output so

that the amplitude of the image is approximately the same as

used for adjustment (6) above.

The two second I.F. transformer magnetite core screws

should then be adjusted so that they cause the forward and re-

verse traces to become coincident throughout their lengths and have maximum amplitude.

Without altering the adjustments of the apparatus, shift

the "Ant." output of the test oscillator to the input of the I.F.

system; i.e., to the grid cap of the W -6L7 first detector (with grid lead in place) through the .001 mfd. capacitor.

Regulate

the test oscillator output so that the amplitude of the oscillograph

image is approximately the same as used for adjustment (8)

above.

10. The two first

I.F. transformer magnetite core screws

should then be adjusted so as to cause the forward and reverse waves to become coincident throughout their lengths and have

maximum amplitude.

11.

Note width of oacillographic image at a point which is

50% of maximum amplitude.

Turn receiver fidelity control to

extreme clockwise position (high fidelity position).

Note width

of oseillographic image at a point which is 50% of maximum

amplitude.

Under normal conditions the Tatter measure,nent

should be approximately 60% greater in width than the former

measurement.

The image should also appear slightly double

humped.

These conditions indicate proper broadening of the

band width of the I.F. amplifier.

12.

Turn range selector to "Medium wave" position and

note increase in amplitude.

The amplitude should increase

several times.

It may he necessary to decrease output of test

oscillator to keep image on screen.

I,F. ADJUSTMENT WITHOUT CATHODE

RAY EQUIPMENT

In most cases provided the I.F. transformers have not been

very badly put out of adjustment, it is possible to secure reason-

ably good results by alignment with a simple 460 K.C. audio

modulated oscillator and standard output indicator.

The adjust-

ment should be made in a similar manner described fhr the

cathode ray equipment, but of, course, the I.F. cores should be

adjusted for maximdm output indication only.

The adjustments

must be done in the order given and must be done carefully or unsatisfactory operation of the high fidelity switch will result.

No attempt should be made to adjust the I.F. cores with the high fidelity switch in the clockwise or "broad" position.

R.F. ADJUSTMENT

Before attetaptiag R.F. alignment it

is necessary to set the

pointer in the correct position with relation to the gang con-

denser plates.

This is done by setting the pointer to the angle

of the border line of the dial immediately below the 530 K.C.

calibration point, with the gang tuning condenser in full mesh.

"Short -Wave" Trimmer Adjustments

Connect the "ANT" output of the test oscillator to the antenna

terminal of the receiver through a 400 ohm resistor.

Set the

receiver range selector switch to its "short wave" position and

its dial pointer to 17000 Kr. Adjust the teat oscillator to 17000

Kr. Adjust oscillator 17000 Kc. trimmer until maximum output

is reached.

Two peaks may be found with this circuit.

The

peak with minimum capacitance (plunger nearly out) should he

used.

Tighten lorknut.

Adjust detector 17000 Kc. trimmer

until maximum output is reached while slightly rocking the gang

condenser. Two peaks may be found with this circuit; the peak

with maximum capacitance (plunger nearly in) should be used.

Tighten lockout.

Adjust antenna 17000 Kc. trimmer until

maximum output is reached, while slightly rocking the gang

condenser.

Two peaks may be found with this circuit; the peak

with maximum capacitance (plunger nearly in) should be used. Tighten lockout.

Check the image frequency by changing the' receiver dial setting to 16,080 Kc. the image signal should be received at this position, indicating that the adjustments have

been correctly made.

No adjustments should be made while

checking for the image signal.

ADJUST ALL LF TBM6F.

MJM.r,SEf}.

TD 46a.

AB. S10M

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617617

BOTTOM OCAS MOSS

'coma 15111113-aY RIeEEN

INK IERMNSL Am 11151115

Radiotron Socket Voltages and I.F. Trimmer Locations

The meter readings

given

inthe diagram

wetaken with the

and

and bandies

posts

hort circuited

nd with 1010 vats

antenna

All reading* .re actual

perating conditions sod In sums cars

r'll be nec.ry to

allow for meter resistance.

All D.C. voltage

ead diallowings

are taken with respect to the chassis triune.

All «tllngs .re

-Iit -14..

nnn

given for normal operation-

If readings are taken with a set umbrae.

circuit. that are not intended to wcA,ate. may

smote. thus

increments

r .mean vmemar and derre.aing plate st rreen .solemn

The

aalyrt able may aim uur de

decreasing

rolls.,

to cease

oscillating. en`,. increasing current .m aerre..ma ynlwe.

In some cases the socket contacts of "blank" radiotron pins are used as terminals for chassis parts.

The voltages shown above

on such contacts are circuit voltages, not radiotron voltages.

CANADIAN WESTINGHOUSE MODELS 1029X and 1029Y

1st no,

¡w¡

6LT

In OCT

PO °O

I di

sera

IIM.we

Os..

n«e.

ENT

Inca

657

O.v

O ten

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_.lor

: CS

tee

irle irle

.u0

se0

6N6

Y. AVDrt

5T4

secr.

Opp

Ol ooco- ./

*FS

AUDIO

aR Ai

rn<CO ,

í&i°s

n ZS

wzm

Ta er,&a

WHEN RECEIVER IS CORRECTLY TUNED IN

I.F. signal devel-

oped here is 460 k.c.

and this voltage

t) is applied

across

points A and B.

(DVoltage

ai:iááNRaa

o.11. awn d volt,

He &paliad across

point.A.Band volt.

oree ,poled acrom

suer lulydLES.

Voltage actna a.

} W

diode No.

M voltage

vgeanarinwn

half or cod Lxs.

Schematic Circuit Diagram

The croon M L25,

r.x+and C33

s uned

In 50 K.C. and is in

resonance with the in.

(lured voltage.

The induced voltye

a...

hallo(

L25

batten equ

each

phase

relation with respect to

the

voltage appliedl-

rectified

egn..

RI2 and

equal npxts.

the A.

C. volt..

nanc to ground ú

R10. 04.

A.F.C.

moos.

1.0 MEG

tnC.33. `s

ytwC3K.

y-200

MMF.

R.li

DIODE

OF W6H6

g10000

¡\

L-278

I.F. signal devel-

oped here is 465 k.c.

and

this

voltage

applied across

points A and B

0.11.

451070

OFF

°ON

Sor

cx.

Rau. VOL^

UME

2211:0u

Cgl.

CONT.

01--10D

R 15. O$C

CONTROL

MEG.

WAGS

GRID

WR.F DET.

AND IF.

GRID BIAS

The circuit of 1.20, 1.26 and C33 is

not in

rmonance

with the

induced

voltage.

This< canna

the voltage atm..the

upper half

of L25 to become more

nearly in phase with the voltage ap-

plied emcee A and B and increases the

rectified

voltage

acre. R13.

It also

the voltage across the lower half

of L25 to become further out of phase

with the voltage applied across A ant

WHEN RECEIVER IS INCORRECTLY TUNED IN (5 K.C. HIGH)

B and deºeaas the rectified voltage

scree. RI2.

Consequently the result-

ant voltage from Ctogrotmdi.ptaitive.

R -I1.

MEG.

R-27.

6L6

OUTPUT

1.19

(Arid of control tube is

connected to a point on

the oscillator

tuned

cir-

cuit and the plate is con-

nected to the "high" end of

the oscillator tuned circuit.

The phase relations are

such

that

the

amplified

voltage developed on the

plate has the same effect

as an inductance in parallel

with the tuned circuit.

C14.

tA MMF

R-7.

1 33(02

~if

y...,211.

MMF.

MÍEF

15V.

This positive voltage de-

creases the bias on the control

tube and increases the am-

plification.

This

has

the

effect of increasing the equi-

valent inductance seroso the

oscillator tuned circuit and

consequently lowers the os-

cillator frequency so as to

correct the error in dial set-

ting.

DETAIL OF AUTOMATIC FREQUENCY CONTROL

CIRCUIT

g Ca1.

SM MMF.

C10.

11-SqMMF.

GS2

C11

470 MMF.

111MMF. To

OS:..

GRID

When the receiver is tuned too low, the A -Ft. voltage becomes negative, and results

in an opposite corrective effect on the

oscillator frequency.

It will be noted that the automatic frequency control is applied to the broadcast band only

and that two *witches 8-4 and 3-7

are provided to short circuit the automatic frequency control voltage when its presence

is not desired. One switch S-7 is mounted

so that by an inward motion while turning tfie station selector the A.F.C.

voltage is removed, thus permitting the station to be

tuned without a "dragging" effect that would otherwise exist if the operator attempted to tune past a

powerful station to pick up

weaker one.

IS MED.

111v.

rJytllllll111111.1J11.111JJJJJJJi1.14.14111111.1.111.1.11114.tIrJJJJa.1aJJ3111aaJ1a4i1raaaJaai1aia41iilr

TUNING

INDICATOR SOCKET

CABLE ASSEMBLY

BASS

TONE

CONTROL

AND

POWER

SWITCH

LAMP SOCKET

ONLY

TREBLE TONE CONTROL

ANT. COILS

AND

SWITCH RE

GRID

RF COILS

AND

SWITCH

PIE

-L-vEllow-

OSC. COILS

AND

SWITCH PIE

RANGE SWITCH

CONTROL SHAFT

19M 25 MI

AUTO FRED sA

CONTROL

AUTO FREQ

SW:TCH

31 MI

49M BC

VOLUME

CONTROL

2.5 MEG. TOTAL

BROWN

GRID

r__D_

PRONO

TERMINAL-'

8OARD

POWER

CABLE

Chassis Wiring Diagram

I10

MMF

T'ANSFORMER

2ND

TRANSFORMER

1sT.

TRANSFORMER

ALIGNMENT PROCEDURE

There are various alignment trimmers provided in the detector

and oscillator coil tuned circuits. The i -f transformer adjustments

are made by means of screws attached to molded magnetite cores.

411 of these circuits have been accurately adjusted during manu-

facture and should remain properly aligned unless affected by

abnormal conditions or altered during servicing.

Loss of sens-

itivity, improper tone quality, and poor selectivity are the usual

indications of improper alignment.

The correct performance of this receiver can only be obtained

when the aligning has been done with adequate and reliable

apparatus.

It is not necessary to use a frequency modulated

oscillator and cathode ray oscillograph to align this receiver.

Those service men that have this equipment will probably prefer

to use it and for their convenience we have indicated on the

trimmer location diagram the proper connection point for the

cathode ray vertical amplifier input terminal.

A test oscillator is required as a source of the specified align-

ment frequencies.

Visual indication of receiver output during the

adjustment is necessary and should be accomplished by the use

of an indicator or meter.

The procedure outlined below should be followed in adjusting

the various trimmer capacitors and molded cores:

Calibrate the tuning dial by adjusting pointer to the low

frequency end of scale with gang condenser plates fully meshed.

The pointer may be adjusted along the phosphor bronze drive

cable by slackening the stud which secures the glider to the phos-

phor bronze drive cable.

Perform alignment in proper order as shown by the accom-

panying chart, starting with No. 1, and following all operations

across, then No. 2, etc.

The chassis bottom shield must be

securely in place when making R.F. adjustments. Adjustment

locations and fequencies are shown on a sticker fastened to the

bottom side of the chassis shield.

These trimmer locations are

also shown in one of the accompanying illustrations.

Connect the "low" output terminal of the test oscillator to the

receiver chassis for all alignment operations. Regulate the output

of the test oscillator so that minimum signal is applied to the

receiver to obtain an observable output indication.

This will

avoid a -v -c action.

The term "Dummy antenna" means the device which must be

connected between the "high" test oscillator output terminal and

the point of connection to the receiver in order to obtain ideal

alignment.

"No signal, 550-750 kc." means that the receiver

should be tuned to a point between 550 and 750 kc. where no

signal or interfrence is received from a station or the receiver

(heterodyne) oscillator.

The term "Rock Through" indicates that the receiver station

selector should be rocked back and forth while making the

indicated adjustment.

The adjustment and rocking should be

continued until the combined action results in the maximum

deflection on the output meter.

When adjusting oscillator circuits that nave both series and

shunt trimmers it is good practice to repeat the adjustment on

the oscillator shunt trimmer after making the adjustment on the

oscillator series trimmer.

When calibrating the short wave "spread" bands (see operat-

ions 6, 9, 10 and 11 in the Alignment Chart), it is necessary to

have a very accurate source of test signal.

As there are no service

oscillators available at present with sufficient accuracy for this

calibration adjustment, it

is recommended that the respective

adjustments to L-16, L-17, L-15 and C-8 be made while listening to a short wave broadcast station of known frequency, approxim-

ately in the middle of the band being calibrated.

Operations

7 and 8 may be performed after operation 6 by setting the re-

ceiver to 11,800 kc. and tuning the test oscillator to the receiver

PRECAUTIONARY LEAD DRESS-(1) All

bare bus leads

adjacent to the R.F. coils or Range Selector Switch should be

as short and direct as possible.

(2)

All insulated leads adjacent to the R.F. coils should be

dressed away from the coils.

(3)

Heater leads should be tightly twisted together and dressed

away from grid leads of audio tubes to avoid hum pick-up.

(4)

Leads connected to phonograph pick-up terminal should

be tightly twisted together and dressed close to chassis frame.

(5)

Power output stage grid leads should be dressed away from

the high voltage secondary winding leads of power transformer t'.

avoid hum pick-up.

ALIGNMENT CHART

Order of

Align-

ment

Connection

To Receiver

Test Oscillator

Dummy

Antenna

Frequency

Setting

Receiver

Dial and

Range Setting

Master-

Manual Sw.

Position

Circuit

To Adjust

Adjust-

ment

Symbols

Adjust to

Obtain

Turn this screw all the way out.

A.F.C. I.F.

L 26

Check with mechanic's scale. This screw should protrude exactly % inch.

A.F.C. I.F. L 25

W -6K7 I.F.

Grid Cap

.001 Mfd.

460 kc.

No signal

550-750 kc.

Manual

2nd. I.F.

Transf.

L23, L24

Max. (Peak)

W -6L7

First Det.

.001 Mfd.

460 kc.

No Signal

550-750 kc.

Manual

1st. I.F.

Transf.

L21, L22

Max.(Peak)

W -6L7

First Det.

.001 Mfd.

460 kc.

No Signal

550-750 kc.

Manual

.. 2nd. I.F.

Transf.

L23, L24

Max (Peak)

Ant. Term.

400 ohms 11,800 kc. 11,800 kc.

Manual

Osc. 25M.

L16 Max (Peak )t

Ant. Term.

400 ohms

11,800 kc. 11,800 kc.

Manual

Det. 25M. C19

Max (Peak)**

8 Ant. Term.

400 ohms

11,800 kc. 11,800 kc.

Manual

Ant. 25M.

Max (Peak)**

Ant. Term.

400 ohms

9,600 kc. 9,600 kc.

Manual

Osc. 31M.

L17

Max (Peak )f

Ant. Term.

400 ohms

15,200 kc. 15,200 kc.

Manual

Osc. 19M.

L15

Max (Peak )t

Ant. Term.

400 ohms

6,100 kc.

Manual

Ose. 49M.

Max (Peak)*

Ant. Term.

200 mmfd.

1,500 kc. 1,500 kc.

Manual

B.C. H.F. Osc. C25

Max (Peak)**

Ant. Term.

200 mmfd.

600 kc.

Rock Through

600 kc.

Manual

B.C. L.F. Ose.

L20

Max (Peak)

Repeat 12

Repeat 13

Repeat 12

See instructions below for A.F.C. Alignment

L26.

* If two peaks obtainable use higher capacity setting.

t If two peaks obtainable use lower inductance setting (screw fur-

** If two peaks obtainable use lower capacity setting.

ther out).

ALIGNMENT PROCEDURE FOR A.F.C. I.F. TRANSFORMER

In the alignment chart the first adjustment given is to turn the A.F.C.

I.F. transformer tuning screw in coil L-26 all the

way

out so that the normal alignment adjustment may be made independently.

It is convenient at the same time to check the centering

of the core in coil L-25.

This is not an adjustment for tuning purposes, but merely to obtain equal

inductance in each half

of coil L-25 by accurately adjusting the magnetite core to the centre of the coil.

The final adjustment to tune the A.F.C. I.F. transformer to resonance with the other I.F.

transformers is as follows:

Using a standard antenna, and leaving the master -manual switch in the manual position,

tune in a powerful station, pre-

ferably a local, very accurately, using the tuning indicator to secure exact resonance.

With the test oscillator set and connected exactly the same as in the fourth operation

of the alignment chart feed a 460

K.C. signal into the first detector.

If the proper adjustments have been made there should be

a very low pitched beat note in the

loud speaker.

Slightly readjust the test oscillator frequency to secure lowest frequency,

or "zero beat" in the reproducer.

Turn the master -manual switch to the "master" position.

This will immediately change the frequency of the heterodyne

oscillator in the receiver and cause the beat note in the reproducer to become fairly high in

pitch.

Adjust the magnetite core screw in coil L-26 until "zero beat" is again obtained in the reproducer

output.

The A.F.C. I.F. transformer is now correctly tuned and switching the "manual-master"switch

back and forth should produce

no change in the reproducer output,

To check the operation of the A.F.C. circuit disconnect the test oscillator,

set the "master -manual" switch at "manual" and tune

the receiver approximately 5 K,C. away from a fairly strong signal. The quality

of reception will, of course, be poor and noisy.

Turn the master -manual switch to the "master" position.

The reception should immediately improve and correspond to that

obtainable from the same station when accurately tuned to resonance.

Trimmer Locations

AT RIGHT . .

(also see Socket Meter Reading Diagram)

Socket Meter Readings

BELOW

The meter readings given in the diagram

are taken with the antenna and ground bind-

ing posts short circuited and with 120 volts

line.

All readings are actual operating con-

ditions and in some cases it will be necessary

to allow for meter resistance. All D.C. volt-

age readings are taken with respect to the

chassis fame. All readings are given for nor-

mal operation.

If readings are taken with

a set analyser, circuits that are not intended

to oscillate, may oscillate, thus increasing

plate or screen voltages and decreasing plate

or screen current.

The set analyser cable

may also cause the oscillator radiotron to

cease oscillating, thus increasing current and

decreasing voltage.

6G5)

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441. CONDENSER

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Ot4

, ,E,I

Tux

+ sr.. .ao,.

LINE VOLTAGE

120 VOLTS A.C.

SPKR SOCKET

0606

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aw.

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460. K.C.

CONT.

BOTTOM VIEW Or CHASSIS

OTHER CHANGES

A.F.C. Alignment-Somewhat better results will be secured if in operation No. 1

(see chart) the core screw is

turned almost all in instead of all out as a greater amount of detuning is possible.

Length of Drive Cable should be 455í inches.

SHORT WAVE CALIBRATION

WESTINGHOUSE MODELS 1029-X, 1029-Y AND 1230-X

We have found that, during shipment, it is possible for the oscillator control grid lead in these receivers

to shift sufficiently to throw the short wave dial scales somewhat out of calibration.

When this occurs, the

calibration on all short wave bands will usually be found to have shifted in the same direction, that is, all four

dial scales will be high or all four dial scales will be low.

If such a condition is found, it will be a simple matter to correct it by rotating the oscillator control

grid clip so as to change the position of the flexible lead, checking the calibration on the short wave bands while

this is being done until the calibration is accurate within 5 K.C.

DO NOT LOOSEN THE CHASSIS MOUNTING BOLTS

ON WESTINGHOUSE MODEL 1230-X

Contrary to instructions attached to radio receivers from early production, these chassis mounting bolts

should not be loosened, as due to the slope of the chassis shelf, the chassis may sag on the rubber cushion

sufficiently to interfere with proper operation of the pushbuttons.

When it is necessary to remove a chassis

for servicing, the service man should be careful to replace the chassis as far forward as possible in the cábinet

and hold it in place while tightening the chassis mounting bolts and checking the pushbutton operation.

INSTRUCT YOUR CUSTOMERS IN THE PROPER OPERATION OF THE

REMOTE CONTROL USED WITH MODEL 1230-X

Lack of proper instructions at the time of sale may result in unnecessary service calls; for instance, the

customer may call up and say that a Model 1230-X is dead; "he has tried all

the controls and can't hear a

sound."

The trouble may only be that the toggle switch on the remote control has been turned to the "Off"

position.

The customer may forget this and attempt to operate the set the next time from the front of the

cabinet and wonder why no sound is heard.

If two or more buttons on the remote control are left pressed down and then the customer attempts

to operate the receiver by the buttons on the front of the cabinet, the tuning motor

will operate continuously

if any of the buttons on the front of the cabinet corresponding to the down button on the remote control are

pressed.

A similar result will be obtained if two or more buttons on the front of the cabinet are left pressed

down and the customer attempts to operate the receiver by remote control.

Another possible condition is as follows:

Assume that the controls have been correctly set and a station,

WJR, tuned in by the remote control.

Customer may leave control set at this position and turn the operating

switch off; the next time he operates the receiver he may attempt to do so by the pushbuttons on the front panel, neglecting to turn the "Manual, Button, Remote, Master" control to the "Button" position.

If the panel button also happens to be pressed for the same station, WJR, and another button is then

pressed, there may be an instant when the switch corresponding to the WJR panel button and

the other panel

button switch are both making contact.

This contact may last long enough to start the motor going but the

tuning mechanism will continue until WJR is tuned in again instead of the station the customer

is trying to

get incorrectly.

These conditions will be perfectly understood by a study of the wiring diagram of the electric tuning

and being familiar with them, you may be able to save yourself making unnecessary service calls by explaining

to the customer over the 'phone the proper method of operation.

the band.

anal lugs tight but place the

served on

of one of

OSCILLATOR INOPERATIVE ON STANDARD BROADCAST BAND

OF WESTINGHOUSE MODEL 1230%

This condition may extend over the whole band or only over

the lower half of

A possible cause is a poor contact between the

aluminum post and the term -

of one of the electrolytic condensers.

This lug may appear to be clamped

an imperfect contact may exist due to a

film of resin.

The remedy is to re -

electrolytic or remove it and repair it.

This condition has only been ob-

Westinghouse Model 1230X but may show up on other receivers.

CALIBRATION SHIFT ON STANDARD BROADCAST BAND OR

49 METER BAND OF WESTINGHOUSE MODEL 1029 and 1230

This may be due to an imperfect contact of the

wire lead to the moulded frame

the air dielectric trimmers.

This condition may be corrected by soldering.

WESTINGHOUSE MODEL 1230X

ELECTRIC TUNING

Principle of Operation

The electric tuning mechanism consists essentially of a

quick engaging and dis-engaging

reversible electric motor,

tuning condenser driving gear train, and eight mechanically

interlocked

(pushing one button releases

all others)

station

selector push buttons respectively wired to eight adjustable

station selector contactor discs (each with a motor stopping

insulated segment) inr,inted on a drum which is direct -coupled

to the gang tuning condenser shaft. The arrangement permits any

one of eight pre -determined stations to be electrically tuned

in by merely touching the correct push button.

The operation may be more readily understood by ret -

erence to figures

1, 3, and 6.

When the motor is not ener-

gized, the armature is pushed to the rear or slightly out of the

magnetic center by tension of contact spring "C" and the motor

shaft is dis-engaged from the driving gear train.

Pressing in any

one of the eight push buttons will complete the motor circuit

through a station selector contactor disc, assuming that the A.F.C.

and Motor Control is in "Electric" position and that the insulated

segment in the contactor disc is not opposite its contactor.

the motor starts, the armature will be drawn forward, due to

solenoid action, and the pin "F" on the end of its shaft will

engage the arm "G" on the small main pinion gear, thereby

driving the tuning mechanism.

At the same time contact springs

"E" and "D" (S11) will be grounded, causing suppression of audio

amplification and automatic frequency control during the tun-

ing cycle.

The motor will contunue to operate until the in-

sulated segment in the selector disc breaks the motor circuit,

whereupon spring "C" will instantly dis-engage the motor pin

"F" from the arm "G" on the small pinion driving gear and

open contacts "E" and "D".

Pushing another button will

cause the above mentioned cycle to be repeated except that

the motor will be interrupted by the insulated segment on a

corresponding disc.

The discs are individually adjustable on

a drum mechanism, providing a choice of eight "Electric Tuned"

stations. The arrangement of the motor is such that its rotation will continue in the same direction regardless of the number of

"Electric" tuning cycles until the tuning condenser approches

either full out or full in of mesh whereupon lever "H" trips switch

S9 whichr everses the direction of rotation. A throw -out idler gear

link -coupled to

the A. F. C. and Motor control to dis-

connect the motor drive gear train when the control

is thrown

to "Manual" or "Master" position.

Mechanism Adjustments

The electric tuning mechanism is designed to be as simple in

construction and as fool proof in operation as is possible.

order to maintain the accurate results possible with this device

care must be taken in effecting any repairs or adjustments.

Reference should be made to figure 5 and the following:

A -F -C and A -F Amplification Suppression Switches. -

This switch assembly is located on the motor bracket and

closes due to solenoid action of motor armature.

The tension

of the long contact spring "C" is important in bringing about

quick dis-engagement of the motor and in permitting the motor

to pull into mesh with the drive mechanism. Normal adjustment

is attained when the short springs "D" and "E" are aligned

exactly straight with contact points separated approximately

1/32 of an inch and with the spring "C" spaced approximately

7/32 of an inch from spring "D" at the point of contact.

necessary, in order to obtain positive pull -in and quick dis-

engagement of the motor, the tension of spring "C" should be

increased or decreased by bending. This action should be checked

with the front of the chassis raised two inches higher than the

rear.

Contacts of the switch must be kept clean.

Crocus cloth

or a relay burnisher may be used for this purpose.

On all but a few of the first production of 60 cycle motors an

additional adjustment is possible to secure positive pull -in of the

motor. A flat phosphor bronze spring is mounted at the rear of

the motor and exerts a pressure (which may be varied by bending)

on the end of the motor shaft.

A relay bending tool equivalent to the Automatic Electric

Company, Chicago, Illionis, tool No. 7066, will be found handy

in bending the fingers of the switch for proper adjustment.

This

tension adjustment may have to be changed to secure proper

operation on low line voltages; the lower the voltage the less

should be the tension of the switch finger against the rotor shaft.

Motor Reversing Switch.-It is necessary to automatically

stop and reverse the drive motor before the tuning condenser

reaches the end of its travel. Approximately 175 degrees of

sweep it required, and the reversal must take place above 1,700

kc and below 540 kc but not too near the limits of the scale.

The coupling between the station selector drum and the tuning condenser shaft should be attached so that the reversing switch

trip lever "H" is exactly vertical when the condenser is full -out

of mesh. There should be 1/32 of an inch clearance between

the end of the condenser shaft and the selector drum shaft.

While the trip lever is in this position the reversing switch bracket

should be adjusted by means of its elongated mounting holes

until the switch pin "I" just lightly touches trip lever "H."

Main Pinion Gear.-Clearance between the small high-

speed pinion gear "E" and the intermediate gear "K" determines the amount of mechanical noise produced.

Correct

adjustment

will give approximately 1/32 of an inch move-

ment of back lash at the end of pinion arm "G" when gear

"K" is held stationary.

Arm "G" must also be adjusted for

correct mesh with motor shaft drive pin "F".

With the motor

shaft completely forward and pinion "E" tight against its front

bearing, the pinion mounting stud "J" should be adjusted so

that pin "F" meshes its full thickness with the rotating arm

"G."

An increase of this mesh will increase over travel on

tuning while a decrease of mesh will decrease the over travel.

The elongated hole in the front bracket allows sufficient move-

ment of the mounting stud "J" to permit above mentioned

gear mesh adjustment.

A.F.C. and Motor Control.-(1) Link and lever adjustment.

By loosening the set screws holding the link lever on the switch

shaft, an adjustment can be obtained so that the throwout gear

(M) has at least 1/16" clearance with respect to intermediate

gear (L) when the control is in either the Manual or Master

position.

(2)

Throw -out Gear Adjustment-To obtain smooth opera-

tion on "Electric"

or "Remote" positions

is important

that the proper clearance is maintained between the throw -out

gear "M" and the intermediate gear "L."

With the control

thrown to "Remote" position, adjust the mesh between these

gears by means of the eccentric screw "O" and lock nut "P"

on the throw -out gear bracket "MM" until there is approximat-

ely 1/64 of an inch backlash of gear "L" when gear "M" is held

stationary.

If there is a tendency for the throw -out gear "M" to come

out of mesh in either direction of rotation, this may be corrected

by increasing the tension on spring "N" or replacing this spring or by relieving any binding of the lever to which the throw -out

gear is attached.

Binding of this lever may occur at the bearing

on the tuning shaft assembly.

The bearing of the lever should

be carefully washed out with Carbona of equivalent, and re -oiled

plentifully.

Work the lever back and forth while cleaning and

oiling so that any foreign particles will be removed.

Replacing Gear Train.-It should be replaced by sliding

anti -backlash gear "R" on condenser shaft apart so that compres-

sion amounting to one tooth on the gear is obtained in the springs.

Adjust mesh of gear "R" with pinion gear "U" on vernier shaft

before tightening screws "S" so that smooth tuning is obtained

throughout the range.

Motor Alignment.-The motor shaft must be exactly

aligned with the axis of the pinion gear with which it engages.

This may be adjusted by loosening the mounting screws "V"

the motor and aligning shaft by sight.

Correct alignment may

be tested by slowly rotating motor and observing the

relation

between the pin "F" of the motor shaft and the arm "G" on

the

pinion. The relation of the two should remain the same through-

out the revolution.

Additional movement for adjustment may

be obtained by the motor bracket screws "W" if necessary.

ECCENTRIC

ADJUSTING

SCREW

MIS. STUD

FOR

SPRING M

BACKLASH WITH

6EAR-I STATIONARY

GEAR10

INTERMEDIATE

GE AR'2

MOTOR SHAFT

MHIN PINION GENR'E' AND

ENGAGING PIN

HAM'C

MAIN

PINION

GEAR E

NTERMEDIATE

GERR . 3

DRIVE GEAR

ANO SET SCREWS

REAR VIEW

,,SPRING 'N

LINK

LINK HNC, LEVER RSSEMBLY

FRONT VIEW

MOTOR

SHAFT

FULL FOWRRD

I ,,

DRIVE

GEAR -ARM

GEAR

STUD ADJUSTING

NUTS

i;jI

INTERMEDIATE

j »ERR

ANT2I-BACKLASH

SCISSORS GEAR

Ill

ON TUNING CONO.

-I

SHAFT

-I,1 I-

III

TUNING CONDENSER

VERNIER DRIVE

iII SHAFT AND PINION

EAR

INTERMEDIATE

GERRE

C SLOT IN

CHASSIS APRON

DRIVE GEARARM

MOUNTING STUD

SIDE VIEW

LEVER ADJUSTMENT

SCREWS

"R -R" DRIVE GERR TRRIN RSSEMBLY

TYPE 2

RIVETED

CONTACTS

CONTACT

STRIP RDJ.

NUTS

CONTACT

RDJ. SCREWS

CONTACT ASSEMBLIES (BOTTOM VIEW)

TYPE 1

ADJUSTABLE

CONTACTS

SELECTOR ADJ

REY

ADJUST CONTACTS

'TO STRAIGHT EDGE

STATION SELECTOR

DRUM D1515

INSULATED

SEGMENT

CONTACT

ADJUSTING KEY

RECEPTACLE

STATION ADJ.

STRIP

KEY RDJ.

SLOT

MOTOR SPRING

(OA GO- OHO

O+

MOTOR -BRAE HE r

SCREWS 'W"

MOTOR MOUNTING

SCREWS 'V''

STAT ON SELECTOR

DRUM COUPLING

ADJLSTING SCREWS

SELECTOR

DRUM SHAFT

FRAME \--

SELECOR

DRUM BEARING 'Xe

ADJUSTING SCREWS

DRUM BEARING

ADJUSTING PLATE

"B -B" STATION SELECTOR

DRUM BEARING.

REVERSING SWITCH

ADJUSTING NUTS

TX -560926

CONTACT ADJUSTED

__,TO CENTER OF INSULATED

SEGMENT WITH KEY IN SLOT

"D -D" STATION SELECTOR DRUM CONTRCT RDJUSTMENTS

STATION SELECTOR

DRUM REAR SEARING"X"

ADJUSTING SCREWS

POINTER

SLIDER

POINTER

POINTER ADJUSTING

SCREW

LAMPING

STUD

A5531.

SPRING

DRJVE CORD

FINISH

HERE

TART

HERE

TUNING COND

SHAFT

CAUTION- ADJUST INDICATOR DRUM ON

SHAFT SO THAT 'G, SLOT IS CLEAR

OF TUNING CONDENSER

DRIVE SHAFT FOR CONDENSER FULL -

OUT ANO FULL -IN MESH POSITIONS.

TUNING CONDENSER

INDICATOR DRIVE

BRACKET ROTATED COUNTER

CLOCK 'ISE

TILL

THIS SPACE

WITH

L SHAFT

REAR TEN

RET IGHT EN

BRACKET

CONTACT BRACKET

ADJUSTING

ADJUSTING SCREWS

SCRE 5

MOTOR

3 AFT

CONTACT

BRACKET ROTATED

ExTREME CLOCKWISE

ADJUSTMENT OF

SPRING BRACKET

"F -F" A.F.C. AND A.F. AMPLIFICA T

ION

SUPPRESSION SWITCHES.

'Y'

CONTACT ST IP

ADJUSTING NUTS

MOTOR REVERSING SWITCH

PINK' SHOULD 5.ICHTLY TOUCH

TRIP LEVER .1.1 WHEN TUNING

CONDENSER IS FULL OUT OF

MESH.

MOTOR REVERSING

SWITCH

INSULATED SEGMENT

ADJUST HUB RND RRM ON REAR

OF TUNING CONDENSER 50 THIS

LEVER IS VERTICAL WHEN TUN-

ING CONDENSER IS FULL OUT OF

MESH.

"C -C" MOTOR REVERSING SWITCH ADJUSTMENT.

Figure 5- ELECTRIC TUNING MECHANISM

ADJUSTMENTS

4 r t s! It or r' .f nW al Nmi

at 4 IV ' g a

4 4 l 4 9'

A'. 4 4.a n"

Ale

.a re

- r r.- u a,

,- s, ........ --

Station Selector Drum. --(1) Bearing Adjustment --The

selector drum may be removed by unscrewing the two bear-

ing adjusting screws "X" on the front and rear bearings and

sliding shaft out of slots on frame. To replace drum, the reverse

procedure should be followed holding bearing adjusting plates

"Y" firmly against the shaft and tightening adjusting screws.

(2) Contact adjustment-Two types of contact strips are used

They are designated on figure 5, as types 1 and 2, on which the

individual contacts are respectively adjustable and fixed.

type 1, the individual contacts should be adjusted by setting

the end contact springs near the mid -position of their travel

and aligning the remaining springs to them by means of a straight

edge.

Either type of contact strip should be adjusted to the

selector drum by placing two selector adjusting keys in the

station adjustment strip, positions

1 and 8, loosening contact

strip adjusting nuts "Z" and shifting the contact strip until

the end contacts are exactly centered on the respective disc

insulating

segments.

More accurate adjustment may be

made by silhouetting

the

point

of contact with a piece of

white paper held behind the contact. Adjustment

will

facilitated by removing complete assembly rear

of tuning

condenser by unscrewing the three mounting screws.

Contacts

and discs must be kept free of dirt, filings, and other extran-

eous matter.

Arcing at the insulating segments of the selector discs

will produce a bad interference during "Electric" tuning but which

will not be present during "Manual" tuning

The condition will

in most cases be due to an accumulation of metallic dust, or

graphite grease on the discs.

Thorough cleaning of the discs

with a cloth and cleaning fluid, polishing with crocus cloth and

careful re -lubrication will eliminate the trouble.

Lubrication.-The dial pointer slide should be greased

with petrolatum.

This same lubrication should be applied

lightly to all gear faces of the drive mechanism and sparingly

with a cloth to the station selector discs.

Any good house-

hold oil, such as "3 -IN -ONE," is suitable for the motor shaft

bearings. A light grade of engine oil should be used for all gear

bearings,

Medium viscosity engine oil, similar to "PYROIL"

(B), should be applied between the thrust washers on the motor

shaft.

"CASTORDAG," a mixture of graphite and castor oil,

is recommended for use at the selector drum end -bearing slots

and at the bearings of cable pulleys.

Motor slips in and out of Mesh and appears to be

overloaded.

In the foregoing paragraphs are described several adjustments

and conditions, which if abnormal, will result in failure of the

motor to operate properly.

It will also be obvious that any

friction condition that causes the motor to become overloaded

may also result in the motor dropping out of mesh.

Sorne of

these other causes are:

Friction between the large tuning knob and the cabinet

or the inner knob.

The slider of the dial pointer may be hitting a burr on its

guide channel.

Condenser rotor contact springs may be too tight.

Station Adjustment

Any 8 stations may be controlled by the Buttons.

Cut

labels for the particular station desired and insert

the labels

in the Buttons with the small celluloid "windows" in front.

Turn the power on ánd proceed to set up the "electric" tuning

as follows:

Set Range Selector to "Broadcast."

Turn A.F.C. and Motor control to Button.

Turn Fidelity

control

counter -clockwise.

Press push button No. 1 and wait until station pointer

comes to rest.

Turn the A.F.C. and Motor control to "Manual."

Remove adjusting key from receptacle on top of station

selector drum mechanism.

Insert key in position marked, "1" in station adjust-

ment strip and push the key all the way down to properly

fit in slot in disc.

Tune the receiver very carefully by means of the manual

tuning knob and the "Magic Eye," to station chosen

for No. 1.

Remove key.

10.

Turn the A.F.C. and Motor control to "Button."

Button No.

is now properly set for "Electric" tuning

Proceed similarly for the other seven push buttons, matching

each station on the dial with the same number on the station

adjustment strip.

Repeat the above steps but place the key

respectively in positions 2, 3, 4, etc., and in each case tune to

the proper station.

Now when you press a button the desired

station will be tuned in electrically.

It is possible to set the mechanism to tune in electrically short

wave stations as well as standard broadcast stations but the same

stability of adjustment cannot be expected as there is no A.F.C.

action on the short wave bands.

Ordinarily, stations separated by 10 kc may be set up and

tuned electrically.

It is not very wise however, to attempt to set

up a weak station for electric tuning on a channel adjacent to a

strong station, unless the station

is of sufficient strength to

actuate the

A.F.C.

If two Buttons ale pressed simultaneously, they will both

lock in position, the motor will never become open circuited at

the selector drum and the motor may continue to operate as

long as the radio is turned on. Pressing any one other Button

will release the locked Buttons and permit normal pushbutton

operation.

If all eight Buttons should be locked in position simultan-

eously (this

is a possible but unlikely occurance), the same

thing will happen but normal operation may be restored by ex-

erting strong pressure on Button No. 8.

Armchair Control

When a S No. H-38205 Remote Control is attached to the re -

ceiver as shown in Figure 6, it duplicates the action of the push-

buttons on the front panel when the A.F.C. and Motor Control

is turned to the "remote" position. A S.P.S.T. switch which is

Reference to Figure 6 will show that buttons No. 4 and No. s

on the arm chair control are marked with an asterisk.

If due

to experimenting on part of the owner, all eight buttons on the

control are simultaneously pressed in position, the condenser

drive motor will operate back and forth continuously as long as

the radio operating switch is on and the A.F.C. and Motor con-

trol is in the "remote" position, unless either button No. 4 o:

button No. 5 is pressed firmly, allowing of all the other buttons

to release.

mounted on the Remote Control permits the operator to open

circuit the reproducer voice coil without walking over to the

radio receiver.

Extra lengths of control cable may be used if it

is desired

to have the Remote Control at a greater distance.

This should

not be done, however, where, the power line voltage is low as the

added voltage drop in the cable circuit will reduce the power of

the drive motor and prevent correct operation.

+ 26 hidden pages

Westinghouse W-1516 X, 420A, 512A, 512X, 512Y Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual