RCA Q22A, Q32 Service Manual

Model Q22A

LOW

TONE

CONTROL

SOFT

OFF

POWER -VOLUME

CONTROL

Location of Controls

Frequency Ranges Standard Broadcast ("A" Band)

Medium Wave ("B" Band)

"31" Meter Spread Band "25" Meter Spread Band "19-13" Meter Spread Band

Intermediate Frequency

Tube Complement

(1) RCA-6SA7

(2) RCA-6SK7

(3) RCA-6SQ7

(4) ACA-6AD7-G

(5) RCA -6F6 -G

(6) RCA-5Y3-GT

Power Output Rating

Undistorted

Maximum

Loudspeaker

Model

Type (Electrodynamic)

V -C Impedance at 400 c.p.s.

Model Q32

19-13

LOUD

TUNING

CONTROL

RANGE

CONTROL

Electrical and Mechanical Specifications

540-1,720 kc (556-174 m)

3.0-9.5 mc (100-31.6 m)

9.5-11.7 mc (31.6-25.6 m)

11.7-15.1 mc (25.6-19.9 m)

15.1-22.5 mc (19.9-13.3 m) 455 kc

1st Detector -Oscillator

2nd Detector, A -F Amplifier, A.V.C.

Phase Inverter, Power Output

I -F Amplifier

Power Output

Rectifier

3 watts

3.5 watts

92517-1

61/2 inches

3.4 ohms

RCA MODELS 022A

& 032

Chassis No. RC -507 -Mfr. No. 274

Service Data

1 9 4 5

RADIO CORPORATION OF

RCA INTERNATIONAL DIVISION

745 FIFTH AVE., NEW YORK 22, N. Y.

Cabinet Dimensions (Inches)

Q22A (Plastic) Q32 (Wood)

Net Weight (pounds)

Shipping Weight (pounds)

Chassis Base Dimensions (inches) Height,

Over-all Chassis Height

Tuning Drive Ratio

Power Supply Ratings

Symbol

Rating A

Rating B

Rating C

Victrola Attachment.- -A jack is provided on the

for connecti9n to a Victrola Attachment.

tachment should be terminated in a Stock No. 3104E1 plug.

When Victrola is not in use its plug should be removed. When

Victrola is

minimum and, if necessary, tune set off frequency from

strong station.

105-125 volts, 117 nominal 105-125 volts, 117 nominal

[105-125 volts, 117 nominal)

1210-250 volts, 234 nominal

(Shipped in 210-250 volt position)

in use the volume control on the radio should be at

Height

105/e

115e

Voltages

Width

151/2

17"i (1

Frequency

The cable from the

AMERICA

Depth

75S

71,1

23'4;

Width,

Depth, 51/4

91/4 inches

(cycles) Watts

50-60 25-60

50-60

rear of chassis

any very

151/2;

25 to

65 65

at-

180

170

160

150

140

130

120

9.5

=11

2.9

550

11111111111, 1,11 u.,,,111117

105

15.1

180

170

11.7

15.2

160

.41,1

110

3.2

600

115

19 METERS

150

17411

9.6

90 METERS

1111 ill 11111111

11.8

120

125

15.3

15.4

140

130

mi.

3.8

1...1

11.9

700

130

15.6

120

Reduced Reproduction of Receiver Dial, and

The corresponding position of the dial indicator for

point on the bottom calibration scale to the same point

sponds to 600 kc on "A" band, etc.

Read instructions under "Alignment Procedure."

Calibration Scale

110

100

4,4

12.1

800

16.0

100

9.8

60 METERS

10.0

5.4

09 METERS

12.5

eM=

1000

17.0

150

16 METERS

13.0

FD=171

10.5

6.6

1200

155

18.0

11.0

7.8

14.0

1400

20.0

15.0

12=1100

200

22.0

13 METERS

12.0

9.5

1100

205

9.7

110

Corresponding 0-180° Calibration Scales

any setting of the calibration scale can be determined by drawing

on the top calibration scale.

For example 150° on the calibration scale

)

19-13

27598

a line from this

corre-

Q22A & Q32

Cathode -Ray Alignment is the preferable method.

for the oscillograph are shown on the Schematic Circuit Diagram.

Output Meter Alignment.-If this method is used, connect the

meter across the voice coil, and turn the receiver volume control to

maximum.

Test-Oscillator.-For.

side of the test -oscillator to the receiver chassis, and keep the

oscillator output as low as possible to avoid a -v -c action.

Calibration Scale on Indicator -Drive -Cord Drum.-The tuning dial

is fastened in the cabinet and cannot be used for reference during

alignment, therefore a calibration scale is attached to the indicator -

drive -cord drum which is mounted on the shaft of the gang con-

denser.

which is calibrated in degrees. The correct setting of the gong in

degrees, for each alignment frequency, is given in the alignment

table.

The "1800" mark on the drum scale must be vertical, and directly

over the center of the gang -condenser shaft when the plates are

fully meshed.

calibration scales, refer to the calibration scale drawing which shows the dial with 0-180° calibration scales drawn at top and

bottom.

bration scale by fastening a piece of wire to the gang -condenser

frame, and bend the wire so that it points to the "180°" mark on

the calibration scale when the plates are fully meshed.

cabinet, attach the dial indicator to the drive cable with indicator

at the 540 kc mark (the

"550"), and gang condenser fully meshed.

spring cliff for attachment to the cable.

ing or checking the spread -band ranges is on actual reception of

short-wave stations of known frequency, by adjusting the magnet-

ite -core oscillator coil for each spread -band so that these stations

come in at the correct points on the dial.

where the noise level is high enough to prevent reception of short-

wave stations, a test -oscillator may be used for alignment, but an

extremely high degree of accuracy is required in the frequency set-

tinas of the test-oscillaor, as a slight error will produce consider-

of the test -oscillator may be checked by one or both of the follow-

ing methods:

final check should be made on actual reception of short-wave sta-

tions of known frequency, and the magnetite -core oscillator

for each band should be retouched so that the stations come in at

the correct points on the dial.

Alignment."

The setting of the gang condenser is read on this scale,

As the first step in r -f alignment, check the position of the drum.

screws, which must be tightened securely when the drum is in the

correct position.

Tn determine the corresponding frequency for any setting of the

Pointer for Calibration Scale.-Improvise a pointer for the cali-

Dial -Indicator Adjustment.-After fastening the

Spread -Band Alignment.-The most satisfactory method of align-

In exceptional cases, when the set is being serviced in a location

Determine the exact dial settings of the test -oscillator (for fre-

quencies at or close to the specified alignment frequencies) by

zero -beating the test -oscillator against short-wave stations of

known frequency.

Use harmonics of the standard -broadcast range of a test -oscil-

lator,

first checking the frequency settings on this range by

means of a crustal -controlled

against standard broadcast stations.

When a test oscillator is employed for spread -band alignment, a

For additional information, refer to booklet "RCA Victor Receiver

all alignment operations, connect the low

The drum is held to the shaft by means of two set

first mark on "A" band to the left of

spread -band dials. The frequency settings

oscillator,

The indicator has a

Alignment Procedure

Connections

chassis in the

or by zero -beating

coil

a -c. NGE SWITCH

0.8

9 . ScivlaC

1500 SC

LIO

9'SMC 11.8

3.5MC L8 C4

coons sop,

BL2'ALCUSE-G-NON. PHON 0 JACK

1.15 BOTTOM

LIE TOP

ADJ. 455 BC

EP SET, AE AVC.

PHASE

LINE VOLTAGE

SW ITCH ON

MODEL. ONLY

OuTPVT

POWER -

CONTROL

POWER

TRANS.

OUTPUT

2204 1104

RECT.

Tv 2

Tube and Trimmer Locations

Connect the

high side of

Steps

the test-osc.

to--

6SK7 I -F

grid in series

with .01 mfd.

6SA7 1st

Det. grid in

series with

.01 mfd.

Ant. lead

5 Repeat steps 3 and 4

in series

with 300

ohms -

Ant. lead

in series

with 200

11 Repeat steps 9 and 10

image to determine that CI4 has been adjusted to the correct peak

by tuning receiver

weaker signal should be received.

core screw is farthest out (counter -clockwise).

mmf.

Use minimum capacity peak if two can be obtained.

** H two peaks can be obtained use the one obtained when the

Tune test-

osc. to-

455 kc

11.8 mc

15.2 mc

9.5 mc

Range

switch

25 M

19-13 M

31 M

1,500 kc

600 kc

to approximately

Turn radio

dial to-

Quiet

Point

near

1800

138.50

170

1560

11.50 C7 (osc.)

260

1500

14.29 mc (29°) where a

*** Peak at minimum capacity if two peaks can be obtained.

Oscillator tracks above signal on all bands.

NOTE:

Adjust the

following

max. peak

output

1.15 and 1.16

2nd I -F

Trans.

1.13 and L14

1st I -F

Trans.

L11 (osc.)CI

(ant.)

C14 (osc.)

1.12 (osc.)

LIO (osc.)

C2 (ant.)

C4 (osc.)

C3 (ant.)

LB (osc.)

(Rock gang)

Check

for

6SA7

1ST. 06 T.-

CGC,

C141

r=BRAIDx =

TO C110

Twl5T

AROUND YEL. LEAD

TAP

L12

173-751.1 -r-'

C4 2)

TOCIO

G- tmis

-7-

CI7

GREEN

11.1444:

-YELLOW

R.F. WIRING DIAGRAM

FRONT

tz,L:Amr,

-71

cL-p51

L9 L

Le TAP

r"7

( BOTTOM

LACK

GRN

BLUE

To CIO (GND)

v7 )

TO ANT.

L2 LB

L4 E E;

SAME

COIL

CAME

COIL

P-92070 Connections and Colors of Loudspeaker and Cable

Dial -Indicator and Drive Mechanism

SPEAKER PLUG

LAKE SOCKET

0- -BLACK

BLACK

YELLOW

GREEN

BLACK

}TO OUTPUT PLATES

BRN-BLK.---TO OUTPUT SCREENS

BROWN -RECTIFIER FILAMENT

M5I

+ 2 hidden pages

RCA Q22A, Q32 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual