RCA Victor 648PTK User manual

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1

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295

Model

648PV

Walnut

or

Mahogany

rcaV

ict0R

PROJECTION

TELEVISION,

AM-FM

RADIO,

COMRINATION

MODEL

648PTK

Chassis

Nos.

KCS

24-1,

KRS

20-1,

KRS

21-1

KRK

1-1,

RK-121A

and

RS-123A

PROJECTION

TELEVISION

AM-FM

RADIO

PHONOGRAPH

COMRINATION

MODEL

848P¥

'

Chassis

No.

KCS

24A-I,

KRS

20-1,

KRS

2IA-I

KRK-iA,

RK-I2IA

and

RS-I23B

Mfr.

No.

274

Service

Data

-

1947

No.

12

-

-

1948

No.

T4

-

RADIO

CORPORATION

Of

AMERICA

RCA

VICTOR

DIVISION

CAMDEN,

N.

J.,

U.

S.

A.

GENERAL

DESCRIPTION

Model

648PTK

is

a

forty-eight

tube

Projection

Television,

AM-FM

Radio,

console

combination.

The

television

receiver

em¬

ploys

four

chassis

with

a

total

of

thirty-five

tubes

and

a

five-

inch

projection

kinescope.

A

Reflective

Optical

System

pro¬

vides

a

15"

x

20"

picture

on

the

screen.

Features

of

the

television

unit

are

full

thirteen

channel

cov¬

erage;

FM

sound

system;

improved

picture

brilliance;

picture

A-G-C;

A-F-C

horizontal

hold;

stabilized

vertical

hold;

two

stages

of

video

amplification;

noise

saturation

circuits;

three-

stage

sync

separator

and

clipper;

four

me

band

width

for

pic¬

ture

channel

and

reduced

hazard

high

voltage

supply.

The

radio

receiver

employs

an

eight-tube

tuner

unit

and

a

four-tube

audio-amplifier,

power-supply

unit.

The

radio

chassis

is

provided

with

a

Phono

input

jack

to

permit

the

use

of

an

external

record

player.

Model

648PV

is

.a

forty-eight

tube

Projection

Television,

AM-FM

Radio,

Phonograpn,

console

combination.

The

television

receiver

employs

four

chassis

with

a

total

of

thirty-five

tubes

and

a

five-inch

projection

kinescope.

A

Reflective

Optical

System

provides

a

15"

x

20"

picture

on

the

screen.

Features

of

the

television

unit

are

full

thirteen

channel

cov¬

erage;

FM

sound

system;

improved

picture

brilliance;

picture

A-G-C;

A-F-C

horizontal

hold;

stabilized

vertical

hold;

two

stages

of

video

amplification;

noise

saturation

circuits;

three-

stage

sync

separator

and

clipper;

four

me

band

width

for

pic¬

ture

channel

and

reduced

hazard

high

voltage

supply.

The

radio

receiver

employs

an

eight-tube

tuner

unit

and

a

four-tube

audio-amplifier,

power-supply

unit.

An

automatic

record

changer

of

the

"slicer”

type

is

em¬

ployed

and

features

a

crystal

pickup

with

the

"Silent

Sap¬

phire”

stylus.

ELECTRICAL

AND

MECHANICAL

SPECIFICATIONS

TELEVISION

R-F

FREQUENCY

RANGES

Television

Picture

Sound

Tel.

Rec.

Channel

Channel

Carrier

Carrier

R-F

Osc.

Number

Freq.

Me.

Freq.

Me.

Freq.

Me.

Freq.

Me.

1.

.44-50.

.45.25.

.49.75.

.71

2

.

.54-60.

.

55.25

.

.59.75.

.81

3.

.60-66.

.61.25.

.65.75.

.87

4..

......66-72.

.67.25.

.71.75

.

.§3

5

.

.76-82.

.......77.25.

.81.75.

.103

6.

.82-88.

.83.25.

.87.75.......

..

.

1

09

7.........

....174-180.

.175.25.

.179.75.......

.201

8.

....180-186.

.181.25.

.185.75..:....

.........307

9

.

....186-192.

.187.25.

.191.75.

..213

10

.

....192-198.

.193.25.

.197.75.

.219

11.

....198-204.

.199.25.

.203.75.

.225

12

.

....204-210.

.205.25.

.209.75.

.231

13

.

....210-216.

.211.25.

.215.75.

.237

TELEVISION

FINE

TUNING

RANGE

Plus

and

minus

approximately

800

kc

on

channel

1,

and

plus

and

minus

approximately

1.9

me

on

channel

13.

PICTURE

SIZE

.....................................15"

x

20"

RADIO

TUNING

RANGE

Broadcast

.....

540-1,600

kc

Short

Wave

.

9.2-18

me

Frequency

Modulation

.

88-108

me

Intermediate

Frequency—AM

.

455

kc

Intermediate

Frequency—FM

.

10.7

me

RECEIVER

ANTENNA

INPUT

IMPEDANCE..300

ohms

balanced

Specifications

continued

on

page

3

296

648PTE.

8

4

SPY

TABLE

OF

CONTENTS

Page

Alignment

Procedure

(Television)

Detailed

.........

22

Table

.........

28

Alignment

Procedure

(Radio)

.

44

Antenna

.............

11

Circuit

Description

(Television)

....

12

Circuit

Description

(Radio)

..

33

Drawings

(Major)

Television

Adjustment

Location

(Alignment)

.

30

Adjustment

Location

(Installation)

.

9

R-F,

I-F

Chassis

Views

.

20

Horizontal

Deflection

Chassis

View

..

21

Chassis

Wiring

Diagrams

.

56

Circuit

Schematic

.59-63

R-F

Unit

Wiring

Diagram

.57-61

Radio

Adjustment

Location

.

45

Chassis

Wiring

Diagram

.46-47

Circuit

Schematic

.48-49

Pag®

General

Description

..

1

Interference

............

jj

Installation

Instructions

....._

§

Operating

Instructions

..........

4

Photographs

Cabinet

.

j

Test

Pattern

.

«

Waveform

.

gg

Precautions

Kinescope

Handling

.

2

Ventilation

.

H

Reflections

...

Replacement

Parts

.

05

Service

Suggestions

..

32

Specifications

(Elec.

&

Mech.)

.

1

Test

Equipment

.

22

Tube

Complement

.

g

Voltage

Chart

(Television)

.

42

Voltage

Chart

(Radio)

.

5

q

Warning

(High

Voltage)

.

2

HIGH

VOLTAGE

WARMING

OPERATION

OF

THIS

RECEIVER

OUTSIDE

THE

CABINET

OR

WITH

THE

COVERS

REMOVED,

INVOLVES

A

SHOCK

HAZARD

FROM

THE

RECEIVER

POWER

SUPPLIES.

WORK

ON

THE

RE¬

CEIVER

SHOULD

NOT

BE

ATTEMPTED

BY

ANYONE

WHO

IS

NOT

THOROUGHLY

FAMILIAH

WITH

THE

PRECAUTIONS

NECESSARY

WHEN

WORKING

ON

HIGH

VOLTAGE

EQUIPMENT.

DO

NOT

OPERATE

THE

TELEVISION

RECEIVER

WITH

THE

HIGH

VOLTAGE

COMPARTMENT

SHIELD

REMOVED.

KINESCOPE

HANDLING

PRECAUTIONS

DO

NOT

OPEN

THE

KINESCOPE

SHIPPING

CARTON,

INSTALL,

REMOVE

OR

HANDLE

THE

KINE¬

SCOPE

IN

ANY

MANNER

UNLESS

SHATTERPROOF

GOGGLES

AND

HEAVY

GLOVES

ARE

WORN.

PEOPLE

NOT

SO

EQUIPPED

SHOULD

BE

KEPT

AWAY

WHILE

HANDLING

KINE¬

SCOPES.

KEEP

THE

KINESCOPE

AWAY

FROM

THE

BODY

WHILE

HANDLING.

The

kinescope

bulb

encloses

a

high

vacuum

and,

due

to

its

large

surface

area,

is

subjected

to

considerable

air

pressure.

For

these

reasons,

kinescopes

must

be

handled

with

more

car©

than

ordinary

receiving

tubes.

Th®

large

end

of

the

kinescope

bulb—particularly

that

part

at

the

rim

of

the

viewing

surface—must

not

be

struck,

scratched

or

subjected

to

more

than

moderate

pressure

at

any

time.

In

installation,

if

the

tube

sticks

or

fails

to

slip

smoothly

into

Its

socket,

or

deflecting

yoke,

investigate

and

remove

th©

cause

of

the

trouble.

Do

not

force

the

tube.

Refer

to

the

receiver

Installation

Instructions

section

for

detailed

Instructions

on

kinescope

installation.

All

RCA

kinescopes

are

shipped

in

special

cartons

and

should

be

left

in

the

cartons

until

ready

for

installation

in

the

receiver..

Keep

the

carton

for

possible

future

use.

297

ELECTRICAL

AMD

MECHANICAL

POWER

SUPPLY

BATING

Television

Operation

.

115

volts,

60

cvcles,

530

watts

Radio

Operation

.

115

volts,

60

cycles,

145

watts

Phonograph

Operation

.

115

volts,

60

cycles,

165

watts

AUDIO

POWER

OUTPUT

RATING

Undistorted

Power

Output

....

iq

watts

Maximum

Power

Output

....."

’

’’

n

watts

.CHASSIS

DESIGNATIONS

648PTK

Television

R-F,

I-F

Chassis

.KCS24-1

Horizontal

Deflection

Chassis

.

KRS20-1

Television

Power

Supply

Chassis

.KRS21-1

Optical

Barrel

.

KRK1-1

Radio

Chassis

.RK121A

Audio

Amplifier

.

RS123A

Record

Player

.

648PV

KCS24A-1

....KRS20-1

KRS21A-1

..

KRK-IA

.

RK121-A

...

RS123B

.

RP176

LOUDSPEAKER

(92567-2)

Type

.

Voice

Coil

Impedance

.

WEIGHT

Chassis

with

Tubes

in

Cabinet

Shipping

Weight

.

12-inch

Electrodynamic

2.2

ohms

at

400

cycles

648PTK

648PV

■

•

295

lbs.

323

lbs.

360

lbs

.

407

lbs.

DIMENSIONS

(inches)

Width

Height

Cabinet

(outside)

.

648PTK.

36

%

471/2

Cabinet

(outside)

.

648PV.

48

39

V

4

Depth

22

%

251/2

TELEVISION

CHASSIS

DATA

PICTURE

I-F

FREQUENCIES

Picture

Carrier

Frequency

.

25.75

me

Adjacent

Channel

Sound

Trap

.

27.25

me

Accompanying

Sound

Traps

.

21.25

me

Adjacent

Channel

Picture

Carrier

Trap

.

19.75

me

SOUND

I-F

FREQUENCIES

Sound

Carrier

Frequency

.

21.25

me

Sound

Discriminator

Band

Width

(between

peaks)

.

350

kc

VIDEO

RESPONSE

.

To

4

me

FOCUS

.

Electrostatic

SWEEP

DEFLECTION

...

Magnetic

SCANNING

.

Interlaced,

525

line

HORIZONTAL

SCANNING

FREQUENCY

.

15,750

cps

VERTICAL

SCANNING

FREQUENCY

.

60

cps

FRAME

FREQUENCY

(Picture

Repetition

Rate)

.

30

cps

NON-OPERATING

CONTROLS

(not

including

r-f

and

i-f

adjust¬

ments)

SPECIFICATIONS

(Continued)

648PTK

,

648PV

P.CA

TUBE

COMPLEMENT

KCS24-1,

KCS24A-1

R-F,

I-F

CHASSIS

Tube

Used

Function

(

1

)

RCA-

6

J

6

.....

R-F

Amplifier

(2)

RCA-

6

J

6

.

R-F

Oscillator

(3)

RCA-

6

J

6

.....

Converter

(4)

RCA-

6

BA

6

.

1

s

t

Sound

I-F

Amplifier

(5;

RCA-

6

BA

6

.

2nd

Sound

I-F

Amplifier

(

6

)

RCA-

6

AU

6

..

3rd

Sound

I-F

Amplifier

(')

RCA-6AL5

...

Sound

Discriminator

(

8

)

RCA-

6

AT

6

...

A-G-C

Amplifier

(9)

RCA-6AL5

.

A-G-C

Diode

and

D-C

Restorer

(

1

0

)

RCA-6AG5

.

1

st

Picture

I-F

Amplifier

ul)

RCA-6AG5

.

2nd

Picture

I-F

Amplifier

(.12)

RCA-6AG5

.

3rd

Picture

I-F

Amplifier

(13)

RCA-6AG5

.

4th

Picture

I-F

Amplifier

(14)

RCA-6AL5

.

Picture

2nd

.Detector

and

A-G-C

Detector

(15)

RCA-

6

AU

6

.

1

s

t

Video

Amplifier

(16)

RCA-

6

V

6

GT

.

2nd

Video

Amplifier

(17)

RCA-6SK7

.

1

st

Sync

Amplifier

(18)

RCA-6SH7

.

2nd

Sync

Amplifier

(19)

RCA-6J5

.

3

rd

Sync

Amplifier

(20)

RCA-6J5

.

Vertical

Sweep

Oscillator

and

Discharge

(21)

RCA-

6

K

6

GT

.

Vertical

Sweep

Output

KRS20-1

HORIZONTAL

DEFLECTION

CHASSIS

Tube

Used

Function

(1)

RCA-

6

H

6

.

Horizontal

Sync

Discriminator

(

2

)

RCA-

6

K

6

GT

.

Horizontal

Sweep

Oscillator

(3)

RCA-6J5

.

Horizontal

Discharge

(4)

RCA-6AC7

.

Horizontal

Sweep

Oscillator

Control

(5)

RCA-

6

BG

6

G

.

Horizontal

Sweep

Output

(2

tubes)

(

6

)

RCA-5V4G

.

Horizontal

Damper

(7)

RCA-6AS7G

.

Horizontal

Damper

(

8

)

RCA-1B3-GT/8016

.

High

Voltage

Rectifier

(3

tubes)

(9)

RCA-5TP4

....

Projection

Kinescope

KRS

21-1

,

KRS

21

A

-1

TELEVISION

POWER

SUPPLY

CHASSIS

Tube

Used

Function

(1)

RCA-5U4G

.

Rectifier

(3

tubes)

Horizontal

Centering

..

Horizontal

Deflection

chassis

adjustment

Vertical

Centering

...

R-F,

I-F

chassis

rear

adjustment

....

R-F,

I-F

chassis

rear

adjustment

Vertical

Linearity

.

R-F,

I-F

chassis

rear

adjustment

Width

....

Horizontal

Deflection

chassis

screwdriver

adjustment

Horizontal

Linearity

....Horizontal

Deflection

chassis

adjustment

Horizontal

Drive

.

Horizontal

Deflection

chassis

adjustment

Horizontal

Oscillator

Frequency

Horizontal

Deflection

chassis

adjustment

Horizontal

Oscillator

Phase

Horizontal

Deflection

chassis

adjustment

Locus

(Electrical)

..

Horizontal

Deflection

chassis

rear

adjustment

Focus

(Mechanical)

.

Optical

Barrel

adjustment

Deflection

Coil

.

Optical

Barrel

adjustment

Video

Peaking

Switch

.

R-F,

I-F

chassis

rear

switch

Horizontal

Optical

Centering

.

Optical

Barrel

adjustment

Lateral

Optical

Centering

...

Optical

Barrel

adjustment

RK121A

RADIO

CHASSIS

Tube

Used

Function

(1)

RCA-

6

BA

6

.....

R-F

Amplifier

\2)

PlCA-

6

BE

6

.

Oscillator

(3)

RCA-

6

BA

6

.

Mixer

(4)

RCA-

6

BA

6

.

1st

I-F

Amplifier

(5)

RCA-

6

AU

6

.

2nd

I-F

and

Phono

Amplifier

(

6

;

RCA-

6

AU

6

.

Driver

(7)

RCA-6AL5

.

Ratio

Detector

(

8

)

RCA-

6

AT

6

.

AM

Detector,

AVC

and

Audio

Amplifier

RS123A,

RS123B

AUDIO

AMPLIFIER

Tube

Used

Function

(1)

RCA-5U4G

.

Recti{ier

(2)

RCA-6J5

.

p

hase

i

nverte

r

(3)

R

0

A-

6

F

6

G

.

Power

Output

(2

tubes)

3

298

648PTI,

848PV

RECEIVER

OPERATING

INSTRUCTIONS

TELEVISION

OPERATION

The

following

adjustments

are

necessary

when

turning

the

receiver

on

lor

the

first

time.

1.

Turn

the

radio

FUNCTION

switch

to

Tel.

2.

Turn

the

receiver

"ON"

and

advance

the

sound

VOL¬

UME

control

to

approximately

mid-position.

3.

Set

the

STATION

SELECTOR

to

the

desired

channel.

4.

Turn

the

PICTURE

control

fully

counter-clockwise.

5.

Turn

the

BRIGHTNESS

control

clockwise,

until

a

glow

ap¬

pears

on

the

scieen,

then

counter-clockwise

until

the

glow

just

disappears.

6.

Turn

the

PICTURE

control

clockwise

until

a

glow

or

pattern

appears

on

the

screen.

7.

Adjust

the

FINE

TUNING

control

for

best

sound

fidelity

and

sound

VOLUME

for

suitable

volume.

8.

Adjust

the

VERTICAL

hold

control

until

the

pattern

stops

vertical

measurement.

9.

Adjust

the

HORIZONTAL

hold

control

until

a

picture

is

obtained

and

centered.

10.

Adjust

the

PICTURE

control

for

suitable

picture

con¬

trast.

11.

After

the

receiver

has

been

on

for

some

time,

it

may

be

necessary

to

readjust

the

FINE

TUNING

control

slightly

for

improved

sound

fidelity.

12.

In

switching

from

one

station

to

another,

it

may

be

necessary

to

repeat

steps

number

7

and

10.

13.

When

the

set

is

turned

on

again

after

an

idle

period,

it

should

not

be

necessary

to

repeat

the

adjustments

if

the

posi¬

tions

of

the

controls

have

not

been

changed.

If

any

adjustment

is

necessary,

step

number

7

is

generally

sufficient.

14.

If

the

position

of

the

controls

have

been

changed,

it

may

be

necessary

to

repeat

steps

number

2

through

10.

RADIO

OPERATION

1.

Turn

the

radio

FUNCTION

switch

to

the

desired

band

(BC,

SW

or

FM).

2.

Tune

in

the

desired

station

with

the

TUNING

control.

PUSH-BUTTON

OPERATION

1.

Turn

the

radio

FUNCTION

switch

to

the

desired

band

(BC,

SW

or

FM).

2.

Push

the

appropriate

push

button

to

receive

the

desired

station.

PHONOGRAPH

OPERATION

1.

Turn

the

radio

FUNCTION

switch

to

the

phono

position.

2.

Slide

the

changer

power

switch

to

"ON.

HORIZONTAL

BRIGHTNESS

STATION

SELECTOR

CHANGER

CONTROL

SWITCH

CHANGER

POWER

SWITCH

299

INSTALLATION

INSTRUCTIONS

648PTK,

648PV

MODEL

648PTK

Access

to

the

front

tubes

in

the

r-f,

i-f

chassis

may

be

had

through

the

front

of

the

cabinet

by

raising

the

door

stop

as

shown

in

Detail

A

of

Figure

2

and

then

sliding

the

right

television

door

all

the''way

back.

When

this

check

is

com¬

pleted,

close

the

door

to

its

normal

position

and

drop

the

door

stop

back

in

place.

MODEL

648PV

A

heat

shield

is

placed

over

the

RSI

2

3.

audio

amplifier

to

pre¬

vent

the

rectifier

tube

from

coming

in

contact

with

the

optical

barrel

dust

shield

when

the

cabinet

is

closed.

Care

should

be

taken

to

see

that

this

shield

is

replaced

after

the

cardboard

shipping

shields

have

been

removed

from

the

RSI23

amplifier.

To

get

at

the

optical

barrel

adjustments,

take

out

three

screws

on

each

side

of

the

front

of

the

speaker

grill

and

remove

the

Remove

the

shipping

material

as

shown

in

Figure

2.

Make

sure

that

all

tubes

are

firmly

seated

in

their

sockets.

Untie

the

canvas

dust

cover

for

the

optical

barrel

and

tie

it

off

to

one

side.

Caution:

Handle

the

corrector

lens

with

care.

This

lens

is

made

of

a

plastic

material,

is

soft

and

can

be

easily

scratched

by

improper

handling

or

even

by

rubbing

with

a

cloth.

Do

not

use

cleaning

fluid

on

the

lens

as

it

may

be

attacked

by

some

of

the

chemicals

used

in

such

solutions.

In

short,

the

lens

should

be

given

the

care

due

any

precision

optical

equipment.

Remove

the

corrector

lens

from

the

top

of

the

optical

barrel

by

loosening

the

three

screws

holding

the

clamp

springs

as

shown

in

Figure

4.

Caution:

Do

not

loosen

the

three

screws

holding

the

corrector

lens

mounting

plate.

Figure

2—Removal

of

Shipping

Material

MODEL

648PTK

Figure

2—Removal

of

Shipping

Material

MODEL

648PV

648PTK,

648PV

INSTALLATION

INSTRUCTIONS

Although

the

high

voltage

filter

capacitors

of

a

new

receiver

are

not

likely

to

be

charged,

it

is

a

good

idea

to

form

the

habit

of

discharging

the

optical

barrel

before

making

any

internal

adjustments.

Take

a

clip

lead,

fasten

the

clip

end

to

the

bar¬

rel

and

discharge

the

unit

by

making

repeated

contacts

to

the

kinescope

holder

shown

in

Figure

3.

Clean

the

back

of

the

screen,

the

front

of

the

45°

mirror

and

the

optical

barrel

spherical

mirror

by

"sweeping"

the

surface

with

a

small

camel's

hair

brush.

Any

dust

on

the

spherical

mirror

should

be

swept

into

the

black

center

portion

where

it

can

be

picked

up

with

a

piece

of

scotch

tape.

Caution:

Do

not

touch

the

silvered

portion

of

the

mirrors.

The

mirrors

are

surface

silvered

and

can

be

damaged

by

contact

with

the

moist

hand.

If

the

screen

or

mirrors

require

cleaning,

a

solu¬

tion

of

"Dreft"

and

water

should

be

employed.

Figure

3—Kinescope

Holder

Place

a

type

202—B—1

test

lamp

in

the

kinescope

holder

and

adjust

the

ball

screws

to

center

the

lamp

in

the

holder.

Connect

the

lamp

cord

into

a

110-volt

power

outlet

and

turn

the

lamp

on.

Replace

the

corrector

lens,

taking

care

that

the

arrow

on

the

edge

of

the

lens

points

to

the

rear

of

the

cabinet.

Rotate

the

lamp

so

as

to

produce

a

picture

on

the

screen

in

the

proper

aspect.

Cover

the

center

hole

in

the

corrector

lens

with

a

piece

of

black

cardboard

in

order

to

prevent

light

from

this

source

from

lowering

the

resolution.

Pull

the

dust

cover

down

around

the

barrel.

Observe

the

raster

on

the

screen

by

use

of

a

mirror

placed

in

front

of

the

set.

A

chrome-plated

photographic

ferrotype

tin

is

excellent

for

this

purpose.

Loosen

the

optical

focus

adjustment

lock

screws

and

adjust

the

optical

focus

adjustment

for

the

best

overall

definition

on

the

screen.

The

optical

system

should

show

at

least

900

line

resolution

over

all

the

screen.

If

the

system

shows

less

definition,

it

will

be

necessary

to

make

the

adjustments

under

"Alignment

of

Optical

Barrel."

ALIGNMENT

OF

OPTICAL

BARREL—With

the

test

lamp

in

place

as

described

above,

turn

-the

optical

focus

adjustment

until

the

vertical

and

horizontal

lines

become

double.

When

the

test

lamp

is

properly

centered,

the

lines

are

parallel.

If

the

lines

are

not

parallel,

the

Horizontal

or

Lateral

optical

cen¬

tering

controls

require

readjustment.

Lateral

Optical

Adjustment—If

the

vertical

lines

are

not

par¬

allel,

loosen

the

lateral

adjustment

set

screws

and

turn

the

lateral

adjustment

until

the

vertical

lines

are

parallel.

Tighten

the

adjustment

set

screws.

Horizontal

Optical

Adjustment—-If

the

horizontal

lines

are

not

parallel,

loosen

the

optical

horizontal

centering

lock

screws

and

turn

the

optical

horizontal

centering

adjustment

until

the

lines

are

parallel.

Tighten

the

adjustment

lock

screws.

Corrector

Lens

Centering

—Turn

the

focus

adjustment

until

a

halo

appears

around

the

dot

in

the

center

of

the

test

lamp.

If

the

halo

is

not

symmetrical

around

the

dot,

loosen

the

three

corrector

lens

lock

screws

and

the

three

corrector

lens

mount¬

ing

clip

screws

and

shift

the

lens

until

the

halo

is

symmetrical.

Tighten

the

lens

centering

lock

screws

with

the

lens

in

this

position.

Check

of

Optical

Barrel

Tilt

—Adjust

the

optical

focus

control

to

and

through

the

focus

range.

The

picture

should

go

through

focus

all

over

at

the

same

time.

This

does

not

mean

that

the

definition

will

be

equal

over

all

the

picture,

but

it

should

be

the

best

definition

obtainable.

If

this

is

not

the

case,

the

op¬

tical

barrel

is

not

in

alignment

with

the

cabinet

and

requires

adjustment

as

outlined

in

the

following

paragraph.

Optical

Barrel

Tilt

Alignment

—Turn

the

optical

focus

adjust¬

ment

counterclockwise

until

the

picture

is

out

of

focus

then

clockwise

until

the

picture

begins

to

come

in

focus.

If

one

side

comes

into

focus

before

the

rest

of

the

picture,

it

indicates

that

that

side

of

the

optical

barrel

should

be

raised.

Loosen

the

lock

nuts

and

turn

the

inner

jack

nuts,

shown

in

Figure

4,

to

raise

that

side

of

the

barrel

and

the

other

jack

nut

down

to

lower

the

other

side

of

the

barrel,

until

both

sides

of

the

pic¬

ture

come

into

focus

at

the

same

time.

If

the

top

of

the

picture

comes

into

focus

first

as

the

optical

focus

adjustment

is

turned

clockwise,

it

indicates

that

the

outer

jack

nut

(nearest

the

focus

controls)

should

be

adjusted

to

lower

the

back

of

the

optical

barrel,

until

top

and

bottom

come

into

focus

at

the

same

time.

When

the

barrel

is

properly

adjusted,

the

entire

picture

will

come

into

best

focus

all

over

at

the

same

time

as

the

locus

control

is

rocked

through

the

focus

point.

At

this

point

the

pattern

should

be

in

the

center

of

the

screen.

When

this

condition

of

align¬

ment

is

obtained,

tighten

the

lock

nuts

being

careful

not

to

disturb

the

adjustments.

If

the

optical

barrel

tilt

adjustments

are

made,

it

will

be

necessary

to

recheck

the

adjustments

under

Horizontal

Optical

Ad¬

justments

and

Lateral

Optical

Adjustments.

Loosen

all

the

kinescope

mounting

wing

screws

equally

and

just

sufficiently

to

per¬

mit

removal

of

the

test

lamp.

Figure

4

—Optical

Barrel

Adjustments

6

INSTALLATION

INSTRUCTIONS

S48PTK,

648PV

KINESCOPE

HANDLING

PRECAUTION—

Do

not

open

the

kine¬

scope

shipping

carton,

install,

remove,

or

handle

the

kinescope

in

any

manner,

unless

shatterproof

goggles

and

heavy

gloves

are

worn.

People

not

so

equipped

should

be

kept

away

while

handling

the

kinescope.

Keep

the

kinescope

away

from

the

body

while

handling.

The

shipping

carton

should

be

kept

for

use

in

case

of

future

moves.

INSTALLATION

OF

KINESCOPE—The

kinescope

second

anode

contact

is

a

recessed

metal

well

in

the

side

of

the

bulb.

A

small

brass

clip

(from

the

carton

containing

the

deflection

yoke

and

front

panel

control

knobs)

must

be

placed

in

the

kine¬

scope

anode

contact

and

the

tube

inserted

in

the

holder

as

shown

in

Figure

3.

The

tube

must

be

installed

so

that

the

socket

key

on

the

base

of

the

tube

is

pointed

towards

the

horizontal

deflection

chassis.

Make

sure

that

the

anode

clip

is

horizontal

so

that

it

cannot

protrude

out

of

the

holder.

Tighten

the

three

ball

screws

equally

to

center

the

tube

in

the

support.

Caution:

Do

not

apply

too

much

pressure

to

tightening

the

ball

screws

as

the

tube

can

be

cracked

by

so

doing.

Wipe

the

corrector

lens

clean

with

a

piece

of

lens

tissue

and

replace

on

the

barrel.

Turn

the

lens

mounting

clips

in

place

and

tighten

the

clip

screws.

Turn

the

deflection

yoke

so

that

the

slotted

end

of

the

bakelite

center

tube

is

up

and

slide

the

yoke

down

over

the

neck

of

the

kinescope.

Connect

the

kinescope

socket

to

the

base

of

the

tube.

Slip

the

yoke

cables

out

through

the

cable

sleeve

in

the

op¬

tical

barrel

dust

cover.

The

three-prong

plug

on

the

un¬

shielded

yoke

cable

should

be

plugged

into

the

television

r-f

i-f

chassis

as

shown

in

Figure

5.

The

two-prong

plug

on

the

shielded

yoke

cable

should

be

plugged

into

the

horizontal

de¬

flection

chassis.

The

shield

braid

extension

from

this

cable

should

be

grounded

to

the

chassis

by

means

of

the

screw

pro¬

vided

for

this

purpo^p.

Caution—Do

not

turn

the

television

receiver

on

with

the

deflec¬

tion

yoke

cables

disconnected.

To

do

so

may

cause

the

de¬

struction

of

the

kinescope

screen.

Reconnect

the

speaker.

Check

all

chassis

interconnecting

cables

to

make

sure

that

all

are

plugged

into

the

proper

sockets

as

shown

in

Figure

5.

It

is

possible

to

insert

the

re¬

ceiver

antenna

and

ground

plug

backwards.

The

ground

wire

should

go

to

the

middle

connector

at

the

radio

chassis

as

shown.

Open

the

kinescope

shipping

carton

and

remove

the

tube.

Handle

this

tube

by

the

neck.

Do

not

cover

the

envelope

of

the

tube

with

fingermarks

as

it

will

produce

leakaqe

paths

between

the

high

voltage

rim

near

the

screen

and

the

grounded

coating

on

the

neck.

If

this

portion

of

the

tube

has

inadvertently

been

handled,

wipe

it

clean

with

a

soft

cloth

moistened

with

''dry'

1

carbon

tetrachloride,

which

is

obtain¬

able

at

most

drug

stores.

Wipe

the

kinescope

screen

clean

of

all

dust

or

finger

marks

with

a

soft

cloth

moist¬

ened

with

the

Drackett

Co.'s

"Windex"

or

similar

cleaning

□

gent.

MODEL

648PV

Figure

5

—Chassis

Interconnecting

Cables

302

INSTALLATION

INSTRUCTIONS

848PTK,

648PV

Remove

the

cover

from

the

horizontal

deflection

chassis

and

take

out

the

strings

holding

the

high

voltage

filter

capacitors

in

the

clips

during

shipment.

Replace

the

chassis

cover.

The

antenna

and

power

connections

should

now

be

made.

Turn

the

power

switch

to

the

''on"

position,

the

function

switch

to

television,

the

picture

control

counterclockwise

and

the

brightness

control

clockwise

until

a

glow

appears

on

the

screen.

Adjust

the

electrical

focus

control

R331

on

the

horizontal

de¬

flection

chassis

until

the

raster

lines

are

in

sharpest

focus

as

seen

when

looking

down

into

the

barrel.

If

necessary,

reduce

the

brilliance

control

setting,

and

readjust

the

focus

control.

Pull

the

dust

cover

down

around

the

optical

barrel.

Adjust

the

optical

focus

adjustment

until

the

raster

lines

are

in

focus

on

the

screen.

Turn

the

deflection

yoke

until

the

raster

lines

are

horizontal

on

the

screen

and

tighten

the

yoke

clamp

in

this

position.

Picture

Adjustments—It

will

now

be

necessary

to

obtain

a

test

pattern

picture

in

order

to

make

further

adjustments.

See

step

3

through

step

10

of

the

receiver

operating

instructions

on

page

4.

CHECK

OF

HORIZONTAL

OSCILLATOR

ALIGNMENT—The

sync

link

(see

Figure

7)

must

be

in

the

normal

position

(2

to

3).

Turn

the

horizontal

hold

control

to

the

extreme

counter¬

clockwise

position.

The

picture

should

remain

in

horizontal

sync.

Momentarily

remove

the

signal

by

turning

the

picture

control

fully

counterclockwise

and

then

returning

it

to

the

op¬

erating

position.

Normally

the

picture

will

pull

into

sync.

Turn

the

horizontal

hold

control

to

the

extreme

clockwise

po¬

sition.

The

picture

should

remain

in

sync.

Momentarily

remove

the

signal.

Again

the.

picture

should

normally

pull

into

sync.

If

the

receiver

passes

the

above

checks

and

the

picture

is

normal

and

stable,

the

horizontal

oscillator

is

properly

aligned.

Sk

f

p

"Alignment

of

Horizontal

Oscillator"

and

proceed

with

HEIGHT

AND

VERTICAL

LINEARITY

ADJUSTMENTS.

ALIGNMENT

OF

HORIZONTAL

OSCILLATOR—If

in

the

above

check

the

receiver

failed

to

hold

sync

with

the

hold

control

at

either

extreme

or

failed

to

pull

into

sync

after

momentary

removals

of

the

signal,

make

the

adjustments

under

"Slight

Retouching

Adjustments."

If,

after

making

these

retouching

adjustments,

the

receiver

fails

to

pass

the

above

checks

or

if

the

horizontal

oscillator

is

completely

out

of

adjustment,

then

make

the

adjustments

under

"Complete

Realignment."

Slight

Retouching

Adjustments—Tune

in

a

Television

Station

and

adjust

the

fine

tuning

control

for

best

sound

quality.

Sync

the

picture

and

adjust

the

picture

control

for

slightly

less

than

normal

contrast.

Turn

the

horizontal

hold

control

to

the

extreme

position

in

which

the

oscillator

fails

to

hold

or

to

pull

in.

Momentarily

remove

the

signal.

Turn

the

T301

fre¬

quency

adjustment

on

the

chassis

rear

apron

until

the

oscil¬

lator

pulls

into

sync.

Check

hold

and

pull-in

for

the

other

extreme

position

of

the

hold

control.

Complete

Realignment—Tune

in

a

Television

Station

and

adjust

the

fine

tuning

contiol

for

best

sound

quality.

With

the

sync

link

in

the

normal

position

(2-3),

turn

the

T301

frequency

adjustment

(on

rear

apron),

until

the

picture

is

syn¬

chronized.

(If

the

picture

is

not

synchronized

vertically,

adjust

the

vertical

hold.)

Adjust

the

picture

control

so

that

the

pic¬

ture

is

somewhat

below

average

contrast

level.

I

urn

the

T301

phase

adjustment

screw

(under

chassis,

see

Fig¬

ure

23)

until

the

blanking

bar,

which

may

appear

in

the

pic¬

ture,

moves

to

the

right

and

off

the

raster.

The

range

of

this

adjustment

is

such

that

it

is

possible

to

hit

an

unstable

condi-

ion

(ripples

in

the

raster).

The

screw

must

be

turned

clock¬

wise

from

the

unstable

position.

The

length

of

stud

beyond

the

bushing

in

its

correct

position

is

usually

about

Vz

inch.

Turn

horizontal

hold

to

extreme

counterclockwise

position.

Turn

T301

frequency

adjustment

clockwise

until

the

picture

falls

out

of

sync.

Then

turn

it

slowly

counterclockwise

to

the

point

where

the

picture

falls

in

sync

again.

Readjust

T301

phase

adjustment

so

that

the

left

side

of

the

picture

is

close

to

the

left

side

of

the

raster,

but

does

not

begin

to

fold

over.

Turn

horizontal

hold

to

extreme

clockwise.

The

right

side

of

the

picture

should

be

close

to

the

right

side

of

the

raster,

but

should

not

begin

to

fold

over.

If

it

does,

readjust

the

phase.

Momentarily

remove

the

signal.

When

the

signal

is

restored,

the

picture

should

fall

in

sync.

If

it

doesn't,

turn

T301

fre¬

quency

adjustment

counterclockwise

until

the

picture

falls

in

sync.

Turn

horizontal

hold

to

extreme

counterclockwise

position.

Re¬

move

the

signal

momentarily.

When

signal

is

restored,

the

picture

should

fall

in

sync.

NOTE:

If

the

picture

does

not

pull

in

sync

after

momentary

removals

of

signal

in

both

extreme

positions

of

horizontal

hold,

the

pull-in

range

may

be

inadequate,

though

not

necessarily.

A

pull-in

through

%

of

the

hold

control

range

may

still

be

sat¬

isfactory.

There

is

a

difference

between

the

pull-in

range

and

hold-in

range

of

frequencies.

Once

in

sync,

the

circuit

will

hold

about

50%

to

100%

more

variation

in

frequency

than

it

can

pull

in.

The

range

of

the

horizontal

hold

control

is

only

ap¬

proximately

equal

to

the

pull-in

range,

considerable

variation

may

be

found

due

to

variations

in

the

cut-off

characteristic

of

the

horizontal

oscillator

control

tubes,

V303.

Excessive

pull-in

is

objectionable

because

the

higher

sensi¬

tivity

of

the

control

circuits

means

also

greater

susceptibility

to

noise,

and

to

the

vertical

sync

and

equalizing

pulses

which

tend

to

cause

a

bend

in

the

upper

part

of

the

raster.

This

effect

is

more

noticeable

when

the

sync

link

is

in

the

1-2

po¬

sition.

Now

that

a

picture

has

been

obtained

we

may

proceed

with

the

picture

adjustments.

Adjust

the

electrical

and

optical

focusing

adjustments

for

maximum

definition

in

the

vertical

wedge

of

the

test

pattern.

HEIGHT

AND

VERTICAL

LINEARITY

ADJUSTMENTS-

•

Adjust

the

height

control

(R149

on

r-f,

i-f

chassis

rear

apron)

until

the

picture

fills

the

screen

vertically.

Adjust

vertical

linearity

(R175

on

rear

apron),

until

the

test

pattern

is

symmetrical

from

top

to

bottom.

Adjustment

of

either

control

will

require

a

re¬

adjustment

of

the

other.

Adjust

vertical

centering

to

align

the

picture

with

the

mask.

In

some

cases

it

may

be

necessary

to

shift

the

position

of

the

kinescope

in

the

holder

(see

Figure

3)

in

order

to

obtain

proper

centering

of

the

picture.

8

INSTALLATION

INSTRUCTIONS

303

VERTICAL

HEIGHT

VERTICAL

LINEARITY

CONTROL

CENTERING

Figure

6

—

R-F,

I-F

Rear

Chassis

Adjustments

WIDTH

AND

HORIZONTAL

LINEARITY

ADJUSTMENTS—Turn

the

horizontal

drive,

R340,

clockwise

as

far

as

possible

without

causing

crowding

of

the

right

of

the

picture.

Adjust

the

hori¬

zontal

linearity

control,

R351,

until

the

test

pattern

is

sym¬

metrical

left

to

right.

A

slight

readjustment

of

the

horizontal

drive

control

may

be

necessary

when

the

linearity

control

is

used.

Adjust

the

width

control,

L302,

until

the

picture

just

fills

the

screen

horizontally.

Adjust

horizontal

centering

to

align

the

picture

with

the

mask.

In

some

cases

it

may

be

necessary

to

shift

the

position

of

the

kinescope

in

the

holder

in

order

to

obtain

proper

centering

of

the

picture.

Do

not

turn

the

horizontal

drive

control

beyond

approximately

/&

of

its

maximum

clockwise

position.

To

do

so

may

cause

the

output

stage

to

oscillate

and

result

in

the

loss

of

horizontal

sync.

Figure

7—Horizontal

Deflection

Chassis

Adjustments

FOCUS—Adjust

the

focus

control

for

maximum

definition

in

the

test

pattern

vertical

"wedge."

Adjust

the

optical

focus

adjustment

for

best

overall

focus

on

the

screen.

Tighten

all

yoke

and

optical

barrel

lock

screws.

Pull

the

dust

cover

down

around

the

top

of

the

optical

barrel

and

tie

it

securely

in

place.

Tie

the

cable

sleeve

tight

around

the

leads.

These

precautions

are

very

important

for

if

dust

is

permitted

to

enter

and

settle

on

the

corrector

lens,

the

optical

efficiency

of

the

system

will

be

greatly

impaired.

CHECK

OF

R-F

OSCILLATOR

ADJUSTMENTS—Tune

in

all

available

television

stations

to

see

if

the

receiver

r'-f

oscillator

is

adjusted

to

the

proper

frequency

on

all

channels.

If

adjust¬

ments

are

required,

these

should

be

made

by

the

method

outlined

in

the

alignment

procedure

on

page

22

•

The

adjust-

848PTK,

648P¥

ments

for

channels

1

through

5

and

7

through

12

are

available

from

the

front

of

the

cabinet

by

removing

the

station

selector

escutcheon

as

shown

in

Figure

8.

Adjustments

for

channels

6

and

13

are

under

the

chassis.

See

Figure

17.

Figure

8

—

R-F

Oscillator

Adjustments

VIDEO

PEAKING

SWITCH—A

video

peaking

switch

is

pro¬

vided

(see

Figure

6)

to

permit

changing

the

video

response.

Normally

the

switch

should

be

left

open.

However,

if

the

pic¬

tures

from

the

majority

of

stations

look

better

with

the

switch,

closed,

the

switch

should

be

closed.

If

transients

are

produced

on

high

contrast

pictures,

the

switch

should

be

left

open.

ANTENNA

TRAP—A

series

resonant

trap

across

the

r-f

ampli¬

fier

grid

circuit

is

provided

to

eliminate

interference

from

an

FM

station

on

the

image

frequency

of

a

television

station

or

interference

on

channel

6

from

a

station

on

channel

10

or

on

channel

5

from

a

station

on

channel

7.

To

adjust

the

trap

in

the

field,

tune

in

the

station

on

which

the

interference

is

observed.

Tune

both

cores

of

the

trap

for

minimum

interference

in

the

picture.

See

Figure

16

for

the

location

of

the

trap.

Keep

both

cores

approximately

the

same

by

visual

inspection.

Then,

turn

one

core

V

2

turn

from

the

original

position

and

repeak

the

second

for

maximum

rejection.

Repeat

this

process

until

the

best

rejection

is

obtained.

RADIO

OPERATION—Turn

the

receiver

function

switch

to

AM

and

FM

positions

and

check

the

radio

for

proper

operation.

PUSH-BUTTON

ADJUSTMENT—To

adjust

the

radio

push

but¬

tons,

set

the

function

switch

to

the

broadcast

band

position,

tune

the

receiver

to

the

desired

station.

Adjust

the

push

but¬

tons

as

instructed

on

page

81

.

Figure

9

—

Push-Button

Adjustments

Select

the

proper

station

call

letter

tab,

moisten

the

back

of

it

and

insert

in

the

appropriate

recess

in

the

push

button

bezel.

Place

the

tab

cellophane

cover

in

the

recess

over

the

tab.

Replace

the

cabinet

back.

Make

sure

the

screws

which

hold

the

back

in

place

are

tight,

otherwise

it

may

rattle

or

buzz

when

the

receiver

is

operating

at

high

volume.

304

648PTK

,

648PV

INSTALLATION

INSTRUCTION

TABLE

The

following

table

is

provided

as

a

check-off

list

for

use

when

installing

the

receivers.

Step

Nc.

Proceed

as

Indicated

1

Remove

front

of

shipping

carton.

■

Slide

cabinet

out

of

carton.

3

Remove

cabinet

back.

■

Take

off

two

nuts

inside

cabinfei

and

remove

cab¬

inet

from

skid.

■

Unpack

yokes,

knobs,

anode

clip,

and

kinescope

holder

ball

head

screws.

6

Remove

shipping

materials.

■

Remove

radio

brackets.

8

Remove

shipping

tapes.

9

Install

control

knobs.

10

Make

sure

all

tubes

are

firmly

seated

in

their

sockets.

11

Remove

optical

barrel

dust

cover.

12

Remove

corrector

lens

and

warning

label.

n

Clean

screen

and

mirrors.

n

Insert

test

lamp

in

kinescope

holder.

15

Replace

corrector

lens,

cover

center

hole.

16

Misadjust

optical

focus.

17

Check

optical,

horizontal

and

lateral

centering.

m

Adjust

centering

if

necessary.

19

Adjust

corrector

lens

centering

if

necessary.

■

Refocus.

H

If

focus

is

uneven,

adjust

optical

barrel

tilt.

22

Repeat

steps

17

through

21

if

necessary

to

obtain

proper

resolution.

23

Remove

corrector

lens.

24

Remove

test

lamp.

25

Unpack

and

clean

kinescope.

H

Insert

kinescope

in

kinescope

holder.

27

Clean

and

replace

corrector

lens.

Step

No.

Proceed

as

Indicated

H

Install

deflection

yoke,

connect

cables

and

kinescope

socket.

B

Check

all

chassis

interconnecting

cables.

Remove

high

voltage

capacitors

shipping

strings.

B

Connect

receiver

to

an

a-c

line

and

antenna.

32

Turn

receiver

on,

function

switch

to

Tel.

33

Tune

in

station

per

Operating

Instructions,

steps

3

through

10.

34

Adjust

electrical

and

optical

focus

control.

35

Check

horizontal

oscillator

for

hold

and

pull-in

with

horizontal

hold

control

at

each

extreme.

36

Align

horizontal

oscillator

(T301)

if

necessary.

37

Rotate

yoke

for

horizontal

pattern,

tighten.

38

Adjust

height

and

vertical

linearity

and

vertical

centering

controls.

39

Adjust

width,

horizontal

drive,

linearity

and

hori¬

zontal

centering

controls.

40

Adjust

focus

control

R331

for

max

definition

of

ver¬

tical

wedge

and

optical

focus

adjustment

for

best

overall

focus.

41

MAKE

SURE

ALL

OPTICAL

ADJUSTMENT

LOCKS

ARE

TIGHT.

B

Replace

optical

barrel

dust

cover.

B

Check

r-f

oscillator

frequency

on

all

channels.

44

Observe

picture

from

all

available

stations.

45

Set

video

peaking

switch

S101

46

Check

radio

for

operation

on

BC,

SW,

and

FM

bands.

47

Set

push

buttons.

48

Adjust

antenna

trap.

U

Insert

station

call

letter

tabs

in

push

button

es¬

cutcheon.

50

Replace

cabinet

back.