Dumont RA-306 User manual

PHOTO

FACT*

Fold

DUMONT

MODELS

RA-3O6,

RA-3O7

BRIGHTNESS

CONTROL

VOLUME

CONTROL

ON-OFF

SWITCH

UHF

TUNING

VHP

TUNING

CHANNEL

SELECTOR

TRADE

NAME

Dumont

DUMONT

MODELWARREN

(Ch.

RA-307')

MANUFACTURER

TYPE

SET

TUBES

POWER

SUPPLY

TUNING

RANGE

MODELS

Warren

RA-306,

RA-307

Bradford

RA-306,

RA-307

Bristol

RA-306,RA-307

Hampton

RA-306,

RA-307

Newport

RA-306,RA-307

Rutland

RA-306,RA-307

Windson

RA-306,

RA-307

Warwick

RA-306,

RA-307

Allen

Dumont

Laboratories,

Inc.,

257

Sixteenth

Ave.,

Patterson,

N.J.

Television

Receiver

Twenty-four

110-120

Volts

AC-60

Cycles

RATING

1.75

Amp.

117

Volts

Channels

thru

VHF,

thru

UHF,Video

45.75MC,

Sound

41.25MC

(Intercarrier)

INDEX

Alignment

Instructions

Drive

Cord

Stringing

(UHF)

Disassembly

Instructions

Horizontal

Sweep

Circuit

Adjustments

Parts

List

and

Descriptions

thru

Photographs

Cabinet-Rear

View

Capacitor

Identification

4,9

Chassis-Top

View

Tuner

7,10

Resistor

Identification

19, 20

Photographs

(Cont)

Trans.,

Inductor

Alignment

Identification

Resistance

Measurements

Servicing

inthe

Field

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

Schematic

(Alternate

Tuner)

Schematic

(TV)

Trouble

Shooting

Aids

12,17

Tube

Failure

Check

Chart

Tube

Placement

Chart

(BottomView)

Tube

Placement

Chart

(TopView)

HOWARD

SAMS

CO.,INC.

•

Indianapolis

Indiana

"Thelisting

ofany

available

replacementpartherein

does

not

constitute

inany

case

recommendation,

warranty

guaranty

Howard

Sams

Co.,Inc.,

to the

quality

and

suitability

such

replacement

part.

The

numbers

these

parts

have

beencompiled

from

informationfurnished

Howard

Sams

Co.,

Inc.,

bythe

manufacturers

ofthe

particulartype

replacementpart

listed."

"Reproduction

use,without

express

permission,

editorial

pictorialcon-

tent,

inany

manner,

prohibited.

patent

liability

assumed

with

respect

the

useofthe

Howard

Sams

Co.,Inc.,Indianapolis

Indiana,

U.S.of

America.Copyrightunder

In-

ternational

CopyrightUnion.

All

rights

reserved

under

Inter-American

Union

(1910)

Howard

W.Sams

Co.,Inc."Printed

inU.S.of

America

DATE

6-54

SET

241

FOLDER

AMP

,-.

THE

COOPERATION

OFTHE

MANUFACTURER

THIS

RECEIVER

MAKES

POSSIBLE

BRING

YOU

THIS

SERVICE

PAGE

PHOTOFACTSTANDARD

NOTATION

SCHEMATIC

©Howard

Samj

Co.,Inc.1954

RII,

LINEARITY

(ClOT)

-p

NOT

MEASURE

DEFLECTION

YOKE

VERT

45—

HORIZ

•

•""

PICTURE

TUBE

(121FP4A

DUMONT

MODELS

RA-3O6,RA-3O7

DUMONT

MODELS

RA-306,

RA-3O7

CHASSIS

BOTTOM

VIEW-CA

PAGE

:APACITOR

IDENTIFICATION

PAGE

TUBE

PLACEMENT

CHART

.MS...

UHF

MIXER

TOP

VIEW

INDICATES

BLANK

LOCATING

KEY

TUBE

SOCKET

VERT

MULT

VERT

OUTPUT

TUBEFAILURECHECK

CHART

f»

The

1'ollowing

chart

lists

tubeswhosefailures

are

mostlikely

produce

the

indicatedsymptoms.

Refer

tube

placementchart

for

location

and

type

tube.

POWER

SUPPLY

FAILURE

raster,

sound

V22,

V23

LOSS

PICTURE

SOUND

pic,

sound,

has

raster

- V3,V4,V5,V6,V7,V8,V13

(VI,

UHF"only)

pic,

sound,

has

snow

V2,V3,

pic,

has

sound,

has

raster

V8,

V24

Has

pic,

sound

V10,

Vll,

V12,

V13

Overloadedpicture

- V9,

V12

SYNC

FAILURE

vert,

sync

V15,

V16

horiz,

sync

V15,

V17,

V18

vert,

horiz.sync

V14,

V15•

SWEEP

FAILURE

raster,

has

sound

V18,V19,V20,V21,V24,

Fuse

(Ml)

vertical

deflection

V15,

V16

Poor

vert,

linearity

foldover

V15,

V16

poor

horiz.

linearity

foldover

V18,

V19,

V20

Narrow

picture

V18,

V19,V20,V21,V22,

V23

Vert,

off

[req.

V15,

V16

Horiz.

off

freq.

V15,

V17,

V18

SET

241

FOLDER

PAGE

ALIGNMENT

INSTRUCTIONS

The

high

voltage

shockhazard

maybe

eliminated

removing

the

6BQ6

(V19)

andthe

6AX4

(V20)

from

their

socket.

VIDEO

ALIGNMENT

Place

the

channel

selector

switchbetween

anytwo

channels.

This

will

disable

the

local

oscillator

and

reduce

the

possibility

erroneousindications.

Wrap

oneend

short

length

wire

around

pin5

(grid)

the

6J6

converter

tube

(V3).

Connect

the

high

side

ofthe

signal

generator

tothe

freeend.

Attenuate

signal

generator

output

maintain

not

morethan

volts

VTVM.

Connect

the

synchronizedsweepvoltage

from

the

sweepgenerator

tothe

horizontal

input

ofthe

oscilloscope

for

horizontaldeflection.

DUMMY

ANTENNA

Direct

SWEEP

GENERATOR

COUPLING

High

side

topin5

(grid)

6J6

(V3)

Low

side

tuner

chassis.

SWEEP

GENERATOR

FREQUENCY

Not

used

43.5MC

(10MC

Swp)

DUMMY

ANTENNA

Direct

SWEEP

GENERATOR

COUPLING

High

side

point

<^>

Low

side

chassis.

SWEEP

GENERATOR

FREQUENCY

Not

used

MARKER

GENERATOR

FREQUENCY

OMC

43.25MC

44.85MC

41.25MC

42.25MC

45.75MC

47.25MC

MARKER

GENERATOR

FREQUENCY

4.5MC

(400lMod)

CHANNEL

Any

SMC

CHANNEL

Any

CONNECT

SCOPE

Use

VTVM.

DCorobeto

point

<^>

Common

chassis.

Vert,

Amp.

thru

detector

(Fig.l)

pin5

(plate)

6CB6

(V4).

Low

side

chassis.

CRAP

ALIGNMENT

CONNECT

SCOPE

Vert.Amp.thru

detector

(Fig.l)

pin11

(cathode)

picture

tube.

Low

side

chassis.

ADJUST

A4,A5,

A6.A7,

ADJUST

REMARKS

Adjust

for

maximumdeflection.

Adjust

for

response

curve

similar

Fig.

Adjust

A4lor

MINIMUM

markeramplitude

41.25MC.

Adjust

A5andA6to

place

the

45.75MC

marker

at70%on

response

curve.

Adjust

A7to

place

42.25MC

marker

at55%

response

curve.

Adjust

A8for

MINIMUM

marker

amplitude

47.25MC.

Remove

short

lenght

wireattached

topin5 of

6J6

(V3).

REMARKS

Adjust

for

MINIMUM

400^

indication

scope

SOUND

ALIGNMENT

USING

SIGNALGENERATOR

AND

OSCILLOSCOPE

Use

frequency

modulated

signal

with

6LH

modulation

and

450KC

sweep.

Use

L2LH

sawtoothvoltage

scope

for

horizontal

deflection.

DUMMY

ANTENNA

Direct

SWEEP

GENERATOR

COUPLING

High

side

point

<^>

Low

side

chassis:

SWEEP

GENERATOR

FREQUENCY

SMC

(450KC

Swp

MARKER

GENERATOR

FREQUENCY

SMC

CHANNEL

Any

CONNECT

SCOPE

Vert.Amp.

point

OT>

. Low

side

chassis.

Vert.Amp.

point

«N

Low

side

chassis.

SOUND

ALIGNMENT

USING

ADJUST

A10.A11

A12

REMARKS

Disconnectstabilizingcapacitor

C5.

Adjust

for

curve

maximumamplitude

and

sym-

metry

similar

Fig.

Reconnect

stabilizing

capacitor

C50

Adjust

that

4.5MC

occurs

center

crossover

lines

asin

Fig.

SLIGHTLY retouch

A-U

for

maximumamplitude

and

straightness

crossover

lines.

SIGNAL

AND

VTVM

Disconnect

test

equipment

and

replace

V19and

V20

their

sockets.

Connectantenna

toVHF

antenna

terminals.

Tune

ina TV

station

and

adjust

for

best

picture

DUMMY

ANTENNA

Not

used

SIGNAL

GENERATOR

COUPLING

Not

used.Tune

ina

signal

SIGNAL

GENERATOR

FREQUENCY

Not

used

CHANNEL

Any

statioi

available

CCNNECT

VTVM

probe

point

<£>

Common

chassis.

probe

point

<&>

Common

chassis.

ADJUST

A10,

All

A12

REMARKS

Adjust

for

maximum

deflection.

Adjust

for

zero

reading.

positive

and

negative

reading

will

obtained

either

side

ofthe

correct

setting.

OSCILLATOR

ALIGNMENT

Place

the

flatsurface

onthe

fine

tuningcontrolshaftdownward.

The

channel

oscillator

adjustment

screws

are

reached

thru

hole

just

tothe

right

and

slightly

above

the

channel

switch

shaft.

The

correctadjustmentscrew

accessible

thru

this

hole

asthe

channelswitch

turned

eachchannel.

Tune

inall

available

stations

inthe

area

and

adjust

the

proper

oscillator

slug

for

clearest

picture

and

best

sound.

RFAND

MIXER

ALIGNMENT

Thisportion

ofthe

receiver

has

beenaligned

atthe

factory

andis

very

stable.

Alignment

this

portion

ofthe

receiver

should

not

required

inthe

field.

UHF

TUNER

ALIGNMENT

Alignment

oftheUHF

tunershould

notbe

attempted

inthe

field.

Ifthe

unit

known

tobeoutof

alignment

orin

need

major

repair,

the

entire

unitshould

returned

tothe

factory.

SCOPE

RCVR.

FIG.

IG.2

FIG.3

FIG.

PAGE

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