Sunbeam T20B, T20A, T20 Service Manual

Sunbeam

Original Service Manual, Radiant Control Toaster

Models T20, T20A, T20B

(Note:

document, it was necessary

layout,

Due to the poor condition

and graphics have been painstakingly and

Compiled by

Dave's Repair Service

©2004 All Rights Reserved

www.DavesRepair.com

the original

of

digitally remaster parts

to

copy

of

faithfully

this vintage

of

it. The original

format,

reproduced.)

Sunbeam

CORPORATION

Service

INSTRUCTIONS FOR SERVICING SUNBEAM RADIANT

CONTROL TOASTER MODELS T20, T20A, & T20B

Bulletin

90-11

No.

May

28,

1953

Toaster

GENERAL

New Sunbeam Radiant Control Toaster is

The

elements in series and _is
previous models and other

or

in

raising

variations

to

method used

Toaster is much

The
bread,

cycle depends entirely upon the amount of heat radiated from the bread being toasted.

When

slices, they should be of uniform freshness to get uniform results.

Attached at the end of this bulletin is a complete

assemblies. These are

the back of the parts list. The tools used for servicing the Toaster are shown at the end

of the bulletin.

toasting one

and lowering the bread,

less sensitive to differences in freshness or

slice, place it into

shown

to be used

toasters

in line voltage than

in their relative positions on the detailed illustration on

on

on ALTERNATING CURRENT ONLY

market in toasting control principle, in

the

the

1275 watt electric appliance with its

a

It

and in the

previous

slot marked

descriptive

.

design of the

moisture

Toasters, because the toasting

"

ONE

SLICE

list of parts and parts

elements.

".

When toasting two

differs from

content

of

the

the

2

WINDOW

END

ELEMENT

CENTER

ELEMENT

GUIDE

WIRE

CLOSED

END

ELEMENT

REFLECTOR

WINDOW

THERMOSTAT

ASSEMBLY

ADJUSTMENT

KNOB

ELEMENT

REFLECTOR

LIFT LEVER

BREAD LIFTER

ASSEMBLY

TRIP

LEVER

BREAD RACK

-

-

3

HOW THE TOASTER OPERATES

Put two slices of bread in the Toaster. The slice in the slot marked "One Slice" will

depress the Trip Lever, causing the Trigger Lever Assembly to close the contact points.

The elements will then heat up, and the expansion of the Center Element wire will allow

the Bread Lifter Assembly to go down slowly under its own weight.

When the bread is

toasted,

the heat radiated from the outer surface of the bread, in the

slot marked "One Slice", will cause the Thermostatic Blade to snap to "off" position,

causing the contact points

open. Then,

to

the elements cool, the wire in the Center

as

Element will contract, and force the Lift Lever Depression Bar down, causing movement of

the Lift Lever Assembly, which forces the Bread Lifter Assembly

toasted

bread.

slowly raise the

to

OPERATING PRINCIPLES

Uniformity of toasting, under varying conditions, such

bread, voltage, and Toaster temperature, is obtained in this Toaster

Radiant Control Thermostat respond

being

toasted.

this temperature,

As the bread surface begins

every instant, bears

at

only the surface temperature of the slice of bread

to

to toast,

close relationship

a

instant. In this particular mechanism this surface temperature is measured

radiated (not conducted) from that surface

Thermostat Assembly is unavoidably affected

of its surroundings,

as to

have

operation

is

absolutely free

no resistance, frictional or otherwise, until

have many times more force available

to

net response

a

is assured

of the effects of friction,

it is

but

because

designed

so

only the heat radiated from the bread surface. Consistent

to

as to

the Thermostat Blade operates with

to do the work than is necessary.

by a

the Radiant Control Thermostat. The

to

temperature rise

properly compensate for this effect

since,

moves freely for

it

bread size, moisture content of

as

having the

by

it will rise in temperature, and

color

to

due to

snap action. Thus, it

a

in its snap motion, it

a

the heating

sufficient distance

the same

at

the heat

by

encounters

up

so

Raising

contraction

or lowering of the

of the Center Element wire. Of course, this movement is very small and is

bread is obtained by making use of the energy

measured in thousandths of an inch,

by a simple linkage which multiplies this movement approximately

movement

it is undesirable to apply stress to

approximately

of

in the lower

1600 F.

range of temperature

The end elements are of unique design for the purpose of increasing the Toaster' s

efficiency. This design possesses much less heat capacity than an element of conventional

type, and consequently permits much faster toasting when the Toaster is cold.

but more

than

(below

this wire while

adequate

1000 F.) is used for

at

carriage movement is obtained

or near

the operating temperature

of expansion and

175

times. Only the

this

purpose since

-

-

4

RULES OF GOOD REPAIR PRACTICES

The success of the repair depends upon the repairman' s ability in following the rules of

good repair practices. These rules can

1. Read the Service Bulletin thoroughly.

2. Know what you are looking for. Never guess. Always investigate the source of

be

summed

as follows:

up

trouble. Ask, if you do not know.

3. Determine troubles

4. Every part, no matter how small, has

smallest detail.

5.

6. Carefully handle smooth, plated, or Bakelite parts

the proper tool. Keep tools in efficient working order.

Use

scratching.

7. Make the repair like

A. DISASSEMBLY

1. Place Toaster onto Tool No.

scratched. Pry off Adjusting Knob,

from Bottom Cover Assembly

Bottom

(7)

Assembly

Screws

from Center Shell

Cover Assembly. Lift Base

with Washers

from Base.

(24)

releasing End Shells

(2)

from Mounting

(8)

.

(1)

Pry Cord Clip

the process of elimination.

by

a job to

would want it, if

you

bottom side

1,

protecting the Shell from being

up,

Key No. (26).

(29)

along

(5)

with Screws

off of mechanism assembly and remove

(25)

Plate

Assembly

from Mounting Plate Assembly

(23)

and Center Shell

perform. Do not overlook the

prevent damaging or

to

were the customer.

you

Remove Screws

from center of Hinge Plate of

(30)

(20).

Separate Plug and

then lift mechanism assembly

(1),

and Washers

(28)

Hex

Cord

(20).

(27)

Nuts

Remove

2.

Set mechanism assembly on

Toaster is a model T20B,

the Spring

Hook over

the End Top Plate

the Bread Lifter Assembly

Lead (21) and Upper Lead Bracket from Thermostat Assembly

Assembly until Reflector clears

Remove Nut (7) and

Lead

(2 1).

Release Guide Wires

Washer

into upright position to remove Hex Nut (7) and Washer

Assembly. Use offset screwdriver to hold stud

Then remove Screws

(7).

Assembly

from mechanism, being careful so that the Guide Wires do not catch in

(11)

(2)

the Element Wires and Rack. The Upper Bus Bar is part

end

remove

(17)

(8)

that Thermostat Assembly

so

Carriage

Counter

and the loop end hooks through the

(3)

Remove Screws

window

in element, then slide it clear of mechanism.

on Mounting Plate Assembly

from Mounting Plate Assembly. Set mechanism back

(9)

lifting End Top Plate

is facing

(12)

Balance Spring (3A) . Four

(13) with Washers

(20)

(8)

when

loosening or tightening Hex Nut

with Guide Wires and Window End

(3)

(8)

(12).

Raise Thermostat

disconnecting Switch

from Center Element

If

up.

turns of

hole in

separating Switch

-

-

5

of the Element Assembly; the Insulator

slides off of the Bus Bar. Now the Window

(4)

End Assembly, End Top Plate, and Guide Wires can be separated. Follow the same

procedure and precautions in removing the other End Top Plate

Element Assembly

but first remove Hex Nut

(6),

and Washer

(7)

(8),

and Closed End

(3)

disconnecting Lower

Bus Bar from Center Element.

3. Release Guide Wires, then remove Screws

Center Top Plate attached, clear of the mechanism. Remove Screws

Lifter Lever Assembly

Yoke

(15).

Remove Screws

and clear of Bread Lifter Assembly

Frame. Now you can pick

Unhook Lift Lever Depression Bar

from mechanism, then remove Screws

(19)

and lift Side Frame

(2),

(17).

Bread Lifter Assembly off of Mounting Plate Assembly.

up

from Lift Lever Assembly, separating Lift Lever

(22)

Lift Center Element Assembly

(2).

(18),

freeing Frame Cross

(2)

from Mounting Plate Assembly

(14)

(10),

releasing

Follow the same procedure for other Side

Depression Bar from the Mounting Plate Assembly.

B. REASSEMBLY

1.

Mounting Plate Assembly

Set

Lift Lever Assembly

Washer

(17)

on

and Hex Nut

(8)

of Mounting Plate Assembly.

top

onto Lift Lever Depression Bar. Connect Switch Lead

(19)

onto Mounting Plate Assembly. Place Bread Lifter Assembly

(7)

(20)

on

place with the Bread Lifter Assembly
with the Bread Lifter Assembly

Assembly, fasten Frame Cross Yoke

set

(15)

of Lift Lever Depression Bar

top

Side Frame Assemblies

Set

in the slots and fasten with Screws

set

(14)

(22)

and

and hook

(21)

(16)

(2).

in slots of Side Frame Assemblies and Lift Lever

with Screws

onto Side Frame Assembly.

(2)

with

with

into

Now

2.

Window End Element Assembly

Set

Install Guide Wires

(9)

and Closed End Element Assembly

(11)

onto Center Top Plate of Center Element Assembly

Center Assembly into place with Upper and Lower Bus Bars of

on respective terminals,

that Adjustment Screw is in center hole of Lift Lever

so

Depression Bar, and fasten Center Top Plate with Screws

Mounting Plate Assembly.

Element. Slide Insulators

Assembly

(12)

Switch Lead Wire

3 to

4 turns of

looped end in

Shell

Center

(1)

Shell

into place, and

(21)

Carriage Counter Balance

hole

onto

mechanism

mechani

to

Replace

(4)

onto Thermostat Assembly with Washers

in Bread Lifter Assembly (17). Fasten End

assembly

sm. After End Shells are fastened, set Center Shell in place,

then holding Toaster by the Base,

Shell are lined up

Push Cord Clamp

and Cord Assembly

with holes

into slot in Mounting Plate Assembly. Push terminal end of Plug

(23)

through hole provided in Base (25) and

(24)

Washer

(8)

and Nut

onto Bus Bar of Window

connect

Upper Lead Bracket of Element Assembly and

Spring

with Screws

push down

(3A)

(2)

into Tool

on Mounting Plate Assembly. Insert

into place.

(6)

(10). Set

the End

(2).

on Bus Bar terminals of Center

(7)

Element. Slide Thermostat

End

(8)

over Top End Plate

. Use Tool No. 2

No.

2 until holes in Center

Element Assemblies

Hook Guide Wires

and Screws

Shells

Screws

(13).

(3).

and

(5)

when

fastening

and tighten.

onto

Hook

Hook the

Center