GE DISR473TWW Technician Service Manual

Brand: GE

Model: DISR473TWW

Category: Washer dryers

Type: Technician Service Manual

GE DISR473TWW is an electric clothes dryer with advanced features and a user-friendly design. It offers a generous 8kg capacity, allowing you to dry large loads of laundry at once. With its 240VAC, 50Hz, and 20amps electrical specifications, it ensures efficient and powerful drying performance.

The GE DISR473TWW features a variety of drying cycles to suit different fabric and load types. Its timed drying option allows you to set the drying time manually, while the automatic cycle uses sensors to detect the moisture level and adjust the drying time accordingly, preventing over-drying and damage to your clothes. Additionally, it has a dedicated wrinkle care cycle to help reduce wrinkles and keep your garments looking fresh.

GE Appliances Service Training

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TECHNICIAN

SERVICE MANUAL

Dryer

MODEL:

DISR473TWW

CIWE1001E

FEBRUARY 2000

CAUTION !

DISCONNECT POWER CORD

BEFORE SERVICING THIS APPLIANCE!

RECONNECT ALL GROUNDING DEVICES

IMPORTANT SAFETY NOTICE !

This service information is intended for use by

individuals possessing adequate backgrounds of

electrical, electronic and mechanical experience.

Any attempt to repair this major appliance may

result in personal injury and property damage. The

manufacturer or seller cannot be responsible for

the interpretation of this information nor can it

assume any liability in connection with its use.

THE MANUAL COVERS THE

FOLLOWING MODELS

MODEL# COUNTRY

DISR473TWW AUSTRALIA

N/A BANGLADESH

N/A CHINA

N/A HONG KONG

N/A INDIA

N/A INDONESIA

N/A JAPAN

N/A KOREA

N/A MALAYSIA

N/A PAKISTAN

N/A PHILIPPINES

N/A SINGAPORE

N/A TAIHITI

N/A TAIWAN

N/A THAILAND

N/A VIETNAM

I. SPECIFICATION

Page 4

ITEMS SPECIFICATIONS

Colour WW, AA

Dimensions (Inches) (W x H x D) 27 x 42 x 28¼

Total # of Cycles 7

Electrical 240 VAC, 50 Hz, 20 amps

Timed Dry (Min) 80

Capacity (kg) 8

Heat Selection 4

Page 5

II. THEORY OF OPERATION

2.1 How a Dryer Works

All dryers, whether gas or electric, operate

according to the same principle  they remove

moisture from damp clothes by bringing the

clothes in contact with a flow of heated air.

Mechanically the clothes must tumble to expose

all of their surfaces to heat, and the heated air

must be circulated within the dryer and then

vented.

Switches, timers and thermostats regulate the

air temperature and duration of the drying cycle.

When the start button is activated with the dryer

door closed, the motor is activated. The motor is

connected to the drum by a drive belt. This

drive belt rotates the drum through a pulley

system attached to the motor shaft. The drum

itself is supported by a bearing and slides at the

front.

2.2 Axial Air Flow

Air is pulled into the cabinet from the rear, and

drawn up across the heaters located behind the

drum. This hot air is pulled through the drum

rear, across the clothes load, through the lint

filter and down the trap direct into the blower.

From the blower the air is pushed out the

exhaust system.

In electric dryers, the heat source is not

energized until the drive motor start turning.

Both the timer and thermostats energize coiled

resistance heaters. The temperature selector

switched control the number of heaters

energized.

Page 6

II. THEORY OF OPERATION

2.2 Axial Air-Flow Dryers

Page 7

II. THEORY OF OPERATION

2.2 Air Flow Diagram

Page 8

III. GROUNDING EQUIPMENT

IF THE DRYER IS SUPPLIED WITH A FLEXIBLE POWER CORD

Plug the cordset into its own separate grounded out. Do Not, UNDER ANY CIRCUMSTANCES, CUT OR REMOVE

THE GROUND PRONG FROM THE POWER CORD.

Page 9

IV. DRYER CONSTRUCTION AND SERVICE

Control Panel : Provide access to timer & switches.

Service : Remote four #15 Torx screws from top. Switches & timer are tab interlock. The timer is

not technical serviceable.

Cabinet : 4 x Parts

2 - Side painted panels with knowckouts for side exhaust

L - Shape galvanized steel chassis : Back - Base  Front

BACK with louvers for air entry and Service access panel

BASE with leveling legs and knockout for buttom exhaust

Service : All cabinet parts are hold together by screws.

Top : Upswept, galvanized steel, power painted

Service : Remove two screws in door opening and lift it up

Door : Embedded in front cabinet

Two parts : Front door and inner door hold by screws

Plugs 2 hinges and a latch strike

Service : Just loose hinge screws in key holes

Front : One-piece construction

Outside : Filter snapped in

Inside : Latch

Front seal and felt

Drum slide

Trap duct

Service : Front - Remove the top

Remove screws on the inside right and left of cabinet

Lift it up from the two supports it rest on at the bottom

Note : The drum must be supported by one hand while removing the front.

Disconnect wires from door switch

Front Seal - Clip on trap duct

Front Felt - Clip on door opening flange

Trap Duct - Clip on door opening flange

Drum Slides - The teflon slides are removable

There are two color slides (grey & white) - do not mix

Do not lubricate the slides

Page 10

IV. DRYER CONSTRUCTION AND SERVICE

Drum : 7 x Parts

Belt

One-piece drum (front  Wrapper  Rear)

3 baffles

Diffuser

Shaft

Bearing

Service : Drum Removal  Remove belt from idler pulley

Release idler arm (belt tension system)

Lift up the drum or through port at right

Reach under the drum behind the motor

Pull idler arm at the pulley end down

Hook the idler end on the motor mount bracket

The bracket has a hook that will hold idelr arm and allow to easily place or remove the belt

over the idelr pulley and motor pulley.

Slide the drum out

Baffles  Hold with 3 screws

Diffuser  Secure with 4 x Torx # 15 screws

Shaft bracket  Same screw as the diffuser. Be careful when re-installing the drum that

the bearing and washers are in place.

Motor / Blower : Motor

Motor mount bracket

Blower housing

Blower

Idler spring

Service : Motor, blower, idler swith are all mounted on motor bracket.

Unscrew the two long screws (9 cm) securing the motor bracket to the blower housing and

two 3/8 hex. Screws through the base.

Heater : Heater assembly

Hi limit thermostat at 2:00 oclock

Safety control thermostat

Control thermos

Service : Heater - The heater is not reastringale and must be replaced as a complete part.

Its mounted with 4 screws.

Thermostat - Secure with screw and tab.

Page 11

V. ELECTRIC CLOTHES DRYER CONTROLS (SCHEMATIC)

Page 12

VI. MACHINE FUNCTION

7.1 Drive System

The drum is rotated counterclockwise, as

viewed, from the front, at a speed of 47-50 RPM.

Belt tension is maintained by a idler pulley and

driven by a pulley attached to the rear motor

shaft.

7.1.1 Belt Alignment

Proper alignment of the drive belt must

be maintained to eliminate:

i. Belts Off  Riding off the rear of

the motor pulley.

ii. Broken Belts or Fast Tumble

Speed resulting from the belt

riding forward on the motor pulley,

turning the drum faster, and

ultimately being damaged by the

motor pulley set screws.

If a damaged belt is found, inspect the

motor pulley grooves for smoothness

and remove any belt threads that may

have been wound around the pulley.

After the new belt is installed, check

the belt alignment as follows.

7.1.2 Belt Alignment Check

Remove the rear cabinet access

panel. Rotate the drum by hand

clockwise and then counterclockwise

several revolutions. Observe the

tracking or position of the belt on the

idler pulley. If the belt tracks near

either the front or rear edge of the

idler pulley, bend the idler arm as

shown to center the belt on the idler

pulley.

Note : The belt ridges and pulley

grooves must match.

(Top View)

DRIVE SYSTEM ALIGNMENT

7.1.3 Motor / Blower Removal - All

Models

Remove drum, remove blower

housing screws on cabinet front.

Release rear motor mounting clip and

remove motor / blower assembly for

service.

Page 13

VI. MACHINE FUNCTION

7.2 Timer Cycles

7.2.1 Timed Cycle

When TIMED drying is selected, the

drying time in minutes is set on the timer

dial. The fabric type or temperature is

set with the selector switch. Actuating

the safety start switch starts the dryer

and timer operation begins, as shown in

the simplified circuit below.

If the timer dial is not in an OFF zone,

Switches TB, TC, and TT, TX are closed.

Drying temperature is controlled by the

thermostat system. See Thermostats for

explanation.

7.2.2 Automatic Cycle

When automatic drying is selected, the

timer dial is set in the automatic zone. The

fabric type or temperature is set on the

selector switch. Actuating the safety start

switch starts the dryer.

240V is applied to the heaters, and drying

begins. The timer does not operate at this

time because it is bypassed by the TB, TA

timer switch and the thermostats which are

all closed. The TT, TH timer switch is open

when automatic drying is selected. When

drying temperature is reached, the drum

outlet thermostat opens. This removes the

bypass circuit around the timer, and a new

series circuit is established. The new

circuit is the timer, the 2000 ohm resistor

and the heraters across 240V. The

hearters being less than 10 ohms can be

disregarded, leaving the timer and the

resistor to divide the voltage. The

impedance of each being approximately

the same allows the timer to see 240 volts,

and timer operation begins.

When the dryer cools down to the reset

point of the drum outlet thermostat, the

drum outlet will close, bypassing the timer

and re-establishing the heater circuit. This

alternative action of heat and timer

operation continues until the end of the

cycle when timer switch TB, TA opens,

preventing additional heat (cool down) and

providing continuous timer operation into

the OFF zone. The cool down period is 8-

10 minutes.

Page 14

VII. THERMOSTAT DATA

THERMOSTAT

TEMPERATURE

F TEMPERATURE

OPEN CLOSE OPEN CLOSE

HIGH DRUM OUTLET

135

5 120

557

349

LOW DRUM OUTLET

125

5 115

552

346

THERMO HI-LIMIT

RIGHT

315

10 250

15 157

6 121

SAFETY LEFT / CONTR.

INLET

210

5180

7 99

382

Page 15

VIII. CIRCUIT DIAGRAM

Page 16

XI. NEW MODIFIED SCHEMATIC

Page 17

X. NEW RELOCATION OF BIASED OUTLET THERMOSTATS

THERMOSTAT

TEMPERATURE

F TEMPERATURE

OPEN CLOSE OPEN CLOSE

DRUM OUTLET

135

5 125

557

352

BIASED CONTROL

INLET

210

5180

5 99

3 85

THERMO HI-LIMIT

RIGHT

315

10 250

15 157

6 121

SAFETY LEFT

210

5180

7 99

382

Page 18

XI. GENERAL TROUBLESHOOTING GUIDE

THIS IS GENERAL TROUBLESHOOTING AID AND MAY NOT COVER ALL SYSTEMS ON A PARTICULAR MODEL

* See Schematic for Proper Switch Connections

1. Heater coils resistance is shown on wiring schematic (on reverse side of this sheet). Check for infinite resistance

between any heater terminal and dryer cabinet. Heater failure could result from low air flow caused by improper

sealing, kinded or excessive ducting, or excessive line voltage.

2. Other factors contributing to long dry times, or clothes condition : load size, large bulky items, ambient temp., room

size (if not exhausted outdoor), washer spin speed, washer rinse temperature.

3. Small loads : Less than 3 lbs. If not treated with destaticizer could develop a static charge if overdried and cling to

drum surface (no tumble) causing wrinkles, shrinkage, or melting. Use a fabric softener (washer or dryer) or add 2

large bath towels to act as buffer when drying.

Page 19

XII. SYMPTOM CHECK CHART

SYMPTOM CHECK

Motor does not operate

Fuse open in power supply lines.

Start switch (backsplash) defective.

Door switch inoperative.

Timer contacts (B-C) inoperative.

Overload protector in motor inoperative.

Open circuit in harness.

Motor defective.

Motor start switch defective.

Belt switch

Drum does not rotate

Broken, loose, or worn belt.

Motor pulley loose.

Drum binding. Check exterior of drum for objects or

excessive pressure of felt seal on drum. Spray

drum edge and slides with silicone.

Dryer runs continually

Operating thermostat inoperative.

Timer motor inoperative.

Circuit to heaters open or heaters open.

Open resistor.

Noise and vibration

Motor mounting bolts loose.

Pulley loose.

Blower rubbing against scroll.

Blower vanes broken.

Worn teflon slides.

Worn drum shaft teflon bearing.

Loose article in drum.

Harness rubbing on drum.

Lint build-up on blower or in scroll.

Foreign object between drum and front felt seal.

Cycle completion  Signal inoperative

Timer contacts T  S inoperative.

Page 20

XII. SYMPTOM CHECK CHART

SYMPTOM CHECK

Clothes damp at end of cycle

Dial setting for type of load incorrect.

Lint trap clogged.

External ducting clogged.

For very small loads, add two or three bath towels

as buffers, or set a longer time selection on dial.

Heat switch setting incorrect (Timed-dry models)

4000 ohm load-compensating resistor inoperative

(Auto cycle dryers)

Control thermostat defective.

Clothes excessively wet when put in dryer.

(Timed dry operation) Dryer installed in location

where temperature is too low (under 50

Clothes wet at end of cycle

Heater element burned.

Centrifugal switch in motor inoperative.

Excessive drying time

Clothes excessively wet when put in dryer.

Thermostat iniperative

Lint trap, or external ducting clogged.

Clothes overdry or wrinkled

Incorrect timer setting used.

Operating thermostat inoperative.

One heater coil open.

(Auto cycle operation) Dryer installed in location

where temperature is too low (under 50

Shrinkage

Clothes do not shrink more in a dryer than in line

drying. Clothes do shrink faster. Example : If an

article shrinks all that it is going to in 12 washings

and line dryings, it may reach its full amount of

shrinkage in only 3 or 4 dryer dryings.

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GE DISR473TWW Technician Service Manual

Brand: GE

Model: DISR473TWW

Category: Washer dryers

Type: Technician Service Manual

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GE DISR473TWW Technician Service Manual

GE DISR473TWW Technician Service Manual

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