Maytag 111990" Automatic Dryers User manual

Maytag

111990"

Automatic

Dryers

Service

Manual

16000132

Issued

1990

Revised

2/98

Contents

SECTION 1. ELECTRICAL TEST EQUIPMENT "

1-1

APPLIANCE TEST METER

1-1

CLAMP-ON AMMETER

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

1-3

MOTOR TEST CORD 1-4

VOLTAGE CHECKS 1-5

TEMPERATURE READINGS RANGE (50°F.

300°F.) 1-6

SECTION 2. ELECTRICAL -MECHANICAL TROUBLESHOOTING

2-1

WILL NOT RUN

2-1

WILL NOT DRY '2-2

WILL NOT SHUT OFF

,...............................

2-2

MISCELLANEOUS

,...................................

2-6

MICROPROCESSOR

BOARD

CONTROL MODELS 2-7

DRYER (MICROPROCESSOR BOARD CONTROL)

2-11

FAULT CODE 2-15

SECTION 3. SERVICE PROCEDURES

3-1

ACCESS

CONTROL PANEL COMPONENTS

3-1

CONTROL PANEL ASSEMBLY COMPONENTS

3-1

MICROPROCESSOR

BOARD

CONTROL 3-10

FRONT PANEL AND COMPONENTS 3-13

TUMBLER AND RELATED COMPONENTS 3-17

THERMOSTATS 3-24

BLOWER

3··27

DRIVE MOTOR

AND

IDLER ASSEMBLY

,........................

3-28

HEATING ELEMENT

AND

RELATED COMPONENTS -- ELECTRIC MODELS

3-31

GAS VALVE AND RELATED COMPONENTS 3-34

CABINET AND TOP COVER

3-41

SECTION 4. PRE-INSTALLATION CONSIDERATIONS

4-1

LOCATING DRYER

4-1

EXHAUSTING 4-2

ADJUSTING

MAIN

BURNER 4-6

ELECTRICAL REQUIREMENTS 4-8

ELECTRICAL CONNECTIONS 4-10

A!?DITIONAL INFORMATION 4-12

PERSONAL SAFETY PRECAUTIONS

'.'

. .

4-12

SECTION 5. GENERAL INFORMATION

5-1

HEAT SOURCE

5-1

MODEL CHART 5-2

SCHEMATICS 5-3

ED/GD401 1090 Contents

INTRODUCTION

This service manual is

intended

to assist

you

diagnosing

conditions

which

may

develop. Electrical

component

testing

for

the

most part,

made

with

appliance

test

meter

and consists of checking

for

open

closed circuits. Mechanical checks

are

made

through

sight

and sound,

along

with

the

use of aclamp-on ammeter.

This

manual

designed

for

the

technician

who

familiar

with

the

operation

and

construction

May

tag

products.

Information

contained

this

manual

intended

for

use

qualified

service

technician,

familiar

with

proper

and

safe

procedures

followed

when

repairing

electrical

appliance.

All

tests

and

repairs

should

performed

qualified

service

technician

equipped

with

proper

tools

and

measuring

devices.

All

component

replacements

should

made

qualified

service

technician,

using

only

yeOR

replacement

parts.

Improper

assembly

adjustment

may

occur

service

repair

attempted

persons

other

than

qualified

service

technicians

parts

other

than

yeOR

replacement

parts

are

used.

Improper

assembly

adjustment

can

cause

haz-

ardous

conditions.

There can

risk

injury

electrical

shock

while

performing

services

repairs.

Injury

electrical

shock

can

serious

even

fatal.

The

first

and

most

important

step

any

service

call is

accurately

determine

what

the

complaint

is. This is best

accomplished

questioning

the

customer,

finding

out what

the

prodUct is

isn't

doing

and why

they

feel a

problem

exists.

Section 1covers Electrical Test Equipment. This sections also

covers

general use

the

equipment;

Appliance

Test Meter, Clamp-On

Ammeter

and

Motor

Test

Cord.

Section 2

covers

Electrical-Mechanical

Troubleshooting

and a

list

possible

com-

plaints. Find

the

complaint

which

you

feel best matches that

provided

the

cus-

tomer

and

turn

the

appropriate

page(s). You

will

find a

list

possible

electrical

and mechanical

problems

for

the

complaint,

which

have been listed

there

order

of:

Ease

checking.

Probability.

ED/GD401 1090 INTRODUCTION Iii

Systematically

eliminating

these

possibilities

will

allow

you

find

and

correct

the

problem.

Section 3

covers

Service

Procedures.

This

section

will

provide

information

location

components,

disassembly

and/or

reassembly

procedures,

the

purpos,e

and/or

function

the

part

and

some

instances

specific

checks

made.

Section 4

covers

Pre-Installation

Considerations.

This

provides

information

location

and

exhausting

dryer,

main

burner

adjustment,

electrical

requirements

and

connections.

Section 5

covers

General

Information.

This

section

covers

brief

specifications,

cycle

descriptions

and

schematics.

....

ED/GD401 1090 INTRODUCTION iv

SECTION 1. ELECTRICAL TEST EQUIPMENT

The

equipment

required

service

May

tag

products

depends

largely

upon

the

condition

encountered.

Locating

malfunction

will

often

require

the

use

electrical

testing

equipment

such as:

•

Appliance

Test

Meter

•

Clamp-on

Ammeter

•

Motor

Test

Cord

APPLIANCE TEST METER

Probably

the

easiest

means

testing

electrical

components

~'continuity

testing"

with an

Appliance

Test

Meter.

Continuity

is a

complete

continuous

path

from

one

point

in an

electrical

circuit

another

point.

The

obvious

advantages

being

able

check electrical

components

and

cir-

cuits

without

power

applied

is one

the

features

the

ohmmeter.

Multiple

ranges

allow

accurate

determination

resistances

both

single

components

and

entire

circuit

paths. Resistance is

measured

"ohms".

Appliance

Test

Meter

is a

multi-

purpose

tester

combining

an AC-DC

voltage

tester

with

multi-range

ohmmeter.

APPLIANCE

TEST

METER

SET METER FOR USE

FOLLOWS:

Calibrate

meter

touching

test

probes

together

and

turning

adjusting

dial

until

meter

reads

"0"

the

ohm

scale. Recheck

cali-

bration

whenever

adjusting

dial

for

ohms

settings

changed. (Replace

battery

adjustment

will

not

bring

meter

reading

"0".)

Select

the

scale

most

easily

read

and place test

probes

on respective

terminals.

When checking aswitch,

the

reading

would

normally

either

open

closed. A

reading

70 on

the

R x 10 scale

would

for

example

be 700

ohms

resistance.

ED/GD401 1090 SECTION

ELECTRICAL TEST EQUIPMENT 1-1

~f~

~.,~"]

CAUTION

---------------,

Always

sure

the

power

has been

disconnected

before

making

resist-

ance

measurements.

Failure

will

result

damage

your

meter! Internal

batteries

provide

all

the

power

needed to make resist-

ance checks. They

should

checked at least once a

year

and

replaced as needed.

For

the

most

part, we

will

only

con-

cerned

with

continuity.

there

apath

not? References

are

made

between

"closed"

(continuity)

reading

and an

"open"

(no

continuity)

reading.

One

note,

when

you

get an

"open"

reading,

try

higher

resistance

range

(setting).

very

high

resistance

appea~s

as an

"open"

the

lower

ranges.

For

best

accuracy

alw~ys

"re-zero"

meter

when

changing

ranges

and/or

the

physical

position

the

meter.

Continuity

testing,

to an elec-

tricarcomponent,

the

check

part

for

"open"

"closed"

circuit.

Electrical

components

fall into

two

general

categories.

Loads-

Devices

that

use

consume

electricity:

Examples

ED/GD401 1090

would

include

drive

motor,

heating

elements, lamps,

timer

and

solenoid

coils.

Switches

-Devices

that

control

the

supply

electricity

to the load

loads

in a

circuit.

Examples

include

door

switches,

timer

contacts,

selector

switch and

relay

contacts.

Continuity

test

"load"

devices

will

show

varying

levels

resistance

from

very

low

for

some

transformer

and

motor

windings

very

high

for

some

timer

motors

and

components

on elec-

tronic

control

boards.

Usually

it is

important

know

there

is a

path

for

current

.flow

through

device

(continuity)

than

know

the

exact

resistance (ohms)

the

device.

Continuity

tests

switches

will

show

virtually

no resistance, even

low

values

indicates

burned

dirty

contacts in a

switch.

Continuity

testing

process

elimi-

nating

those

electrical

components

involved

in a

given

function

the

appliance,

until

the

inoperative

part

found.

reviewing

the

list

possible

electrical

problems

under

given

con-

dition,

and

then

performing

appropriate

continuity

checks

the

parts

involved,

you

should

able

to locate

the

elec-

trical

component

which

inoperative.

When checking

components

circuit

paths

for

continuity,

external

wiring

should

disconnected

eliminate

false

readings

through

external

paths.

Isolate what

you

want

test.

The

following

shows

typical

resistance

values

for

some

the

components

found

May

tag

dryers.

Heating

Element

-- 10.23

ohms.

SECTION

ELECTRICAL TEST EQUIPMENT 1-2

Gas

Valve

Disconnect

radiant

sensor

and

igniter

wires.

Measure

across

igniter

wires

igniter

plug

from

valve

get a

resist-

ance

value

-- 425-450

ohms.

Measure

across

sensor

wires

to get a

resistance

-- 450-475

ohms.

Drive

Motor

Red

terminal

Gray

terminal

-- 1.5

ohms.

order

measure

the

individual

windings

the

red

and

gray

wires

will

have

pulled

off

the

start switch.

Run

winding

only

-- 2.25

ohms.

Start Winding

only

-- 3

ohms.

Glow

Bar

Igniter

Because

the

make-up

the

igniter,

the resistance

will

vary

over

rather

wide

range. Values

from

180

ohms

400

ohms

would

typical

with

igniter

room

temperature.

These

values

are

provided

that

you

may

have

idea

the

resistance

that

you

can see in

testing.

These resist-

ances

are

not

meant

be used as the

exact

values

determine

whether

t;omponent

should

be replaced. They

are

provided

that

you

may

have

idea

the

resistance

that

you

can see

testing

components.

EDIGD401 1090

CLAMP-ON

AMMETER

Each

circuit

appliance

has a

"normal"

current

draw

which

is an

indi-

cation

the

performance

that

circuit.

Current

draw

levels, less

than

normal,

give

clues

malfunctions.

The clamp-on

ammeter

measures

these

currents

without

breaking

the

circuit

measuring

the

strength

the

magnetic

field

developed

around

each

conductor.

Current

is read

separating

the

con-

ductors

and

clamping

the

jaws

the

ammeter

around

each

conductor

which

current

be read.

Low

amperage

readings

indicate

problems

such as

damaged

heating

elements,

etc.

High

amperage

readings

indicate

the

unit

being

tested is

operating

under

increased

mechanical

electrical

load.

SECTION

ELECTRICAL TEST EQUIPMENT

1·3

Note:

Overloads

circuit

breaker

fuse can be

traced

the

product

being

tested

the

circuit

breaker

(or

fuse) by

checking

the

product's

current

draw.

the

amperage

reading

is less

than

the

breaker

reading,

the

breaker

fuse

box

is at fault.

USE

AMMETER

DRYER

There

are

two

currents

concern

in an

electric

dryer;

the

heating

element

current

and

the

drive

motor

current.

These

currents

can be meas-

ured

by use

"split

line

cord"

exten-

sion

for

the

dryer

cord

attaching

the

ammeter

the

respective

power

line

wires

the

dryer

terminal

block.

Current

measured

should

amps

the

heating

element

side

the

line,

amps

the

drive

motor

side

the

line

and

amps

the

center

neutral

line.

\".

MOTOR TEST CORD

The

motor

test

cord

may

be used.

electrically

check

operation

the

drive

motor

while

still

installed

the

unit.

Testing

the

motor

this

manner

determines

whether

not

will

run

independently

other

electrical

com-

ponents.

Two test

leads

are

required

check

operation

the

drive

motor.

check

the

motor

for

running,

hook

test

cord

shown.

WHORGY

OVERLOAD'-

PROTECTOR ( "

START

RUN'

I \

,START

:AD

YEL 0RUN

0---

START Q . CENT. SWITCH

~~N

0-----

-q-oBLK

....

,',

...

..........

....

DRIVE MOTOR

Location

terminals

motor

may

vary

from

drawing.

ED/GD401 1090 SECTION

ELECTRICAL TEST EQUIPMENT 1-4

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