DOWNLOAD Sharp R-67STM (serv.man7) Service Manual ↓ Size: 86.58 KB | Pages: 1 in PDF or view online for FREE

R67STM

7 – 1

R67STM

Service Manual

 

When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of
trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the “Test Procedure” section.

IMPORTANT:

If the oven becomes inoperative because of a blown fuse F8A. Check the monitored latch switch monitor switch, relay RY1 and relay RY3 before
replacing the noise filter (fuse F8A).

CONDITION

PROBLEM

A

B

C

E

D

E

F

F

G

Home fuse blows when power cord is
plugged into wall outlet.

"88:88"does not operate in display
when power cord is plugged into wall
outlet.

Display does not operate properly
when STOP/CLEAR key is touched.

Oven lamp does not light, when door
is opened. (Display operates).

Oven does not start when START

key is touched.(Display operates).

Fan motor does not operate (Oven
lamp lights).

Turntable motor assembly does not
operate (Oven lamp lights).

Oven or electrical parts does not stop
when cooking time is "0" or STOP/
CLEAR key is touched.

Display operates properly but all
electrical parts do not operate.

Oven goes into cook cycle but shuts
down before end of cooking cycle.

Oven seems to be operating but little
or no heat is produced in oven load
(Microwave power level is set at
HIGH).

Oven does not seem to be operating
properly

during

variable

cooking

condition(Oven operates properly at
HIGH).

Top heating elelment does not heat.

Bottom heating elelment does not
heat.

(oven seems to be operating).

Fuse F8A blows.

OFF

CONDITION

MICROWAVE

COOKING

CONDITION

GRILL

COOKING

CONDITION

TEST PROCEDURE

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

MAGNETRON

HIGH

VOLTAGE

TRANSFORMER

H.V.

R

ECTIFIER

ASSY

H.V.HARNESS

HIGH

VOLTAGE

CAPACITOR

MONITORED

LATCH

SWITCH

STOP

SWITCH

MONITOR

S

WITCH

THERMAL

C

UT--OUT

(MG)

THERMAL

C

UT-OUT

(OVEN)

FUSE

F8A

(NOISE

FILTER)

FUSE

20A

NOISE

F

ILTER

TURNTABLE

M

OTOR

FAN

M

OTOR

CONTROL

U

NIT

TACT

SWITCH

R

E

L

A

YR

Y

1

,2

,3

,4

,5

TOP

H

EATING

ELEMENT

FOIL

PATTERN

ON

P.W.B.

POWER

S

UPPLY

C

ORD

SHORTED

W

IRE

H

ARNESS

OPENED

WIRE

HARNESS

OVEN

LAMP

BLOCKED

V

ENTILATION

OPENINGS

WRONG

O

PERATION

MIS-ADJUSTMENT

OF

SWITCHES

HOME

FUSE

OR

BREAKER

NO

POWER

A

T

W

ALL

O

UTLET

BLOCKED

C

OOLING

FAN

H

I

J

J

K

BOTTOM

H

EATING

ELEMENT

K

L

M

N O

COOKING

CONDITION

(COMMON)

E