R-555. R555 - Sharp Home Appliance Service Manual (repair manual). Page 8

6

MAGNETRON

HIGH VOLTAGE TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

MONITORED LATCH SWITCH

2ND. INTERLOCK RELAY CONTROL

 SWITCH

MONITOR SWITCH

THERMAL CUT-OUT 95˚C /125˚C

FAN MOTOR

TURNTABLE MOTOR

FUSE F10A

TOUCH CONTROL PANEL

KEY UNIT

RELAY (RY-1, RY-2)

FOIL PATERN ON P.W.B.

POWER SUPPLY CORD

SHORTED WIRE HARNESS

OPENED WIRE HARNESS

OVEN LAMP

WALL OUTLET

MISADJUSTMENT SWITCH

HOME FUSE OR BREAKER

BLOCKED COOLING FAN

BLOCKED VENTILATION

NOISE FILTER

HIGH VOLTAGE FUSE

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

FUSE F10A blows when power
supply cord is plugged into wall
outlet.

Display does not show any-
thing when power supply cord
is plugged into wall outlet.

Display  does not operate prop-
erly when STOP/CLEAR pad
is touched.

Oven lamp does not light at
door opened. (Display ap-
pears.)

Oven does not start when the
START key is touched.  (Dis-
play appears)

Oven lamp does not light (Dis-
play appears.)

Fan motor does not operate.
(Display appears.)

Turntable motor assembly
does not operate. (Display ap-
pears.)

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

Oven seems to be operating
but little or no heat is produced
in oven load. (Microwave power
level is set at 100P)

Oven does not seems to be
operating properly when 70P,
50P, 30P or 10P  is set. (Oven
operates properly at 100P)

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

TEST PROCEDURE

CK = Check / RE = Replace

A B C D E

E

E F G   G H K L M N

 RECK CK RE CK  CKCK CK CK

I J

CONDITION

PROBLEM

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

ON
CONDITION

OFF
CONDITION

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 be-

cause of a blown fuse F10A in the
monitored latch switch - monitor switch
circuit, check the monitored latch switch
and monitor switch before replacing
the fuse F10A.