R-465 (serv.man9). Complete - Sharp Home Appliance Service Manual (repair manual). Page 8

6

CK = Check / RE = Replace

MAGNETRON

HIGH VOLTAGE TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

1ST. INTERLOCK SWITCH

2ND.INTERLOCK RELAY

CONTROL SWITCH

MONITOR SWITCH

MONITOR RESISTOR

THERMAL CUT-OUT 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 key
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 HIGH)

Oven does not seems to be
operating properly when 70%,
50%, 30% or 10% is set. (Oven
operates properly at 100%
power and when the STOP/
CLEAR key is touched the
oven stops.)

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

TEST PROCEDURE

A B C D E

E

E G F H   H I L M N O

 RE CK CK RE CK CKCK CK CK

J K

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 because of a blown fuse F10A in the 1st. interlock switch - relay RY1

- monitor switch - monitor resistor circuit, check the 1st. interlock switch, relay RY1, monitor switch and
monitor resistor before replacing the fuse F10A.