Sharp R-6280 - Page 8

R -6280
TIMER OVEN LAMP
Timer switch contacts:
The timer switch contacts are mechanically opened or
closed by turning the timer knob located on the timer
motor shaft.
These contacts cotroi the current path to the oven lamp
and fan motor,etc.
The oven lamp illuminates the interior of the oven so
that food being cooked can be examined visually
through the door window without having to open the
door.
FAN MOTOR
Timer bell:
The bell striker is mechanically driven by the timer
motor and rings once at the end of the cook cycle.
The fan motor drives a blade which draws cooling air
through the back vents.
This cooling air is directed
through the air vanes surrounding the magnetron and
cools the magnetron. This air is channeled through the
oven cavity to remove steam and vapors given off from
the heating foods. It is then exhausted at the back of
the oven cavity.
Timer motor:
When the timer reaches the U
“point of the scale, the
timer contacts opens the circuit to oven lamp and
power transformer etc, and the cook cycle stops.
SERVICING
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is
helpfull to follow the Sequence of Operation in per-
forming 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 in the monitor
switch, cook switch circuit, check the
monitor switch and cook switch before
replacing the monitor fuse.
PROBLEM
POSSIBLE CAUSE TEST PROCEDURE OR
CORRECTION
OFF CONDITION
iiome fuse blows when power Shorted wire in power cord or wire har-
cord is plugged into wall recepta-
Replase cord or check wiring.-
ness.
cle.
Oven fuse blows when power ’
Shorted wire in power cord or wire har-
cord is plugged into wall recepta-
/ Replace power cord or check
ness.
cle.
, and repair harness.
1 Defective monitor switch.
, Procedure F.
Oven lamp does not light with
/ No power from service entrance.
door opened.
/ Check wall outlet.
I
(Timer is at N
” position.)
/ Open wire in power cord or wire harness. Replace same or repair wir- 1
/ ing.
1 Blown fuse.
/
1
; Check for short circuit and
/
l replace fuse.
/
Defective temp. fuse.
/ Procedure G.
j Defective oven lamp.
1
! Replace oven lamp.
Defective upper latch switch.
/ Procedure E.
1
I
/ Open or loose wire connection to the I Check wiwring.
j above components.
6