AX-1100(R)M, AX-1100(SL)M (serv.man18) - Sharp Home Appliance Service Manual (repair manual). Page 17

AX-1110(SL)M

7 – 1

AX1100(R)

1. The door lever is gripped and the door open handle is pulled.

2. The latch head L is lifted up by the door lever.

3. The latch head U is lifted up by the linked latch lever.

4. Now both latch heads are lifted up, so they can be released from

the latch hook.

5. Now the door can be opened.

Figure D-1. Door Open Mechanism

1. When the oven door is closed, the contacts (COM-NO) of the

switch must be closed. And the contacts (COM-NC) must be
opened.

2. When the oven door is opened, the contacts (COM-NO) of the

switch must be opened. And the contacts (COM-NC) must be
closed.

The monitor switch is activated (the contacts opened) by the latch
head U on the door while the door is closed. The switch is intended to
render the oven inoperative by means of blowing the fuse F2 F8A
when the contacts of the monitored interlock switch SW1 fail to open
when the door is opened.

1. When the door is opened, the contacts (COM-NC) of monitor

switch SW2 close. At this time the contacts (COM-NO) of moni-
tored interlock switch SW1 are open.

2. As the door closed, the monitor switch SW2 contacts (COM-NC)

are opened.

The contacts (COM-NO) of monitored interlock switch SW1 and
door sensing switch SW3 are closed (On opening the door, each of
these switches operate inversely.).

3. If the door is opened and the monitored interlock switch SW1 con-

tacts (COM-NO) fail to open, the fuse F2 (F8A) blows immediately
after closing of the monitor switch (COM-NC) contacts.

CAUTION: BEFORE REPLACING A BLOWN FUSE F2 F8A, TEST

THE MONITORED LATCH SWITCH SW1 AND MONITOR
SWITCH SW2 FOR PROPER OPERATION. (REFER TO
CHAPTER “TEST PROCEDURE”).

1. When the oven door is closed, the contacts (COM-NO) of the

switch must be closed.

2. When the oven door is opened, the contacts (COM-NO) of switch

must be opened

The intake damper switch is turned on and off by the air damper cam
which is rotated by the intake damper motor.

The antenna switch is turned on and off by the shaft assembly which is
rotated by the antenna motor.

If the wire harness or electrical components are short-circuited, this
fuse F1 blows to prevent an electric shock of fire hazard.

1. If the wire harness or electrical components are short-circuited, this

fuse blows to prevent an electric shock or fire hazard.

2. The fuse also blows when the monitored interlock switch SW1

remains closed with the oven door open and when the monitor
switch SW2 contact (COM-NC) closes.

3. The fuse also blows when the asymmetric rectifier, H.V. rectifier,

H.V. wire harness, H.V. capacitor, magnetron or secondary winding
of high voltage transformer is shorted.

The asymmetric rectifier is solid state device that prevents current flow
in both directions. And it prevents the temperature rise of the high volt-
age transformer by blowing the fuse F2 F8A when the high voltage
rectifier is shorted.

The rated peak reverse voltage of D1 of the asymmetric rectifier is 6
kV The rated peak reverse voltage of D2 of the asymmetric rectifier is
1.7 kV. D1 and D2 of the asymmetric rectifier or high voltage rectifier
are shorted when the each peak reverse voltage goes beyond the
each rated peak reverse voltage. (The process of the blowing the fuse
F2 F8A.) 

1. The high voltage rectifier is shorted by some fault when microwave

cooking or dual cooking.

2. The peak reverse voltage of D2 of the rectifier goes beyond the

rated peak reverse voltage 1.7 KV in the voltage doubler circuit.

3. D2 of the rectifier is shorted.

Door lever

Latch angle

Latch head L

Latch lever

Latch head U

D2

D1

ASYMMETRIC
RECTIFIER

HIGH VOLTAGE
RECTIFIER