8
R-15AT
DOOR OPEN MECHANISM
The door is opened by grasping the door handle, refer to
Figure D-1.
When the door handle is grasped, the handle lever is
pulled. And then the upper and lower latch heads are
moved upward by the handle lever, and they are re-
leased from the latch hook. Now the door will open.
Figure D-1. Door Open Mechanism
2ND. INTERLOCK SWITCH SW2 AND PRIMARY
INTERLOCK RELAY CONTROL SWITCH SW1
1. When the oven door is closed, the contacts (COM-NO)
of each switch must be closed.
2. When the oven door is opened, the contacts (COM-
NO) of each switch must be opened.
MONITOR SWITCH SW3
1. When the door is closed, the contacts (COM-NC) must
be opened.
2. When the door is opened, the contacts (COM-NC)
must be closed.
3. If the oven door is opened and the contacts (COM-NO)
of the 2nd. interlock switch SW2 and the relay RY-3 fail
to open, the fuse F10A blows immediately after closing
the contacts (COM-NC) of the monitor switch SW3.
CAUTION: BEFORE REPLACING A BLOWN FUSE F10A
TEST THE 2ND. INTERLOCK SWITCH SW2,
MONITOR SWITCH SW3 AND RELAY RY-3
FOR PROPER OPERATION. (REFER TO
CHAPTER “TEST PROCEDURE”).
FUSE F1 F10A 250V
1. If the wire harness or electrical components are short-
circuited, this fuse blows to prevent an electric shock or
fire hazard.
2. This fuse blows when the 2nd. interlock switch SW2
remain closed with the oven door open and when the
contacts (COM-NC) of monitor switch SW3 closes.
FUNCTION OF IMPORTANT COMPONENTS
HIGH VOLTAGE FUSE F2 0.75A
The high voltage fuse blows when the high voltage rectifier
or the magnetron is shorted.
THERMAL CUT-OUT TC2 145˚C (MAGNETRON)
This thermal cut-out protects the magnetron against over-
heating. If the temperature goes up higher than 145˚C
because the fan motor is interrupted or the ventilation
openings are blocked, the thermal cut-out will open and
line voltages to the high voltage transformer will be cut off
and the operation of the magnetron will be stopped. The
thermal cut-out will not resume.
THERMAL CUT-OUT TC1 125˚C (OVEN)
The thermal cut-out located on the top of the oven cavity
is designed to prevent damage to the oven if the food in the
oven catches fire due to over heating produced by im-
proper setting of the cooking time or failure of control unit.
Under normal operation, the oven thermal cut-out re-
mains closed. However, when abnormally high tempera-
tures are reached within the oven cavity, the oven thermal
cut-out will open at 125˚C causing the oven to shut down.
The thermal cut-out will not resume.
NOISE FILTER
The noise filter assembly prevents radio frequency inter-
ference that might flow back in the power circuit.
ANTENNA MOTOR AM
The antenna motor rotates the stirrer antenna located on
the bottom of the oven cavity, so that the food on the
ceramic shelf is cooked evenly during cooking. The an-
tenna motor may turn in either direction.
COOLING FAN MOTOR FM
The cooling fan motor drives a blade which draws exter-
nal cool air. This cool air is directed through the air vanes
surrounding the magnetron and cools the magnetron.
This air is channelled through the oven cavity to remove
steam and vapors given off from the heating food. It is
then exhausted through the exhausting air vents at the
oven cavity.
Latch Hook
Latch Switch
Lever A
Latch Switch
Lever B
Latch Switch
Lever C
Latch Head
Latch Head
Handle
Lever
Door
Handle
Latch
Lever
SW2: 2nd. Interlock Switch
SW3: Monitor Switch
SW1:
Primary Interlock Relay
Control Switch
