R380L(W)
6 – 1
R380L(W)
Service Manual
CHAPTER 6.
FUNCTION OF IMPORTANT COMPONENTS
[1] DOOR OPEN MECHANISM
The door is opened by pushing the open button on the control panel,
refer to the Figure D-1.When the open button is pushed, the open but-
ton pushes up the switch lever, and then the switch lever pushes up
the latch head. The latch heads are moved upward and released from
latch hook. Now the door will open.
Figure D-1. Door Open Mechanism
[2] 1ST. LATCH SWITCH AND 2ND. INTER-
LOCK RELAY CONTROL SWITCH
1. When the oven door is closed, the contacts (COM-NO) must be
closed.
2. When the oven door is opened, the contacts (COM-NO) must be
opened.
[3] MONITOR SWITCH
1. When the oven door is closed, the contacts (COM-NC) must be
opened.
2. When the oven door is opened, the contacts (COM-NC) must be
closed.
3. If the oven door is opened and the contacts (COM-NO) of the 1st.
latch switch and 2nd. interlock relay fail too pen, the fuse F10A
blows simultaneously with closing the contacts (COM-NC) of the
monitor switch.
CAUTION: BEFORE REPLACING A BLOWN FUSE F10ATEST THE
1ST. LATCH SWITCH, 2ND.INTERLOCK RELAY, MONI-
TOR SWITCHAND MONITOR RESISTOR FOR PROPER-
OPERATION.
[4] FUSE F10A
1. The fuse F10A blows when the contacts (COM-NO) oft he 1st. latch
switch and 2nd. interlock relay remain closed with the oven door
open and when the monitors witch closes.
2. If the wire harness or electrical components are short-circuited, this
fuse F10A blows to prevent an electric shock or fire hazard.
[5] HIGH VOLTAGE FUSE
The high voltage fuse blows when the high voltage rectifier or the mag-
netron is shorted.
[6] OVEN TEMPERATURE FUSE
The temperature fuse, located on the top of the oven cavity, is
designed to prevent damage to the oven by fire.If the food load is over-
cooked, by either error in cook time or defect in the control unit, the
temperature fuse will open.Under normal operation, the temperature
fuse remains closed. However, when abnormally high temperatures
are reached within the oven cavity, the temperature fuse will open at
150
°
C, causing the oven to shut down.
[7] TURNTABLE MOTOR
The turntable motor drives the turntable roller assembly to rotate the
turntable.
[8] FAN MOTOR
The fan motor drives a blade which draws external cool air.This cool
air is directed through the air vents surrounding the magnetron and
cools the magnetron. This air is channelled through the oven cavity to
remove steam and vapours given off from the heating foods. It is then
exhausted through the exhausting air vents at the oven cavity.
[9] NOISE FILTER
The noise filter prevents the radio frequency interference that might
flow back in the power circuit.
Latch Hook
Monitor Switch
2nd. Interlock
Relay Control
Switch
1st Latch Switch
Latch
Heads
Door
