Description And Function Of Components; Door Open Mechanism; Monitor Switch - Sharp R-310AK Supplemental Service Manual

R-310AK
R-330AK
R-330AW
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "HIGH"
4. "START" PAD TOUCHED
OUTER CASE
SWITCH
120V AC
60 Hz
OUTER CASE
SWITCH

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 button pushes up
the switch lever, and then the switch lever pushes up the
latch head. The latch heads are moved upward and re-
leased from latch hook. Now the door will open.
Door
Latch
Heads
Figure D-1. Door Open Mechanism
THERMAL
MONITOR THERMAL
CUT-OUT (OVEN)
FUSE CUT-OUT (MG.)
(RY-1)
A3
CONTROL UNIT
TTM
OL
TURN-
OVEN
TABLE
LAMP
MOTOR
SECONDARY
INTERLOCK
SWITCH
Figure O-2. Oven Schematic-Cooking Condition

DESCRIPTION AND FUNCTION OF COMPONENTS

Latch Hook
Door
Sensing
Switch
Monitor
Switch
Secondary
Interlock
Switch
Switch
Lever
This Circuit is only for R-330AK and R-330AW.
These outer case switches will be used from Oct.
1996 production.
COM.
N.O.
(RY-2)
PRIMARY
INTERLOCK
RELAY
B A
DOOR
SENSING
MONITOR
SWITCH
SWITCH
FM
FAN
MOTOR
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The secondary interlock switch is mounted in the lower
position of the latch hook and the door sensing switch in the
primary interlock system is mounted in the upper position of
the latch hook. They are activated by the latch heads on the
door. When the door is opened, the switches interrupt the
circuit to all components. A cook cycle cannot take place
until the door is firmly closed thereby activating both inter-
lock switches. The primary interlock system consists of the
door sensing switch and primary interlock relay located on
the control circuit board.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the
latch head on the door while the door is closed. The switch
is intended to render the oven inoperative, by means of
blowing the monitor fuse, when the contacts of the primary
interlock relay and secondary interlock switch fail to open
when the door is opened.
Functions:
1. When the door is opened, the monitor switch contact
close (to the ON condition) due to their being normally
closed. At this time the primary interlock relay and
8
POWER
TRANSFORMER
CAPACITOR
0.94µF
RECTIFIER
MAGNETRON