Description And Function Of Components - Sharp R-203CW Service Manual

SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL
"HIGH"
4. "START" PAD TOUCHED
DOOR OPEN MECHANISM
The door is opened by pulling the door, refer to the Figure
D-1.
Latch Heads
Secondary
Door
Interlock
Switch
Figure D-1. Door Open Mechanism
C/T FUSE
A3
CONTROL UNIT
GRN
120V AC
60 Hz
OL
OVEN
LAMP
SECONDARY
INTERLOCK
SWITCH
Figure O-1. Oven Schematic-Off Condition
C/T FUSE
A3
CONTROL UNIT
GRN
120V AC
60 Hz
OL
OVEN
LAMP
SECONDARY
INTERLOCK
SWITCH
Figure O-2. Oven Schematic-Cooking Condition

DESCRIPTION AND FUNCTION OF COMPONENTS

Latch Hook
Door
Sensing
Switch
Monitor
Switch
MAGNETRON
THERMAL CUT-OUT
COM.
N.O.
(RY-2)
(RY-1)
PRIMARY
INTERLOCK
RELAY
A1
B1 B2
DOOR
SENSING
SWITCH
TTM FM
TURN-
FAN
TABLE
MOTOR
MOTOR
MAGNETRON
THERMAL CUT-OUT
COM.
N.O.
(RY-1) (RY-2)
PRIMARY
INTERLOCK
RELAY
A1
B1 B2
DOOR
SENSING
SWITCH
TTM
FM
TURN-
FAN
TABLE
MOTOR
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
power to all high voltage components. A cook cycle cannot
take place until the door is firmly closed thereby activating
both interlock switches. The primary interlock system con-
sists 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
7
POWER
TRANSFORMER
CAPACITOR
0.86µF
MONITOR
SWITCH
RECTIFIER
POWER
TRANSFORMER
CAPACITOR
0.86µF
MONITOR
SWITCH
RECTIFIER
R-203CW
MAGNETRON
MAGNETRON