Sharp R-200BK User Manual

7
R-200BK
R-200BW
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. LIGHT UP DIAL ON.
Figure O-2. Oven Schematic-Cooking Condition
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR OPEN MECHANISM
The door is opened by pulling the door, refer to the Figure
D-1.
Latch Heads

Latch Hook
Door
Door
Sensing
Switch
Monitor
Switch
Secondary
Interlock
Switch
Figure D-1. Door Open Mechanism
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
blowing the C/T fuse, when the contacts of the primary
interlock relay (RY1) and secondary interlock switch fail to
open when the door is opened.
Functions:
1. When the door is opened, the monitor switch contacts
close (to the ON condition) due to their being normally
closed. At this time the primary interlock relay (RY1) and
secondary interlock switch are in the OFF condition
(contacts open) due to its being normally open contact
switches.
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing
switch and secondary interlock switch contacts close.
3. If the door is opened, and the primary interlock relay
(RY1) and the secondary interlock switch contact fail to
open, the C/T fuse blows simultaneously with closing of
the monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN C/T FUSE,
TEST THE DOOR SENSING SWITCH, PRI-
MARY INTERLOCK RELAY (RY1), SECOND-
ARY INTERLOCK SWITCH AND MONITOR
SWITCH FOR PROPER OPERATION. (RE-
FER TO CHAPTER "TEST PROCEDURE").
NOTE: C/T FUSE AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY
POWER 
TRANSFORMER
RECTIFIER
MAGNETRON
CAPACITOR
0.72µF
C/T FUSE
120V AC
60 Hz
TURN-
TABLE
MOTOR
FAN 
MOTOR
MONITOR 
SWITCH
SECONDARY
INTERLOCK
SWITCH
TTM
OVEN
LAMP
OL
FM
A3
COM.
N.O.
DOOR
SENSING
SWITCH
A1 A3
(RY-1)
CONTROL UNIT
PRIMARY
INTERLOCK
RELAY
MAGNETRON 
THERMAL CUT-OUT

Sharp R-200BK Specifications

General

Brand	Sharp
Model	R-200BK
Category	Microwave Oven
Language	English