Function Of Important Components - Sharp R-5L16 Service Manual

DOOR OPEN MECHANISM
The door can be opened by pushing the door open button on
the control panel. When the door open button is pushed, the
cook lever is moved upward, operating the latch head. The
latch head is moved upward, and released from the latch
hook. Now, the door can be opened.
LATCH HOOK
LATCH
HEADS
DOOR OPEN BUTTON
Figure D-1. Door Open Mechanism
PRIMARY LATCH SWITCH SW1
1. When the oven door is closed, the contacts (COM-NO)
must be closed and the contacts (COM-NC) must be
opened.
2. When the oven door is opened, the contacts (COM-NO)
must be opened and the contacts (COM-NC) must be
closed.
2ND LATCH SWITCH SW2 AND 3RD LATCH
SWITCH SW3
1. When the oven door is closed, the contacts (COM-NO)
must be closed.
2. When the oven door is opened, (COM-NO) must be
opened.
COOK SWITCH SW4
1. When the oven door is closed and the start button is
pushed, the contacts (COM-NO) must be closed.
2. When the oven door is opened, (COM-NO) must be
opened.
MONITOR SWITCH SW5
1. When the oven door is closed the contacts, (COM-NC)
must be opened and the contacts (COM-NO) must be
closed.
2. When the oven door is opened the contacts, (COM-NC)
must be closed and the contacts (COM-NO) must be
closed.
3. If the oven door is opened ,and the contacts of the relay
RY1 fail to open, the fuse F1 F6.3A blows simultaneously
with closing the contacts (COM-NC) of the monitor switch
SW5

FUNCTION OF IMPORTANT COMPONENTS

2ND. LATCH
SWITCH
PRIMARY
LATCH SWITCH
MONITOR
SWITCH
3RD. LATCH
SWITCH
OPEN LEVER
CAUTION: BEFORE REPLACING A BLOWN FUSE F1
F6.3A TEST THE RELAY RY1, MONITOR
SWITCH SW3 AND MONITOR RESISTOR R1
FOR PROPER OPERATION. (REFER TO
CHAPTER "TEST PROCEDURE.)
MONITOR RESISTOR Rl 4.3
The monitor resistor prevents the fuse F1 F6.3A bursting
when the fuse F1 F6.3A blows due to the operation of the
monitor switch.
TIMER MOTOR (WITH VARI-SWITCH) TM
Timer contacts
•
1. When the timer is at "
TM are opened.
2. When the timer is turned clockwise from "
contacts of the timer TM are closed.
Vari-contacts (COM-NO):
The vari-contacts are operated by the cam roller. If the
variable cooking control is set at MEDIUM HIGH, MEDIUM,
MEDIUM LOW or LOW cooking position, the line voltage is
supplied to the high voltage transformer intermittently within
a 26.4 seconds time base. The following chart shows the
vari-contacts (COM—NO) operation in the various modes.
SETTING
26.4 sec. ON
HIGH
20.4 sec. ON
MEDIUM HIGH
14.5 sec. ON
MEDIUM
8.6 sec. ON
MEDIUM LOW
4.4 sec. ON
LOW
Note: The ON/OFF time ratio does not exactly correspond
to the percentage of microwave power, because
approx. 3 seconds are needed for heating up the
magnetron filament.
FUSE Fl F6.3A 250V
1. If the wire harness or electrical components are short-
circuited, this fuse blows to prevent an electric shock or
fire hazard.
2. The fuse also blows when the relay RY1 remains closed
with the oven door open and when the monitor switch
SW5 closes.
SPECIAL FUSE F2
1. If the wire harness or electrical components are short-
circuited, this fuse blows to prevent an electric shock or
fire hazard.
2. The fuse blows when the asymmetric rectifier, H.V.
rectifier, H.V. wire harness, H.V. capacitor, magnetron or
secondary winding of high voltage transformer is shorted.
5
R-5L16
Ω
20W
" position, the contacts of the timer
•
" position, the
6 sec. OFF
Approx. 70%
11.9 sec. OFF
Approx. 50%
17.8 sec. OFF
Approx. 30%
22 sec. OFF
Approx. 10%