R-205WM - Sharp Home Appliance Service Manual (repair manual). Page 5

R-205M - 5

Closing the door activates all door interlock switches (moni-
tored latch switch and latch switch).

IMPORTANT
When the timer knob is at "0" the oven is in the OFF
condition.

When the microwave oven is preset for variable cooking
power, the line voltage is supplied to the power transformer
intermittently within a 26-second time base through the
relay contact which is coupled with the current-limiting relay
(RY2). The following levels of microwave power are given.
SETTING

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.

MONITORED LATCH SWITCH (SW1)
LATCH SWITCH (SW3)
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.

MONITOR SWITCH (SW2)
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 monitored latch switch (SW1) fail to open, the fuse
M8A blows simultaneously with closing the contacts
(COM - NC) of the monitor switch (SW2).

CAUTION: BEFORE REPLACING A BLOWN FUSE (F)

M8A TEST THE MONITORED LATCH
SWITCH (SW1), + MONITOR SWITCH (SW2)
FOR PROPER OPERATION.

LATCH HOOK

SW3: LATCH 
SWITCH

SW1: MONITORED
LATCH SWITCH

SW2:  MONITOR 
SWITCH

LATCH
HEADS

OPEN LEVER

DOOR OPEN BUTTON

DOOR

26 sec. ON

20 sec. ON

14 sec. ON

8 sec. ON

4 sec. ON

6 sec. OFF

12 sec. OFF

18 sec. OFF

22 sec. OFF

HIGH

MEDIUM HIGH

MEDIUM

MEDIUM LOW

LOW

Approx. 70% = 560 Watts

Approx.100% = 800 Watts

Approx. 50% = 400 Watts

Approx. 30% = 240 Watts

Approx. 10% = 80 Watts