R-202M - Sharp Home Appliance Service Manual (repair manual). Page 4

202M - 4

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.

Approx. 10% = 80 Watts

26 sec. ON

4 sec. ON

8 sec. ON

14 sec. ON

20 sec. ON

22 sec. OFF

18 sec. OFF

12 sec. OFF

6 sec. OFF

LOW

MEDIUM HIGH

MEDIUM

MEDIUM LOW

HIGH

Approx. 70% = 560 Watts

Approx. 50% = 400 Watts

Approx. 30% = 240 Watts

Approx. 100% = 800 Watts

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.

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.

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 (SW3) fail to open, the fuse
F1 blows simultaneously with closing the contacts (COM
- NC) of the monitor switch (SW2).

CAUTION: BEFORE REPLACING A BLOWN FUSE (F)

F1 TEST THE MONITORED LATCH SWITCH
(SW3), + MONITOR SWITCH (SW2) FOR
PROPER OPERATION.

Latch hook

SW3: Monitored
          Latch switch

Door

SW2: Monitor switch

SW1: Latch switch

Latch heads