R-671M - Sharp Home Appliance Service Manual (repair manual). Page 8

R-671M  -  8

6. The relay RY5 stays closed for five (5) minutes, and the

fan motor operates.

These functions automatically work out the correct cooking
mode and time for cooking/defrosting. The oven will cook
or defrost according to the special cooking/defrosting
sequence.

After the same cooking mode is carried out for more than
the specified cooking time, the power output is automatically
reduced by turning the control relays on and off
intermittently, as shown in the table below. This is to
protect the oven door against temperature rising.

Specified cooking

Limited power

Time base

Cooking mode

time (minutes)

output (%)

(seconds)

Microwave (100%)

30

70

32

Top Grill

30

50

48

Bottom Grill

30

50

48

Top Grill and

10 (Top)

50

48

Bottom Grill

10 (Bottom)

50

48

Micro.(100%)

20 (Micro.)

70

48

+ Top Grill

15 (Grill)

50

48

Micro.(100%)

20 (Micro.)

70

48

+ Bottom Grill

15 (Heater)

50

48

1. In case of Automatic operations, the limitations of

power output are not carried out.

2. In case that the STOP key is pressed or the oven door

is opened during cooking, the limitations of power
output are not carried out after the total cooking time
beyond the specified cooking time.

3. In case of the two or more same cooking modes  are

carried out,  the limitations of power output are not
carried out after the total cooking time beyond the
specified cooking time.

4. In case of the two or more different cooking modes  are

carried out,  the specified cooking time is started to
count from the point when the cooking mode is changed.

5. If the cooking mode has the power level display, the

power level is also displayed when the limitations of
power output are carried out.

D

U

A

L

1. When the oven door is closed, the contacts (COM-NO)

of the switch must be closed.

2. When the oven door is opened, the contacts (COM-

NO) of the switch must be opened.

1. When the oven door is closed, the contacts (COM-NO)

of the switch must be closed and the contacts (COM-
NC) must be opened.

2. When the oven door is opened, the contacts (COM-

NO) of the switch must be opened and the contacts
(COM-NC) must be closed.

1. When the door is closed, the contacts (COM-NC) must

be opened and the contacts (COM-NO)  must be
closed.

2. When the 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 (COM-NO)

of the monitored latch switch fail to open, the fuse F8A
blows immediately after closing the contacts (COM-
NC) of the monitor switch.

CAUTION: BEFORE REPLACING A BLOWN FUSE  F8A,

TEST THE MONITORED LATCH SWITCH,
MONITOR SWITCH. FOR PROPER
OPERATION.  (REFER TO CHAPTER “TEST
PROCEDURE”).

If the wire harness or electrical components are short-
circuited, this fuse blows to prevent an electric shock of fire
hazard.

1. If the wire harness or electrical components are short-

circuited, this fuse blows to prevent an electric shock of
fire hazard.

2. The fuse also blows when the primary (monitored)

latch switch remains closed with the oven door open
and when the monitor switch contact (COM-NC) closes.