Function Of Important Components - Sharp R-84ST Service Manual

POWER SETTING
The power setting of the top heating element, bottom heating
element and fan motor in the oven cooking mode and
preheating mode is 100%.
ON/OFF TIME RATIO
In grill cooking, convection cooking or dual cooking, the top
heater, bottom heater or magnetron operate whithin a 48
second time base. The following table is the ON / OFF time
ratio at each power output of the top heaters, bottom heater or
magnetron.
POWER OUTPUT
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
AUTOMATIC COOKING
FRESH PIZZA/ FRESH QUICHE
FROZEN PIZZA/ FROZEN QUICHE
FRENCH FRIED POTATO
BOILED/ JACKET POTATOES
INSTANT ACTION
Above functions are automatic cooking. They automatically
work out the correct cooking mode and cooking time and/or
cooking temperature. They will cook according to the special
cooking sequence.
LIMITATIONS OF POWER OUTPUT IN MANUAL OPERA-
TION
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
Cooking mode time (minutes)
Microwave (100%) 20
Top grill 30
Bottom grill 45
Top grill and 15 (Top)
Bottom grill 15(Bottom)
Micro. (100%) 20 (Micro.)
D
+ Top grill 15 (Grill)
U
A
Micro. (100%) 20 (Micro.)
L
+ Bottom grill 15 (Heater)

FUNCTION OF IMPORTANT COMPONENTS

ON TIME OFF TIME
48 sec. 0 sec.
44 sec. 4 sec.
40 sec. 8 sec.
36 sec. 12 sec.
32 sec. 16 sec.
26 sec. 22 sec.
22 sec. 26 sec.
16 sec. 32 sec.
12 sec. 36 sec.
8 sec. 40 sec.
Time base
output (%) (seconds)
70 32
50 48
50 48
50 48
50 48
70 48
50 48
70 48
50 48
R-84ST -
NOTE:
1. In case of Automatic operations, the limitations of power
output are not carried out.
2. If the stop key is touched 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 the case of two or more of the same cooking modes
being carried out, the limitations of power output are not
carried out after the total cooking time beyond the specified
cooking time.
4. In the case of two or more different cooking modes being
carried out, the specified cooking time starts 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.
DOOR OPEN MECHANISM
The door can be opened by pushing the open button on the
control panel. When the open button is pushed, the open
lever pushes lower latch head on the door upward. The
upper latch head is linked with the lower latch head, so now,
the door can be opened.
LATCH HOOK
LATCH
HEADS
DOOR OPEN BUTTON
Figure D-1. Door Open Mechanism
MONITORED LATCH SWITCH SW1
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.
STOP SWITCH SW2
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
switch must be opened.
11
MONITOR
SWITCH
MONITORED LATCH
SWITCH
STOP SWITCH
OPEN LEVER