Sharp Carousel R-880F Manuale di servizio - Pagina 10
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R-880F(S)
judgment that there is a fire in the oven cavity and will
switch off the relays to the power transformer, fan
motor, turntable motor and the oven lamp. The LSI
also stops counting down.
3. Once the fire sensor feature has shut the unit down, the
programmed cooking cycle may be resumed by press-
ing the "START" pad or the unit may be reset by
pressing the "CLEAR" pad.
IMPORTANT:
During sensor cooking operation, the fire sensing op-
eration sequence will not begin until the AH sensor has
detected vapours and initiated a sensor cooking cycle.
This is because the operation of the convection fan
would interfere with the AH sensor's vapour detection.
0 2 3
24
6 sec.
CONVECTION
MOTOR
ON
OFF
3 sec.
THERMISTOR
ON
OFF
ON
Sensing
Voltage
OFF
Sensing the voltage across temperature measurement circuit.
DOOR OPEN MECHANISM
The door can be opened by pushing the open button on the
control panel. When the open button is pushed, the switch
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 Heads
Door
Figure D-1. Door Open Mechanism
30 32 (sec.)
64 (sec.)
FUNCTION OF IMPORTANT COMPONENTS
Latch Hook
2nd. Interlock
Relay Control
Switch
Monitor Switch
1st. Latch Switch
Switch Lever
ON/OFF TIME RATIO
In grill cooking, convection cooking or mix cooking, the top
heaters, 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%
1ST. LATCH SWITCH AND 2ND. INTERLOCK
RELAY CONTROL SWITCH
1. When the oven door is closed, the contacts (COM-NO)
of each switch must be closed.
2. When the oven door is opened, the contacts (COM-
NO) of each switch must be opened.
MONITOR SWITCH
1. When the door is closed, the contacts (COM-NC) must
be opened.
2. When the door is opened, the contacts (COM-NC)
must be closed.
3. If the oven door is opened and he contacts (COM-NO)
of the 1st. latch switch and 2nd. interlock relay (RY2)
fail to open, the fuse F10A blows immediately after
closing the contacts (COM-NC) of the monitor switch.
CAUTION: BEFORE REPLACING A BLOWN FUSE F10A
TEST THE 1ST. LATCH SWITCH, 2ND. IN-
TERLOCK RELAY (RY2) AND MONITOR
SWITCH FOR PROPER OPERATION. (RE-
FER TO CHAPTER "TEST PROCEDURE").
8
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.