Sharp R-763 Service Manual

8
R-763 -
DOOR OPEN MECHANISM
The door can be opened by puiiing the door handle. When
the door handle is pulled, the latch head is moved upward,
and released from the latch hook now the door can be
opened.
Figure D-1. Door Open Mechanism
MONITORED LATCH SWITCH SW1
STOP 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 and the contacts (COM - NO) must be
closed.
2. When the oven 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 SW1 fail to open, the fuse F1
F8A blows simultaneously with closing the contacts (
COM
- NC) of the monitor switch SW2.
CAUTION: BEFORE REPLACING A BLOWN FUSE F1 F8A
TEST THE MONITORED LATCH SWITCH SW1
AND MONITOR SWITCH SW2 FOR PROPER
OPERATION. (REFER TO CHAPTER ”TEST
PROCEDURE”.)
GRILL COOKING CONDITION
In this condition the food is cooked by grill heater energy.
Program desired cooking time and grill mode using MODE
button and ROTARY knob. When the START button is
touched, the following operations occur:
Figure O-3 on page 30
1. The relay
RY1 and RY2 are energized.
2. The numbers of the digital readout start the count down
to zero.
3. Then the grill heating elements, turntable motor, oven
lamp and fan motor are energized.
4. Now , the food is grilled by the grill heater.
5. Upon completion of the selected cooking time, audible
signal sounds, and contacts of relays are opened, then
the activated components as item 4 are de-energized.
DUAL COOKING CONDITION
In this condition the food is cooked by both microwave
energy and grill heating elements energy simultaneously.
Figure O-4 on page 30
4. Then following components are energized.
Power transformer Grill heating elements
Magnetron Turntable motor
H.V. capacitor Fan motor
H.V. rectifier Oven lamp
5. Now, the food is cooked by microwave and grill heating
elements energy simultaneously.
6. Upon completion of selected cooking time, audible signal
sounds, and contacts of relays are opened, then the
activated components as item 4 are de- energized.
7. When cooking in dual mode the microwave power is
limited to 70% (via the I.C.).
EXPRESS COOK PROGRAMME
Keep on touching the AUTO COOK pad until the desired
cooking programme appears in the display. Then using the
ROTARY knob, enter the weight and touch the START
button. The cooking modes and cooking time are automatically
computed and selected based on the programmes.
OPERATING SEQUENCE
FUNCTION OF IMPORTANT COMPONENTS
Latch Hooks
Stop Switch
SW3
Monitor Switch
SW2
Monitored Latch
Switch SW1
1. The contact of monitored latch switch SW1 are closed.
2. The relay
RY1, RY2 and RY3 are energized.
3. The numbers of the digital readout start the count down to
zero.

Sharp R-763 Specifications

General

Brand	Sharp
Model	R-763
Category	Microwave Oven
Language	English