DOWNLOAD Sharp R-82FBSTM (serv.man2) Service Manual ↓ Size: 1.57 MB | Pages: 46 in PDF or view online for FREE

Model
R-82FBSTM (serv.man2)
Pages
46
Size
1.57 MB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven
File
r-82fbstm-sm2.pdf
Date

Sharp R-82FBSTM (serv.man2) Service Manual ▷ View online

R-82FBSTM - 3
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
WARNING: AGAINST THE CHARGE OF THE HIGH-
VOLTAGE CAPACITOR
The high-voltage capacitor remains charged about 60 sec-
onds after the oven has been switched off. Wait for 60
seconds and then short-circuit the connection of the high-
voltage capacitor (that is, of the connecting lead of the high-
voltage rectifier) against the chassis with the use of an
insulated screwdriver.
Sharp recommend that wherever possible fault-finding is
carried out with the supply disconnected. It may in, some
cases, be necessary to connect the supply after the outer
case has been removed, in this event carry out 3D checks and
then disconnect the leads to the primary of the High voltage
transformer. Ensure that these leads remain isolated from
other components and the oven chassis. (Use insulation tape
if necessary.) When the testing is completed carry out 3D
checks and reconnect the leads to the primary of the High
voltage transformer.
SERVICING
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts will
result in electrocution.
High voltage capacitor, High voltage transformer, Magnetron, High voltage rectifier assembly, High voltage harness.
REMEMBER TO CHECK 4R
1) Reconnect all leads removed from components during
testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run  the oven. Check all functions.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup of
cold water on the oven turntable, close the door and set the
power to HIGH and set the microwave timer for two (2) minutes.
When the two minutes has elapsed (timer at zero) carefully
check that the water is now hot. If the water remains cold carry
out 3D checks and re-examine the connections to the compo-
nent being tested.
When all service work is completed, and the oven is fully
assembled, the microwave power output should be checked and
a microwave leakage test should be carried out.
When troubleshooting the microwave oven, it is helpful to
follow the Sequence of Operation in performing the
checks. Many of the possible causes of trouble will
require that a specific test be performed. These tests are
given a procedure letter which will be found in the "Test
Procedure" section.
IMPORTANT:
If the oven becomes inoperative because of
a blown fuse F1 in the monitored latch switch
- monitor switch - circuit, check the monitored
latch switch and monitor switch and before
replacing the fuse F1.
R-82FBSTM - 4
PRODUCT DESCRIPTION
SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
230 - 240 Volts / 50 Hertz / Single phase, 3 wire earthed
Power Consumption
Microwave cooking
1.50 kW  Approx. 6.5 A
Convection cooking
1.91 kW  Approx. 8.0 A
Top Grill mode ...................... 1.25 kW
Approx. 5.2 A
Grill cooking
Bottom Grill mode ................. 0.70 kW
Approx. 2.9 A
Top and Bottom  mode ......... 1.90 kW
Approx. 7.9 A
Micro and Top Grill ............... 2.70 kW
Approx. 11.5 A
Dual cooking Micro and Bottom Grill .......... 2.15 kW
Approx. 9.2 A
Micro and Convection ........... 2.16 kW
Approx. 9.3 A
Power Output
900 W nominal of RF microwave energy (measured by method of IEC 60705)
Operating fequency 2450 MHz
Top Grill  heating element Power Output
1200 W
Bottom heating element Power Output
650 W
Case Dimensions
Width 520 mm
Height 309 mm (including foot)
Depth 482 mm
Cooking Cavity Dimensions
Width  353 mm
Height 207 mm
Depth 357 mm
Turntable diameter
325 mm
Control Complement
Twin Jog Control System
Clock (1:00 - 12:59) / Timer (0 - 99 minutes 90 sec.)
Microwave Power for Variable Cooking
 Repetition Rate;
100 (HIGH) ....................... Full power throughout the cooking time
70 (MEDIUM HIGH) .........................  approx. 70% of FULL Power
50 (MEDIUM) ...................................  approx. 50% of FULL Power
30 (MEDIUM LOW) ..........................  approx. 30% of FULL Power
10 (LOW) .........................................  approx. 10% of FULL Power
Convection temperature control range:
   250˚C, 230˚C, 220˚C, 200˚C, 180˚C, 160˚C, 130˚C, 100˚C, 70˚C and 40˚C
LESS/MORE buttons, INFO button, AUTO COOK button, PIZZA button,
AUTO DEFOST button, POWER LEVEL button, CONV. (˚C) button,
STOP/CLEAR button, KITCHEN TIMER/CLOCK SET button, 
+
 1min /
START button.
Net Weight
Approx. 19 kg
GENERAL INFORMATION
WARNING
THIS APPLIANCE MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW
: EARTH
BLUE
: NEUTRAL
BROWN
: LIVE
As part of our policy of continuous improvement, we reserve the right to
alter design and specifications without notice
R-82FBSTM - 5
APPEARANCE VIEW
OVEN
1. Control panel
2. Oven lamp
3. Waveguide cover
4. Bottom grill heating ele-
ment (Bottom Grill)
5. Turntable motor shaft
6. Oven cavity
7. Door seals and sealing
surfaces
8. Door latches
9. Door opening handle
10.Top grill heating element
(Top Grill)
11.Fixing points (4 points)
12.Ventilation openings
13.Outer cabinet
14.Powercord
15.Turntable tray
16.High rack
17.Low rack
CONTROL PANEL
NOTE: If the clock has been set, some one-touch cooking features such as "AUTO MINUTE" are disabled after three
minutes when the oven is not used. These features are automatically enabled when the door is opened and closed
or the STOP button is pressed.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
4
17
16
1
2
3
4
5
6
7
8
9
10
11
12
13
1. DIGITAL DISPLAY
2. INFO button
3. LESS/MORE button
4. AUTO DEFROST button
5. PIZZA button
6. AUTO COOK button
7. COOKING MODE dial
8. CONVECTION (°C) button
9. MICROWAVE POWER LEVEL button
10.TIME/WEIGHT dial
11.START    +1min button
12.CLOCK button
13.STOP button
R-82FBSTM - 6
OPERATION SEQUENCE
OFF CONDITION
Closing the door activates the monitored latch switch and
the stop switch.
IMPORTANT:
When the oven door is closed, the contacts COM-NC
of the monitor switch  must be open. When the micro-
wave oven is plugged in a wall outlet (230 - 240V /
50Hz), the line voltage is supplied to the noise filter.
Figure O-1 on page
 32
1. The control unit is not energized. The display shows
nothing (Fig. O-1 (a)).
2. Open the door. The contacts (COM-NC) of the moni-
tored latch switch are closed and the control unit is
energized. Then contacts of relays RY1 and RY5 are
closed, and the oven lamp will light and the display will
show "ENERGY SAVE MODE TO CANCEL ENERGY
SAVE MODE SET THE CLOCK" (Fig. O-1(b)).
3. Close the door. The contacts (COM-NC) of the moni-
tored latch switch are opened and the contacts of relay
RY1 are opened and the oven lamp will be turned off.
The display will show "  .  
0". (Fig. O-1(c)).
NOTE: Energy save mode
1. If the oven has not been used for more than 3 minutes,
the contacts of the relay RY5 will be opened and the
control unit will not be energized. Open and close the
door, the control unit will resume.
2. If the clock is set, this energy save mode does not work.
MICROWAVE COOKING CONDITION
HIGH COOKING
Rotate the COOKING MODE dial to the 
 micro setting.  Press
the MICROWAVE POWER LEVEL button once.  Enter the
cooking time by rotating the TIME/WEIGHT dial.  Start the oven
by pressing START button.
Function sequence Figure O-2 on page 33
CONNECTED COMPONENTS
RELAY
Oven lamp, Turntable motor
RY1
High voltage transformer
RY2
Fan motor
RY6
1. The line voltage is supplied to the primary winding of
the high voltage transformer. The voltage is converted
to about 3.3 volts A.C. output on the filament winding
and high voltage of approximately 2000 volts A.C. on
the secondary winding.
2. The filament winding voltage (3.3 volts) heats the
magnetron filament and the high voltage (2000 volts) is
sent to the voltage doubling circuit, where it is doubled to
negative voltage of approximately 4000 volts D.C..
3. The 2450 MHz microwave energy produced in the
magnetron generates a wavelength of 12.24 cm. This
energy is channelled through the waveguide (trans-
port channel) into the oven cavity, where the food is
placed to be cooked.
4. When the cooking time is up, a signal tone is heard and
the relays RY1 + RY2 + RY6 go back to their home
position. The circuits to the oven lamp, high voltage
transformer, fan motor and turntable motor are cut off.
5. When the oven door is opened during a cooking cycle,
the switches come to the following condition.
Switch
Contact
          Condition
During
Oven Door
Cooking
Open(No cooking)
COM-NO
Closed
Opened
Monitored latch switch
COM-NC
Opened
Closed
Stop switch
COM-NO
Closed
Opened
COM-NO
Closed
Opened
Monitor Switch
COM-NC
Opened
Closed
The circuit to the high voltage transformer is cut off when
the contacts of relay RY2, and the contacts (COM-NO) of
the monitored latch switch and monitor switch are made
open. The circuit to the fan motor is cut off when the relay
RY6 is made open. The circuit to the turntable motor is cut
off when the contacts (COM-NO) of the monitored latch
switch are made open. The relays RY2 and RY6 are made
open when the door is opened. The oven lamp remains on
even if the oven door is opened after the cooking cycle has
been interrupted, because the relay RY1  stays closed.
Shown in the display is remaining time.
6. MONITOR SWITCH CIRCUIT
The monitor switch is mechanically controlled by the
oven door, and monitors the operation of the moni-
tored latch switch.
6-1. When the oven door is opened during or after the
cycle of a cooking program, the monitored latch
switch and stop switch must open their contacts
(COM-NO) first. After that the contacts (COM-NC) of
the monitor switch and monitored latch can be closed.
6-2. When the oven door is closed, the contacts (COM-
NC) of the monitor switch SW3 must be opened and
the contacts (COM-NO) of monitor switch must be
closed. After that the contacts (COM-NO)  of the
monitored latch switch and the stop switch are made
closed, and the contacts (COM-NC) of the monitored
latch switch are made open.
6-3. When the oven door is opened and the contacts
(COM-NO) of  the monitored latch switch remain
closed, the fuse F8A will blow. Because the relay RY1
and monitor switch are closed  and a short circuit is
caused.
MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING
When the microwave oven is preset for variable cooking
power, the line voltage is supplied to the high voltage
transformer intermittently within a 32-second time base
through the relay contact which is coupled with the cur-
rent-limiting relay RY2. The following levels of microwave
power are given.
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.
900W
(HIGH)
32 sec. ON
630W  MEDIUM 
HIGH 
Approx. 70%
100%
24 sec. ON
8 sec. OFF
14 sec. OFF
20 sec. OFF
26 sec. OFF
450W (MEDIUM)
Approx. 50%
18 sec. ON
270W  MEDIUM 
LOW 
Approx. 30%
12 sec. ON
90W
(LOW)
Approx. 10%
6 sec. ON
Page of 46
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  • DOWNLOAD Sharp R-82FBSTM (serv.man2) Service Manual ↓ Size: 1.57 MB | Pages: 46 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp R-82FBSTM (serv.man2) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp R-82FBSTM (serv.man2) Microwave Oven. Information contained in Sharp R-82FBSTM (serv.man2) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.