DOWNLOAD Sharp R-84ST (serv.man6) Service Manual ↓ Size: 1.12 MB | Pages: 30 in PDF or view online for FREE

Model
R-84ST (serv.man6)
Pages
30
Size
1.12 MB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Complete
File
r-84st-sm6.pdf
Date

Sharp R-84ST (serv.man6) Service Manual ▷ View online

R-84STM - 3
WARNING
Servicing and repair work must be carried out only by
trained service engineers.
The parts marked '*' on the parts list and schematic
diagram have voltages in excess of 250V.
Removal of the outer wrap gives access to potential
above 250V.
All the parts marked "
∆" on the parts list may cause undue
microwave exposure, by themselves, or when they are
damaged, loosened or removed.
CAUTION
MICROWAVE RADIATION
Do not become exposed to radiation from the
magnetron or other parts conducting microwave
energy.  All input and output microwave connections,
waveguides, flanges and gaskets must be secured.
Never operate the device without a microwave
energy absorbing load attached. Never look into an
open waveguide or antenna while the device is
energized.
CAUTION / WARNING
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
If the mains lead is replaced, only part number QACCBA004URE3 should be used
R-84STM - 4
OVEN
APPEARANCE VIEW
1
2
3
4
5
8
7
6 10
9
10
12
11
1.
Grill heating element (top grill)
2.
Oven lamp
3.
Control panel
4.
Door opening button
5.
Waveguide cover
6.
Oven cavity
CONTROL PANEL
7.
Turntable motor shaft
8.
Grill heating element (bottom grill)
9.
Door seals
10.
Air-vent openings
11.
Outer cabinet
12.
Power cord
   4
   3
   2
   1
   5
  6
 7
 8
 9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 25
 26
 27
 24
DIGITALAL DISPLAY
1.
MICROWAVE indicator
2.
CONVECTION indicator
3.
BOTTOM GRILL indicator
4.
TOP GRILL indicator
5.
COOK indicator
6.
DEFROST indicator
7.
AUTO indicator
8.
LESS/MORE indicators
9.
INFO indicator
           10.
MICROWAVE POWER LEVEL percentage
           11.
WEIGHT indicators
CONTROL PANEL
           12.
TIME keys
           13.
INSTANT COOK keys
           14.
EXPRESS COOK keys
           15.
EXPRESS DEFROST keys
           16.
MEAL IN ONE keys
           17.
CONV. (
0
C) key
           18.
DUAL CONV./GRILL key
           19.
LESS/MORE keys
           20.
INFO key
           21.
START/AUTO MINUTE key
           22.
STOP/CLEAR key
           23.
KITCHEN TIMER/CLOCK SET key
           24.
WEIGHT CONVERSION key
           25.
WEIGHT keys
           26.
MICRO. POWER key
           27.
GRILL key
R-84STM - 5
ITEM
DESCRIPTION
Power Requirements
230 - 240 Volts / 50 Hertz / Single phase, 3 wire earthed
Power Consumption
Microwave cooking                          1.45kW Approx. 6.5A
Dual cooking
(Microwave and Top Grill)                2.4kW Approx. 10.4A
(Microwave and Bottom grill)            1.95kW Approx. 8.5A
(Microwave and Convection)            2.4kW Approx. 10.4A
(Top and Bottom Grill)                      1.55kW Approx. 6.3A
Convection cooking                          2.08kW Approx. 9.1A
Grill Cooking
(Top Grill)                                        1.05kW Approx. 4.2A
(Bottom Grill)                                        0.55kW Approx. 2.3A
Power Output
900 watts nominal of RF microwave energy (measured by method of IEC
60705) Operating fequency 2450 MHz
Grill heating element Power Output
Top Grill 1.kW
Bottom Grill 0.5kW
Case Dimensions
Width 520 mm
Height 309 mm (including foot)
Depth 488 mm
Cooking Cavity Dimensions
Width 349 mm
Height 207 mm
Depth 357 mm
Turntable diameter
325mm
Control Complement
Touch Control System
Microwave Cooking Control
Repetition Rate;
HIGH .............  Full power throughout the cooking time
MEDIUM HIGH .............  approx. 70% of FULL Power
MEDIUM .......................  approx. 50% of FULL Power
MEDIUM LOW ..............  approx. 30% of FULL Power
LOW .............................  approx. 10% of FULL Power
TIME keys                                     STOP/CLEAR key
INSTANT COOK keys                   KITCHEN TIMER/CLOCK SET key
EXPRESS COOK keys                  WEIGHT CONVERSION key
EXPRESS DEFROST keys           WEIGHT keys
MEAL IN
 O
NE keys                      MICRO. POWER key
CONV. (
0
C) key                             GRILL key
DUAL CONV./GRILL key
LESS(
)/MORE(
) keys
INFO keys
START/AUTO MINUTE key
Net Weight
Approx. 20 kg
SPECIFICATION
As part of our policy of continuous improvement, we reserve the right to
alter design and specifications without notice
Note:
Temperature measurements taken whilst the oven is in convection mode will differ from the displayed level.
This is due to the grill elements turning on and off in order to regulate the oven temperature.
This will not affect the cooking results as long as the operation manual and cook book are followed correctly.
R-84STM - 6
OFF CONDITION
Closing the oven door activates all door interlock switches
(monitored latch switch and stop switch).
IMPORTANT:
When the oven door is closed, the contacts COM-NC of the
monitor switch SW2 must be open and the contacts (COM-
NO) must be closed. When the microwave oven is plugged
into a wall outlet (230-240V / 50Hz), 230-240 volts A.C. is
supplied to the point A1 + A3 in the control unit.
1. The display starts demo mode.
2. To set any programmes or set the clock, you must first
touch the STOP key.
3. Information appears on display.
NOTE: When the oven door is opened, the oven lamp
comes on at this time.
MICROWAVE COOKING CONDITION
HIGH COOKING
Enter a desired cooking time with the Time keys and start the
oven with touching START key.
Function sequence Figure O-1 on page 18
CONNECTED COMPONENTS
RELAY
Oven lamp, Turntable motor
RY1
High voltage transformer
RY2
Fan motor
RY6
1 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.
2. 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)
 Monitored latch Switch COM-NO
Closed
Opened
 Monitor Switch
COM-NO
Closed
Opened
 Monitor Switch
COM-NC
Opened
Closed
Stop switch
COM-NO
Closed
Opened
The circuit to the high voltage transformer, is cut off when the
contact of relay RY2 contacts COM-NO of the monitored
latch switch SW1, and monitor switch SW2 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 monitor switch are made open.
The relay 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.
3. MONITOR SWITCH CIRCUIT
The monitor switch SW2 is mechanically controlled by
the oven door, and monitors the operation of the monitored
latch switch SW1.
3-1. When the oven door is opened during or after the cycle
of a cooking program, the monitored latch switch SW1
and stop switch SW3 must open their contacts (COM-
NO) first. After that the contacts (COM-NC) of the
monitor switch SW2 can be closed and the contacts
(COM-NO) of monitor switch SW2 are made open.
3-2. When the oven door is closed. The contacts (COM-NC)
of the monitor switch SW2 must be opened and the
contacts (COM-NO) of monitor switch SW2 must be
closed. After that the contacts of the monitored latch
switch SW1 and the stop switch SW3 are made closed.
3-3. When the oven door is opened and the contacts of the
monitored latch switch SW1 remain closed, the fuse F2
F8A will blow. Because the relay RY1 and monitor
switch SW2 are closed  and a short circuit is caused.
3 seconds  are needed for heating up the
magnetron filament.
32 sec. ON
24 sec. ON
18 sec. ON
12 sec. ON
6 sec. ON
8 sec. OFF
14 sec. OFF
20 sec. OFF
28 sec. OFF
HIGH
MEDIUM
 HIGH
MEDIUM
MEDIUM 
LOW
LOW
Approx. 70%
Approx. 50%
Approx. 30%
Approx. 10%
Approx. 100%
MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING
When the microwave oven is preset for variable cooking
power, the 230-240 volts A.C. power is supplied to the high
voltage transformer intermittently within a 32-second time
base through the relay contact which is coupled with the
current-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.
Approx 100%
OPERATION SEQUENCE
Page of 30
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  • DOWNLOAD Sharp R-84ST (serv.man6) Service Manual ↓ Size: 1.12 MB | Pages: 30 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp R-84ST (serv.man6) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp R-84ST (serv.man6) Microwave Oven. Information contained in Sharp R-84ST (serv.man6) 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.