Sharp R-84ST (serv.man3) Service Manual ▷ View online
R-84STM - 2
SERVICING
AFTER REPAIR 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.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
When all service work is completed, and the oven is fully assembled, the microwave power output should be checked
and microwave leakage test carried out.
and microwave leakage test carried out.
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, High voltage wires.
will result in electrocution:-
High voltage capacitor, High voltage transformer, Magnetron, High voltage rectifier, High voltage wires.
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
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 seconds 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 using a screwdriver with an insulated handle.
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 using a screwdriver with an insulated handle.
Sharp recommend that wherever possible, fault-finding is carried out with the supply disconnected. In some cases, it
may be necessary to connect the supply with the cover removed to carry out fault investigation in the control circuitry.
In such cases, the high voltage circuit should be disabled as described below to reduce the hazards:-
may be necessary to connect the supply with the cover removed to carry out fault investigation in the control circuitry.
In such cases, the high voltage circuit should be disabled as described below to reduce the hazards:-
•
Carry out 3D checks (see above).
•
Disconnect the supply leads from the high voltage transformer, making a note of the polarity. Insulate the
connectors, ensuring they are positioned away from the transformer and fastened there.
connectors, ensuring they are positioned away from the transformer and fastened there.
•
Connect any relevant test equipment e.g. voltmeter.
•
Reconnect the oven to the supply, then close the door.
•
Note the results of the test, taking care to keep clear of the operational oven.
•
Carry out 3D checks (see above).
•
Reconnect the leads to the transformer. Take care to observe correct polarity.
•
Carry out 4R checks (see below).
Microwave ovens should not be used without a load. 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 microwave timer for one (1) minute, set the
power level to HIGH (100%) and push the start key. When the one (1) minute has elapsed (timer at zero) carefully check
that the water is now hot.
place a cup of cold water on the oven turntable, close the door and set the microwave timer for one (1) minute, set the
power level to HIGH (100%) and push the start key. When the one (1) minute has elapsed (timer at zero) carefully check
that the water is now hot.
IMPORTANT:
If the oven becomes inoperative because of a blown fuse F8A Fuse, check the monitored latch switch
and monitor switch before replacing the fuse F8A.
and monitor switch before replacing the fuse F8A.
WARNING: WIRING / RE-WIRING
Before carrying out any work; carry out 3D checks.
1) Disconnect the supply.
2) Open the door and wedge open.
3) Discharge the high voltage capacitor.
1) Disconnect the supply.
2) Open the door and wedge open.
3) Discharge the high voltage capacitor.
RE-WIRING
1) Wires must not touch:
a) High voltage parts.
b) Parts that become hot.
c) Sharp edges.
d) Movable parts.
b) Parts that become hot.
c) Sharp edges.
d) Movable parts.
2) Positive lock connectors are fitted correctly
3) Wires are connected correctly as per pictorial diagram.
4) No wire leads are trapped by the outer wrap.
3) Wires are connected correctly as per pictorial diagram.
4) No wire leads are trapped by the outer wrap.
R-84STM - 3
WARNING
Servicing and repair work must be carried out only by
trained service engineers.
trained service engineers.
The parts marked '*' on the parts list and schematic
diagram have voltages in excess of 250V.
diagram have voltages in excess of 250V.
Removal of the outer wrap gives access to potential
above 250V.
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.
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.
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.
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
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
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
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
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.
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.
