R-242M - Sharp Home Appliance Service Manual (repair manual)

r-242m service manual
Model
R-242M
Pages
28
Size
668.72 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven
File
r-242m.pdf
Date

Read Sharp R-242M Service Manual online

R-242M - 1
SHARP CORPORATION
SERVICE MANUAL
S10951R242M//
R
MICROWAVE OVEN
MODELS
R-242(W)M
R-242(G)M
R-242(BL)M
SERVICING .............................................................................................................................................  2
CAUTION/WARNING ...............................................................................................................................  3
PRODUCT SPECIFICATIONS ................................................................................................................  3
APPEARANCE VIEW................................................................................................................................ .4
OPERATION SEQUENCE ........................................................................................................................ 5
OUTPUT POWER TEST PROCEDURE ................................................................................................... 6
TEST PROCEDURES................................................................................................................................ 7
TOUCH CONTROL ASSEMBLY .............................................................................................................. 8
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................... 12
MICROWAVE MEASUREMENT PROCEDURE...................................................................................... 15
WIRING DIAGRAM...................................................................................................................................16
PICTORIAL DIAGRAM ..........................................................................................................................  17
CONTROL PANEL CIRCUIT .................................................................................................................  18
PRINTED WIRING DIAGRAM ...............................................................................................................  19
PARTS LIST ...........................................................................................................................................  20
PACKING AND ACCESSORIES ...........................................................................................................  25
TABLE OF CONTENTS
       Page
In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.
2
R-242M -
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.
REMEMBER TO CHECK 3D
1)
D
isconnect the supply.
2)
D
oor opened, and wedged open.
3)
D
ischarge 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 from  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:-
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.
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.
AFTER REPAIR REMEMBER TO CHECK 4R
1)
R
econnect all leads removed from components during testing.
2)
R
eplace the outer case (cabinet).
3)
R
econnect the supply.
4)
R
un 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.
IMPORTANT:
If the oven becomes inoperative because of a blown  F8A Fuse, check the monitored latch switch and
monitor switch before replacing the fuse .
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.
RE-WIRING
1) Wires must not touch:
a) High voltage 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.
 WARNING TO SERVICE PERSONNEL
SERVICING
R-242M - 3
CAUTION / WARNING
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 an-
tenna while the device is energized.
WARNING
THIS APPLIANCE MUST BE EARTHED
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 QACCBA030WRE2 should be used
  SPECIFICATION
Power Requirements
230-240 Volts      50 Hertz      Single phase, 3 wire grounded
Power Consumption
1.24 kW
Power Output
800W watts nominal of RF microwave energy (measured by way of IEC 705)
Operating frequency of 2450 MHz
Case Dimensions
Width 449mm / Height 282mm including foot / Depth 385mm
Cooking Cavity Dimensions
Width 287mm / Height 220mm / Depth 313mm
Turntable diameter
272mm
Control Complement
Touch Control System
Clock(1:00-12:59 or 0:00-23:59)
Microwave Power for Variable Cooking
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
AUTO COOK/DEFROST button
POWER LEVEL button
STOP button
START button
Net Weight
Approx. 13.3 kg
 
  
PRODUCT DESCRIPTION
4
R-242M -
  APPEARANCE VIEW
OVEN
1.  Door
2.  Door hinges
3.  Waveguide cover
4.  Oven lamp
5.  Control panel
6.  Rubber seal
7.  Door latch openings
8.  Oven cavity
9.  Door seals and sealing surfaces
10.  Safety door latches
11.  Ventilation openings
12.  Outer case
13.  Power supply cord
3
4
1
10
7
6
2
9
8
11
5
12
13
Turntable 
Roller stay
Seal packing
1.
Place the roller stay on the floor of the oven cavity,
engaging shaft.
2.
Then place the turntable on the roller stay.
1.   DIGITAL DISPLAY
2.   AUTO COOK Menu
3.   AUTO DEFROST Menu
4.     AUTO COOK/AUTO DEFROSTPad
5.   POWER LEVEL/WEIGHT Pad
6.   STOP/CLEAR Pad
7.   START/AUTO MINUTE Pad
8.   TIMER Pads
1
4
5
6
7
8
3
2
Page of 28
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Download Sharp R-242M Service Manual (Repair Manual)

Here you can read online and download Sharp R-242M Service Manual in PDF. R-242M service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp R-242M Microwave Oven. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.