R-254M (serv.man5). Complete - Sharp Home Appliance Service Manual (repair manual)

r-254m (serv.man5) service manual
Model
R-254M (serv.man5)
Pages
36
Size
699.5 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Complete
File
r-254m-sm5.pdf
Date

Read Sharp R-254M (serv.man5) Service Manual online

R-254M - 1
TABLE OF CONTENTS
Page
CAUTION, MICROWAVE RADIATION ....................................................................................................   2
WARNING ................................................................................................................................................. 3
PRODUCT SPECIFICATIONS ................................................................................................................. 4
GENERAL INFORMATION ....................................................................................................................... 4
APPEARANCE VIEW ..............................................................................................................................  5
OPERATION SEQUENCE ........................................................................................................................ 6
FUNCTION OF IMPORTANT COMPONENTS .......................................................................................  7
TROUBLESHOOTING GUIDE ................................................................................................................. 8
TEST PROCEDURE ................................................................................................................................  9
CONTROL  PANEL ASSEMBLY ............................................................................................................ 15
SERVICING ...........................................................................................................................................  19
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................... 20
MICROWAVE MEASUREMENT ...........................................................................................................   25
SCHEMATIC DIAGRAMS ......................................................................................................................  26
PICTORIAL DIAGRAM ..........................................................................................................................  27
POWER UNIT CIRCUIT DIAGRAM ........................................................................................................ 28
CONTROL PANEL CIRCUIT DIAGRAM ................................................................................................ 29
PRINTED WIRING BOARD .................................................................................................................... 30
PARTS LIST ........................................................................................................................................... 31
EXPLODED DIAGRAM OF OVEN PARTS ............................................................................................ 33
EXPLODED DIAGRAM OF DOOR/CONTOL PANEL PARTS ............................................................... 34
MISCELLANEOUS/PACKING & ACCESSORIES .................................................................................. 35
S50195R254M//
MICROWAVE OVEN
MODELS
R-254(W)M
R-254(SL)M
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
 SERVICE MANUAL
SHARP CORPORATION
R-254M - 2
SERVICING
PRODUCT SPECIFICATIONS
GENERAL INFORMATION
APPEARANCE VIEW
OPERATING SEQUENCE
FUNCTION OF IMPORTANT
COMPONENTS
TROUBLESHOOTING GUIDE
AND TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
MICROWAVE MEASUREMENT
WIRING DIAGRAM
PARTS LIST
SHARP CORPORATION
OSAKA, JAPAN
SERVICE MANUAL
MICROWAVE OVEN
  R-254(W)M/ R-254(SL)M
GENERAL IMPORTANT INFORMATION
This Manual has been prepared to provide Sharp Corp. Service
engineers with Operation and Service Information.
It is recommended that service engineers carefully study the entire
text of this manual, so they will be qualified to render satisfactory
customer service.
CAUTION
MICROWAVE RADIATION
Service engineers should not be exposed to the microwave
energy which may radiate from the magnetron or other micro-
wave generating devices if it is improperly used or connected.
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.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained
service engineers.
All the parts marked "*" on parts list are used at voltages more than
250V.
Removal of the outer wrap gives access to potentials above 250V.
All the parts marked "
" on parts list may cause undue microwave
exposure, by themselves, or when they are damaged, loosened or
removed.
R-254M - 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 seconds after the oven has been switched off.
Wait for 60 seconds and then short-circuit the con-
nection 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.
REMEMBER TO CHECK 4R
1) Reconnect all leads removed from components dur-
ing 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 microwave timer for two (2) minutes. And set
the power level to HIGH (100%) and push the start key.
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 component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be
checked and microwave leakage test should be carried
out.
 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 , High voltage harness.
R-254M - 4
  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
SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
230 - 240 Volts
50 Hertz
Single phase, 3 wire earthed
Power Consumption
1.2 kW
Power Output
800 W nominal of RF microwave energy (measured by method of IEC 705)
Operating frequency 2450 MHz
Case Dimensions
Width
449 mm
Height
282 mm including foot
Depth
385 mm
Cooking Cavity Dimensions
Width
287 mm
Height
220 mm
Depth
311 mm
Turntable diameter
272 mm
Control Complement
Touch Control System
Clock (1.00 - 12.59 or 0.00 - 23.59) - 12HR or 24HR setting
Timer (0 - 99 minutes and 90 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
100P (HIGH) .......................... Full power throughout the cooking time
70P (MEDIUM HIGH) ...............................  approx. 70% of Full Power
50P (MEDIUM) .........................................  approx. 50% of Full Power
30P (MEDIUM LOW) ................................  approx. 30% of Full Power
10P (LOW) ................................................  approx. 10% of Full Power
TIME keys,
EXPRESS COOK keys
EXPRESS DEFROST keys
MEAL IN ONE keys
AUTO COOK keys
LESS/MORE keys
DELAY START/CLOCK SET key
START/AUTO MINUTE key
STOP/CLEAR key
POWER LEVEL
WEIGHT CONVERSION key
KITCHEN TIMER key
WEIGHT keys
As part of our policy of continuous improvement, we reserve the
right to alter design and specifications without notice
Net Weight
Approx. 13.kg
 PRODUCT DESCRIPTION
Page of 36
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Here you can read online and download Sharp R-254M (serv.man5) Service Manual in PDF. R-254M (serv.man5) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp R-254M (serv.man5) 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.