R-21FBSTM - Sharp Home Appliance Service Manual (repair manual)

r-21fbstm service manual
Model
R-21FBSTM
Pages
35
Size
876.36 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven
File
r-21fbstm.pdf
Date

Read Sharp R-21FBSTM Service Manual online

R-21FBSTM/R-22FBSTM - 1
SHARP CORPORATION
SERVICE MANUAL
R-21FBSTM
R-22FBSTM
S1000347R21M//
MICROWAVE OVEN
MODELS
SERVICING .............................................................................................................................................. 2
CAUTION, MICROWAVE RADIATION ....................................................................................................   3
GENERAL INFORMATION ....................................................................................................................... 3
PRODUCT SPECIFICATIONS ................................................................................................................. 4
APPEARANCE VIEW ..............................................................................................................................  5
OPERATION SEQUENCE ........................................................................................................................ 6
FUNCTION OF IMPORTANT COMPONENTS .......................................................................................  7
TROUBLESHOOTING GUIDE ................................................................................................................. 8
TEST PROCEDURE ................................................................................................................................  9
CONTROL  PANEL ASSEMBLY ............................................................................................................ 15
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................... 20
MICROWAVE MEASUREMENT ...........................................................................................................   25
TEST DATA AT A GLANCE/WIRING/REWIRING .................................................................................. 26
SCHEMATIC DIAGRAMS ....................................................................................................................... 27
PICTORIAL DIAGRAM ..........................................................................................................................  28
CONTROL PANEL CIRCUIT DIAGRAM ................................................................................................ 29
PRINTED WIRING BOARD OF CONTROL PANEL & SWITCH UNIT DIAGRAMS .............................. 30
PARTS LIST ........................................................................................................................................... 31
EXPLODED DIAGRAM OF OVEN PARTS ............................................................................................ 33
CONTROL PANEL/DOOR PARTS ......................................................................................................... 34
MISCELLANEOUS/PACKING & ACCESSORIES .................................................................................. 35
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.
R-21FBSTM/R-22FBSTM - 2
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.
R-21FBSTM/R-22FBSTM - 3
WARNING
MICROWAVE RADIATION
Personnel should not be exposed to the microwave energy which
may radiate from the magnetron or other microwave 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.
Never operate the Grill heater with the oven outer cabinet
removed.  
(Because air flow is eliminated, and the excess heat
generated on adjacent components). It can cause permanent
damage or a fire.
SHARP CORPORATION
OSAKA, JAPAN
SERVICE MANUAL
®
MICROWAVE OVEN WITH GRILL
  (R-21FBSTM/R-22FBSTM)
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.
R-21FBSTM/R-22FBSTM - 4
SPECIFICATION
  ITEM
   DESCRIPTION
Power Requirements
230-240 Volts
50 Hertz
Single phase, 3 wire earthed
Power Consumption
1.2 kW
Power Output
800W watts nominal of RF microwave energy
(measured by way of IEC 60705)
Operating frequency of 2450 MHz
Case Dimensions
Width 454mm(including screws)
Height 357mm (including foot)
Depth 320mm (excluding handle)
Cooking Cavity Dimensions
Width 305mm
Height 202mm
Depth 298mm
Turntable diameter
272mm
Control Complement
Jog/Touch  Control System
Clock (1.00-12.59 or 0.00-23.59) - 12HR or 24HR setting
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
Stir                                       AUTOMATIC button
Turn over                             MICROWAVE POWER LEVEL button
Weight                                 STOP button
Microwave power level        START/+1 
MIN
 button
Cooking in progress            TIMER/WEIGHT knob
Net Weight
Approx. 15.5 kg (R-21FBSTM)     16Kg (R-22FBSTM)
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
PRODUCT SPECIFICATIONS
GENERAL INFORMATION
As part of our policy of continuous improvement, we reserve the right to
alter design and specifications without notice
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Here you can read online and download Sharp R-21FBSTM Service Manual in PDF. R-21FBSTM service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp R-21FBSTM 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.