Download
Share
Print this page
Sharp R-4A55 Service Manual
  1. Manuals
  2. Brands
  3. Sharp Manuals
  4. Microwave Oven
  5. R-4A55
  6. Service manual
Sharp R-4A55 Service Manual

Sharp R-4A55 Service Manual

Microwave oven r-4a55
Hide thumbs

Advertisement

Quick Links

Download this manual
R4A55
SHARP
SERVICE MANUAL
MICROWAVE OVEN
MODEL
R-4A55
in interests of user-safety
the oven should be restored to its original condi-
t ,
This is a supplimemental
Service Manual For Model R-4A55. This model is Quite similar to Base Model R-4A53
(Refer No. is S7106R4A53PJZ).
Use this supplimemental
manual together with the Base Model Service Manual.
Refer to Base Model Service Manual for complete operation,
service information,
etc.
TABLE OF CONTENTS
page
GENERAL
IMPORTANT
INFORMATION
......................................................................................................
1
WARNING ......................................................................................................................................................
1
RODUCT SPECIFICATIONS
.........................................................................................................................
2
APPEARANCE
VIEW ....................................................................................................................................
3
SERVICING
...................................................................................................................................................
4
TEST PROCEDURE
......................................................................................................................................
5
TOUCH CONTROL
PANEL ...........................................................................................................................
9
COMPONENT
REPLACEMENT
AND ADJUSTMENT
PROCEDURE
.......................................................
.I4
WIRING DIAGRAM
......................................................................................................................................
17
PICTORIAL
DIAGRAM
..................................................
..1................................................................~
.......... 18
CONTROL
PANEL CIRCUIT
......................................................................................................................
.I9
PRINTED WIRING BOA0 ............................................................................................................................
20
PARTS LIST .................................................................................................................................................
21
SHARP CORPORATION

Advertisement

loading
Need help?

Need help?

Do you have a question about the R-4A55 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Sharp R-4A55

Summary of Contents for Sharp R-4A55

  • Page 1 This is a supplimemental Service Manual For Model R-4A55. This model is Quite similar to Base Model R-4A53 (Refer No. is S7106R4A53PJZ). Use this supplimemental manual together with the Base Model Service Manual.
  • Page 2 OVEN R-4A55 APPEARANCE VIEW 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 en- tire text of this manual, so that they will be qualified to render sat- isfactory customer service.
  • Page 3 PRODUCT SPECIFICATIONS DESCRIPTION ITEM 240 Volts Power Requirements 50 Hertz Single phase, 3 wire earthed 1.4 kW Power Consumption 750 watts nominal of RF microwave energy (AS 2895 1986) Power Output 900 watts (I EC-705-1 988 ) Operating frequency of 2450MHz Width 550mm Case Dimensions Height 312mm...
  • Page 4 R4A55 APPEARANCE VIEW 1 .Ventilation openings 8.Touch Control Panel 2.Oven lamp 9.Digital readout 3.Hinges 1 O.Waveguide cover 4.Safety door latches 11 .Access cover for oven lamp replacement 5.See through door 12.Power supply cord 6.Coupling 7.Door open button TOUCH CONTROL PANEL INSTANT ACTION PADS - - 2,3 or 4 SERVE QUANTITY Press once to cook or reheat...
  • Page 5 Sharp recommend that wherever possible fault-find- ing is carried out with the supply disconnected. may in, some cases, be necessary to connect the supply after the outer case has been removed, this event carry out 3D checks and then disconnect the leads to the primary of the power transformer.
  • Page 6 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL ’ WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECKS Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament terminal.
  • Page 7 TEST PROCEDURES PROCEDURE COMPONENT TEST LElTER of the water rises by a value A T of 4. Operate the microwave oven at HIGH for the temperature (10 I!I 2)“C. 5. Stir the water to equalize temperature throughout the vessel. 6. Measure the final water temperature. (Example: The final temperature T2 = 21 “C) 7.
  • Page 8 R-4A55 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST F) The time must be measured with stopwatch or wristwatch. G) After 1 minute and 51 seconds, stop the oven by opening the door. H) Put the two (2) beakers out of the oven cavity and measure the temperature...
  • Page 9 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST b) Clock does not operate properly. c) Cooking is not possible. d) Proper temperature measurement is not obtained. RELAY TEST 1. CARRY OUT 3D CHECKS Disconnect the leads from the primary of the power transformer. Make sure that the leads remain isolated from other oven components and chassis.
  • Page 10 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following unit as 3) Synchronizing Signal Circuit shown in the touch control panel circuit This power source synchronizing signal is available in (1) Key Unit order to compose a basic standard time in the clock (2) Control Unit circuit.
  • Page 11 R-4A55 DESCRIPTION OF LSI LSI(IZA430DR) The I/O signal of the LSI(IZA430DR) is detailed in the following table. PIN NO. DESCRIPTION Diqit selection signal. Refer to the touch control panel circuit about the relation between signals and digits. ’ Normally, one pulse is output in every synchronized...
  • Page 12 PIN NO. 1 SIGNAL DESCRIPTION Seqment data siqnal. Signal similar to Dl I. Kev strobe siqnal. Signal applied to touch-key section. A pulse signal is input to R2s,R30-R32 terminal while one of G7 line keys on key matrix is touched. ‘2 Seqment data siqnal.
  • Page 13 PIN NO. SIGNAL DESCRIPTION OSCI Internal clock oscillation frequencv input settinq. The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to OSCI terminal. I 3’ I OSC2 1 Internal clock oscillation frequency control outnut. Output to control oscillation input of OSC2.
  • Page 14 SERVICING B.On some models, the power supply cord between the 1 Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the touch control panel and the oven proper is long enough circuits. When handling these parts, the following that they may be separated from each other.
  • Page 15 R4A55 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY. PLEASE FOLLOW THE INSTRUC- TIONS BELOW .BRBEFORE OPERATING THE OVEN. 1. CARRY OUT 3D CHECKS. 2. Door hinge, support or latch hook is damaged. 2. Make sure that a definite “click” can be heard when the 3.
  • Page 16 FAN MOTOR REPLACEMENT REMOVAL CAUTION: Do not use this removed fan blade again. 1. CARRY OUT 3D CHECKS. 2. Disconnect the wire leads from the fan motor. Because the hole(for shaft) of it may become big- ger than a standard one. 3.
  • Page 17 Ff4A55 POWER SUPPLY CORD REPLACEMENT Removal 5. Wind the conductors of Blue and White wires each 1. CARRY OUT 3D CHECKS. other. 2. Disconnect the brown wire of the power supply cord 6. Insert the stripped wire leads into the connector from the fuse holder.
  • Page 18 ,PwP3t- :< ..0 rdkl z * * 0 &g ;7x? r-J-4 240V-50Hz 0 xx 0 3 M ti =+g 52 *p u I”o,F;1 ‘U 0 ti ” ‘I ‘! f-7ciKil ;:2 ‘2 riiq (NEUTRAL] jiiq oyt+ FUSE $pg 5 ,<...
  • Page 20 &%A55 ‘1,’ iG”z/qi LA=-llll~I,&++~ &x2 awlL.2 “I- .- ._...
  • Page 21 R4A55 m.Fm- r”l rfns ./ , ‘.’ *..” Figure S-3. Printed Wiring Boad...
  • Page 22 R-4A55 PARTS LIST Note: The voltage supllied to the part I’*” are greater than 250V. REF. NO. PART NO. DESCRIPTION Q’TY CODE ELECTRICAL PARTS Te-mp. f-dse 15C ‘C ?.23e holder -..--AZ2 :;I(yi S'V.: i itctl (‘.'-lo'G-2CZ5) 2 ;; i- 4...
  • Page 23 Note: The voltage supllied to the part “*” are greater than 250V. PART NO. REF. NO. DESCRIPTION Q’TY CODE F.41 vR3-B12E”5i2~ ;/4w Resisr,or 5.lk Ok!! -vm-s12=332, ; i .3k o?,r. 1 4K 365-71 .L- Ad Resistor =l "A\7 ;z?c-3'y-~" 3 8 ': RR-XA019DREO Reslszor ULLU_...
  • Page 24 Note: The voltage supllied to the part “*” are greater than 25OV. Q’TY CODE REF. NO. PART NO. DESCRIPTION iBNDKAO49wREO Wire tight 6-14 AND PINS SCREW, NUTS, WASHERS Screw; M3 X 10 zir,c piated steel 7- 1 XFPSD30PlOOOO XOTSD40P12RVO Screw; M4 x 12 7- 2 Screw;...
  • Page 25 R-4A55 CABINET PARTS...
  • Page 26 CONTROL PANEL PARTS DOOR PARTS ’ /’ ‘/...
  • Page 27 ADD KIT CPADBAll BWRKO) TOP PAD TRAY HOLDER PLASTIC ’ SSAKHAOIZWREO ’ . SPADFAZOBWREO T”RNTABLE DOOR PROTECTION SHEET SPADA178WREO INSTRUCTION BOOK,& ROLLER STAY DOOR PAD SPADFAO61 WREO TRAY HOLDER SPADFA207WREO Not replacement Items. ‘93 SHARP CORP. (08K0.73E) Printed in Australia...