Sharp R-4A52 Service Manual
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Sharp R-4A52 Service Manual

Sharp R-4A52 Service Manual

Microwave oven r-4a52; r -4,e52
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Table of Contents

R -4A52
R-4E52
SHARP
SERVICE MANUAL
S0005R4A52PJZ
I'
MICROWAVE
OVEN
MODELS
R-4A52
Photo
R-4A52
R -4,E52
In interests
of user-safety
the oven should
be restored to its original
condition
and only manufacturer
original
spare parts must be used.
TABLE
OF CONTENTS
GENERAL
IMPORTANT
INFORMATION
Page
......................................................................................................
1
CAUTION,
MICROWAVE
RADlATION,WARNING
......................................................................................
PRODUCT
SPECIFICATIONS
1
.........................................................................................................................
APPEARANCE
VIEW
2
........................................................................................................................................
OPERATION
SEQUENCE
3
.................................................................................................................................
FUNCTION
OF IMPORTANT
COMPONENTS
4
SERVICING
..............................................................................................
5
............
TEST PROCEDURE
............................................................................................................................................
7
........................................................................................................................................
TOUCH
CONTROL
ASSEMBLY
10
COMPONENT
REPLACEMENT
AN'~..~~J.USTM'ENT.PR.O.~E.~UR
E ..IIII:::::::I::::::::::::::::::::I:::IIIII::::::Il::::
17
MICROWAVE
MEASUREMENT
23
TEST DATA AT A GLANCE
...................................................................................................................
30
WIRING
DIAGRAM
.................................................................................
-. ........................................
31
.......................
PICTORIAL
DIAGRAM
. ...............................................................................................................
32
... ....
CONTROL
PANEL CIRCUIT
...........................................................................................................................
34
. .
PRINTED WIRING
DIAGRAM
.......................................................................................................................
36
PARTS LIST
.....................................................................................................................
38
....................................................................................................................................................
PACKING
AND ACCESSORIES
39
...................................................................................................................
45
SHARP CORPORATION

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  • Page 1 R -4A52 R-4E52 SERVICE MANUAL SHARP S0005R4A52PJZ I’ MICROWAVE OVEN MODELS R-4A52 R -4,E52 Photo R-4A52 In interests of user-safety the oven should be restored to its original condition and only manufacturer original spare parts must be used. TABLE OF CONTENTS Page ......................

  • Page 2: Troubleshooting

    MICROWAVE OVEN OPERATING SEQUENCE R-4A521 R-4E52 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 TROUBLESHOOTING CHAR entire text of this manual,...

  • Page 3: Specification

    Power Output Operating frequency of 2450M Hz ____ ’ Width 550mm Outside Dimensions Height 312mm ‘-Depth 417mm for R-4E52 420mm for R-4A52 Width 381 mm Cooking Cavity Dimensions 1 Height 210 mm Depth 411 mm 360mm Turntable diameter Touch Control...
  • Page 4 6. Coupling and seat the turntable on 14. Turntable 7. Door open button the roller stay. Touch Control Panel for R-4E52 Touch Control Panel for R-4A52 - EASY REHEAT INSTANT ACTION Touch to select EasV Reheat INSTANT ACTION PADS mode.
  • Page 5 R-&u2 R-4E52 OPERATING SEQUENCE 4. When the cooking time is up, a signal tone is heard OFF CONDITION and the relays RYI + RY2 go back to their home Closing the door activates all door interlock switches (Upper latch switch, Lower latch switch...
  • Page 6 R-4A52 R-4E52 MEDIUM HIGH, MEDIUM, MEDIUM LOW, SETTING LOW COOKING 32 sec. ON When the microwave oven is preset for variable cook- HIGH ing power, 240 volts A.C. power is supplied to the power transformer intermittently within a 32-second 24 sec. ON 8 sec.
  • Page 7 R-4A52 R-4E52 ASYMMETRIC RECTIFIER FUSE _E M8A 250A The asymmetric rectifier is a solid state device that 1. If the wire harness or electrical components prevents current flow in both directions. And it pre- short-circuited, this fuse blows to prevent...

  • Page 8: To Service Personnel

    R-4A52 R-4E52 SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the high voltage circuit will result in electrocution. REMEMBER TO CHECK REMEMBER TO CHECK 1) Reconnect...
  • Page 9 R-4A52 R-4E52 NOTE: “0” means direct cause and part. “A” means indirect cause and part. ~UOO~03Uw > icr< 3Z$;$E PROBLEM I’a Home fuse blows when power supply cord is plugged into wall outlet. Fuse M8A blows when power supply cord is plugged into wall receptacle.
  • Page 10 R -4A52 R-4E52 0 % 7 5 9 I- : 2 22...
  • Page 11 R -4A52 R-4E52 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON TEST -----. j NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED 1 TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECKS Isolate the magnetron from the high voltage circuit by removing all leads connected...
  • Page 12 R-4A52 R-4E52 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER Example: Tl = 20°C, T2 = 21 “C Tl ‘=lO”C T2=11”C initial temperature ~~ = 20°C T2 = 21 “C Temperature after 1 min. 52 sec. ,!LTl =lO”C LIT~=IO”C Temperature difference...
  • Page 13 R-4A52 R-4E52 TEST PROCEDURES (CONT’D) PROCEDURE LETTER COMPONENT TEST HIGH VOLTAGE RECTIFIER ASSEMBLY TEST HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS. Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range.
  • Page 14 R -4A52 R-4E52 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER SWITCH TEST CARRY OUT 3D CHECKS. Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table. Table: Terminal Connection of Switch COM to NC Plunger Operation COM to NO...
  • Page 15 R -4A52 R-4E52 TEST PROCEDURES (CONT’D) PROCEDURE LETTER COMPONENT TEST TEMPERATURE FUSE OR THERMAL CUT OUT TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the temp. fuse or thermal cut-out. Then using an ohmmeter, make a continuity test across the each two terminals as described in the table below.
  • Page 16 R -4A52 R-4E52 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER LIVE TEST FOR MOTOR WINDINGS CAUTION: The following procedure requires the oven to be connected to the supply and should only be used if the relevant “cold” checks for the motor der test are inconclusive.
  • Page 17 R-4A52 R-4E52 TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, lCs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with In this service manual, the touch control...

  • Page 18: Control Panel Assembly

    R-4A52 A-4E52 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following ACL Circuit units as shown in the touch control panel circuit. A circuit to generate a signal which resets the LSI (1) Key Unit to the initial state when power is supplied.
  • Page 19 R -4A52 R-4E52 DESCRIPTION OF LSI LSI( IZA312DR) The I/O signals of the LSI(IZA312DR) are detailed in the following table, 1 SIGNAL PIN NO. j OUT ’ __-.-- __ ---- Signal to sound buzzer. Key touch sound (0.12 sec.). Completion sound (2.4 sec.).
  • Page 20 R-4A52 R-4E52 I I/O j OUT 1 SIGNAL 1 S2 j 13 PIN NO. Segment data signal. Signal similar to FO. Kev strobe signal. Signal applied to touch-key section; A pulse signal is input to K4-K7 terminal while one of D-6 line keys on key matrix is touched.
  • Page 21 R -4A52 R-4E52 I I/O j 22-24 SIGNAL / Dll-D9 PIN NO. / OUT Diqit selection siqnal. Refer to the touch control panel circuit about the relation between signals and digits. Normally, one pulse is output in every synchronized signal period, and input to the grid of the fluorescent display.
  • Page 22 R -4A52 R-4E52 1 SIGNAL 1 K6 1 IN PIN NO. i-36 _-__--_______ _-_- --_-- Signal cominq from touch key. When either one of D-10 line keys on key matrix is touched, a corresponding signal will be input into K6. 1 SIGNAL j K5 j IN...
  • Page 23 R-4A52 R-4E52 SERVICING Precautions Handing Electronic For those models, therefore, check and repair all the controls (with the sensor-related ones Components included) of the touch control panel while This unit uses PMOS LSI in the integral part of the keeping...

  • Page 24: Replacement And Adjustment

    R -4A52 R-4E52 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before oDerating the oven. Door does not close firmly. 1. CARRY OUT 3D CHECKS. 2. Door hinge, support or latch hook is damaged. 2.
  • Page 25 R-4A52 R-4E52 MAGNETRON REMOVAL 1. CARRY OUT 3D CHECKS 6. Remove the magnetron from the waveguide with 2. Disconnect the H.V. wire A and filament lead(longer care so the magnetron antenna should not hit by one) of the transformer from the magnetron.
  • Page 26 R-4A52 R-4E52 OVEN LAMP SOCKET REMOVAL Oven lamp socket CARRY OUT 3D CHECKS Lift up the tab holding the oven lamp socket. Remove the oven lamp socket. Pull the wire leads from the oven lamp socket Flat type screw dri...
  • Page 27 R -4A52 R-4E52 UPPER LATCH SWITCH, LOWER LATCH SWITCH, STOP SWITCH MONITOR SWITCH ADJUSTMENT 5. Reinstall outer case check microwave If the lower latch latch switch, stop switch, upper latch switch and monitor switch do not operate properly due leakage around the door with an approved micro-...

  • Page 28: Door Replacement

    R -4A52 R-4E52 DOOR REPLACEMENT ADJUSTMENT CHOKE COVER REMOVAL DOOR REPLACEMENT 1. CARRY OUT 3D CHECKS 1. Insert an iron plate(thrckness of about 0.5mm) 2. Remove screws holding the lower oven flat type screw driver to the gap between the choke hinge to the oven cavity.

  • Page 29: Power Supply Cord Replacement

    R-4A52 R-4E52 Tab of the door panel Figure C-8. Latch head removal Figure C-9. Latch head re-install LATCH HEAD RE-INSTALL 1. Pick up the latch spring and catch the one ring of 2. Catch the other ring of the latch spring...

  • Page 30: Power Supply Cord

    FL4A52 R-4E52 POWER SUPPLY CORD REPLACEMENT (FOR NEW ZEALAND MODEL) Removal CARRY OUT 3D CHECKS Loosen the two (2) screws holding the brown blue wires of the power supply cord to the cord connector on the noise filter. Loosen the single (1) screw holding the earth angle Cord connector Blue wire...
  • Page 31 R -4A52 R-4E52 MICROWAVE MEASUREMENT After adjustment door latch switches, monitor Recommended instruments are: switch and door are completed individually or collec- NARDA 8100 tively, the following leakage test must be performed NARDA 8200 with a survey instrument and it must be confirmed that HOLADAY HI 1500...

  • Page 32: Test Data At A Glance

    R-4A52 R-4E52 TEST DATA AT A GLANCE IP arts 1 Symbol 1 Value / Data I--- M8A 250V Fuse 0.8zT 20W Monitor resistor 150°C Temp. fuse (MG) 145°C Thermal cut-out (OVEN) 250V Oven lamp 1 .I 3pF AC 21 OOV...
  • Page 33 240V-50Hz 240V-+OHr FUSE CORD CONNECTION AC CORD CONNECTION BROWN BRN : BROWN BLUE BLU : BLUE GREEN GREEN AND STRIPE YELLOW YELLOW STRIPE SECTIONAL AREA SECTIONAL AREA 0.75mm2 OF 0.75mm2 MIN. swi: sw1: LfPPER UPPER LATCH LATCH SWITCi- SWITCH 5w2: >...
  • Page 34 240-6CiHz BLU/lB m/10 pg-, __~----_-_--_ LINE cR0ss CAPACITOR O.O68/‘(AC25OV F: FUSE NOISE SUPPRES;;“” COIL NOISE SVPPRESSION COIL NOISE LINE BYPASS FILTER AC CORD CONNECTION AC CORD CONNECTION BROWN BRN : BROWN BLU : -BLUE BLU : BLUE GREEN AND GREEN AND ----------------+--I YELLOW STRIPE YELLOW STRIPE...
  • Page 35 R -4A52 R-4E52 > mfxz i’ & 2 co crm3 r” 5 a- -H-Y [TIP l-01-c . . P Q 4 I 9 81 -II $3 EC . . iit v 5 .- ---~ ‘0...
  • Page 36 R -4A52 R-4E52 -____- liij 9 (I z” ii?% WI--Lo F&z > -I-- -luJ >-P ru U-d u Etu4Jal c-f+ c e--J o,culc z”...
  • Page 37 R -4A52 R-4E52 iz 3 1 c ii t p ’ 00 lE (Ij cd j ii 1 ’ .- LL PI Y El::: XS’B S.-r ZZZO 5’ 6L-‘c...
  • Page 38 R-4A52 R-4E52 i cd s .- > :: * 2 a z z 5 % z >!2, z c z ;: ; 3 ;p” :: -) :: c e c z z s I” CD” fZd.8 ‘PZ:! 8mn= “p:: EZBB “X...
  • Page 39 R -4A52 R-4E52 -w** “_ “” BFzoo--~“- :““*‘I “-.>i--. L -* ” .r - \ ^I * R64 is inserted on this position. __-- RY- I CN-A Figure S-4. Printed Wiring Board...

  • Page 40: Parts List

    R-4A52 R-4E52 PARTS LIST The voltage supplied to the parts “*rr are greater than 250V. Note : DESCRIPTION 1 my ICODE REF. NO. PART NO. ELECTRICAL PARTS QFS-TA014WREO TF: Temp. fuse 150°C (MG) QFSHDA002WREO Fuse holder (For Australian Model) l- 2...
  • Page 41 4-22 LBOS-A045WREO Waveguide stub 4-23 PGIDHA044WRPO Magnetron air guide 4-24 LANGQA167WRMO Earth angle' (For New Zealand Model) 4-25 LANGQA288WRPO Noise filter angle (For New Zealand Model) 4-26 PCUSU0158YBPO Cushion 4-27 PCUSGA305WRPO Oven cushion (R-4A52) 4-28 PCUSUA278WRPO MG cushion...
  • Page 42 DESCRIPTION 10’~~ ICODE REF. NO. PART NO. DOOR PARTS CDORFA464WRKO Door assembly, complete. (R-4E52) CDORFA467WRKO Door assembly, complete. (R-4A52) Door panel (R-4A52) FDORFA210WRTO 5- 1 Door panel (R-4E52) FDORFA204WRTO Choke cover 5- 2 GCOVHA233WRFO Latch head LSTPPA093WRFO 5- 3 MSPRTA114WREO...
  • Page 43 R -4A52 R-4E52 OVEN PARTS ‘. \ ----- ------- l-12...

  • Page 44: Control Panel Parts

    R -4A52 R-4E52 CONTROL PANEL PARTS (R-4A52) d \ / CONTROL PANEL PARTS (R-4E52)
  • Page 45 R -4A52 R-4E52 DOOR PARTS ,___________-______-------------------------------------------------~------. ,’ --._ ,,,’ --., _’ ,,** ,_** _,-- ,<-’ _,-- ,_,- ,’ ,’ ,/’ ,,*’ _/’ ,<I’ .’ ,/ _/ ,/’ ,/ ,* __*’ MISCELLANEOUS 240mm < >...

  • Page 46: Packing And Accessories

    R -4A52 R-4E52 PACKING ACCESSORIES PACKING ADD KIT FOR R-4E52 7:: (CPADBA 108WRKO) TRAY HOLDER __-_. tft(SPADFA208WREO) %(SPADFAOGlWREO) Tray pad : FOR R-4A52 AUSTRALIA %(SPAKCB567WREO) : FOR R-4A52 NEW ZEALAND ic(SPAKCB548WREO) : FOR R-4E52...
  • Page 47 R-4A52 R-4E52 SHARP ‘90 0 SHARP CORP. (lOK0.93E) Printed in Japan...

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R -4,e52R-4e52

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