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Sharp R-1900J Service Manual
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Sharp R-1900J Service Manual

Commercial microwave oven
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TopPage
In the interests of user-safety the oven should be restored to its original condition and only parts identical to those
specified should be used.
CHAPTER 1. BEFORE SERVICING
CHAPTER 2. WARNING TO SERVICE PERSONNEL
CHAPTER 3. PRODUCT DESCRIPTION
CHAPTER 4. OPERATION
CHAPTER 5. TROUBLESHOOTING GUIDE
CHAPTER 6. TEST PROCEDURES
CHAPTER 7. TOUCH CONTROL PANEL ASSEMBLY
CHAPTER 8. PRECAUTIONS FOR USING LEAD-
SERVICE MANUAL

MICROWAVE OVEN

MODEL
CONTENTS
FREE SOLDER
CHAPTER 9. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
CHAPTER 10. MICROWAVE MEASUREMENT
CHAPTER 11. CIRCUIT DIAGRAMS
Parts List
S6903R1900PJ/
COMMERCIAL
R-1900J
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
R1900J

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  • Page 1: Microwave Oven

    TopPage R1900J SERVICE MANUAL S6903R1900PJ/ COMMERCIAL MICROWAVE OVEN R-1900J MODEL In the interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. CONTENTS CHAPTER 1. BEFORE SERVICING FREE SOLDER CHAPTER 2.

  • Page 2: Table Of Contents

    CONTENTS CHAPTER 1. BEFORE SERVICING CHAPTER 8. PRECAUTIONS FOR USING LEAD- FREE SOLDER CHAPTER 2. WARNING TO SERVICE PERSON- CHAPTER 9. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CHAPTER 3. PRODUCT DESCRIPTION WARNINGS ..........9-1 SPECIFICATIONS ........3-1 OUTER CASE AND REAR COVER RE- APPEARANCE VIEW ......

  • Page 3: Chapter 1. Before Servicing

    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 ser- vice.

  • Page 4: Chapter 2. Warning To Service Personnel

    (timer at zero) carefully check that the water Sharp recommend that wherever possible fault-finding is carried out is now hot. If the water remains cold, carry out 3D checks and re- with the supply disconnected. It may, in some cases, be necessary to examine the connections to the component being tested.

  • Page 5: Chapter 3. Product Description

    R1900J CHAPTER 3. R1900J PRODUCT DESCRIPTION [1] SPECIFICATIONS ITEM DESCRIPTION Power Requirements Single phase 230 - 240V, 50Hz, 3 wire earthed Power Consumption 2.8kW Power Output 1900W Operating frequency 2450 MHz (IEC60705) Outside Dimensions 445mm (W) x 573mm (D) x 346mm (H) (including feet) Touch Control System Digital Display Ten number Pads...

  • Page 6: Installation Information

    R1900J 2. TOUCH CONTROL PANEL DOOR SIDE 7. Ten number pads 1. MANUAL/REPEAT pad 4. CUSTOM SETTING pad 8. EXPRESS DEFROST pad 2. POWER LEVEL pad 5. STOP/CLEAR pad 9. SET MEMORY pad 6. START pad 3. DOUBLE/TRIPLE QUANTITY pad [3] INSTALLATION INFORMATION When this commercial microwave oven is installed near other commercial electrical appliances, connect a lead wire to each equivalent potential ter- minal with equipotential marking between them (insert a lead wire between a washer and an earth angle, and screw them), as shown in Fig.

  • Page 7: Chapter 4. Operation

    R1900J CHAPTER 4. R1900J OPERATION [1] DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. OFF CONDITION 1) When the door opens from a closed position, the contacts of the primary interlock relay RY1 and the contacts (COM-NO) of sec- 1.

  • Page 8: Description And Function Of Components

    R1900J [2] DESCRIPTION AND FUNCTION OF COMPONENTS 1. DOOR OPEN MECHANISM 2. As the door goes to a closed position, the contacts of the monitor switches (1), (2) are opened first, then the contacts of the door 1. The handle lever is pulled. sensing switch and the secondary interlock switches (1), (2) close.
  • Page 9 R1900J 10. FAN MOTORS 1. The high voltage rectifier is shorted by some fault when microwave cooking or dual cooking. The fan motors drive blades which draw external cool air into the oven. 2. The peak reverse voltage of D2 of the rectifier goes beyond the This cool air is directed through the air vanes surrounding the magne- rated peak reverse voltage 1.7 KV in the voltage doubler circuit.

  • Page 10: Chapter 5. Troubleshooting Guide

    R1900J CHAPTER 5. R1900J TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected. When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed.

  • Page 11: Test Procedures

    R1900J SPECIFICATION OF ERROR Outline Operation when error occurs Display in operation usually When a basic performance and the function are ruined Displaying and heating stop EE0, EE1, EE2, EE3, EE8 When the dangers of the state of the high temperature and the ignition, etc. are Displaying and heating stop foreseen When you mistake the setting of the heating time...

  • Page 12: Chapter 6. Test Procedures A: Magnetron Test

    R1900J CHAPTER 6. R1900J TEST PROCEDURES [1] A: MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPER- ATION. SERVICE INFORMATION IMPORTANT: When the magnetron MG1 and/or MG2 is replacing, the relays (RY3 and RY4) on control unit must be replaced at the same time.

  • Page 13: B: Power Transformer Test

    R1900J Room temperature ..............To = 21°C Initial temperature ..............T1 = 11°C Temperature after (22 + 3) = 25 sec........... T2 = 21°C Temperature difference Cold-Warm ........T1 = 10°C Measured output power The equation is “P = 190 x T"...

  • Page 14: D: High Voltage Capacitor (1) And/Or (2) Test

    R1900J [4] D: HIGH VOLTAGE CAPACITOR (1) AND/OR (2) TEST 1. CARRY OUT 3D CHECKS. 2. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open between the termi- nals using an ohmmeter.

  • Page 15: I: Weak Point

    R1900J [9] I: WEAK POINT (FOR FAN MOTOR) TEST CARRY OUT 3D CHECKS. If the weak point is blown, the fan motor or exhaust fan could be locked or there could be a shorts in the fan motor or exhaust fan. Check them and replace the defective parts.

  • Page 16: N: Noise Filter Test

    R1900J [14] N: NOISE FILTER TEST Source 1. CARRY OUT 3D CHECKS. Source (Blue) (Brown) NOISE FILTER 2. Disconnect the lead wires from the terminal the noise filter. Using an ohmmeter, check between DISCHARGE RESISTOR the terminals as described in the following table. If incorrect reading are obtained, replace the 470K 1/2W noise filter.

  • Page 17: P: Control Unit Test

    R1900J [16] P: CONTROL UNIT TEST The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key units test (Procedure O) to determine if control unit is faulty. Connect the power supply cord. And check for followings. 1.

  • Page 18: S: Antenna Sensor Test

    R1900J [19] S: ANTENNA SENSOR TEST There is no test procedure for the antenna sensor. When the error history display shows EE15, EE25 or EE35, if the antenna motors, control unit and wiring are normal, the antenna sensor may be defective.

  • Page 19: Touch Control Panel Assembly

    R1900J CHAPTER 7. R1900J TOUCH CONTROL PANEL ASSEMBLY [1] SPECIAL FUNCTION FOR SERVICING This oven has the special functions for servicing as shown in the table 1 ~ 4. By using the special function, service person can check the using time or the using number of times for the electrical parts. Also service person can check the AC supply voltage and /or set the standard voltage.
  • Page 20 R1900J For example: Procedure to check the total cooking number of times (example, 957700 times) and using time (example, 1260 hours) of MG 1 and set 0 hours after MG1 is replaced. : no sound : 0.1 second sound : 2.0 second sound : (0.06 sec.
  • Page 21 R1900J 2. Error history (SF-4) For example: Procedure to check current voltage (In case of under 230V) You can check the most recent 10 error histories. Operation Display Indicator Sound For example: Procedure to check the error histories that have been memorized in memory 1, memory 2 and memory 9.
  • Page 22 R1900J 4. Exhaust thermistor check (SF-6) You can check if the exhaust thermistor works correctly or not by using this function. For example: In case the exhaust thermistor works correctly (275ml water load is necessary.), the display will show “OH” as follows. Operation Display Indicator...
  • Page 23 R1900J 5. Set of standard voltage (SF-7) When the control unit or the relay unit is replaced, set the standard voltage, referring to following procedure. Because the control unit judges if the AC supply voltage is 240V+10% or 230V-12% by comparing with the standard voltage. The temporary standard voltage is set when the oven is shipped from the factory.
  • Page 24 Procedure to check the model name and making date of software. Operation Display Indicator Sound plug in (within 20 sec.) POWER LEVEL SET MEMORY (within 20 sec.) START STOP/CLEAR CUSTOM c19J (model name) (date) XXXX (time) XXXX STOP/CLEAR #1: “c19J” means model R-1900J. 7 – 6...

  • Page 25: Servicing For Brinted Wiring Boards

    R1900J [2] SERVICING FOR BRINTED WIRING BOARDS 1. Precautions for Handling Electronic Components b) On some models, the power supply cord between the printed wiring boards and the oven proper is long enough that they This unit uses CMOS LSI in the integral part of the circuits. When han- may be separated from each other.

  • Page 26: Chapter 8. Precautions For Using Lead-Free Solder

    R1900J CHAPTER 8. R1900J PRECAUTIONS FOR USING LEAD-FREE SOLDER Employing lead-free solder The “Main PWB” of this model employs lead-free solder. This is indicated by the “LF” symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder. Example: Indicates lead-free solder of tin, silver and copper Using lead-free wire solder...

  • Page 27: Chapter 9. Component Replacement And Adjustment Procedure Warnings

    4. If the outer case (cabinet) is not fitted. WARNING FOR WIRING To prevent an electric shock, take the following precau- Oven cavity. tions. 3) Sharp edge: 1. Before wiring, Bottom plate, Oven cavity, Waveguide flange Chassis 1) Disconnect the power supply cord. support and other metallic plate.

  • Page 28: Power Transformers (1) And/Or (2) Removal

    R1900J 10.Remove the six (6) screws holding the rear cover and exhaust 12.Now, the rear cover with the fan motor and exhaust cover is free. cover to the bottom plate, power supply cord angle, intake duct and NOTE: Do not forget to re-connect the wire leads to the exhaust fan exhaust duct.

  • Page 29: Power Supply Cord Replacement

    R1900J 6. Remove the capacitor band from the high voltage capacitor. 2) DO NOT REPLACE ONLY THE HIGH VOLTAGE REC- TIFIER. IF IT IS DEFECTIVE, REPLACE THE HIGH 7. Disconnect all wire leads from the high voltage capacitor. VOLTAGE RECTIFIER ASSEMBLY. 8.

  • Page 30: Fan Motors Removal

    R1900J [10] FAN MOTORS REMOVAL 1. CARRY OUT 3D CHECKS. 2. Remove the rear cover. 5. Release the wire leads of the fan motor from the wire holder. 3. Disconnect the connector of the fan motor from the connector of 6.

  • Page 31: Door Sensing Switch/ Secondary Interlock Switches (1), (2) And Monitor Switches (1), (2) Replacement

    R1900J NOTE: When the relay unit is replaced, set the standard voltage refer- ring to Special Function pages. [15] DOOR SENSING SWITCH/ SECONDARY INTERLOCK SWITCHES (1), (2) AND MONITOR SWITCHES (1), (2) REPLACEMENT 1. REMOVAL Mount the door sensing switch in the lower position of latch hook. MONITOR SWITCHES 1.

  • Page 32: Door Disassembly

    R1900J 5. Release upper and lower hinges and the hinge cover from door 2. Deviation of the door alignment from horizontal line of cavity face assembly. plate is to be less than 1.0mm. 6. Now, door assembly is free. 3. The door is positioned with its face depressed toward the cavity face plate.
  • Page 33 R1900J 3. KEY UNIT (IN DOOR ASSEMBLY) REMOVAL 7. UPPER AND LOWER LATCH HEADS REMOVAL After removing door panel; After removing door panel; 1. Remove the five (5) screws holding the key fixing plate to the door 1. Remove the latch spring from the latch angle assembly and the frame.

  • Page 34: Oven Lamp And Lamp Socket Removal

    R1900J [19] OVEN LAMP AND LAMP SOCKET REMOVAL 1. CARRY OUT 3D CHECKS. Oven lamp 2. Remove the oven lamp. socket 3. By pushing the tab, remove the lamp spacer with the lamp socket from the lamp angle assembly. Terminal 4.

  • Page 35: Chapter 10. Microwave Measurement

    R1900J CHAPTER 10. R1900J MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch and door are completed individually or collectively, the following leakage test must be per- formed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for microwave oven. REQUIREMENT The safety switch must prevent microwave radiation emission in excess of 5mW/cm at any point 5cm or more from external surface of the oven.

  • Page 36: Oven Schematic

    R1900J CHAPTER 11. R1900J CIRCUIT DIAGRAMS [1] Oven Schematic SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. PLUGGED IN OVEN. 3. NOTHING APPEAR ON DISPLAY. POWER TRANSFORMER (1) PRIMARY COOK MAGNETRON INTERLOCK RELAY (1) WEAK POINT (1) LINE TEMP. FUSE (1) RELAY H.
  • Page 37 R1900J SCHEMATIC NOTE: CONDITION OF OVEN 6. DOOR CLOSED. 7. “0” APPEAR ON DISPLAY. NOTE: The relay RY4 will open if the oven is not operated for 3 minutes or more. And the oven condition will go back to one of Figure O-1(a). POWER TRANSFORMER (1) PRIMARY...
  • Page 38 R1900J [2] Figure S-1. Pictorial Diagram Magnetron temp.fuse (1) White High voltage capacitor (2) Wire holder MG1: Magnetron Magnetron thermistor (1) White CPU harness Blue High voltage (Blue case) capacitor (1) Red (Red case) Magnetron thermistor (2) Crosstape Magnetron (2) Gray Power transformer (1) Crosstape...
  • Page 39 R1900J High voltage High voltage rectifier (1) capacitor (1) Magnetron Monitor switch Asymmetric rectifier (1) Power transformer (1) Monitor High voltage Blue (Blue case) switch capacitor (2) White (Blue case) Secondary Brown interlock switch Gray High voltage rectifier (2) Main wire Gray/Red harness Asymmetric rectifier (2)
  • Page 40 R1900J NOTE: The red and blue wire leads to the cabinet side terminals of Main wire harness RY2 and RY3 should go through inside the core of CT1 3 WHT Cook relay (1) Main wire Cook relay (2) harness Primary interlock relay RY1 Main wire harness DC harness 12...

  • Page 41: Figure S-2. Switching Power Supply Unit Circuit

    R1900J [3] Figure S-2. Switching Power Supply Unit Circuit ZD21 11 – 6...

  • Page 42: Figure S-3. Relay Unit Circuit

    R1900J [4] Figure S-3. Relay Unit Circuit NOTE: IF NOT SPECIFIED : 1/4W J% : 1SS133 RTRNPA162DR : NOT INSERT PARTS CN-D 1N4002x4 : CHECK POINT D292 D291 VRS1 S10K300 D294 D293 CN-A V-SENS D-12 GND-1 O.L. PCJ-124D3M CN-E 24V-2 24V 2 24V-1 SW POWER...

  • Page 43: Sor/ Microwave Sensor Circuit

    R1900J [5] Figure S-4. Control Unit/ Antenna sensor/ Microwave Sensor Circuit R141 11 – 8...

  • Page 44: Figure S-5. Printed Wiring Board

    R1900J [6] Figure S-5. Printed Wiring Board CONTROL UNIT ANTENNA SENSOR SWITCH UNIT RELAY UNIT MICROWAVE SENSOR SWITCHING POWER SUPPLY UNIT 11 – 9...

  • Page 45: Parts List

    PARTS LIST COMMERCIAL MICROWAVE OVEN HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly, please furnish the following information. R-1900J 1. MODEL NUMBER MODEL 2. REF. NO. 3. PART NO. 4. DESCRIPTION Parts marked "*" may cause undue microwave exposure.
  • Page 46 R1900J [1] OVEN PARTS 7-21 4-64 6-14 7-31 1-17-1 4-74 2-2-2 4-63 4-48 4-34 4-12 7-21 2-2-1 7-21 7-21 7-25 7-28 6-18 7-13 4-10 4-63 1-13 7-21 4-48 7-28 2-2-3 4-60 Vinyl insulation tape: 7-21 7-21 20mm (W) x 520mm (L) 7-28 Please get the vinyl insulation 2-10...
  • Page 47 R1900J PRICE PART PARTS CODE DESCRIPTION RANK MARK RANK [1] OVEN PARTS ELECTRIC PARTS Sensor assembly (Exhaust thermistor) FDTCTA239WRKZ Relay Unit DPWB-A568DRKZ Power Unit (Switching Power Sipply Unit) DPWB-A565DRKZ Sensing SW (Antenna sensor) DPWB-A571DRKZ Power Supply Cord FACCLA005WRKZ Noise Filter FPWBFA445WRKZ Sensor assembly (Microwave Sensor) DPWB-A570DRKZ...
  • Page 48 R1900J PRICE PART PARTS CODE DESCRIPTION RANK MARK RANK [1] OVEN PARTS 4-37 Motor Fixing Angle LANGQA702WRPZ 4-38 Face Support Angle LSUB-A137WRPZ 4-39 Lower Hinge MHNG-A592WRPZ 4-40 Stirrer Shaft NSFTPA045WRFZ 4-41 Clip L PCLIC0018WRE0 4-42 PCOVPA480WRFZ Hinge Cover 4-43 Sensor Cover PCOVPA496WRFZ 4-44 Lamp Filter...
  • Page 49 R1900J [2] DOOR AND CONTROL PANEL PARTS 3-12 3-12 3-10 3-11 5-34 5-20 5-17 5-28 5-18 5-3-2 5-34 5-18 5-3-1 5-17 5-19 5-21 5-33 5-14 5-30 5-25 5-26 5-31 5-29 5-11 5-27 5-32 5-10 5-13 5-24 5-16 5-15 5-12 5-16 5-11 5-35 5-32...
  • Page 50 R1900J PRICE PART PARTS CODE DESCRIPTION RANK MARK RANK [2] DOOR AND CONTROL PANEL PARTS CONTROL PANEL PARTS Control Unit DPWB-A782DRKZ Key Unit FUNTKB185WREZ Display Window GMADIA189WRFZ Panel Grill GWAKPB142WRFZ Panel Cap R HDECQA372WRMZ Panel Cap L HDECQA373WRMZ Panel Fixed Plate LANGQA676WRWZ Cp Cushion A PCUSGA753WRPZ...
  • Page 51 R1900J INDEX PRICE PART PRICE PART PARTS CODE PARTS CODE RANK MARK RANK RANK MARK RANK LHLDWA013WRE0 2-6-3 [ C ] LHLDWA063WREZ 1-6-11 CDORFB148WRKZ LRTNPA001DRZZ 2-5-30 [ D ] LRTNPA002DRZZ 2-5-31 DDAI-A217WRKZ 1-2-1 LSTPPA261WRFZ 2-5-5 DDUC-A071WRKZ 1-4-2 LSTPPA288WRMZ 2-5-11 DDUC-A072WRKZ 1-4-17 LSUB-A137WRPZ 1-4-38...
  • Page 52 R1900J PRICE PART PARTS CODE RANK MARK RANK PREFHA089WRPZ 1-2-2-3 PSHEGA011WREZ 1-2-6 PSHEPB323WREZ 1-4-69 PSHEPB325WREZ 2-5-21 PSHEPB332WREZ 2-3-10 PSHEPB353WREZ 1-4-29 PSHEPB455WREZ 1-4-74 PSKR-A462WRPZ 1-4-47 PSKR-A464WRPZ 1-4-55 PSKR-A500WRPZ 1-4-73 PSPASA027WRFZ 1-4-72 [ Q ] QFS-CA032WRZZ 1-1-15 QFSHDA019WRE0 1-1-9 QFS-TA014WRE0 1-1-24 QFS-TA015WRE0 1-1-25 QSOCLA024WRE0 1-1-8...

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