Sharp SMO1854DS Service Manual
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Sharp SMO1854DS Service Manual

Sharp SMO1854DS Service Manual

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S/M No. : SMO1854DS001
Service Manual
Microwave Oven
Model: SMO1854DS
Caution
: This document has been published to be used for after sales
service only.
The contents are subject to change without notice.
DEC. 2018

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Questions and answers

Patty Thomas
March 15, 2025

Microwave says LOC in window

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1 comments:
Mr. Anderson
May 14, 2025

The meaning of "LOC" on the Sharp SMO1854DS microwave is not provided in the given context.

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Patty thomas
March 15, 2025

LOC control in window how do I rest controls

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Summary of Contents for Sharp SMO1854DS

  • Page 1 Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Model: SMO1854DS Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven Microwave Oven...

  • Page 2: Table Of Contents

    PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other micro- wave source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches, (5) Evidence of dropping or abuse.

  • Page 3: Proper Use And Service Precautions

    PROPER USE AND SERVICE PRECAUTIONS CAUTION This device is to be Serviced only by Properly Qualified Service Personnel. Consult the Service Manual for Proper Service Procedures to Assure Continued Safe Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy. 1.

  • Page 4: Specifications

    SPECIFICATIONS POWER SUPPLY 120V AC, 14.7 AMPS, 60Hz SINGLE PHASE WITH GROUNDING INPUT POWER 1700 W MICROWAVE ENERGY OUTPUT 1100 W FREQUENCY 2,450MHz OUTSIDE DIMENSIONS (W x H x D) 29.9 x 16.3 x 15.9 in CAVITY DIMENSIONS (W x H x D) 20.6 x 10.0 x 14.9 in CAVITY VOLUME 1.8 cu.ft...

  • Page 5: Features Diagram

    2. FEATURES DIAGRAM 1 DOOR LATCHES 9 DOOR BUTTON - To open the door push the door open button. 2 WINDOW with METAL SHIELD - Screen allows cooking to be viewed while keeping microwaves 0 COOKTOP LIGHT confined in oven. q GREASE FILTERS 3 MODEL NUMBER PLATE - Located on the front w HANDLE FILTERS - Use to insert Grease Filters.

  • Page 6: Control Panel

    3. CONTROL PANEL The Touch Control Panel allows you to set the oven controls with the press of a finger. It’s designed to be easy to use and understand. ◆ Each time a pad is pressed, a BEEP will sound. ◆...
  • Page 7 1 DISPLAY - Displays time of day, time or power level r POWER LEVEL - Press this pad if you want to being used, cooking mode and instructions. change from automatic Power Level 10 (High) for cooking. 2 FROZEN ENTREE - Press this pad to cook Frozen Entree.

  • Page 8: Installation

    INSTALLATION 1. Safety Instructions This product requires a three prong grounded receptacle. The installer must perform a ground continuity check on the power outlet box before beginning the installation to insure that the outlet box is properly grounded. If not properly grounded, or if the outlet box does not meet the electrical requirements noted, (under ELECTRICAL REQUIREMENTS), a qualified electrician should be employed to correct any deficiencies.

  • Page 9: Operations And Functions

    OPERATIONS AND FUNCTIONS This section includes useful information about oven operation. 1. Plug power supply cord into a standard 3-pronged 14.7 Amps 120V AC 60Hz power outlet. 2. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray and roller guide must always be in place during cooking.

  • Page 10: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY Cautions to be observed when troubleshooting. Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit. You are asked to observe the following precautions carefully.
  • Page 11 1. To remove cabinet and plate *b assembly 1) Remove the microwave oven from its mounting location and set it on a protected (padded) work surface. 2) Remove the 3 screws from the top of the microwave oven that secure the vent grille to the oven, and pull the top of the vent grille out so the tabs are from their slots, and remove it.
  • Page 12 4) Replace with 1.0-watt LED light available from your authorized dealer and secure with screw. You can purchase LED cooktop light from 1-800-BE-SHARP. 5) Reverse the above steps for reassembly. 4. Replace oven light When replacing the internal oven light, make sure you allow oven light to cool down and wear gloves to avoid injury from the heat of the lamp.
  • Page 13 5. To remove control panel assembly and PCB 1) Unplug the oven or turn off the power at the main power supply. 2) Remove the vent grille mounting 3 screws and open the door. 3) Slide the grille air to the left, then pull it straight out. 4) Remove a screw secured to the control panel assembly.
  • Page 14 6. To remove guide wind parts. PART CODE PART NAME Q'TY REMARK 9KC7121402511 SCREW TAPPING 9KC3963822200 MOTOR SHADED POLE 9KC35125-0024100 GUIDE WIND 9KC3511800100 9KC3518608000 NOISE-FILTER 9KC7S312X40A1 SCREW SPECIAL 1) Remove 3 screws for grounding and for fixing to Oven cavity. 2) Remove the noise filter from the guide wind.
  • Page 15 7. To remove high voltage capacitor. 1) Remove the screw which secure the grounding ring terminal of the H.V. diode and the capacitor holder. 2) Remove the H.V. diode from the capacitor holder. 3) Reverse the above steps for reassembly.  High voltage circuit wiring 8.
  • Page 16 9. To remove wind guide assembly. 1) Remove the screw for grounding. 2) Remove the noise filter from the wind guide. 3) Remove the screw which secure the wind guide assembly. 4) Draw forward the wind guide assembly. 5) Pull the fan from the motor shaft. 6) Remove two screws which secure the motor shaded pole.

  • Page 17: Interlock Mechanism And Adjustment

    INTERLOCK MECHANISM AND ADJUSTMENT The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave. DOOR CLOSED DOOR OPEN (1) Primary interlock switch...

  • Page 18: Troubleshooting Guide

    TROUBLESHOOTING GUIDE Following the procedures below to check if the oven is defective or not. 1. Check grounding before trouble checking. 2. Be careful of the high voltage circuit. 3. Discharge the high voltage capacitor. 4. When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed.
  • Page 19 CONDITION CHECK RESULT CAUSE REMEDY Replace Defective Outlet has Check continuity of magnetron magnetron Continuity proper voltage Fuse does not blow. Replace Open power Check continuity of supply cord power supply cord Continuity Normal Replace Defective touch control circuit Replace Display do not indicate Malfunction of secondary...
  • Page 20 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Continuity Replace Check continuity of high Defective high microwave voltage capacitor terminals voltage oscillation with wires removed transformer Replace Check continuity of high voltage Continuity in Defective high rectifier in forward and backward backward...
  • Page 21 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit 1. Incomplete segments, 1) Segments missing. 2) Partical segments missing. 3) Digit flickering other than normal display slight flickering. 4) " :0" does not display when power is on. 2.

  • Page 22: Measurement And Test

    MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below. PROCEDURE 1. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 0.12", an external diameter of approximately 7.48"...

  • Page 23: Microwave Radiation Test

    2. MICROWAVE RADIATION TEST CAUTION : 1. Make sure to check the microwave leakage before and after repair of adjustment. 2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. 3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. 4.

  • Page 24: Component Test Procedure

    3. COMPONENT TEST PROCEDURE • High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. • It is neither necessary nor advisable to attempt measurement of the high voltage. • Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor.

  • Page 25: Wiring Diagram

    WIRING DIAGRAM...

  • Page 26: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1. Voltage Check - Key check point CHECK POINT REMARK IC1 PIN 5 5VDC IC1 PIN 8 T : 16.67ms(60Hz) IC1 PIN 35 OR PIN 36 T : 250ns(4MHz) - Check method MEASURE POINT WAVE FORM REMEDY REMARK...
  • Page 28 3. When there is no microwave oscillation 1) When pressing START pad, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. RY11 HOOD_LAMP 1N4148 PCJ-112D3M DOM_IN KRC246S 1N4148 HOOD_LAMP_2 RY10 KRC246S PCJ-112D3M CON_YW396-11AV_7P KRC246S...

  • Page 29: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 30: Component No

    3. PCB COMPONENT NO. PART NAME SYMBOL PART CODE SPECIFICATION Q'TY LED DISPLAY 9KC40D05-0033700 DGD-D5812B-21 BUZZER 9KC3515600100 BM-20K (BUJEON) DIODE 9KCDD4SB80--- D4SB80 (7100) C CHIP CERA C1-2 C7-10 C12-14 C16-19 9KCHCFK104ZCB Y5V 50V 0.1MF Z 2012 C CERA 9KCCCXF3B102K 1KV 1000PF C CHIP CERA C20 C23 9KCHCBH104KCA...
  • Page 31 PCB COMPONENT NO. PART NAME SYMBOL PART CODE SPECIFICATION Q'TY R CHIP 9KC40H08-0043900 1/10W 357K 2012, 1% R CHIP R46-47 9KC40H08-0044500 1/10W 200 2012, J R CHIP R9 R49 R25 9KCHRFT473JCB 1/10W 47K OHM J 2012 R CHIP 9KC40H08-0044100 1/10W 301K 2012, 1% R CHIP 9KC40H08-0042900 1/10W 150K 2012, 1% R CHIP...

  • Page 32: Exploded View And Parts List

    EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly. 3. GUIDE WIND ASSEMBLY Refer to Disassembly and assembly. 4. TOTAL ASSEMBLY...
  • Page 33 PART CODE PART NAME Q'TY REMARK 9KC35117-0052000 DOOR AS 9KC35167-0111900 CONTROL-PANEL AS 9KC7122401211 SCREW TAPPING 9KC35161-0026700 CAVITY AS 9KC35114-0013000 COVER LAMP 9KC7122401211 SCREW TAPPING 9KC3511416700 COVER WAVE GUIDE 9KC4414H50000 FIXTURE AS 9KC3966820200 MOTOR SYNCRO 9KC7121400611 SCREW TAPPING 9KC3517400620 COUPLER 9KC35125-0009101 GUIDE TRAY RACK 9KC65127-0026200 HARNESS MAIN...
  • Page 34 PART CODE PART NAME Q'TY REMARK 9KC3518901400 THERMOSTAT 9KC7121300611 SCREW TAPPING 9KC35125-0024100 GUIDE WIND 9KC3963822200 MOTOR SHADED POLE 9KC7121402511 SCREW TAPPING COOLING BLADE 9KC3511800100 9KC3518608000 NOISE-FILTER 9KC7S312X40A1 SCREW SPECIAL 9KC7122401211 SCREW TAPPING 9KC35125-0024200 GUIDE AIR OUTLET *U 9KC35125-0023900 GUIDE AIR *T 9KC65189-0007200 THERMOSTAT 9KC65136-0001500...
  • Page 35 SHARP ELECTRONICS CORPORATION 100 Paragon Drive, Montvale, NJ07645 S/M NO. : SMO1854DS001 PRINTED DATE: DEC. 2018...

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