Dacor DCM24B Service Manual
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Dacor DCM24B Service Manual

Dcm convection microwave oven
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Summary of Contents for Dacor DCM24B

  • Page 1 DCM Convection Microwave Parts and Service Manual...

  • Page 2: Table Of Contents

    DCM24B DCM24R DCM24S SERVICE MANUAL CONVECTION MICROWAVE OVEN DCM24B MODELS DCM24R DCM24S In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock.

  • Page 3: Precautions To Be Observed Before And During Service To Avoid Possible Exposure To Excessive Microwave Energy

    DCM24B DCM24R DCM24S PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPO- SURE 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...

  • Page 4: Warning To Service Personnel

    DCM24B DCM24R DCM24S WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harness etc..

  • Page 5: Microwave Measurement Procedure

    DCM24B DCM24R DCM24S MICROWAVE MEASUREMENT PROCEDURE A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition...

  • Page 6: Foreword And Warning

    This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the OPERATION MICROWAVE OVEN, DCM24B, DCM24R, DCM24S. It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service.

  • Page 7: Product Specifications

    DCM24B DCM24R DCM24S SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts 13.0 Amperes (Microwave) / 13.0 Amperes (Convection) 60 Hertz / Single phase, 3 wire grounded Power Output 900 watts (IEC Test Procedure) Operating frequency of 2450MHz Convection Power Output 1450 Watts Case Dimensions Width 24-5/8"...

  • Page 8: Oven Diagram

    DCM24B DCM24R DCM24S that a separate circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances. Grounded Receptacle Box A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord.

  • Page 9: Operation

    DCM24B DCM24R DCM24S OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during cooling fan motor, and the high voltage components are oven operation. de-energized, the oven lamp remains on, and the digital read-out displays the time still remaining in the cook OFF CONDITION cycle when the door was opened.
  • Page 10 DCM24B DCM24R DCM24S damper switch contacts. The opening of the damper The damper door is closed from the open position. switch contacts sends a signal to the LSI on the control 4. The heater relay (RY3) is energized, applying the main unit de-energizing the relay (RY4) and opening the supply voltage to the heating element.
  • Page 11 DCM24B DCM24R DCM24S 2. Heat potatoes. Moisture and will go to the off condition. The cooling fan will remain on humidity is emitted rapidly. until the oven has cooled. You can smell the aroma as it AUTO DEFROST COOKING cooks.

  • Page 12: Schematic Diagram

    DCM24B DCM24R DCM24S SCHEMATIC DIAGRAM SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: " " indicates components with potentials above 250V. MAGNETRON CONV. TEMPERATURE THERMAL FUSE CUT-OUT FUSE COM. POWER TRANSFORMER (RY1) N.O. (RY1) CAPACITOR COM.

  • Page 13: Description And Function Of Components

    DCM24B DCM24R DCM24S SCHEMATIC NOTE: " " indicates components with potentials above 250V. 1. DOOR CLOSED. 2. MIX COOKING PAD TOUCHED. 3. COOKING TIME PROGRAMMED. 4. “START” PAD TOUCHED. MAGNETRON CONV. 5. RY2 AND RY3 WILL ALTERNATELY CLOSE. TEMPERATURE THERMAL FUSE DURING COOK CYCLE.
  • Page 14 DCM24B DCM24R DCM24S all components. A cook cycle cannot take place until the door failure, obstructed air guide, dirty or blocked air intake, etc. is firmly closed thereby activating both interlock switches. The Under normal operation, the temperature fuse remains primary interlock system consists of the door sensing switch closed.

  • Page 15: Troubleshooting Guide

    DCM24B DCM24R DCM24S Convection Cooking: 3-3. The damper is held in the closed position during the Damper is in the closed position, so that no hot air will be convection cooking operation. allowed to leak out the oven cavity. 3-4. At the end of the convection cooking, shut-off relay...
  • Page 16 DCM24B DCM24R DCM24S (SENSOR CONDITION OFF CONDITION COOKING CONDITION (MICROWAVE) (CONVECTION) COOKING) POSSIBLE CAUSE DEFECTIVE PARTS MAGNETRON POWER TRANSFORMER H.V. RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR SECONDARY INTERLOCK SWITCH PRIMARY INTERLOCK SYSTEM MONITOR SWITCH MONITOR FUSE MAGNETRON TEMPERATURE FUSE CONV. THERMAL CUT-OUT...

  • Page 17: Test Procedure

    DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.
  • Page 18 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MEASURE THE FILAMENT AND HIGH VOLTAGE.) HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor.
  • Page 19 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the turntable motor and oven light will be activated by RY1.
  • Page 20 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions.
  • Page 21 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER THERMISTOR TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect connector-E from the control unit. Measure the resistance of the thermistor with an ohmmeter.
  • Page 22 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 12.Re-install the outer case (cabinet). 13.Reconnect the power supply cord after the outer case is installed. 14.Run the oven and check all functions. CHECKING TEMPERATURE IN THE CONVECTION MODE The following test procedure should be carried out with the microwave oven is a fully assembled condition (outer case fitted).
  • Page 23 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 2-1 In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal. 2-2 In connection with indicators a) At a certain digit, all or some segments do not light up.
  • Page 24 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the leads to the primary of the power transformer.
  • Page 25 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 4) Follow the troubleshooting guide given below for repair. STEPS OCCURRENCE CAUSE OR CORRECTION Only pattern at "a" is broken. *Insert jumper wire J1 and solder. Pattern at "a" and "b" are broken.
  • Page 26 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture with a dry cloth or paper towel. (6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be at refrigerator temperature and canned soup at room temperature.
  • Page 27 DCM24B DCM24R DCM24S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 9-3. After approximately 20 seconds, push plunger of select switch for more than 3 seconds. This condition is same as judgement by AH sensor. 9-4. After approximately 3 seconds, the display shows “ X X . X X “ which is the remaining cooking time, and the display count down.

  • Page 28: Touch Control Panel

    DCM24B DCM24R DCM24S TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units 4) ACL Circuit as shown in the touch control panel circuit. A circuit to generate a signals which resetting the LSI to the initial state when power is applied.
  • Page 29 DCM24B DCM24R DCM24S Pin No. Signal Description Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI.
  • Page 30 DCM24B DCM24R DCM24S Pin No. Signal Description Damper motor relay driving signal. H : GND To turn on and off shut-off relay(RY4). Heating element driving signal. To turn on and off shut-off relay(RY3). "L" level during convection cooking; "H" level otherwise. Dur-...
  • Page 31 DCM24B DCM24R DCM24S Pin No. Signal Description Segment data signals. The relation between signals and indicators are as follows: Signal Segment Signal Segment Signal Segment Signal Segment P23 ..... P1 P17 ..... P5 P13 ..... P9 P07 ... P13 P22 ..... P2 P16 .....
  • Page 32 DCM24B DCM24R DCM24S ABSOLUTE HUMIDITY SENSOR CIRCUIT compares it with its initial value, and when the comparison (1) Structure of Absolute Humidity Sensor rate reaches the preset value (fixed for each menu to be The absolute humidity sensor includes two thermistors cooked), the LSI causes the unit to stop sensor cooking;...
  • Page 33 DCM24B DCM24R DCM24S TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components 5) Re-connect the power supply cord after the outer case is This unit uses CMOS LSI in the integral part of the circuits. installed. When handling these parts, the following precautions should 6) Run the oven and check all functions.

  • Page 34: Component Replacement And Adjustment Procedure

    DCM24B DCM24R DCM24S COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
  • Page 35 DCM24B DCM24R DCM24S CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CA- PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same Special screw locations.
  • Page 36 DCM24B DCM24R DCM24S 7. Remove one (1) screw and washer holding the rectifier the rear cabinet. from the capacitor holder. 9. Remove the capacitor from the holder. 8. Remove one (1) screw holding the capacitor holder to ® POSITIVE LOCK...
  • Page 37 DCM24B DCM24R DCM24S HEATER UNIT ASSEMBLY REMOVAL (HEATING ELEMENT/CONVECTION FAN/CONVECTION MOTOR/THERMISTOR) THERMISTOR REMOVAL HEATING ELEMENT REMOVAL 1. Disconnect the power supply cord and then remove 10.Remove two (2) screws holding heating element to outer case. heater duct. 2. Open the oven door and block it open.
  • Page 38 DCM24B DCM24R DCM24S 17.Hold the edge of the rotor of the fan motor by using a pair 3. Hold the center of the bracket which supports the shaft of grove joint pliers. of the fan motor on the flat table.
  • Page 39 DCM24B DCM24R DCM24S 6. Secure the screws with washers firmly. After adjustment, check the following. DOOR SENSING 1. In and out play of door remains less than 0.5mm at the SWITCH latched position. 2. The door sensing switch and secondary interlock switch MONITOR FUSE interrupt the circuit before the door can be opened.

  • Page 40: Door Disassembly

    DCM24B DCM24R DCM24S DOOR DISASSEMBLY DOOR PANEL Remove door assembly, refer to "Door Replacement". 5. Remove the eleven (11) screws holding the door panel Replacement of door components are as follows: to the door frame. CHOKE COVER NOTE: The one (1) screw of the twelve eleven (11) screws 1.

  • Page 41: Pictorial Diagram

    DCM24B DCM24R DCM24S...

  • Page 42: Control Panel Circuit

    DCM24B DCM24R DCM24S...

  • Page 43: Printed Wiring Board

    Technical Service 950 S. Raymond Ave Pasadena, CA 91105 800-353-2267...

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