Dacor PMOR3021B Service Manual
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Dacor PMOR3021B Service Manual

Over the range microwave oven
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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 the following parts may result in a severe, possibly fatal, electrical shock. (Inverter unit
that includes High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectifier and Heat sink etc.,
and Magnetron, High Voltage Harness etc..)
BEFORE SERVICING .................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL .............................................................................................................. 1
MICROWAVE MEASUREMENT PROCEDURE .................................................................................................. 2
FOREWORD AND WARNING ............................................................................................................................. 3
PRODUCT SPECIFICATIONS ............................................................................................................................ 4
GENERAL INFORMATION ................................................................................................................................. 5
OPERATION ........................................................................................................................................................ 7
TROUBLESHOOTING GUIDE .......................................................................................................................... 11
TEST PROCEDURE .......................................................................................................................................... 13
TOUCH CONTROL PANEL ASSEMBLY ........................................................................................................... 23
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .............................................................. 30
PICTORIAL DIAGRAM ...................................................................................................................................... 39
POWER UNIT CIRCUIT .................................................................................................................................... 40
LSI UNIT CIRCUIT ............................................................................................................................................. 41
PRINTED WIRING BOARD ............................................................................................................................... 42
PARTS LIST ...................................................................................................................................................... 43
PACKING AND ACCESSORIES ....................................................................................................................... 48
dis tinctive appliances
SERVICE MANUAL
MODELS

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This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
1
S94M245P3021S
OVER THE RANGE
MICROWAVE OVEN
PMOR3021S
PMOR3021B
PMOR3021R
PMOR3021S
PMOR3021B
PMOR3021R
Rev 1
Page

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  • Page 1: Table Of Contents

    PMOR3021S PMOR3021B PMOR3021R SERVICE MANUAL Rev 1 S94M245P3021S OVER THE RANGE MICROWAVE OVEN PMOR3021S MODELS PMOR3021B PMOR3021R 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.

  • Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    2) contact DACOR and Food and Drug Administration's Center for Devices and Radiological Health immediately. Service personnel should inform DACOR of any certified unit found with emissions in excess of 4mW/cm The owner of the unit should be instructed not to use the unit until the oven has been brought into compliance.

  • Page 3: Warning To Service Personnel

    PMOR3021S PMOR3021B PMOR3021R 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) Inverter unit that includes High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectifier, Heat sink etc., and Magnetron, High...

  • Page 4: Microwave Measurement Procedure

    PMOR3021S PMOR3021B PMOR3021R SERVICING FOR INVERTER UNIT WARNING This inverter unit contains circuitry capable of producing high voltage and high current. Contact with any part of the high voltage will result in electrocution. DO NOT ACCESS ANY PARTS OF INVERTER UNIT WITH POWER SUPPLY CONNECTED.

  • Page 5: General Information

    MICROWAVE OVENS PMOR3021S/PMOR3021B/PMOR3021R GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Dacor Service Personnel OPERATION with Operation and Service Information for the DACOR MICRO- WAVE OVENS, PMOR3021S, PMOR3021B and PMOR3021R. It is recommended that service personnel carefully study the entire...
  • Page 6 PMOR3021S PMOR3021B PMOR3021R PRODUCT SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 12 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1200 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 29-15/16" Height 17" Depth 15- 9/16"...
  • Page 7 PMOR3021S PMOR3021B PMOR3021R GENERAL INFORMATION GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances.
  • Page 8 PMOR3021S PMOR3021B PMOR3021R PMOR3021S NOTE: Some one-touch cooking features such as "MINUTE PLUS" are disabled after three minutes when the oven is not in use. These features are automatically enabled when the door is opened and closed or the STOP/...

  • Page 9: Operation

    PMOR3021S PMOR3021B PMOR3021R OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during (1) When the door opens from a closed position, the oven operation. primary interlock switch and secondary interlock switch open their contacts, and then the monitor OFF CONDITION switch contacts close.
  • Page 10 PMOR3021S PMOR3021B PMOR3021R resistance reaches the value set according to the menu, VENTILATION METHODS HOT AIR EXHAUST supplementary cooking is started. The time of supplemen- 1. VERTICAL VENTING tary cooking is determined by experiment with each food For this venting method, hot air rising from the category and input into the LSI.
  • Page 11 PMOR3021S PMOR3021B PMOR3021R SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY SECONDARY INTERLOCK SWITCH N.O. N.O. PRIMARY INTERLOCK SWITCH FUSE OVEN LAMP MOTOR WITH TEMP. FUSE STIRRER MOTOR STOP SWITCH 120VAC HOOD FAN 60Hz. THERMAL...
  • Page 12 PMOR3021S PMOR3021B PMOR3021R DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM monitor switch contacts. CAUTION: BEFORE REPLACING A BLOWN MONITOR The door is opened by pushing the open button on the FUSE TEST THE STOP SWITCH, PRIMARY control panel, refer to the Figure D-1.

  • Page 13: Troubleshooting Guide

    PMOR3021S PMOR3021B PMOR3021R 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 14 PMOR3021S PMOR3021B CK = Check / RE = Replace PMOR3021R NOISE FILTER LOW VOLTAGE CK NO POWER AT OUTLET RE SHORTED IN POWER CORD CK OPENED OR SHORTED WIRING CK HOOD MOTOR CAPACITOR RE HOOD LAMP OR SOCKET RE STIRRER MOTOR...

  • Page 15: Test Procedure

    PMOR3021S PMOR3021B PMOR3021R 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. To discharge high voltage capacitor, wait for 60 seconds.
  • Page 16 PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Chart for checking the defective inverter unit No power at full power output cooking Magnetron is defective. Exchange the magnetron. Exchange the Inverter unit Brown monitor fuse The secondary interlock switch, primary interlock Check the switches according to switch and the monitor switch are operating properly.
  • Page 17 PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door closed.
  • Page 18 PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HOOD THERMAL CUT-OUT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. To discharge high voltage capacitor, wait for 60 seconds.
  • Page 19 PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 1. Key Unit. NOTE ; 1) Check key unit ribbon connection before replacement. 2) Re-install the hood intake duct R with seven (7) screws. 3) Re-install the outer case (cabinet). 4) Reconnect the power supply cord after the outer case is installed.
  • Page 20 PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by clearing with a beep the key unit is faulty and must be replaced.
  • Page 21 PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (6) Touch the “ START ” button. (7) The oven is in Easy defrost cooking condition. (8) The oven will operate as follows. Menu 1ST STAGE 2ND STAGE Steaks/Chops LEVEL TIME...
  • Page 22 PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 9) Disconnect the power supply cord. 10) Open the door and block it open. 11) To discharge high voltage capacitor, wait for 60 seconds. 12) Reconnect all leads removed from components during testing.
  • Page 23 PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (9) Reconnect the oven to the power supply and check the sensor cook operation as follows: 9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
  • Page 24 PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER NOISE FILTER 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: Touch Control Panel Assembly

    PMOR3021S PMOR3021B PMOR3021R TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units 3) Synchronizing Signal Circuit as shown in the touch control panel circuit. The power source synchronizing signal is available in...

  • Page 26: Description Of Lsi

    PMOR3021S PMOR3021B PMOR3021R DESCRIPTION OF LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description VL2-VL1 Power source voltage input terminal. Standard voltage for LCD. AN7-AN5 Terminal to change cooking input according to the Model.
  • Page 27 PMOR3021S PMOR3021B PMOR3021R Pin No. Signal Description Terminal not used. Connected to GND through the pull-down resistor. RESET Auto clear terminal. Signal is input to reset the LSI to the initial state when power is applied. Clock signal is output to a memory IC (IC3).
  • Page 28 PMOR3021S PMOR3021B PMOR3021R Pin No. Signal Description 48-72 SEG24-SEG0 Segment data signal. Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.) SEG 24 (48) ----------------- SEG24 (29)
  • Page 29 PMOR3021S PMOR3021B PMOR3021R HUMIDITY SENSOR CIRCUIT (1) Structure of Humidity Sensor As the sensor cooking proceeds, the food is heated to The humidity sensor includes two thermistors as shown generate moisture by which the resistance balance of in the illustration. One thermistor is housed in the closed the bridge circuit is deviated to increase the voltage vessel filled with dry air while another in the open vessel.
  • Page 30 PMOR3021S PMOR3021B PMOR3021R SERVICING 1. Precautions for Handling Electronic Components repair all the controls (sensor-related ones included) of This unit uses CMOS LSI in the integral part of the the touch control panel while keeping it connected to the circuits. When handling these parts, the following oven.
  • Page 31 PMOR3021S PMOR3021B PMOR3021R PRECAUTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder The "Control unit PWB and Inverter unit 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.

  • Page 32: Component Replacement And Adjustment Procedure

    PMOR3021S PMOR3021B PMOR3021R 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) Magnetron, Inverter Unit, High Voltage Harness etc..

  • Page 33: Outer Case Removal

    PMOR3021S PMOR3021B PMOR3021R 4. Remove the three (3) screws holding the hood louver to Left tab the oven cavity front face plate. 5. Pull the hood louver from the oven cavity by pushing the right and left tabs of the hood louver to remove.
  • Page 34 PMOR3021S PMOR3021B PMOR3021R HOOD FAN THERMAL CUT-OUT REMOVAL 1. Disconnect the power supply cord and remove the oven flange, the fan duct and base plate R. And remove the from wall and remove outer case. (Refer to procedure of hood intake duct R.
  • Page 35 PMOR3021S PMOR3021B PMOR3021R metal pieces may be produced. METHOD FOR INSTALLING FAN BALDE * Do not touch the pliers to the coil of the fan motor 1. Hold the center of the bracket which supports the shaft because the coil may be cut or damaged.
  • Page 36 PMOR3021S PMOR3021B PMOR3021R HOOD LAMP SOCKETS REMOVAL 6. Open the base cover. 1. Disconnect the power supply cord. 7. Screw the hood lamp off from the lamp socket. 2. Open the door and block it open. 3. To discharge the high voltage capacitor, wait for 60 seconds.

  • Page 37: Noise Filter Removal

    PMOR3021S PMOR3021B HUMIDITY SENSOR REMOVAL PMOR3021R 1. Disconnect the power supply cord, remove the oven of the humidity sensor should be positioned through from wall, and remove outer case. (Refer to procedure of the hole of the oven cavity top plate (right).
  • Page 38 PMOR3021S PMOR3021B PMOR3021R STOP SWITCH, PRIMARY INTERLOCK SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL 1. Disconnect the power supply cord and remove the oven 9. Remove each switch from the latch hook by pushing the from wall and remove outer case. (Refer to procedure of one (1) stopper tab holding each switch.

  • Page 39: Door Replacement

    PMOR3021S PMOR3021B PMOR3021R DOOR REPLACEMENT After any servicing, make sure of the following : DOOR ASSEMBLY REMOVAL 1. Door latch heads smoothly catch latch hook through 1. Disconnect the power supply cord. latch holes and that latch head goes through center of 2.
  • Page 40 PMOR3021S PMOR3021B PMOR3021R 9. Pry the choke cover by inserting a putty knife in order shown in Figure C-3. Door stopper 10.Now choke cover is free from door panel and door frame. NOTE: When carrying out any repair to the door, do not...
  • Page 41 PMOR3021S PMOR3021B PMOR3021R...

  • Page 42: Power Unit Circuit

    PMOR3021S PMOR3021B PMOR3021R Figure S-2b. Power Unit Circuit...
  • Page 43 PMOR3021S PMOR3021B PMOR3021R...

  • Page 44: Printed Wiring Board

    PMOR3021S PMOR3021B PMOR3021R Figure S-4. Printed Wiring Board...

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