PMOR3021S PMOR3021B PMOR3021R SERVICE MANUAL Rev 1 S94M245P3021S OVER THE RANGE MICROWAVE OVEN MODELS PMOR3021S 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. 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.
PMOR3021S PMOR3021B PMOR3021R 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.
PMOR3021S PMOR3021B PMOR3021R 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. (Example) Inverter unit that includes High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectifier, Heat sink etc., and Magnetron, High Voltage Harness etc.. Read the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage 1.
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. DO NOT OPERATE INVERTER UNIT ITSELF. It is dangerous because this unit contains high voltage components. MICROWAVE MEASUREMENT PROCEDURE A.
PMOR3021S PMOR3021B PMOR3021R SERVICE MANUAL dis tinctive appliances PRODUCT DESCRIPTION MICROWAVE OVENS PMOR3021S/PMOR3021B/PMOR3021R GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Dacor Service Personnel with Operation and Service Information for the DACOR MICROWAVE OVENS, PMOR3021S, PMOR3021B and PMOR3021R. OPERATION 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.
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" Cooking Cavity Dimensions 2.1 Cubic Feet Width 22-9/16" Height 10-9/16" Depth 15" Hood lamp 2 bulbs, 20W x 2, Incandescent light bulbs Hood fan Approx. 300 C.F.M./ 270 C.F.M.
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. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.
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/ CLEAR pad is pressed.
PMOR3021S PMOR3021B PMOR3021R OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. (1) When the door opens from a closed position, the primary interlock switch and secondary interlock switch open their contacts, and then the monitor switch contacts close. And contacts of the relay (RY1) remain closed.
PMOR3021S PMOR3021B PMOR3021R VENTILATION METHODS HOT AIR EXHAUST resistance reaches the value set according to the menu, supplementary cooking is started. The time of supplementary cooking is determined by experiment with each food category and input into the LSI. An example of how sensor works: (BAKED POTATOES) 1.
PMOR3021S PMOR3021B PMOR3021R SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY YLW B1 RY5 C3 C5 C2 B3 Low RY6 BLK WHT WHT WHT A1 H3 OVEN LAMP RELAY A3 RED HOOD CAPACITOR F2 NOISE FILTER COM F1 A3 BRN or PPL WHT GRY GRY BLU BLU BLU WHT BLU M INVERTER UNIT BLU GRY BLU YLW RED YLW RED AC3 N.C. BLU HL BLU RED MONITOR SWITCH HUMIDITY SENSOR WHT HOOD LAMP HL GRY BLU COM. N. O.
PMOR3021S PMOR3021B PMOR3021R DESCRIPTION AND FUNCTION OF COMPONENTS monitor switch contacts. CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE STOP SWITCH, PRIMARY INTERLOCK SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE"). NOTE: MONITOR FUSE AND SWITCH ARE REPLACED AS AN ASSEMBLY DOOR OPEN MECHANISM The door is opened by pushing the open button on the control panel, refer to the Figure D-1.
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. These tests are given a procedure letter which will be found in the "Test Procedure "section.
12 SENSOR COOKING CONDITION MICROWAVE COOKING CONDITION IDLE CONDITION OFF CONDITION POSSIBLE CASE AND DEFECTIVE PARTS The oven Stops and "ERROR" is displayed or does not end during Sensor Cooking condition. (Oven does not shut off after a cup of water is boiling by Sensor Cooking.) Oven stops at 32 seconds after starting. Oven does not go into cook cycle when START pad is touched Oven seems to be operating but little or no heat is produced in oven load.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST MAGNETRON ASSEMBLY TEST 1. 2. 3. 4. 5. 6. 7. 8. 9. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. To discharge high voltage capacitor, wait for 60 seconds. 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.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Chart for checking the defective inverter unit No power at full power output cooking YES Magnetron is defective. NO Exchange the Inverter unit Exchange the magnetron. Brown monitor fuse The secondary interlock switch, primary interlock NO switch and the monitor switch are operating properly. Check the switches according to the switch Test Procedure YES Exchange the Inverter unit C OVEN THERMAL CUT-OUT TEST 1. 2. 3. 4.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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. If improper operation is indicated, replace the stop switch. 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER H COMPONENT TEST HOOD THERMAL CUT-OUT TEST 1. 2. 3. 4. 5. 6. 7. 8. I Disconnect the power supply cord, and then remove outer case. Open the door and block it open. To discharge high voltage capacitor, wait for 60 seconds. A continuity check across the thermal cut-out terminals should indicate an open circuit unless the temperature of the thermal cut-out reaches approximately 140oF(60oC) or more. At that temperature, the contacts will close.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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. 5) Run the oven and check all functions. The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 62 1 L G4 G3 61 59 58 57 56 55 54 53 52 G5 G6 G7 G8 G9 G10 G11 G12 0 5 4 3 Cook Dinner Easy Defrost 8 1 2 Breakfast Menu 6 7 9 Soften Warm Reheat START EASY MINUTE POWER LEVEL G2 60 G1 6. 7. 8. 9. schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (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 LEVEL TIME 0.5lbs 40% 57sec. 40% 22sec. (9) If improper operation is indicated, the control unit is probably defective and should be checked.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 9) 10) 11) 12) 13) 14) 15) 16) O Disconnect the power supply cord. Open the door and block it open. To discharge high voltage capacitor, wait for 60 seconds. Reconnect all leads removed from components during testing. Re-install the hood intake duct R. Re-install the outer case (cabinet). Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (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. 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the door. 9-4. Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice, the START pad once, the number pad 1 once and the number pad 4 once. 9-5.
PMOR3021S PMOR3021B PMOR3021R TEST PROCEDURES PROCEDURE LETTER P COMPONENT TEST NOISE FILTER TEST 1. 2. 3. 4. 5. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Disconnect the leads to the primary of the power transformer. Using an ohm-meter, check between the terminals as described in the following table: SOURCE NOISE FILTER UNIT SOURCE NOISE SUPPRESSION COIL LINE CROSS CAPACITOR TOR 0.
PMOR3021S PMOR3021B PMOR3021R TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as shown in the touch control panel circuit. 3) Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit. It incorporates a very small error because it works on commercial frequency.
PMOR3021S PMOR3021B PMOR3021R DESCRIPTION OF LSI LSI The I/O signal of the LSI is detailed in the following table. Pin No. 1-2 Signal VL2-VL1 I/O IN 3-5 AN7-AN5 IN 6 AN4 IN 7 8 AN3 AN2 OUT IN 9 AN1 IN 10 AN0 IN 11 P57 OUT Description Power source voltage input terminal. Standard voltage for LCD. Terminal to change cooking input according to the Model.
PMOR3021S PMOR3021B PMOR3021R Pin No. Signal I/O 25 26 27 P41 P40 RESET OUT IN IN 28 29 30 P71 P70 XIN OUT OUT IN 31 XOUT OUT 32 VSS IN 33 P27 OUT 34 P26 OUT 35 P25 OUT 36 P24 OUT 37 P23 OUT 38 P22 OUT 39 P21 OUT 40 P20 OUT 41 P17 OUT 42 P16 OUT 43 P15 OUT 44 P14 OUT P13-P12 SEG25 OUT OUT 45-46 47 Description Terminal not used. Connected to GND through the pull-down resistor. Auto clear terminal.
PMOR3021S PMOR3021B PMOR3021R Pin No. Signal I/O Description 48-72 SEG24-SEG0 OUT 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.
PMOR3021S PMOR3021B PMOR3021R HUMIDITY SENSOR CIRCUIT (1) Structure of Humidity Sensor The humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled with dry air while another in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow.
PMOR3021S PMOR3021B PMOR3021R SERVICING 1. Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc.
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. Example: Sn-Ag-Cu Indicates lead-free solder of tin, silver and copper. 2. Using lead-free wire solder When repairing a PWB with the "LF" symbol, only lead-free solder should be used.
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.. WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. Disconnect the power supply cord. 2.
PMOR3021S PMOR3021B PMOR3021R 4. Remove the three (3) screws holding the hood louver to 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. 6. Now, the hood louver is free. Left tab Right tab Screws Hood louver REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven) 5. While supporting the front of the oven, pull down the two (2) mounting levers and release the oven from the unit mounting plate.
PMOR3021S PMOR3021B PMOR3021R HOOD FAN THERMAL CUT-OUT REMOVAL 1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal") 2. Open the door and block it open. 3. To discharge the high voltage capacitor, wait for 60 seconds. 4. Remove the seven (7) screws holding the hood intake duct R to the oven cavity top plate, the oven cavity front 5. 6. 7. 8. flange, the fan duct and base plate R.
PMOR3021S PMOR3021B PMOR3021R metal pieces may be produced. Do not touch the pliers to the coil of the fan motor because the coil may be cut or damaged. * Do not disfigure the bracket by touching with the pliers. 2. Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand. 3. Now, the fan blade will be free. CAUTION: * Do not reuse the removed fan blade because the hole (for shaft) may be larger than normal. ı METHOD FOR INSTALLING FAN BALDE 1.
PMOR3021S PMOR3021B PMOR3021R HOOD LAMP SOCKETS REMOVAL 6. 7. 8. 9. Open the base cover. Screw the hood lamp off from the lamp socket. Disconnect the wire leads from the lamp socket. Push the tab holding the lamp socket to the hood lamp mount. 10.Remove the lamp socket from the hood lamp mount. 11. Now, the lamp socket is free. 1. 2. 3. 4. Disconnect the power supply cord. Open the door and block it open. To discharge the high voltage capacitor, wait for 60 seconds.
PMOR3021S PMOR3021B PMOR3021R HUMIDITY SENSOR REMOVAL 1. Disconnect the power supply cord, remove the oven from wall, and remove outer case. (Refer to procedure of "REMOVAL OF OVEN FROM WALL" AND "OUTER CASE REMOVAL".) And proceed as follows. 2. Open the door and block it open. 3. To discharge the high voltage capacitor, wait for 60 seconds. 4. Remove seven (7) screws holding the hood intake duct R to the oven cavity top plate, the oven cavity front flange, fan duct, base plate R, and magnetron duct.
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 from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal") 2. Open the door and block it open. 3. To discharge the high voltage capacitor, wait for 60 seconds. 4.
PMOR3021S PMOR3021B PMOR3021R DOOR REPLACEMENT After any servicing, make sure of the following : 1. Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole. 2. Deviation of door alignment from horizontal line of cavity face plate is to be less than 1.0mm. 3. Door is positioned with its face pressed toward cavity face plate. 4. Re-install outer case and check for microwave leakage around door with an approved microwave survey meter.
PMOR3021S PMOR3021B PMOR3021R 9. Pry the choke cover by inserting a putty knife in order shown in Figure C-3. 10.Now choke cover is free from door panel and door frame. NOTE: When carrying out any repair to the door, do not bend or warp the slit choke (tabs on the door panel assembly) to prevent microwave leakage. Door stopper A Choke cover DOOR FRAME ASSEMBLY 11.Remove four (4) screws holding the door panel to the door frame assembly. 12.Release the door panel from the door frame assembly.
4 NOISE FILTER BOARD GRY GRY BLU WHT 1 RY3 9 N.O. T1. CN-A 1 GRY BLK 5 YLW 2 3 9 PPL 5 RED 6 7 ORG 8 4 RED 1 CN-A 3 WHT 2 CN-B 1 YLW ORG 4 5 CN-C 3 2 1 1 YLW 2 CN-H 3 PPL 2 GRN BLK CN-E 1 BLU COM. N.O. N.O. COM. ORG BRN BLK GRN BLK N.O. ORG BLK BLK RED MONITOR SWITCH COM. COM. SECONDARY INTERLOCK SWITCH N.C.
PMOR3021S PMOR3021B PMOR3021R 1 2 4 3 5 6 A A B B C C D D E E F F G G H H Figure S-2b.
PMOR3021S PMOR3021B PMOR3021R 1 2 4 3 5 6 A B B C C D D Figure S-3b.
PMOR3021S PMOR3021B PMOR3021R 1 2 4 3 5 6 A A B B C C D D E E F F G G H H Figure S-4.
