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Frigidaire PLMV178HC Service Manual

Over - range microwave oven
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OVER - RANGE MICROWAVE OVEN
SERVICE MANUAL
MODEL : PLMV178HC
! ATTENTION !
This service manual is intended for use by persons having electrical and mechanical training
and a level of knowledge of these subjects generally considered acceptable in the appliance
repair trade. Electrolux Home Products cannot be responsible, nor assume any liability, for
injury or damage of any kind arising from the use of this manual.
Publication # 5995526752
October 2008
Part # 316439267

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Summary of Contents for Frigidaire PLMV178HC

  • Page 1 OVER - RANGE MICROWAVE OVEN SERVICE MANUAL MODEL : PLMV178HC ! ATTENTION ! This service manual is intended for use by persons having electrical and mechanical training and a level of knowledge of these subjects generally considered acceptable in the appliance repair trade.

  • Page 2: Table Of Contents

    Contents 1. Precaution ................3 1-1 Safety precautions .

  • Page 3: Precaution

    PRECAUTION 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 (c) Before turning on microwave power for operated with the door open. any service test or inspection within the microwave generating compartments, (b) Make the following safety checks on all check the magnetron, wave guide or...

  • Page 4: Safety Precautions

    1. Precaution Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use, repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially lethal high voltages and currents. 1-1 Safety precautions ( 1.
  • Page 5 1-2 Special High Voltage Precautions 1. High Voltage Warning ! Do not attempt to measure any of the high voltages --this includes the filament voltage of the magnetron. High voltage is present during any cook cycle. Before touching any components or wiring, always unplug the oven and discharge the high voltage capacitor (See Figure 1-1) 2.

  • Page 6: Specifications

    2. Specifications 2-1 Table of Specifications TIMER 99 MINUTES 99 SECONDS POWER SOURCE 120V 60Hz, AC POWER CONSUMPTION MICROWAVE : 1,650W OUTPUT POWER 1,000 W OPERATING FREQUENCY 2,450MHz MAGNETRON OM75P(10) COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS ”(W) x 16 ”...

  • Page 7: Operating Instructions

    3. Operating Instructions 3-1 Control Panel Page 7 - 4 -...

  • Page 8: Features & External Views

    3-2 Features & External Views 758.8 mm 387.3 mm Page 8 - 5 -...

  • Page 9: Accessory

    3-3 Accessory Glass tray Roller guide ring Registration card Top template Wall template Installation instructions Use and Care Guide Hardware-kit Grease filter Charcoal filter Page 9 - 6 -...

  • Page 10: Installation

    4. Installation The Microwave Oven is supported by a special bracket assembly (mounting system) supplied with the oven. The bracket assembly must be mounted to the wall with toggle bolts through the wall, and a lag screw into a wall stud. After the bracket assembly is installed, the unit can be slid over the two rails of the bracket assembly.

  • Page 11: Automatic Fan

    4. Installation (Continued) REUSABLE GREASE FILTERS The metal filter trap grease released by foods on the cooktop. They also prevent flames from foods on the cooktop from damaging the inside of the microwave. For this reason, the filter must ALWAYS be in place when the hood the vent fan is used.

  • Page 12: Disassembly And Reassembly

    5. Disassembly and Reassembly MAGNETRON, MOTOR ASSEMBLY, VENT BLOWER AND HIGH VOLTAGE TRANSFORMER Oven must be removed from wall. REMOVING OVEN FROM WALL (2 PEOPLE REQUIRED) Oven is hooked on metal tabs at bottom of wall mounting plate and to cabinet by (3) top cabinet bolts. 5-1 Replacement of High Voltage Transformer .

  • Page 13: Replacement Of Door Assembly

    5-3 Replacement of Door Assembly 5-3-1 Removal of Door “C” Open the door and remove the door by pulling up from hinge holes. Door "A" Door "C" 5-3-2 Removal of Door “E” Following the procedure as shown in the figure, insert and bend a thin metal plate between Door “E”...

  • Page 14: Replacement Of Fuse

    5-4 Replacement of Fuse The fuse is located on the noise filter. 1. Disconnect power and remove grille. FUSE 2. Replace the fuse. 3. When 20A fuse blows out by the operation of interlock monitor switch failure, replace the primary interlock switch, secondary interlock switch, door sensing switch, interlock monitor switch and power relay.

  • Page 15: Replacement Of Stirrer Motor

    5-6 Replacement of stirrer motor 1. Disconnect power and remove grille screws(3). 2. Remove grille and the bracket duct upper screw(1). 3. Remove the bracket duct upper and disconnect the stirrer motor wire. 4. Remove stirrer motor screws(1) and pull the stirrer motor.

  • Page 16: Replacement Of Control Circuit Board

    5-8 Replacement of Control Circuit Board 5-8-1 Removal of Control Box 1. Disconnect power and remove grille. 2. Be sure to ground any static electric charge in your body and never touch the control circuit. 3. Disconnect the connectors from the control circuit board.

  • Page 17: Sensor

    5-9 Sensor The Sensor Cooking Function uses a special humidity sensor which detects humidity during the cooking process. Before conducting either of the sensor tests below, ensure the unit is plugged into a wall outlet for at least 5 minutes. If already plugged in, proceed. The sensor is a plug-in device located in the vent area at the top left hand corner of the cavity behind the grille.

  • Page 18: Alignment And Adjustments

    6. Alignment and Adjustments PRECAUTION 1. High voltage is present at the high voltage terminals during any cook cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the high voltage capacitor.

  • Page 19: High Voltage Capacitor

    6-3 High Voltage Capacitor 1. Check continuity of the capacitor with the meter set at the highest resistance scale. 2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9MΩ. 3. A shorted capacitor will show continuous continuity. 4.

  • Page 20: Vent Exhaust Blower Motor

    6-7 Vent Exhaust Blower Motor THIS COMPONENT REQUIRE REMOVAL OF MICROWAVE OVEN FROM INSTALLATION FOR SERVICING. The blower is a two speed (HI-LO) capacitor run blower assembly located on top of the microwave oven. The blower is operated by low voltage relays located on the smart board.

  • Page 21: Thermal Cutout (Tco's)

    6-8 Thermal Cutout (TCO’S) There are 4 different thermal cutouts in this unit with 4 different purposes. They are : 1. Oven thermal cutout (flame sensor), on cavity top. 2. Hood thermal cutout, inside control area on duct. 3. Bottom thermal cutout, on floor of control area. 4.

  • Page 22: Bottom Thermal Cutout

    6-8-3 Bottom Thermal Cutout THIS COMPONENT REQUIRE REMOVAL OF MICROWAVE OVEN FROM INSTALLATION FOR SERVICING. During a fire on the stove the heat could be intense enough to close the Hood Thermal Cutout and force the fan to run. While at moderate high temperature we do want it to run, however during a fire it is advantageous to NOT have the vent fan running.

  • Page 23: Output Power Of Magnetron

    6-9 Output Power of Magnetron CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY. The output power of the magnetron can be measured by performing a water temperature rise test. Equipment needed : * Two 1-liter cylindrical borosilicate glass vessel (Outside diameter 190 mm) * One glass thermometer with mercury column...

  • Page 24: Procedure For Measurement Of Microwave Energy Leakage

    6-10 Procedure for Measurement of Microwave Energy Leakage 1. Pour 275±15cc of 20±5°C(68±9°C) water in a beaker which is graduated to 600cc, and place the beaker in the center of the oven. 2. Start to operate the oven and measure the leakage by using a microwave energy survey meter.

  • Page 25: Troubleshooting

    7. Troubleshooting PRECAUTION 1. CHECK GROUNDING BEFORE CHECKING FOR TROUBLE. 2. BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT. 3. DISCHARGE THE HIGH VOLTAGE CAPACITOR. 4. WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER, DISCONNECT ONE LEAD WIRE FROM THESE PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON. TO DO OTHERWISE MAY RESULT IN A FALSE READING OR DAMAGE TO YOUR METER.
  • Page 26 7-1 Electrical Malfunction (Continued) SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor turn 1. Misadjustment or loose wiring of primary Adjust door and latch switches. latch switch 2. Defective primary latch switch Oven can program but timer 1. Open or loose wiring of secondary interlock Adjust door and interlock switches.

  • Page 27: Error Code

    7-2 Error Code ERROR ERROR CASE - SE - Key Short Error (10 seconds) Open error. Sensor unpluged, wiring or smart board. Short error. Shorted sensor or smart board Page 27 - 24 -...

  • Page 28: Exploded Views And Parts List

    8. Exploded Views and Parts List 8-1 Exploded Views 74 73 Page 28...

  • Page 29: Main Parts List

    Parts List Parts List 8-2 Main Parts List 8-2 Main Parts List 78HC PLMV178HC PLMV178HC arts Code ts Description Code Parts Description Parts Code Parts Code Parts Description Q’ty Price Parts Description Parts Description Q’ty Price Parts Code Q’ty Price Parts Code Q’ty Price...

  • Page 30: Schematic Diagrams

    0-1 Schematic Diagrams 9. Schematic Diagrams 9-1 Schematic Diagrams Page 30...

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