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GE Consumer & Industrial
TECHNICAL SERVICE GUIDE
Over the Range
Microwave Oven
MODEL SERIES:
JVM2070_H
PUB # 31-9111 2/04
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! IMPORTANT SAFETY NOTICE The information in this service guide is intended for use by individuals possessing adequate backgrounds of electrical, electronic, and mechanical experience. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use. WARNING To avoid personal injury, disconnect power before servicing thi
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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. IF THE OVEN OPERATES WITH THE DOOR OPEN, INSTRUCT THE USER NOT TO OPERATE THE OVEN AND CONTACT THE MANUFACTURER IMMEDIATELY. C. MAKE THE FOLLOWING SAFETY CHECKS ON ALL OVENS TO BE SERVICED BEFORE ACTIVATING THE MAGNETRON OR OTHER MICROWAVE SOURCE, AND MAKE REPAIRS AS NECESSARY: 1. INTERLOCK OPERATION. 2. PROPER
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Table of Contents Bottom and Hood Thermal Cutout (TCO) ....................................................................................................18 Cavity Thermal Cutout (TCO) ......................................................................................................................13 Component Locator Views .......................................................................................................................... 7 Components..................................
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Nomenclature Model Number J V M 2 0 7 0 W H Product Model Year J = GE Cooking Product Designator Case Color Microwave Oven S = Stainless V = Over-the-Range Model W = White Installation C = Bisque M = Mounts Under Cabinet B = Black Cavity Size (cu. ft.) Feature Pack 20 = 2.0 cu. ft. Designates features–the higher the number, the more features. Serial Number The nomenclature plate is located on the microwave cabinet inside the door. In The first two numbers of the serial number addition to
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Control Features Press TROUBLESHOOTER to find Touchscreen Display troubleshooting tips for common microwave problems. The touchscreen display provides the access to all cook and defrost controls. If the touchscreen is Press SPACEMAKER 2.0 OVERVIEW to find dark, press the HOME button, the touchscreen, an overview of the features of your or open the door to access the menu. microwave. OFF WARNING: Pressing OFF does not disconnect the appliance from the power supply. Pressing OFF while on the H
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Component Locator Views Top View 4 8 5 6 9 7 10 2 1 3 1 - Interior Light 2 - Main and HV Transformer Fuses 3 - Hidden Vent Switch and Motor 4 - Vent Fan and Motor 5 - Top Stirrer Motor 6 - Cavity Thermal Cutout (TCO) 7 - Side Stirrer Motor 8 - Magnetron Antenna Waveguide 9 - Vent Tunnel 10 - Gas Sensor – 7 –
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Right Side View 2 1 5 6 4 3 8 7 1 - Magnetron 2 - Magnetron Thermal Cutout (TCO) 3 - High Voltage Transformer 4 - Magnetron Cooling Fan Motor and Blade 5 - High Voltage Capacitor 6 - Door Sensing Switch (Primary Interlock and Monitor Switch in plastic mount - not shown) 7 - Bottom Thermal Cutout (TCO) 8 - Hood Thermal Cutout (TCO) – 8 –
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Components Exhaust Fan Microwave Removal and Component Access Resistance through the exhaust fan from the power cord (N) to CN03 pin 7 is approximately Note: Some components can be accessed 28.7 ohms. without removing the microwave. If the 2 end screws on top of the outer cover are accessible Removal (see illustration below), the hidden vent can be Remove the microwave (see Microwave Removal removed without removing the microwave from its and Component Access). Remove the screw on installation.
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Side Stirrer Motor Side Stirrer The side stirrer motor is located on the left side of Removal the microwave oven. Open the oven door. Pull the plastic rivet out of the Resistance through the side stirrer motor from stirrer cover. Rotate the stirrer cover CCW until it the power cord (L) to CN04 pin 5 is approximately stops and remove the stirrer cover. 6.7 ohms. Isolated, the side stirrer motor is approximately 7.0 ohms. The door (primary interlock) must be closed to complete circuit. Check motor
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Top Stirrer Motor Top Stirrer Resistance through the top stirrer motor from the Removal power cord (L) to CN04 pin 5 is approximately Open the oven door. Pull the plastic rivet out of the 6.7 ohms. Isolated, the top stirrer motor is stirrer cover. Rotate the stirrer cover CCW until it approximately 7.0 ohms. The door (primary stops and remove the stirrer cover. interlock) must be closed to complete circuit. Check motor circuit for 21 VAC when operating. Rivet Removal Remove the microwave (see Mi
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Remove 3 screws from the fan motor mounting Cooling Fan and Motor plate. Slide the mounting plate forward to allow access to the fan blade. Slide the fan blade off of Resistance through the cooling fan motor from the fan motor shaft. the power cord (L) to CN04 pin 7 is approximately 24.7 ohms. The door (primary interlock) must be closed to complete circuit. The cooling fan motor, in series with the drive motors, provides voltage reduction to 21 VAC. Removal Remove the microwave (see Microwave Re
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Cavity Thermal Cutout (TCO) The cavity TCO is located on the top of the microwave oven on the left side of the forward vent duct. The microwave oven shuts off when the temperature of the cavityTCO reaches 212°F (100°C). The cavity TCO is a normally closed switch. An open reading across the TCO indicates an overtemperature condition or failed TCO. The cavity TCO is not resettable. Removal Remove the microwave (see Microwave Removal and Component Access). Slide the cavity TCO from the two tabs and
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Magnetron Transformer The magnetron is located behind the fan mounting The transformer is located behind the fan plate. mounting plate below the magnetron. Removal Resistance through the transformer from the power cord (L) to the high-power secondary WARNING: Prior to servicing the magnetron, be interlock (blue wire) is approximately 0.32 ohms. certain the capacitor is discharged. Manually The door (primary and monitor interlock) must be discharge by placing an insulated-handle closed. screwdriv
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Interior Light Hidden Vent Motor Resistance through the interior light from the The hidden vent motor is located behind the CN02 pin 7 to the power cord (L) is approximately hidden vent on the right side. 24.9 ohms. Resistance through the hidden vent motor from Removal the CN03 pin 1 to the power cord (N) is approximately 28.8 ohms. Note: This component may be able to be accessed without removing the microwave. If the Removal 2 end screws on top of the outer cover are Note: This component may
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Door Interlock Switches Control Panel The oven has 3 interlock switches. All switches The control panel contains the smart board, the are removed the same. touchscreen panel, and a three-button circuit board. Run the test for the control panel (see Door Sensing and Primary Interlock Switches Control Performance Test). The control panel is replaced as an assembly. The primary interlock and monitor switches are located on the bottom of the plastic switch Removal bracket. The power relay is mounted
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Using a small screwdriver, release the tab and Interlocks (Door Latch Switches) remove the door interlock switch from the door Interlocks are designed as follows: switch bracket. Disconnect the electrical connector. Door Sensing Switch (top) Primary Interlock System Test WARNING: Disconnect the oven from the power supply. Door Sensing Switch 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 wi
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Remove 2 wires from the TCO. Remove the High Voltage Capacitor screw that holds the TCO in place and slide the tab of the TCO out of the oven frame. Removal and Replacement WARNING: Prior to servicing, be certain the capacitor is discharged. Manually discharge by placing an insulated-handle screwdriver between Hood TCO the diode connection of the capacitor and the oven chassis ground. Bottom TCO Remove the hidden vent (see Microwave Removal and Component Access). Remove the screw and grill. Lift
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Surface Lamps Surface Lamp Assemblies Resistance through the surface lamps from the Removal CN04 pin 3 to the power cord (N) is approximately Remove the screw on the surface lens panel and 62 ohms. open the panel. Removal Remove 5 screws from the bottom of the microwave oven cabinet and remove the bottom plate. Pull the light out of the socket. Note: When installing a new halogen bulb, be sure to handle the bulb with a clean, dry cloth. Replace the halogen lamp with a 120VAC, 20W GE halogen lamp
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Troubleshooting Control Performance Test Set Time: 1. Touch OPTIONS on the HOME display. 2. Touch SET CLOCK on the OPTIONS display. 3. Using the numbers on the touchscreen, enter the time of day. Press ENTER when finished or CLEAR to erase the time you entered. 4. Select AM or PM from the touchscreen. Press ENTER when finished or BACK to enter a new time. Alternately touch each function pad and enter time, temperature, and power level selection for the function. Touch CLEAR after each functi
