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GE Appliances DVM1950, Technical Service Manual

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Cavity Thermal Cut Out (TCO)

Cavity TCO

The cavity TCO is a one-shot device that will open at 
230°F if a thermal event takes place within the oven 
cavity.

1.  Remove the outer cover. (See 

Outer Cover

.)

2.  Disconnect leads from the cavity TCO using 
needle-nose pliers by gently pulling the terminals off 
the male cavity TCO terminals. 

Note: 

Both the insulated and non-insulated wire 

terminal ends have locking tabs. The insulated wire 
terminal end can be removed by inserting a small, 
flat screwdriver between the insulator and the 
terminal end on the locking tab side. Depress the 
locking tab with the tip of the screwdriver to unlock 
from the terminal while pulling electrical wire end off 
the terminal.

  

Vent Thermal Cut Out (TCO)

The vent TCO is attached to the magnetron cooling 
fan motor mounting bracket. The contacts close at 
approximately 158°F and open at approximately 
104°F.

To remove the vent TCO:

1.  Remove the control panel assembly.                

(See 

Control Panel Assembly

.

)

2.  Disconnect wiring to the vent TCO.

3.  Remove the Phillips-head screw attaching the 

vent TCO to the cooling fan motor mounting 
bracket and lift it out from the slot in the 
mounting bracket.

Disconnect

Disconnect

Spring Clip

Slide the cavity TCO from beneath the spring clips.

Vent TCO

Summary of Contents for Appliances DVM1950

Page 1: ...liances General Electric Company Louisville Kentucky 40225 31 9222 GE Spacemaker Over the Range Microwave Oven Technical Service Guide DECEMBER 2011 GE Appliances DVM1950 JNM1951 JVM1950 PNM1971 PVM1970 PVM2170 ...

Page 2: ...ompany 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 MA...

Page 3: ... EXUQ RII WKH SDG DQG WRXFK HOHFWULFDO SDUWV LQYROYLQJ ULVN RI HOHFWULF VKRFN 7R UHGXFH WKH ULVN RI EXUQV HOHFWULF VKRFN ILUH LQMXU WR SHUVRQV RU H SRVXUH WR H FHVVLYH PLFURZDYH HQHUJ 51 1 35 87 216 72 92 3266 32685 72 66 9 0 52 9 1 5 D R 1RW WWHPSW WR RSHUDWH WKLV RYHQ ZLWK WKH GRRU RSHQ VLQFH RSHQ GRRU RSHUDWLRQ FDQ UHVXOW LQ KDUPIXO H SRVXUH WR PLFURZDYH HQHUJ W LV LPSRUWDQW QRW WR GHIHDW RU WD...

Page 4: ...0 DVM1950 JNM1951 PVM1970 PNM1971 39 Cooling Fan Motor 33 Demo Mode 36 Display Board 29 Door Assembly 21 Door Interlocks Door Latch Switches 40 Door Interlock Switches 27 Error Messages 38 Grille Assembly 19 High Voltage Fuse 25 High Voltage Half Wave Doubler 47 High Voltage Transformer 35 Interior Light 22 Introduction 7 Key Panel Test JVM1950 DVM1950 PVM1970 42 Line Fuse 25 Magnetron 31 Magnetro...

Page 5: ... Schematics and Wiring Diagrams 43 Sensor 41 Smart Board 28 Stirrer Assembly 24 Surface Lamps 30 Technical Data Sheet JVM1950 DVM1950 JNM1951 PVM1970 PNM1971 39 Troubleshooting 37 Turntable Coupling 30 Turntable Motor 30 Vent Blower 25 Vent Fan Motor Capacitor 31 Vent Thermal Cut Out TCO 32 Warranty 48 ...

Page 6: ...tabs just above the smart board Nomenclature Microwave Oven V Externally Vented Over the Range Product P GE Cooking Product Cavity Size cu ft 19 1 9 cu ft 21 2 1 cu ft Model Door Color D Color Matched Engineering Model Suffix Nomenclature Serial Number The first two characters of the serial number identify the month and year of manufacture Example ZV123456S December 2011 Z DEC A JAN D FEB F MAR G ...

Page 7: ...USDA MyPlate gov menu Preprogrammed foods and recipes assist in preparation of healthy meal choices Steam cook button Perfectly prepares your steamed favorites for maximum nutrition retention Two piece design with hidden vent Creates a streamlined look for a smooth finish Four speed 400 CFM venting system Quickly removes smoke steam and odors from the cooktop for fresher cleaner kitchen air Recess...

Page 8: ... 8 Control Features Continued next page PVM2170 Features Throughout this manual features and appearance may vary from your model ...

Page 9: ...nience Features Press Enter STEAM Enter pad to select Food My Pyramid Enter pad to select Food FAMILY SNACKS Enter pad to select Food Check the Convenience Guide before you begin MyPlate gov Press Enter COOKING MENU Food Type Cook Type etc DEFROST Time Weight Food Type or 1 lb Quick Defrost SETTINGS Help Clock Settings Turntable On Off Auto Night Light Beeper Volume Reminder TIMER Kitchen Timer Se...

Page 10: ...0HWDO 6KLHOG 6FUHHQ DOORZV FRRNLQJ WR EH YLHZHG ZKLOH NHHSLQJ PLFURZDYHV FRQILQHG LQ WKH RYHQ RQWURO 3DQHO 5HPRYDEOH 7XUQWDEOH R QRW RSHUDWH WKH RYHQ LQ WKH PLFURZDYH PRGH ZLWKRXW WKH WXUQWDEOH DQG WXUQWDEOH VXSSRUW VHDWHG DQG LQ SODFH 5HPRYDEOH 7XUQWDEOH 6XSSRUW R QRW RSHUDWH WKH RYHQ LQ WKH PLFURZDYH PRGH ZLWKRXW WKH WXUQWDEOH DQG WXUQWDEOH VXSSRUW VHDWHG DQG LQ SODFH ...

Page 11: ... Settings Timer Popcorn Reheat Snacks Soften Steam Family Cancel KHFN WKH RQYHQLHQFH XLGH EHIRUH RX EHJLQ Continued next page Press Enter POPCORN Starts immediately REHEAT Starts immediately FAMILY SNACKS Enter pad to select Food SOFTEN Enter pad to select Food MELT Enter pad to select Food MyPlate gov Enter pad to select Food Press Enter COOK Amount of cooking time DEFROST Time Weight or 1 lb Qui...

Page 12: ...UHV RI WKH 2YHQ RRU DQGOH RRU DWFKHV LQGRZ ZLWK 0HWDO 6KLHOG 6FUHHQ DOORZV FRRNLQJ WR EH YLHZHG ZKLOH NHHSLQJ PLFURZDYHV FRQILQHG LQ WKH RYHQ RQWURO 3DQHO 5HPRYDEOH 7XUQWDEOH R QRW RSHUDWH WKH RYHQ LQ WKH PLFURZDYH PRGH ZLWKRXW WKH WXUQWDEOH DQG WXUQWDEOH VXSSRUW VHDWHG DQG LQ SODFH 5HPRYDEOH 7XUQWDEOH 6XSSRUW R QRW RSHUDWH WKH RYHQ LQ WKH PLFURZDYH PRGH ZLWKRXW WKH WXUQWDEOH DQG WXUQWDEOH VXSSRUW...

Page 13: ...COOK DEFROST STEAM POPCORN BEVERAGE FAMILY SNACKS POTATO MELT REHEAT KHFN WKH RQYHQLHQFH XLGH EHIRUH RX EHJLQ Press Enter COOK Amount of cooking time DEFROST Time Weight or 1 lb Quick Defrost SETTINGS Help Clock Settings Turntable On Off Auto Night Light Beeper Volume Display Speed Display Language Timer Kitchen Timer Settings POWER LEVEL Power level 1 to 10 ADD 30 SEC Starts immediately EXPRESS C...

Page 14: ...selection 5 Press Start Continued next page DVM1950 JNM1951 JVM1950 PVM1970 PNM1971 PVM2170 1 Press MyPlate gov pad 2 Turn the dial to display the food group you want See Cooking Guide for MyPlate gov press the dial to select 3 Turn the dial again to display the specific food you want then enter the amount if prompted 4 Press dial to select 5 Press the dial or the Start Pause button to begin cooki...

Page 15: ...ls 6 Peas 1 Frozen 2 Canned 7 Potatoes 1 Baking 2 Sweet 8 Spinach 1 Fresh 2 Frozen 3 Canned 3 Ground Meat 4 Poultry 1 Bone In Chicken 2 Boneless Chicken 5 Seafood 1 Whitefish 2 Tilapia 3 Salmon Cooking Guide for MyPlate gov Note Bold code numbers do not apply to Model PVM2170 The Turn To Select dial is used to select appropriate food group Note for Sensor Cooking For best results do not open the d...

Page 16: ... 16 Front View Control Panel Assembly Removed Component Locator Views Continued next page Cooling Fan Turntable Coupling Control Panel Assembly Front View Vent Grille Bottom TCO ...

Page 17: ... Fuses Magnetron TCO Diode Magnetron Cooling Fan Motor Cooling Fan High Voltage Transformer Bottom TCO View From Right Side High Voltage Capacitor View From Top Right Side Vent Motor Capacitor Fuses High Voltage Capacitor ...

Page 18: ...ent TCO To Gas Sensor To T T Motor Cooktop Lamp Cooling Motor and Secondary Interlock Switch 2 To Touch Pad Ribbon Connector To Smart Board To Vent Motor To Zero Standby Switch and Secondary Interlock Switch 1 Power L Relay Power H Relay To Display PCB To Vent Cooktop Lamp Tact Switch and Encoder Switch ...

Page 19: ...TXLYDOHQW WR HSWK RI DELQHW 5HFHVV 6HOI OLJQLQJ 6FUHZ 7KLV GLVWDQFH FDQ 127 H FHHG µ WR HQVXUH SURSHU LQVWDOODWLRQ Grille Assembly To remove the grille assembly 1 Open the microwave oven door 2 Remove the 2 Phillips head screws from the top front of the oven cabinet 3 Slide grille assembly to the left and pull out The bottom of grille is held in place with 2 tabs Note The tabs must be inserted whe...

Page 20: ...ad screws from the back of the oven Outer Cover To gain access to many of the microwave oven components it is necessary to remove the outer cover WARNING To prevent electrical shock use extreme caution when diagnosing oven with outer cover removed and power ON The high voltage section of the power supply including filament leads has the potential with respect to ground to reach 4000 Volts To remov...

Page 21: ... 4 MW CM Door Assembly Removal To remove the door assembly remove the hinge clip by gently prying it straight out with a small flat blade screwdriver Door Assembly The door comes as an entire assembly although the door handle can be obtained separately Lift door to disengage upper and lower door hinge the pins from the hinge arms Hinge Clip Continued next page ...

Page 22: ...en to contact the bulb with your fingers carefully clean the quartz surface with a gentle solvent such as alcohol To disassemble the door 1 Place the door face down on a protective surface 2 Using a putty knife carefully pry the choke cover away from the door frame 3 Remove the Phillips head screw from the bottom left corner that fastens the bottom of the oven door handle 4 Using a flat blade scre...

Page 23: ... to be recharged every few days It is recommended that once a week the microwave oven be left powered on by not using the Power Saver Energy Saver feature for at least 24 hours If prompted to enter the time of day when powering the microwave oven on from the Power Saver Energy Saver mode the microwave oven should have been powered on for at least 48 hours When the microwave oven is first installed...

Page 24: ...ve Turn the stirrer cover counterclockwise to open The stirrer assembly will then drop down To reinstall place in position and turn clockwise to lock in place Stirrer Assembly Retainer Power Saver Battery The rechargeable power saver battery is mounted in a plastic holder that is mounted to the grille just above the control panel assembly See Control Panel Assembly The power saver battery is conne...

Page 25: ...nd is common to all functions and door switches To remove the fuse 1 Disconnect power to the microwave oven 2 Remove grille assembly See Grille Assembly 3 Remove control panel vent plate 4 Remove the control panel assembly See Control Panel Assembly 5 Remove the fuse See photo below High Voltage Fuse The unit is equipped with a 20 amp high voltage transformer fuse Part WB27X10928 The fuse is locat...

Page 26: ...oor 3 Remove the grille assembly See Grille Assembly 4 Remove the Phillips head screw that attaches the control panel assembly to the oven 2 Remove the Phillips head screw from the top of the oven and the 2 Phillips head screws from the rear of the oven View From Rear 3 Lift the vent blower cover to expose the vent blower assembly 4 Lift the vent blower assembly straight up rotate it left and set ...

Page 27: ...ch The monitor switch is operated indirectly by the bottom latch pawl The pawl operates a cam switch which in turn activates the monitor switch The monitor switch is intended to render the oven inoperative by blowing the monitor fuse when the contacts of the primary interlock switch and power relay fail to open when the door is opened Functions When the door is opened the monitor switch is closed ...

Page 28: ...he control board frame then lift the smart board off the frame Ribbon Connector 2 Remove the two T 20 Torx screws that attach the door switch bracket to the microwave oven frame and remove the door switch mounting block 3 Using a small flat blade screwdriver gently lift the tab enough to remove the door interlock switches from the door switch mounting block Disconnect Disconnect Disconnect Monitor...

Page 29: ...tom TCO s contacts open at approximately 284 F An open bottom TCO may indicate that a thermal event had taken place on the cooktop below To remove the bottom TCO 1 Remove the control panel assembly See Control Panel Assembly Note Both the insulated and non insulated wire terminal ends have locking tabs The insulated wire terminal end can be removed by inserting a small flat screwdriver between the...

Page 30: ...solvent such as alcohol 2 Carefully remove the defective halogen bulb s then using gloves or a cloth to hold it carefully replace the defective bulb s Turntable Motor The turntable motor is located on the bottom of the microwave oven The motor operates on 21 VAC To remove the turntable motor 1 Remove 6 Phillips head screws from the bottom of the microwave oven cabinet 2 Disconnect the turntable mo...

Page 31: ...nnect Disconnect Disconnect Magnetron WARNING Prior to servicing the magnetron be certain the capacitor is discharged Manually discharge it by placing an insulated handle screwdriver between the diode connection on the capacitor and the oven chassis ground To remove the magnetron 1 Remove the outer cover See Outer Cover 2 Disconnect wiring to the magnetron 3 Remove the 2 Phillips head screws that ...

Page 32: ...the terminal end on the locking tab side Depress the locking tab with the tip of the screwdriver to unlock from the terminal while pulling electrical wire end off the terminal Vent Thermal Cut Out TCO The vent TCO is attached to the magnetron cooling fan motor mounting bracket The contacts close at approximately 158 F and open at approximately 104 F To remove the vent TCO 1 Remove the control pane...

Page 33: ...cket to the base 4 Disconnect the wiring to the cooling fan motor and the vent TCO Cooling Fan Motor The cooling fan motor is located on the right side of the microwave oven To remove the cooling fan motor 1 Remove the control panel assembly See Control Panel Assembly 2 Remove the outer cover See Outer Cover 3 Disconnect wiring to the primary connection of the high voltage transformer View From Ri...

Page 34: ...e screw head closest to the capacitor to ensure ground metal contact To remove the capacitor and diode 1 Remove the outer cover See Outer Cover 2 Disconnect the wiring to the high voltage capacitor 3 Remove the Phillips head screw that attaches the capacitor and diode to the oven and remove the high voltage capacitor 4 Disconnect the diode from the high voltage capacitor Diode Disconnect Disconnec...

Page 35: ...r between the diode connection on the capacitor and the oven chassis ground To remove the high voltage transformer 1 Remove the outer cover See Outer Cover 2 Disconnect wiring to the high voltage transformer View From Right Side 3 Remove 6 Phillips head screws from the bottom cover of the microwave oven cabinet 4 Remove 4 Phillips head screws that attach the high voltage transformer to the bottom ...

Page 36: ... Pause and Back pads at the same time for at least 3 seconds To Exit Demo Mode follow the same steps as above To enter Demo Mode for the 1 9 Series microwave models 1 Unplug unit or turn off power for at least 3 minutes 2 Restore Power 3 Within 30 seconds press and hold the Power Level and 0 pads at the same time for at least 3 seconds To Exit Demo Mode follow the same steps as above ...

Page 37: ... 37 Troubleshooting PCB ...

Page 38: ...mine cause Instruct owner not to use oven if it has not been brought into compliance Oven Performance Test 1 Measure line voltage loaded This is based on normal voltage variations of 108V to 132V Low voltage will lower output power and temperature rise 2 Place WB64X73 do not use any other load or dish as results will vary from standard beaker containing one liter of water 1000 ml 59 F 75 F on turn...

Page 39: ...r Pin Voltage CN101 1 0 5 25 V CN102 1 4 75 5 2 V 2 0 5 25 V 2 4 75 5 25 V 3 0 5 25 V 3 GND 4 0 5 25 V CN301 1 4 75 5 25 V 5 0 5 25 V 2 0 5 25 V 6 0 5 25 V 3 GND 7 0 5 25 V 4 4 75 5 25 V 8 0 5 25 V CN402 1 9 6 14 4 V 9 0 5 25 V 2 Not Connected 10 0 5 25 V 3 0 14 4 V 11 0 5 25 V 4 0 5 25 V 12 0 5 25 V 5 GND 13 0 5 25 V CN901 1 0 3 1 V 14 0 5 25 V 2 GND 15 0 5 25 V 3 GND 16 0 5 25 V Control Performa...

Page 40: ...closed Some Door open 0 c Remove the 20 amp fuse the circuit must open If not check the wiring of the monitor and interlock switch circuits 7 After the test remove the temporary jumper leads from the interlocks and relay Reconnect the monitor switch leads and reinstall the fuse 8 Replacement of any parts in monitor circuit requires repeating this entire test procedure The switch housing is not adj...

Page 41: ...est 1 Place ground meat in oven 2 Touch MyPlate gov and select Ground Meat by selecting number pad 3 3 Press Start 4 Control beeps and shuts off 5 Touch Cancel Off A Test OK Normal B Test Fails Check Sensor See Sensor Test below Sensor Test Quick Test 1 With two fingers touch and hold the following pads simultaneously 7 and 8 2 Observe diagnostic number on the display numbers approximate 15 185 no...

Page 42: ...bon Use high Ω scale Pad Connection Pad Connection DVM1950 JVM1950 PVM1970 DVM1950 JVM1950 PVM1970 Reheat 7 10 1 6 12 Popcorn 9 11 2 5 12 Family Snacks 5 11 3 4 12 Time Cook 9 12 4 3 12 Defrost 8 12 5 2 12 Power Level 4 13 6 9 13 Start Pause 3 13 7 8 13 Cancel Off 2 13 8 7 13 Settings 6 14 9 6 13 MyPlate gov 6 15 0 5 13 Add 30 Sec 2 14 Timer 7 15 Steam 2 15 Ribbon Cable JVM1950 Soften 3 14 DVM1950...

Page 43: ... 43 Schematics and Wiring Diagrams Continued next page PVM2170 Schematic Diagram ...

Page 44: ... 44 PVM2170 Wiring Diagram Continued next page ...

Page 45: ... 45 DVM1950 JNM1951 JVM1950 PVM1970 PNM1971 Schematic Diagram Continued next page ...

Page 46: ... 46 DVM1950 JNM1951 JVM1950 PVM1970 PNM1971 Wiring Diagram ...

Page 47: ...e transformer for a complete circuit This half cycle of the AC charges the capacitor to approximately 2000 VDC During the second half cycle of operation the current flows in the opposite direction and again supplies 2000 VDC to the circuit This allows the capacitor to discharge its 2000 VDC on top of the 2000 VDC generated by the secondary winding creating an approximate total voltage of negative ...

Page 48: ... is located in an area where service by a GE Authorized Servicer is not available you may be responsible for a trip charge or you may be required to bring the product to an Authorized GE Service Location for service In Alaska the warranty excludes the service calls to your home Some states do not allow the exclusion or limitation of incidental or consequential damages This warranty gives you speci...

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