Appliance Diagnostic Modes Microwave. GE Consumer & Industrial Technical Training
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1 Appliance Diagnostic Modes Microwave GE Consumer & Industrial Technical Training
2 Range Table of Contents General Microwave JVM230/240/250B Series (# ) JVM2070 Series (# ) ZMC3000B Series (# ) SCA1000 Series (# ) SCA2000 Series (# ) SCB2000 Series (# ) JS998/JT930/JT980/ZET3038/ZET3058 Series (# ) 2 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
3 Microwave F Codes Counter top & OTR microwave ovens produced since the Fall of 1995 have fault codes. However, mini manuals do not list these codes. You can see a listing of these F codes on Service Bulletins RA7-95 & RA7-97. F0 = Open or shorted humidity sensor at the start of cooking program F1 = Open thermal sensor, due to excessive heat in the m/w cavity F2 = Shorted thermal sensor F3 = Shorted key panel F4 = Open Humidity sensor during cooking process F5 = Shorted Humidity sensor during cooking process F6 = Shorted temperature probe PROBE = Open temp probe or the probe is not plugged in during a temp cook function Temp probe is 50,000Ω at room temp. 3 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
4 Microwave Performance Test Measure line voltage (loaded). This test is based on normal voltage variations of 105VAC to 130VAC. Low voltage will effect power & temperature rise. Place beaker (WB64X73) containing exactly 1 liter of water between 59 0 & 75 0 in the center of the shelf. Record the starting water temperature with an accurate thermometer. Set on HIGH power. Turn unit on for exactly 2 minutes 3 seconds. Remove carefully the beaker after the time has run out & record the water temperature normal temperature rise should be 28 0 at 120VAC & 25 0 at 105VAC. 4 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
5 5 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
6 Microwave Keypanel Test 6 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
7 Microwave Door Switches 7 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
8 Microwave Door Switch Assembly 8 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
9 9 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
10 10 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
11 11 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
12 Thermal Cutouts Oven TCO (flame sensor) - if OTR will not operate - DO NOT replace without checking for cause. Bottom TCO - if fire on cooktop this prevents vent from turning on. MagTube TCO - opens if air flow blocked to prevent failure of Mag. Hood TCI - will keep smart board from overheating when surface units are on for long periods. 12 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
13 HV Power Supply The mag tube requires a high DC voltage source (4000VDC). This voltage is supplied by a half-wave voltage doubler circuit. The 2000V secondary winding is connected to the capacitor & diode. The capacitor increases the voltage to 3600V, due to its peak voltage charging capabilities. The diode voltage, & the resultant half-wave DC voltage is applied to the mag tube. The negative output from the DC circuit is connected to the filament of the mag tube. The positive output is connected to the plate of the mag tube, which is grounded to chassis. 13 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
14 HV Power Supply The diode is therefore connected with opposite polarity from the mag tube in order that the capacitor will charge through the diode during one-half cycle & will discharge through the mag tube on the alternate half-cycle. On the discharge cycle, the capacitor aids the transformer voltage, thereby providing the voltage doubling action. 14 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
15 HV Power Supply Test To check for HV circuit operation, put control board in test position. Place a load inside microwave & set time for 1 minute. Once microwave shuts off after the minute, place 2 screwdrivers across HV capacitor terminals to see if you get a spark. If the is a spark, the HV circuit is working. If there is no spark, the HV circuit is not working & you will need to check the diode, capacitor, and HV transformer. Diode 15 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
16 Diode Operation 16 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
17 Diode Bias 17 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
18 Microwave Diode Test 18 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
19 19 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
20 Microwave Diagnosis Chart A Is the Display lit? YES THESE ITEMS ARE OK NO CHECK THESE ITEMS Voltage Fuse Thermal cutouts magnetron, cavity, flame, etc. Low voltage transformer Control Voltage Fuse Thermal cutouts magnetron, cavity, flame, etc. Low voltage transformer Control B Can you program the microwave? (Do keypads respond?) YES THESE ITEMS ARE OK Key panel/ Control NO CHECK THESE ITEMS Key panel/ Control C Is the light on when you press START? YES THESE ITEMS ARE OK Key panel/ Control Door switches Power control module NO CHECK THESE ITEMS Key panel/ Control Door switches Power control module D Is the fan on when you press START? YES THESE ITEMS ARE OK Key panel/control Door switches Power control module NO CHECK THESE ITEMS Key panel/control Door switches Power control module 20 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
21 Microwave Diagnosis Chart E Is there 120VAC at high voltage transformer? YES THESE ITEMS ARE OK Input amps at CMO fuse or line cord more than 1A. NO CHECK THESE ITEMS Input amps at CMO fuse or line cord less than 1A. Refer to schematic likely causes are door switch, relay, or high voltage transformer. F Transformer primary YES THESE ITEMS ARE OK If there is more than 1A at CMO fuse or line cord, the low voltage circuit is functional & providing voltage to the high voltage transformer. NO CHECK THESE ITEMS Less than 1 (or 0)A at CMO fuse or line cord. Check for 120VAC to transformer primary & continuity of high voltage transformer primary. G Transformer secondary/filament YES THESE ITEMS ARE OK 9 to 14A at CMO fuse or line cord. 1 to 5A at CMO fuse or line cord & 9 to 14A at magnetron leads. NO CHECK THESE ITEMS 1 to 5A at CMO fuse or line cord. 1 to 5A at CMO fuse or line cord & 0A at magnetron leads. Open in high voltage circuit. Check magnetron, capacitor, & transformer for continuity. 21 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
22 Microwave Diagnosis Chart H - Capacitor YES THESE ITEMS ARE OK 9 to 14A at CMO fuse or line cord. 1 to 5A at CMO fuse or line cord and 9 to 14A at magnetron leads. NO CHECK THESE ITEMS More than 14A, blows fuse & makes loud hum capacitor shorted. 1 to 5A at CMO fuse or line cord & 0A at magnetron leads. Open in high voltage circuit. Check magnetron, capacitor, & transformer for continuity. I Rectifer/Diode YES THESE ITEMS ARE OK 1 to 5A at CMO fuse or line cord & 9 to 14A at magnetron leads. NO CHECK THESE ITEMS 1 to 5A at CMO fuse or line cord & 9 to 14A at magnetron leads check for open diode. 1 to 5A at CMO fuse or line cord & 9 to 14A at magnetron leads. YES THESE ITEMS ARE OK J - Magnetron Low amps at CMO fuse, high amps at magnetron leads noisy operation. Check for shorted diode. NO CHECK THESE ITEMS 1 to 5A at CMO fuse or line cord & 9 to 14A at magnetron leads. 1 to 5A at CMO fuse or line cord & 9 to 14A at magnetron leads. More than 14A, blows fuse & makes loud hum magnetron shorted or grounded. 1 to 5A at CMO fuse or line cord & 0A at magnetron leads. Open in high voltage circuit. Check magnetron, capacitor, & transformer for continuity. 22 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
23 Microwave Diagnosis Chart Other items of importance Normal amps, no cook. Slow cooking. Door adjustment. Erratic operation. Blows fuse intermittently. Check stirrer motor. Listen for change in sound 1 to 2 seconds after start. Use performance test, failure indicates magnetron. Always check voltage as part of test. Perform microwave leak test. Look for overheating verify overload is shutting system down. Check primary transformer amps more than 5A could indicate transformer failure. Check door switches for proper operation Is there foreign matter present that could cause them to stick? 23 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
24 Microwave Diagnostic Flowchart START Is the Display Lit? Operate Oven Load Yes No Check Voltage, Fuse, TCOs, LV Xfmr, & Control Cold Warm Hot Run Performance Test Light/Fan On? Stirrer OK? No Yes Replace Stirrer Replace Magnetron No Yes Check HV Circuit Check LV Circuit 24 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
25 Magnetron Flowchart 25 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
26 26 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
27 JVM230/240/250B Series 27 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
28 JVM230/240/250B Series 28 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG20)
29 JVM230/240/250B Series 29 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG21)
30 JVM230/240/250B Series 30 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG23)
31 JVM230/240/250B Series 31 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG23)
32 32 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG23)
33 JVM230/240/250B Series 33 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG24)
34 JVM230/240/250B Series 34 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG26)
35 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
36 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG21)
37 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG21)
38 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG22)
39 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG23)
40 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG23)
41 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG25)
42 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG25)
43 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG25)
44 44 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG27)
45 JVM GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG29)
46 Convection Microwave ZMC3000B 46 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
47 ZMC3000B Use Ohmmeter set on a high scale Read continuity between connections per chart 47 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG12)
48 ZMC3000B 48 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG17)
49 ZMC3000B 49 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG17)
50 ZMC3000B 50 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG18)
51 ZMC3000B 51 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG18)
52 Performance Test Measure line voltage (loaded). This test is based on normal voltage variations of 105VAC to 130VAC. Low voltage will effect power & temperature rise. Place beaker (WB64X73) containing exactly 1 liter of water between 59 0 & 75 0 in the center of the shelf. Record the starting water temperature with an accurate thermometer. Set on HIGH power. Turn unit on for exactly 2 minutes 3 seconds. Remove carefully the beaker after the time has run out & record the water temperature normal temperature rise should be 28 0 at 120VAC & 25 0 at 105VAC. 52 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
53 ZMC3000B 53 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
54 54 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
55 ZMC3000B 55 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG27)
56 ZMC3000B 56 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG28)
57 Advantium SCA GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE
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97 Advantium SCB GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG52)
98 98 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE 2004 Trivection Technology Cooking
99 99 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG39)
100 Trivection 100 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG39)
101 Trivection Voltage Checks To turn off all loads that are energized in Cooking Loads, press CLEAR/OFF key or exit the Cooking Loads menu If load is not turned off, additional loads can be turned on at the same time If ACV measures OK, then check the load (element, fan, lock, motor, HVT, etc.) &/or wiring to the load & repair/replace as required If there is no ACV supplied to the load through the power relays per wiring schematic, then check the DC power supply voltages from the MPB (J3 connector) to the MLB (J5 connector) according to the following table. 101 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG38)
102 Trivection DC Power Supply Voltage Chart 102 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG38)
103 Trivection Voltage Checks If voltages do not measure according the the table above, replace MPB. If voltages measure OK, then measure DCV according to the relay control table (see pages 35, 36, & 37). If the MLB J3 pins do not provide correct DCV, then replace MLB. If the display is blank, the oven light does not operate when the door is opened, & the keypanel does not respond, first check DC power supply voltages. Next, check DCV at MLB J2 (pins 2, 4, 6, & 8). They should be +12VDC. If not, replace text display &/or time/temp display. If DC power supply voltages are OK, the display is blank, & the keyboard is not responding, replace MLB. If just the display is blank, replace the display. If only the keyboard is not responding, check glass touch display. If OK, replace MLB. If oven light does not turn on when door is opened, check oven light relay per relay troubleshooting table. If relay voltages are OK, check door sense switch (page 24). 103 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG38)
104 Service Mode Disconnect main power to the oven for at least 15 seconds. Reconnect power & enter 0803 on the keypanel within 5 minutes after the control initializes. The SPECIAL MODES screen is displayed. Press the SERVICE pad on the screen. The SERVICE MODE screen is displayed. Press the NEXT & BACK pads to scroll through the test list, choose a test by pressing the appropriate pad. 104 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG34)
105 Service Mode Screen 105 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG34)
106 Service Mode Test Screen 1 COOKING LOADS: verifies proper operation of cooking elements & convection fan (NOTE: there is a 5 second delay). DOOR LATCH: verifies proper operation of door lock motor & switches press the LOCK pad, a red lock icon flashes during lock process, then becomes solid when door is locked - press UNLOCK pad, the red lock icon flashes during unlock process, then turns off when door is unlocked. DOOR POSITION: verifies proper operation of door sense switch open & close door, the Time/Temp display indicates the door is open or closed. RTD: displays oven sensor temp in red on Time/Temp display. VENT FAN: verifies proper operation of vent fan press ON & OFF pads to cycle the fan, the Time/Temp display indicates the fan is on or off. 106 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG34)
107 Service Mode Next Screen 107 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG34)
108 Service Mode Test Screen 2 MAG TAP: forces the control to use either 208 or 240ACV tap on the HVT DO NOT use this service feature at this time, allow the control to select the transformer voltage. R COOLING FAN: verifies proper operation of the right cooling fan press ON & OFF pads to cycle the fan, the Time/Temp display indicates the fan is on or off. L COOLING FAN: verifies proper operation of the mag cooling fan, HVT fan, & mag stirrer fan (WO) or the left cooling fan (SI) - press ON & OFF pads to cycle the fan/s, the Time/Temp display indicates the fan/s are on or off. OVEN LIGHT: verifies proper operation of oven light press ON & OFF pads to cycle the light, the Time/Temp display indicates the light is on or off. 108 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG34)
109 Service Mode Test Screen 3 OFFSET: to adjust the oven calibration offset in bake press INCREASE or DECREASE pads to change cook temp in 1 0 increments up to +/ press CONFIRM pad to set. DISPLAY: verifies operation of display segments press ON & OFF pads to cycle the display test press CLEAR/OFF pad to return display to normal. KEYS: verifies proper operation of keypanel press the number pads on the keypanel to test, each number appears in the Time/Temp display as the corresponding pad is pressed. LINE VOLTAGE: displays line voltage L1-L2 in the upper temp display. F CODES: displays up to the last 7 ERC failure code (NOTE: always check failure codes, then clear them). 109 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG34)
110 Service Mode Test Screen 4 COOKTOP STAT (SI): indicates the on/off status of radiant surface elements, the ON indicator will occur when respective infinite switch hot light is lit. CO SENSOR (Kenmore only): turns the CO sensor & heater on & off. Press EXIT pad to return to the HOME screen. 110 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG34)
111 111 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG32)
112 112 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG32)
113 Trivection 113 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG32)
114 Trivection Troubleshooting Chart 114 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG40)
115 Trivection Troubleshooting Chart Lower Oven DWO Cooktop Slide-in 115 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG41)
116 116 GE CONFIDENTIAL AND PROPREITARY INFORMATION - NOT FOR PUBLIC DISCLOSURE (SG42)
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