GE JES2251SJ Technical Service Manual

Also see for Profile JES2251SJ: Owner's manual Datasheet Datasheet

Contents

188.5. Inverter power supply (U)DO NOT try to repair H.V. Inverter Power Supply (U).Replace complete H.V. Inverter(U) Unit.DANGER HIGH VOLTAGETest if failure codes of H97 or H98 appear by doingthe following procedure. It is recommended to usean AC line input current Ampere meter for testing.Test11. Program DPC.a. Tap Clock keypadb. Tap Timer keypadc. Tap Start keypadd. Tap Power Level keypad2. Place 1 liter of water load into oven cavity.3. Unplug 2 pin H.V. lead wire connector CN703 frommagnetron tube.4. Program oven at High power for 1 minute andpress start.a. After approximately 23 seconds, oven stops.b. During oven operation, input current isapproximately 0.5 to 1A. If both a and b are OK,proceed to test 2.!! INPUT AMPERE! FAILURE CODE! Unplug CN703! 0.5 to 1A! Oven stops in 23 !!!! seconds after started.Test2Continued from Test 11. Unplug 3 pin connector CN701. CN703 remainsunplugged.2. Program oven at High power for 1 minute and pressstart.a. After approximately 3 seconds, oven stops.b. During oven operation, input current isapproximately 0.4A.!! INPUT AMPERE ! FAILURE CODE! Unplug CN701! <0.4A! Oven stops in 3 !!!! seconds after started.If both a and b check OK, the Inverter Power Supply (U)can be determined to be OK.HEAT SINK IGBTCHOKE COILRECTIFIER BRIDGEH I G H V O LTA G ETRANSFORMERCN702DO NOTADJUST VR701S A N D B A RRESISTORCN701SHORT FOR DISCHARGING HIGHVOLTAGE CHARGE REMAINS INHIGH VOLTAGE CAPACITORSHIGH VOLTAGECAPACITORSHIGH VOLTAGE CHARGEREMAINS IN HIGHVOLTAGE CAPACITORSDO NOT TOUCHCN703HIGHVOLTAGEDIODESSECONDARYWINDINGSFILMCAPACITORSP R I M A R YWINDINGSDANGER OF HIGH VOLTAGEAND HIGH TEMPERATUREHOT/LIVE OF HEAT SINK