GE JS998 Series Technical Service Manual

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GE JS998 Series Technical Service Manual Manual pdf 35 page image

– 35 –:Troubleshooting Cooking Loads in Service ModeCooking loads (bake, broil, convection elements and convection fan) can be energized individuallythrough the service mode (press the key next to COOKING LOADS, then appropriate load).Note: There is a 5-second delay in the electronic control activating cooking loads in service mode.When the appropriate load is turned on in the service mode, first verify that the element is heating or thefan is turning. If load is not energized, check AC relay voltages according to the second column in thefollowing tables:Note: Oven must be in the service mode for proper reading. DC voltages are read between thereference pin in the table and ground. See note below table.AC VOLTAGESSERVICE MODEFunctionMain Pwr Board RelayON=120VAC (L1-N or L2-N)or 240VAC (L1-L2)OFF=0VRelay ControlON = 0VdcOFF = 12VdcRelay ControlON = 4.6VdcOFF = -14Vdc *Enable = 4.2VdcDisable = -14.0Vdc NotesL2 = J4-8 (K1-NO) MPB J1-10MLB J3-10N = J103L2 = J4-7 (K5-NO) MPB J1-9MLB J3-9N = J103L1 = J4-5 (K13-NO) MPB J1-4MLB J3-4N = J103HVT T2 = L2 = J107 (K9-NO)ORHVT T3 = L2 = J105 (K9-NC)MPB J1-17MLB J3-17ORMPB J1-17 OFFMLB J3-17 OFFMPB J1-1MLB J3-1HVT T1 = L1 = J114L2 = J4-9 (K106-NO) MPB J1-3MLB J3-3N = J103L1 = K10-NO MPB J1-8MLB J3-8MPB J1-1MLB J3-1L2 = K102-NO (DLB) MPB J1-12MLB J3-12L1 = J4-2 (K105-NC) MPB J1-16 OFFMLB J3-16 OFFN = J103L1 = J4-3 (K105-NO) MPB J1-16MLB J3-16N = J103L1 = K7-NO MPB J1-6MLB J3-6MPB J1-1MLB J3-1L2 = K11-COM (DLB) MPB J1-11MLB J3-11L1 = K8-NO MPB J1-7MLB J3-7MPB J1-1MLB J3-1L2 = K11-COM (DLB) MPB J1-11MLB J3-11L1 = J113 (K103-NO) MPB J1-18MLB J3-18MPB J1-1MLB J3-1L2 = K11-COM (DLB) MPB J1-11MLB J3-11L1 = J4-1 (K2-COM) MPB J1-14MLB J3-14N = J103Note : Ground reference for dc voltage measurements MPB = Main Power Board * OFF = 0Vdc if Disable = -14Vdcis J3-2 or J3-4 on MPB or J5-2 or J5-4 on MLB MLB = Main Logic BoardRight Cooling FanR CoolingFan -> On/OffLeft Cooling FansMag StirrerMag FanHVT FanL CoolingFans -> On/OffFan comes on when entering thecooking loads menu.Oven LightOvenlight -> On/OffMicrowaveCookingLoads -> MWK6 (Mag Main Relay) must be energizedMPB J1-5 ON (4.6Vdc)MLB J3-5 ON (4.6Vdc)Note: MagTap is automatically selectedby Line VoltageDoor LatchDoorLatch -> Lock/UnlockBroil element must be turned offBake ElementCookingLoads -> BakeBake2 ElementCookingLoads -> Bake2Broil ElementCookingLoads -> BroilBroil element must be turned offDC VOLTAGESK4 (Convection Fan Relay) must beenergizedMPB J1-15 ON (0Vdc)MLB J3-15 ON (0Vdc)Convection FanCounter ClockwiseCookingLoads-> ConvFan -> CCWConvection FanClockwiseCookingLoads-> ConvFan -> CWVent FanVentFan -> On/OffK4 (Convection Fan Relay) must beenergizedMPB J1-15 ON (0Vdc)MLB J3-15 ON (0Vdc)Convection ElementCookingLoads -> ConvElemFan comes on when entering thecooking loads menu.Fan comes on when entering thecooking loads menu.RELAY CONTROL TABLE - SINGLE WALL OVEN