Troubleshooting Cooking Loads In Service Mode - GE JS998 Series Technical Service Manual

Troubleshooting Cooking Loads in Service Mode

Cooking loads (bake, broil, convection elements and convection fan) can be energized individually
:
through 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 the
fan is turning. If load is not energized, check AC relay voltages according to the second column in the
following tables:
Note: Oven must be in the service mode for proper reading. DC voltages are read between the
reference pin in the table and ground. See note below table.
RELAY CONTROL TABLE - SINGLE WALL OVEN
SERVICE MODE
Function
Right Cooling Fan
R CoolingFan -> On/Off
Left Cooling Fans
Mag Stirrer
Mag Fan
HVT Fan
L CoolingFans -> On/Off
Oven Light
Ovenlight -> On/Off
Microwave
CookingLoads -> MW
Vent Fan
VentFan -> On/Off
Convection Element
CookingLoads -> ConvElem
Convection Fan
Clockwise
CookingLoads
-> ConvFan -> CW
Convection Fan
Counter Clockwise
CookingLoads
-> ConvFan -> CCW
Broil Element
CookingLoads -> Broil
Bake Element
CookingLoads -> Bake
Bake2 Element
CookingLoads -> Bake2
Door Latch
DoorLatch -> Lock/Unlock
Note : Ground reference for dc voltage measurements
is J3-2 or J3-4 on MPB or J5-2 or J5-4 on MLB
AC VOLTAGES
Main Pwr Board Relay
Relay Control
ON=120VAC (L1-N or L2-N)
ON = 0Vdc
or 240VAC (L1-L2)
OFF = 12Vdc
OFF=0V
MPB J1-10
L2 = J4-8 (K1-NO)
MLB J3-10
N = J103
MPB J1-9
L2 = J4-7 (K5-NO)
MLB J3-9
N = J103
MPB J1-4
L1 = J4-5 (K13-NO)
MLB J3-4
N = J103
HVT T2 = L2 = J107 (K9-NO)
OR
HVT T3 = L2 = J105 (K9-NC)
HVT T1 = L1 = J114
MPB J1-3
L2 = J4-9 (K106-NO)
MLB J3-3
N = J103
L1 = K10-NO
L2 = K102-NO (DLB)
MPB J1-16 OFF
L1 = J4-2 (K105-NC)
MLB J3-16 OFF
N = J103
MPB J1-16
L1 = J4-3 (K105-NO)
MLB J3-16
N = J103
L1 = K7-NO
L2 = K11-COM (DLB)
L1 = K8-NO
L2 = K11-COM (DLB)
MPB J1-18
L1 = J113 (K103-NO)
MLB J3-18
L2 = K11-COM (DLB)
MPB J1-14
L1 = J4-1 (K2-COM)
MLB J3-14
N = J103
MPB = Main Power Board
MLB = Main Logic Board
– 35 –
DC VOLTAGES
Relay Control
Enable = 4.2Vdc
ON = 4.6Vdc
Disable = -14.0Vdc
OFF = -14Vdc *
MPB J1-17
MLB J3-17
MPB J1-1
K6 (Mag Main Relay) must be energized
OR
MLB J3-1
MPB J1-17 OFF
MLB J3-17 OFF
Note: MagTap is automatically selected
MPB J1-8 MPB J1-1
MLB J3-8 MLB J3-1
MPB J1-12
MLB J3-12
MPB J1-6 MPB J1-1
MLB J3-6 MLB J3-1
MPB J1-11
MLB J3-11
MPB J1-7 MPB J1-1
MLB J3-7 MLB J3-1
MPB J1-11
MLB J3-11
MPB J1-1
MLB J3-1
MPB J1-11
MLB J3-11
* OFF = 0Vdc if Disable = -14Vdc
Notes
Fan comes on when entering the
cooking loads menu.
Fan comes on when entering the
cooking loads menu.
MPB J1-5 ON (4.6Vdc)
MLB J3-5 ON (4.6Vdc)
by Line Voltage
Fan comes on when entering the
cooking loads menu.
K4 (Convection Fan Relay) must be
energized
MPB J1-15 ON (0Vdc)
MLB J3-15 ON (0Vdc)
K4 (Convection Fan Relay) must be
energized
MPB J1-15 ON (0Vdc)
MLB J3-15 ON (0Vdc)
Broil element must be turned off
Broil element must be turned off