MHC-1 Service Manual
5
TROUBLESHOOTING GUIDE (CONT’D)
Display reads
unusual characters
Make sure wires are connected properly
(grounded).
If wires are grounded properly, new control board
is needed.
On/Off switch doesn’t
light (but unit works
properly)
Power Switch
Check wiring to switch.
HEAT SHELF – REPLACEMENT
1.
Disconnect
power.
2. Take out screws holding “L Brackets” in cavity.
3. Disconnect thermocouple and all power connections to board. Mark all wires for reassembly.
4. Take out power board.
5. Take out shelf mounting screws from both sides.
6. Remove shelves and feed wiring out of unit.
7. Reassemble in reverse order.
CONTROL BOARD – REPLACEMENT
1. Remove four (4) screws.
2. Disconnect ribbon cable.
3. Remove
board.
4. Reassemble in reverse order.
WARNING:
Be careful to avoid tearing the aluminum foil while working with wire
connections.
!
!
When replacing U.I. board, be sure ribbon
cable is connected so that blue wire is
facing towards interior of unit.
