Knight UniTech Warewash, Instruction Manual

Page: 15 / 24

0900591 Rev: A (07/04) Page 15 of 24
CHANGING THE CIRCUIT BOARD
(1) Ensure that power to the unit is off.
(2) Loosen the two screws and swing the cover open.
(3) Remove mounting screw from the center of the
circuit board. Disconnect wiring harnesses and all
remaining wires that attach the circuit board to the
terminal strip. Note the location of wires for later.
(4) Gently push up on the two upper mounting tabs
while pulling the circuit board away from the cover.
Once the top is loose, the bottom will pull away
freely from the lower tabs.
Jumper Settings
The circuit board has shunt jumpers that must be set
according to the transformer configuration of your
UniTech system (diagram to the right shows jumper
locations). This is particularly important when changing
circuit boards so the new board will work correctly.
(5) Replace with new circuit board and carefully line up
the buttons and LED’s with the holes on the cover.
Snap the board into place on the upper and lower
mounting tabs. Set the jumpers per table below.
(6) Re-connect all wires to the terminal strip (that were
disconnected in step 3) and re-connect the wiring
harnesses. Replace the mounting screw.
(7) Carefully tuck all wires in while closing the cover.
Tighten the cover screws.
(8) Process complete! Now ready to be powered up.
Transformers JP1 JP2 JP3 JP4
Single (1) xfmr OFF OFF ON ON
Dual (2) xfmrs ON ON OFF OFF
JP1
JP2
JP3
JP4
UNITECH CIRCUIT BOARD