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N. Removal and Replacement of Control Board or Operation Board
When replacing a control board or operation board, follow the precautions below.
CAUTION
1. The control board and operation board are fragile; handle very carefully.
2. The control board and operation board contain integrated circuits, which
are susceptible to failure due to static discharge. It is especially important to
touch the metal part of the unit when handling or replacing the control board
or operation board.
3. Do not touch the electronic devices on the control board or operation board
or the back of the control board or operation board.
4. Do not change wiring and connections.
5. Always replace the whole control board or operation board assembly if it
goes bad.
6. Do not short out power supply to test for voltage.
1. Control Board
1) Move the power switch (GFCI) to the “OFF” position, then turn off the power supply.
Lockout/Tagout to prevent the power from being turned back on inadvertently.
2) Remove the front panel and the control box cover.
3) Disconnect the control board connectors from the control board.
4) Remove the 2 screws and the control board.
5) Install the new control board.
6)
To replace, reverse the above procedure.
2. Operation Board
1) Move the power switch (GFCI) to the “OFF” position, then turn off the power supply.
Lockout/Tagout to prevent the power from being turned back on inadvertently.
2) Loosen the 2 mounting screws on the unit frame, then remove the operation panel
assembly.
3) Remove the screw securing the stay - OP, joint - operation (B), and operation panel
(B).
4) Disconnect the connector for the operation board cable and the cable - operation.
5) Install the new operation board.
Note: Remove the 2.0 mm dia tube (A) from the inside groove of the old board, and
attach the tube (A) to the new board.
6)
To replace, reverse the above procedure.
Note: Make sure the tubes are snug inside the joint - operation (B) and operation panel
(B).