20
(17) Instructions for handling controller board
* Instructions for service engineer
a. Notes
If receiving a service call, ask the user to turn off the power to the unit and turn it again
after 30 seconds. This will reset the controller, and in some cases normal operation will
resume.
b. Servicing
1) Check that the unit has been earthed properly. If not, the controller board will not work
properly.
2) To get static free, always touch the metal part of the unit before servicing. Electrostatic
discharge will cause severe damage to the controller board. Also, keep things that
produce static electricity (e.g. vinyl bag or plastic product) away from controller board.
3) Do not touch the electronic devices on the controller board or the back of the controller
board.
4) Handle the controller board by the edges only. Do not touch the electric parts and
wiring.
5) Do not drop the controller board on the floor. The controller board is fragile.
6) Put controller board on a flat surface and prevent damage to electric parts and devices.
7) Do not pull wires having thin insulation to prevent damage.
8) Do not short the relay output.
9) Do not pull connectors to prevent connectors from coming off of wires from damage.
Check that the connectors are fixed after servicing.
