Installation guide

Appendix F – Preventative Maintenance 120
$SSHQGL[) – 3UHYHQWDWLYH0DLQWHQDQFH
The CPU on the Duo Hardware module is designed to throttle down in speed or even re-boot in the event of
overheating in order to protect the unit from damage. The main cause of system overheating is either excessive dust
build up or failure of the CPU fan.
Duo CPU Module
It is highly recommend that approximately every six months you should perform the following procedure:
1. Turn off the Duo CPU module with the power switch and remove the power cord.
2. Clean the Duo CPU Module by blowing out any dust that has accumulated. You can use either an air
compressor, or a can of compressed air, which should be available from your local electronics store. DO
NOT use any solvents or any other cleaning products on the Duo CPU Module. DO NOT open the Duo
CPU module, there are no user serviceable parts inside.
3. Plug in the power cord and turn the unit on.
Duo Camera Module (If fitted)
It is highly recommend that approximately every six months you should perform the following procedure:
1. Remove the top cover. (There is no need to remove the entire module)
2. Pull out the LLAN In plug to turn the Duo Unit Off.
3. Clean the Duo Camera Unit by blowing out any dust that has accumulated. You can use either an air
compressor, or a can of compressed air, which should be available from your local electronics store. DO
NOT use any solvents or any other cleaning products on the Duo Camera Unit.
4. Clean any dust away from the Camera Lens by using a clean, dry, soft cloth. Do not move the camera or
you will then need to re-configure the camera.
5. Replace the top cover and check that the scoring operation is still OK.