Proface PS4800 - 19 Panel PC" - Manual (Page 129)

Maintenance
129
Replacing the Fan Filter
The fan filters are subject to wear, and should be checked with appropriate
frequency to determine whether the air flow provides sufficient cooling. An exchange
or cleaning of the filter kit is appropriate at that time.
The table below shows how to replace the fan filter:
WARNING
IMPROPER BATTERY CAN PROVOKE FIRE OR EXPLOSION
Replace battery only with identical type: Type CR2477N.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Read and understand the safety information in the Regular Cleaning and
Maintenance section (see page 125) before attempting this procedure.
Failure to follow these instructions will result in death or serious injury.
Step Action
1 Disconnect the power cord to the PS-B unit.
2 Touch the housing or ground connection (not the power supply) to discharge
any electrostatic charge from your body.