Maintenance 7-0
Revision 2 - 20 March, 1997 HP SERIES DIMMER OPERATING MANUAL
7.0 Maintenance
WARNING
DO NOT ALLOW THE ENTRY OF LIQUIDS OF ANY SORT INTO THE
DIMMER CHASSIS.
EXTERNAL CLEANING:
If the front panel requires cleaning, wipe with a mild detergent on a damp soft cloth.
DO NOT spray liquids onto the front panel.
DO NOT use solvents for cleaning the front panel.
INTERNAL CLEANING:
The HP12 dimmers will require little internal maintenance other than periodic
flushing of dust build to prevent the fan and air-path becoming clogged with dirt or
fluff.
• ISOLATE POWER to the dimmer (by disconnecting the power cable or locking
off the mains supply isolator).
• Remove the lid (rack-mount) or right-hand panel (wall-mount).
• Blow clean the fan and internals with compressed air from left to right (rack-
mount) or from top to bottom (wall-mount).
• DO NOT "spin" the fan with compressed air - the blades may break off.
• When the fan and internals are clean, replace the lid and screws, and re-connect
the power cable.
ROUTINE MAINTAINANCE:
Installed dimmers should be routinely flushed of dust at six- to twelve-month periods.
Touring dimmers may need a more rigorous maintenance routine, which should
include:
• Inspection of chassis for evidence of impact damage and physical abuse
• Inspection of outlets for wear and damage
• Inspection of power cable for wear and damage
• Electrical checking of ground integrity from power cable to chassis
• Electrical checking of ground integrity from power cable to outlet grounds
• Flushing of dust buildup
• Testing the operation of all frontpanel switches and breakers
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