Philips PM3055 Operation Manual page 35

4.1
4.2
4.3
4-1E
PREVENTIVE MAINTENANCE
GENERAL INFORMATION
This instrument normally requires no maintenance, since none of its components is subject to wear. However,
to ensure reliable and trouble-free operation, the instrument should not be exposed to moisture, heat,
corrosive elements or excessive dust. :
REMOVING THE BEZEL AND CONTRAST FILTER (to clean the contrast filter}
Insert a screwdriver in the slot on the upperside of the bezel and gently loose the bezel.
Ease the bezel away from the front panel.
Press the contrast filter from the bezel.
To prevent scratches, when cleaning the filter, always use a clean soft cloth, free from dust and: abrasive
particles.
Figure 4.1 Removing the bezel and the contrast filter.
RECALIBRATION
To ensure accurate measurements, check the calibration of the instrument after specified recalibration
intervals. Recalibration must be carried out by qualified personnel only.