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Preventive Maintenance
CSA 803A Service Manual
6Ć3
Interior
Cleaning should seldom be necessary. To clean the interior, blow off the
dust with dry, lowĆvelocity air (approximately 5 lb/in@). Remove any dirt that
remains with a soft brush or a cloth dampened with a mild detergent and
water solution. A cottonĆtipped applicator is useful for cleaning in narrow
spaces, or for cleaning more delicate circuit components. After cleaning,
use a washcloth dampened with water to remove any residue.
CAUTION
Circuit boards and components must be dry before applying power
to prevent damage from electrical arcing.
The highĆvoltage circuits should receive special attention. ExcesĆ
sive dirt in these circuits may cause highĆvoltage arcing and result
in improper instrument operation.
The instrument should be inspected occasionally for defects such as broken
connections, improperly seated semiconductors, damaged or improperly
installed circuit boards, and heatĆdamaged parts. The corrective procedure
for most visible defects is obvious; however, particular care must be taken if
heatĆdamaged parts are found. Since overheating usually indicates other
trouble in the instrument, correcting the cause of overheating is important to
prevent the damage from reoccurring.
To ensure accurate measurements, check the electrical adjustment of this
instrument after each 2,000 hours of operation, or every 24 months if used
infrequently.
Visual Inspection
Periodic Electrical
Adjustment