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1780R-Series Service Manual
6–1
Preventive Maintenance
Preventive maintenance consists of cleaning, visual inspection, performance
checks, and (if needed) readjustment. The preventive maintenance schedule
established for the instrument should be based on the amount of use it receives
and the environment in which it is operated. Under average conditions, sched-
uled preventive maintenance should be performed every 2000 hours of operation.
Cleaning or Changing the Fan Filter
In order to provide adequate flow of clean air it is essential to regularly clean or
replace the rear-panel fan filter. Interval between filter cleaning or replacement is
dictated by the operating environment; the cleaner the source of cooling air the
longer the filter will remain clean.
The filter material is designed to be washed in a solution of mild detergent and
water.
To remove the filter, take out the two screws holding its housing. The inner part
of the housing has four dimples, that mate with slots in the outer portion, to hold
the filter securely in place. Separate the two halves of the housing by applying a
small amount of pressure to one side of the inner housing and pulling the
dimples free of the slots. When reassembling the filter housing be sure that the
dimples align with the slots before attempting to remount over the fan.
Performance Checks and Readjustments
Instrument performance should be checked after each 2000 hours of operation, or
every 12 months if used intermittently. This will help ensure maximum
performance and assist in locating defects that may not be apparent during
regular operation. The Performance Verification and the Adjustment Procedure
are in Sections 4 and 5.
Cleaning
CAUTION. A 2% RMA flux content solder is recommended for making repairs in
this instrument. Cleaning of rosin residue is not recommended. Most cleaning
solvents tend to reactivate the rosin and spread it under components where it
may cause corrosion under humid conditions. The rosin residue, if left alone,
does not exhibit these corrosive properties.