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CHAPTER 4
MAINTENANCE
4.1
GENERAL.
This chapter contains information necessary to perform preventive
and corrective maintenance on the Model 75D. When corrective maintenance is
indicated, the work should be'done by technically-qualified people, and should follow
normal practices and techniques.
Before performing corrective maintenance, review the
theory of operation in Chapter 5.
An understanding of the Model 75D operating principles
will make corrective maintenance much easier.
4.2
PREVENTIVE MAINTENANCE. With proper care, the Model 75D normally will
require only periodic performance tests (Part 1) and occasional alignment or calibration
(Part III).
Abusive or careless handling of the Model 75D can cause malfunctions or
failures.
A dropped or severely jarred equipment is almost certain to require alignment
or calibration, and more serious malfunctions or part failures may result.
The only
preventive maintenance recommended for the Model 75D is the exercise of reasonable
and professional care plus an occasional wipedown of the external surfaces when required.
CAUTION:
Do not attempt to lubricate any internal gears or moving
parts because dust will accumulate and clogging may result.
4.3
CORRECTIVE MAINTENANCE,
The corrective maintenance instructions and
data required to service the Model 75D are provided in the following sections of this
chapter.
Part I contains test procedures for checking the performance of the Model 75D.
When servicing is required, refer to Part II for troubleshooting information.
If alignment
or calibration is required, the troubleshooting chart will refer to
the applicable procedure
in Part III. While servicing the Model 75D,
follow the applicable disassembly and
reassembly procedures in Part IV to gain access to an internal assembly and to reassemble
the equipment after servicing is completed.
PART 1.
EQUIPMENT PERFORMANCE TESTS
4.4
USING THE EQUIPMENT PERFORMANCE CHECKLIST.
Use the equipment
performance checklist in Table 5 to test the functional operation of the Model 75D.
When using the checklist, perform every step of the procedure in the numerical
sequence indicated.
A properly functioning equipment should meet all performance
standards.
If the performance of the Model 75D is substandard, proceed to Part II in
this chapter for troubleshooting instructions.
If desired,
the Model 75D may be
returned to the factory for repairs; however, first call on either the manufacturer or
your nearest sales engineering representative for consultation.
Typical applications of
the equipment performance checklist are as follows:
a. As an incoming-inspection procedure.
b. Whenever substandard performance is suspected.
c. To final test the Model 75D when corrective maintenance is completed.
75 D
b-370
44
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