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07506C DCN6727 77
CHAPTER 9
Maintenance, Service,
and Troubleshooting
This chapter describes recommended maintenance procedures and
is intended to be used by a service technician with skills in both
electronics and mechanics. Static preventative measures should be
observed when handling any printed circuit board connectors.
Regular maintenance of the Model 651 instrument will help ensure
years of useful operation; however, the frequency of service depends
upon the frequency of use and the cleanliness of the air measured.
TAPI recommends annual maintenance and calibration for the
Model 651.
If you need to contact TAPI for assistance, please have the Model
651 close to the telephone when discussing the problem with a
TAPI technician.
WARNING
Procedures described on the following pages may require removal of the
instrument cover. The instrument must be unplugged prior to service to
prevent possible electrical shock hazard.
WARNING
Unplug the instrument prior to removing the cover to avoid potential of
exposure to laser radiation.
Caution
Whenever performing service on internal components avoid damage to
the Model 651 circuitry by not stressing internal wiring, through bumping,
snagging or pulling. Also use electrostatic discharge (ESD) precautions:
Use only a table top with a grounded conducting surface.
Wear a grounded, static-discharging wrist strap