8-1
CHAPTER 8
Maintenance and
Service
This chapter is written for 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 3775 Condensation Particle
Counter (CPC) will help ensure years of useful operation. The
frequency of service depends on the frequency of use and the
cleanliness of the air measured. This section describes how to
check and service some components of the CPC.
You are encouraged to call TSI for assistance in performing special
maintenance. It may also be helpful to have the technician, tools,
and the CPC close to the telephone when discussing the problem
with a TSI technician. Refer to this chapter for directions on
contacting a technical resource at TSI.
WARNING
Procedures described below 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 CPC
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
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