8-1
C H A P T E R 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 3772/3771 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.
W A R N I N G
Procedures described below may require removal of the instrument
cover. The instrument must be unplugged prior to service to prevent
possible electrical shock hazard.
W A R N I N G
Unplug the instrument prior to removing the cover to avoid potential of
exposure to laser radiation.
C a u t i o n
Whenever performing service on internal components avoid damage to
the EECPC 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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