C H A P T E R 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.
W A R N I N G
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.
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 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,
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