Maintenance A-7
9. Remove the tubing from each end by pushing the tubing from its end
off of the filter rather than pulling the tubing off.
10. If any of the tubing becomes damaged, replace it with an equivalent
length of the same tubing.
11. Snap the filter back into its holding clip.
12. Replace each filter in turn until all four have been replaced.
13. Tilt the digital printed circuit board back down until the ribbon cable
connector can be plugged back into the board. Plug in the ribbon
cable connector.
14. Tilt the digital printed circuit board down fully and fasten with the
screws provided.
15. Replace the cover on the instrument.
16. Tighten the six screws holding the cover in place.
17. Replace the outer inlet retaining ring and tighten firmly.
18. Insert the power cord into the power entry connector on the back of
the instrument.
19. Apply power to the instrument with the switch on the rear panel.
20. Check that the flows are correct.
Replac i n g t he EPR O M
Normally the EPROM will not be replaced, however, early shipments of the
Model 3321 APS™ spectrometer may not have all functions/features in
place and therefore EPROM replacement will be necessary in the field.
To replace the EPROM, proceed as follows:
W A R N I N G
Make sure power is switched off and power cord is disconnected to
avoid any exposure to hazardous laser radiation.
W A R N I N G
High voltage is accessible in several locations within this instrument.
Make sure you unplug the power source before removing the cover or
performing maintenance procedures.
C a u t i o n
The electronic circuits within this instrument are susceptible to electro-
static discharge (ESD) damage. Use ESD precautions to avoid
damage.
Use only a table top with a grounded conducting surface
Wear a grounded, static-discharging wrist strap
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