General Care, Troubleshooting and Service
6-3
C l e a n i n g a n d R e p l a c i n g C h a r g e r N e e d l e s
If you receive an error code (Tables 6-2 and 6-3) identifying a problem with
either the positive or negative charger current or voltage, you will need to
clean or replace the electrode in the charger head.
The procedures for the negative and positive charger needles are very
similar. To clean or replace the positive charger needle, follow the
procedure for cleaning or replacing the negative charge needle, but read the
short section below on the differences between the two procedures.
Note:
Protect your back. Because of the height of the EEPS spectrometer,
these procedures are easier when the instrument is on the floor.
Because of the instrument’s weight, always have two people move
the instrument.
Cleaning the Negative Charger Needle
W A R N I N G
High voltage is accessible in several locations within this instrument.
Make sure you unplug the power source to the instrument before
performing maintenance procedures.
To clean the negative charger needle, proceed as follows:
1. Power off the equipment and wait 5 minutes for the internal capacitors
to discharge.
2. Remove the top cover by:
a. Loosen the three top-panel screws on each side of the instrument.
(
Note:
Screws do
not
need to be removed. Panels are slotted to
allow for removal without removing the screws.
)
b. Loosening the two top-panel screws on the back of the instrument.
c. Lift the back of the top panel up slightly, then pull it backward and lift
it out (Figure 6-1).
