Maintenance 5–17
High Voltage
Module
High Voltage
PCB
High Voltage
Power Supply
Figure 5-6
Determination of High-Voltage Polarity
The standard Electrospray is equipped with a positive high-voltage
module, which causes the generated droplets to initially have a
high-positive charge. However, if initially negatively charged
droplets are desired, a negative high-voltage module is available
from TSI. Reversing the high-voltage polarity is a procedure that
should only be performed by a qualified electronics technician
observing ESD precautions. To replace one high-voltage module
with another, refer to Figure 5-7 and proceed as follows:
1.
Remove power from the instrument and turn off all flows.
2.
Remove the cover by loosening the four screws securing the
cover (they do not have to be removed) and pulling the cover
upward while pushing down on the top of the front panel of the
instrument or on the viewing window mount.
