Rockwell Automation 2711E-xxxx PanelView Operator Terminals User Manual - Manual (Page 133)

7–2 Maintaining PanelView Terminals
Publication 2711E-821 – January 1998
Changing the Fan Filter (1200e and 1400e)
Clean the fan filter whenever it appears to be clogging up. Remove
the filter cover from the back of the terminal by popping it free of its
plastic side clips and clean it by:
•
removing the dust with a vacuum cleaner
•
washing with warm water and soap. Be sure the filter is dry
before you replace it
•
the filter is made of flame-retardant urethane foam 0.13 inches
(3.3 mm) thick, and measures 3.64 inches by 3.54 inches (92.5 by
89.9 mm). Replace unusable filters with part number 09362-M/45
from Hitachi or Qualtek Electronics.
Degaussing the CRT (1200e and 1400e)
If an external magnetic field (such as an electric motor starting up)
occurs near a color terminal, the CRT may retain some residual
magnetic effect, which could affect the clarity of the display.
Degaussing removes any such residual magnetism by totally
demagnetizing the CRT. Automatic degauss occurs each time ac
power is re-applied to the terminal.
For the 1200e terminals, degauss occurs also at midnight (according
to the terminal’s system clock) daily. You can also degauss the 1200e
color terminal manually in Configure mode. See Chapter 4 of this
manual for more information.
If the terminal is powered by an isolated power source, be sure the
line transformer can handle the surge that occurs while the terminal
degausses. See Appendix B and C for degauss specifications.
Avoiding Strong Magnetic Fields (1200e and 1400e)
Because the terminal display contains a CRT, the presence of strong
magnetic fields near the terminal will distort the image on the screen.
Magnetic fields stronger than 80 milligauss at the front surface of the
terminal should be avoided.