Tektronix 2642A Reference page 41

Installing the 2642A
Installation
You may place the analyzer on top of the host computer, but
any suitable surface that allows about two inches clearance for
the fan exhaust on the side is adequate. Do not place papers or
other obstructions over the air flow openings.
3.
Select the appropriate serial communications cable. We
supply one cable with a 9-pin host connector, for use with the
IBM AT, PS/2, or equivalent; and one with a 25-pin host
connector, for the IBM PC, XT, or equivalent.
4.
Connect the serial communications cable to the serial port
connector on the host PC (COM I or COM2) and to the
primary serial port connector on the rear panel (we
recommend COMI).
5.
Check the AC voltage selection on the rear panel.
If you have 95 lo 126 volt AC power, make sure that the
power entry module is set with the plastic tab pointing to
120V. The other three selections ( 100, 220, and 240) will not
work and will damage the analyzer.
If you have 180 to 250 volt AC power, make sure that the
power entry module is set to 240V. The other selections
(I
00
and 120) will not work and will damage the analyzer.
If the selection is incorrect, continue with steps 6 through 14,
below. If the selection is correct, skip to step 15.
6. IMPORTANT:
turn
off the power and unplug the power
cord.
7.
Use a small screwdriver to pry out the fuse holder from the
power module. See Figure 2-1.
8.
Remove the voltage selector card from the power module and
rotate the voltage indicator pin 180 degrees. Figure 2-2
illustrates changing the card from 120v to 240v.
9.
Replace the voltage selector card, with the small pointer
toward the fuse.
2-3