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Issue 4 October 2002
51555-233-116
To change the operating mode of the 7400A from DCE to DTE (or vice versa), you
change the position of a small circuit board (the Electronic Industries Association
connector board) inside the case. See Figure 11 and proceed as follows.
!
WARNING:
Electrostatic discharge can severely damage sensitive electronic circuits.
Before handling any electronic hardware, be sure to wear a grounding wrist
strap or other static-dissipating device. Do not touch exposed circuitry or
semiconductor chips.
1. Unplug the data module from the power receptacle.
2. Remove the access panel on the top of the case by grasping the rear lip of
the panel and pulling sharply upward.
3. While facing the front of the data module, locate the small EIA connector
circuit board. It sticks up vertically, and a large, silver arrow on the main
circuit board points to it.
Figure 11. Data module mode selector
4. Note the three letters engraved in the upper lefthand corner of the EIA
connector board. Data modules ship from the factory with board inserted
with “DCE” in the upper left corner.
1. 7400A data module 2. EIA connector board (shown in DTE mode)
POWERTEST
NEXT/NO BACK ENTER/YES
7400A Data Module
DATA
HOME
DTE
7400atop KLC 053096