Installation
025-9368H
25
Installing New EPROMs
Most changes to the Model 748 are made only to the controlling software. Whenever a change is
made to the Repeater Interconnect, new EPROMs containing the operating software for the unit
must be installed. ICs are delicate and sensitive to static. When handling them, be sure to remain
grounded by maintaining contact with the chassis sheet metal. Only remove the ICs from the static
protective shipping material when ready for installation. The following steps outline the EPROM
installation procedure.
1.
TURN OFF THE POWER, or remove power connector at rear.
2.
Remove the top cover.
3.
Carefully note the orientation notch on the end of the old EPROMs.
4.
Remove the old EPROMs from the board.
5.
Install the new ICs in the designated sockets with the orientation notches aligned with the
notches in the sockets.
6.
Carefully examine all pins of each IC. Make sure pins are aligned in the sockets, fully inserted
and not bent out or under.
7.
Turn on power to the Model 748 and make sure that the front panel gives a normal display. If all
LEDs are on, there is a problem.
8.
Replace the top cover of the unit.
9.
Return the old EPROMs to Zetron in the protective shipping material in which the new EPROMs
were shipped.
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