Ref: 99980146
Title: Changing 3Server PROMs for EtherSeries Enhanced
Date: 1/1/87

Copyright 3Com Corporation, 1991.  All rights reserved.

This procedure describes how to replace the PROMs on a 3Server's
CME board. This must be done to allow EtherSeries Enhanced
software to be installed and to start the 3Server from a
Macintosh computer over an AppleTalk network.

Procedure

1.  Power off the 3Server

Caution: The 3Server is susceptible to static discharge when the
internal components are exposed. Before removing the 3Server's
front panel or touching its internal components, ground yourself
properly (using grounding straps and anti-static mats) to
discharge static electricity.

2.  Remove the 3Server's front panel and top cover as explained
in the 3Server Guide.

3.  The PROMs are located at CME board locations Cll and C12 (an
unused socket is at location CI0). The high PROM, A.15-1, should
be labeled with 3Com part number 0729-58; the low PROM, A. 15-0,
should be labeled with part number 0729-08. These are the part
numbers for the current PROMS; PROMs labeled with other numbers
are earlier versions.  PROM version does not matter; the PROMs
must be replaced with the new PROMs in the upgrade kit.

4.  Gently remove the PROMs using a PROM puller or large IC scope
probe tip.  If necessary, disconnect the ribbon cable next to the
PROMs to allow more work space.

CAUTION:  Do not use a screwdriver to remove the PROMs; if it
slips, the screwdriver could damage the ribbon cable connector or
surrounding components.

5.  While still properly grounded, remove the new PROMs from
their package.  THe high PROM, D.9-1, should be labeled with 3Com
part number 2298-04; the low PROM, D.9-0, should be labeled with
part number 2298-03.

6.  First install the high (or HI) PROM.  Notice the notch at the
top of the PROM.  Position the PROM over the socket at board
location C11 so its notch is on the side away from the ribbon
cable connector.  The board socket also has a notch, which should
line up with the PROM's notch.  See Figure 2 below.  Line up the
PROM's pins over the socket holes, one side at a time, and press
down gently until the PROM is seated correctly.  Then press down
firmly to make a solid contact.

If the PROM's pins do not fit easily into the socket, do not
force them.  The pins on new IC chips are sometimes spaced
further out than the socket holes.  If necessary, gently bend the
pins until they fit properly in the socket.

7.  Follow the instructions in Step 6 to install the low (or LO)
PROM into the socket at board loction C12.

8.  Reconnect any cables disconnected during the procedure.

9.  Replaced the 3Server's top cover, making sure the cables are
laying as flatly as possible at the back of the server.  Leave
the four top cover screws off for now.

10. Turn on the 3Server and allow it to run its startup
diagnostic tests.

If the server does not start, the cause could be:

    * Improperly installed PROMs.

    * Defective PROMs (possibly caused by static electricity).

    * Loose or improperly connected cables inside the 3Server

In this case, turn the 3Server's power off, remove the top cover,
and check the PROM and cable connections.  If the 3Server's
diagnostic tests run but the startup does not complete
successfully, turn off the power and:

    *  Check all the peripheral cables for proper connection.

    *  Make sure the 3Server's thumbwheel switch is in position
       0 and its OPERATE/TEST switch is in the OPERATE position.

If the problem still exists, contact your service technician.

11. When the 3Server boots successfully, power it off again and
then replace the four top cover screws and the front panel. Then
restart the server.

12. Discard the old PROMS.
