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Support Strategy
Cable Repair
User Responsibility
System Console
The HP 27140A Multiplexer Interface card is a Field Replaceable Unit
(FRU). The electronic components and circuitry on the card are not
repairable except under factory conditions. Exchanging boards also sig-
nificantly reduces downtime compared to removing, repairing and replac-
ing the original card. Whenever the PCA is replaced, remove the
EPROM and retain it for insertion in the replacement card, as the new
card
will
not have an EPROM on it. Insure that precautions are taken to
protect the EPROM from static discharge.
Component level repair is not supported by Hewlett-Packard. Users who
attempt repair at this level may invalidate their warranties. The sole ex-
ception to this guideline is the EPROM. Your HP Customer Engineer
will
remove it, have it tested and replace it
if necessary.
The multiplexer is designed with an extremely compact cable connector.
Because of the tolerances for the cable connector it is impossible to repair
or modify the board connector end of the PCA -to-Panel cable. Any
failure of the cable at the board connector end requires replacement of
the cable assembly.
The junction panel end of the cable was fabricated using a conventional
connector. Tables in Chapter 6, "Reference", list the pin assignments for
this cable.
There are no physical adjustments to make on this card nor is any special
preventive maintenance required. You may want to clean the computer
card cage occasionally.
If so, your computer manual will have instructions
on this subject. In case of apparent card failure, run the self test described
in Chapter 4.
If the board fails, call your HP Customer Engineer.
If the system console is attached to port 0 of the RS-232-C Junction Panel,
the resident fIrmware on this card
will
transmit to and receive from the
console at 9600 baud, using 8 bit ASCII characters with no parity check
bit. There will be one stop bit.
General Information 1-7
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