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5
Service Information
WARNING
The information
in this section is in-
tended only for qualified
service per-
sonnel. Some
of
the procedures
may
expose you
to hazardous
voltages
that could result in personal injury
or
death. Do not attempt
to perform
these
procedures
unless
you
are
qualified
to do so.
5.1
Introduction
This section contains information
necessary to service
the Model 7011 multiplexer card and is arranged as fol-
lows:
5.2
5.3
5.4
5.5
Handling
and cleaning
precautions:
Discusses
handling
precautions
and
methods to clean the
card should it become contaminated.
Perfomance
verification: Covers the procedures
necessary to determine if the card meets stated
Cpdl~tiOIlS.
Special
handling
of static-sensitive
devices:
Reviews
precautions necessary when handling
static-sensitive devices.
Principles
of operation:
Briefly discusses circuit
operation.
5.6
Troubleshooting:
Presents some troubleshooting
tips for the Model 7011 induding relay replace-
ment precautions.
5.2
Handling and cleaning precautions
Because of the high-impedance areas on the Model
7011, care should be taken when handling or servicing
the card to prevent possible contamination. The fol-
lowing precautions should be taken when servicing
the card.
Handle the card only by the edges and shields. Do not
touch any board surfaces or components not associated
with the repair. Do not touch areas adjacent to electrical
contacts. When servicing the card, wear clean cotton
gloves.
Do not store or operate the card in an environment
where dust could settle on the circuit board. Use dry ni-
trogen gas to clean dust off the board if necessary.
Should it become necessary to use solder on the circuit
board, use an OA-based (organic activated) flux. Re-
move the flux from the work areas when the repair has
been completed. Use pure water along with clean cot-
ton swabs or a clean soft brush to remove the flux. Take
care not to spread the flux to other areas of the circuit
5-l
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Table of Contents
Troubleshooting
