6
Service Information
6-1
WARNING
The information in this section is
intended 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 proce-
dures unless you are qualified to do so.
Introduction
This section contains information necessary to service the
Model 7022 matrix-digital I/O card and is arranged as
follows:
•
Handling and cleaning precautions
—
Discusses
handling procedures and cleaning methods for the card.
•
Performance verification —
Covers the procedures
necessary to determine if the card is operating properly.
•
Functionality test —
Provides a test procedure to de-
termine if a digital I/O input or output channel is func-
tioning properly.
•
Special handling of static-sensitive devices —
Re-
views precautions necessary when handling static-sen-
sitive devices.
•
Principles of operation —
Briefly discusses circuit
operation.
•
Troubleshooting —
Presents some troubleshooting tips
for the card.
Handling and cleaning precautions
Because of the high impedance circuits on the Model 7022,
care should be taken when handling or servicing the card to
prevent possible contamination, which could degrade perfor-
mance. The following precautions should be taken when
handling the card.
Do not store or operate the card in an environment where
dust could settle on the circuit board. Use dry nitrogen gas to
clean dust off the card if necessary.
Handle the card only by the side edges. Do not touch any
board surfaces, components, or connectors. Do not touch
areas adjacent to electrical contacts. When servicing the
card, wear clean cotton gloves.
If making solder repairs on the circuit board, use an OA-
based (organic activated) flux. Remove the flux from these
areas when the repair is complete. Use pure water along with
plenty of clean cotton swabs or a soft brush to remove the
flux. Take care not to spread the flux to other areas of the cir-
cuit board. Once the flux has been removed, swab only the
repaired area with methanol, then blowdry the board with
dry nitrogen gas.
After cleaning, the card should be placed in a 50°C low
humidity environment for several hours.
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Summary of Contents for 7022
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