Table of Contents
Advertisement
WARNING
The information in this section is
intended only for qualified service
personnel. Some of the procedures
may expose you to hazardous volt-
ages 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 7013 relay card and is arranged as follows:
5.2
Handling and cleaning precautions
cusses handling procedures and cleaning meth-
ods for the switch card.
5.3
Performance verification
dures necessary to determine if the card is
operating properly.
5.4
Special handling of static-sensitive devices
Reviews precautions necessary when handling
static-sensitive devices.
Principles of operation Briefly discusses cir-
5.5
cuit operation.
Troubleshooting Presents some troubleshoot-
5.6
ing tips for the switch card.
Service Information
Dis-
Covers the proce-
5.2
Handling and cleaning precautions
Because of the high impedance circuits on the Model
7013, care should be taken when handling or servicing
the card to prevent possible contamination, which
could degrade performance. The following precau-
tions should be taken when handling the switch 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 and shields. Do
not touch any board surfaces, components, or connec-
tors. 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 to
remove the flux. Take care not to spread the flux to
other areas of the circuit board. Once the flux has been
removed, swab only the repaired area with methanol,
then blow dry the board with dry nitrogen gas.
After cleaning, the card should be placed in a 50°C low
humidity environment for several hours.
5
5-1
Advertisement
Table of Contents
