6. Access and Maintenance
The only access to the inside of an xDAP unit is through removable front connector panels. Sometimes these panels are
solely for purposes of physically mounting signal connectors, but sometimes a mounted circuit board behind the panel will
fit into board guides, and physically and electrically connect deep inside the unit. The only reason for opening these panels
is for purposes of mounting or maintaining connectors or connector/circuit board modules. Make sure that the unit is turned
off and power switched off before uncovering any panels. Disconnect the power and signal cables before inserting or
removing boards. Slots should not be left uncovered. Do not allow chemical, liquid, or foreign object to get into the unit
while slots are uncovered. Use electrostatic charge precautions when handling boards, which may carry delicate static-
sensitive components. Make sure that modules are correctly seated and the panels tightly reattached before operating the
equipment again.
Except for the modules that fit the covered slots, and the external cables and connectors that attached to external connectors,
the system has no user-repairable parts. In the event that the high-speed fuses act and possibly limit accidental electrical
overload damage, these too are mounted on internal circuit boards and are not user-replaceable. The unit must be shipped
back to the factory for repair. Contact Microstar Laboratories at the address listed in the front of this manual.
Over long periods of time, it is possible that the xDAP unit will start to exhibit small offset and gain errors in its
measurement results. Follow your organization's policies and use good technical judgment about how often to check the
calibration of your equipment. Calibration adjustments do not require access to the interior of the unit. Calibration of an
xDAP requires some very sophisticated equipment and is not “field adjustable.” Contact Microstar Laboratories, or have
your qualified calibration laboratory do this, for assistance.
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