5.
You will see instructions on how to download and update the firmware in their
MPRT unit. Then click on
MPRT Firmware Update
. The firmware will be
downloaded onto the users PC ready to update their unit(s).
The fourth way to update the firmware would be to return the unit to Dallas. Any customer
with Version 27.4 is required to return their unit to Dallas for upgrades. Those with V28 or
higher can update via the three other methods.
6.3
Service and Repair Instructions
It is not always necessary to return the complete MPRT unit to the factory for repair. To
save turn-around time and reduce costs, MPRT was designed as a modular unit. In most
cases, if any one module should experience a problem it should not cause the test
system to be down. Basic troubleshooting information has been provided to guide the
technician to the possible source of a problem.
Most of the problems experienced with the MPRT can be corrected with a replacement
module. Since MPRT uses Surface Mount Technology, most repairs of the individual
modules are beyond the scope of the basic troubleshooting guide, and should be referred
to the Service Department at Megger or handled through the Megger Representative.
If the unit is still within the original warranty period, or limited warranty period
following factory servicing,
the factory must be contacted before attempting any
repairs or the warranty will be void.
6.3.1 Basic Troubleshooting
The troubleshooting information relies on the technician to have a through understanding
of the operation of the unit. If the technician is unfamiliar with the unit, he or she should
not attempt to repair. The technician should contact the factory before attempting repairs.
Provide the Megger part number for the part or assembly in question and the serial
number of the MPRT when making inquiries.
WARNING
It is necessary to energize the MPRT to properly troubleshoot
some of the modules. The technician must take all applicable safety precautions
for working on energized circuits.
NOTES
Before suspecting a failure in the MPRT, review the Description of Controls and Theory
of Operation sections to ensure that the problem is not a result of operating error.
Preliminary testing of the MPRT within its specified limits can help determine if a
malfunction actually exists, identify the type of malfunction and define the general area of
the failure.
Common causes of malfunctions, other than improper operation, are incorrect power
input (voltage above or below specified limits), incorrect test signal voltages applied to
the Binary Input Timer Monitor/Start/Stop gates (outside of the specified AC/DC
Applied/Removed limits), and contact or circuit resistance too great for the Dry Contact
gates to operate properly on the Monitor/Start/Stop gates. Typical malfunctions for the VI-
Gen amplifiers are external short circuits on the voltage output and open circuits on the
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