50
PN: 81127
Rev 4, 6/2017
5.3
Service and Repair Instructions
Basic troubleshooting information has been provided to guide the technician to the possible
source of a problem.
Since the STVI uses Surface Mount Technology, repairs of the individual printed circuit boards
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.
5.3.1
Basic Troubleshooting
The troubleshooting information relies on the technician to have a good understanding of the
operation of the unit. The technician should contact the factory should they have any questions
regarding the operation of the unit. Provide the Megger the serial number of the STVI when
making inquiries.
WARNING
It is necessary to energize the SPI to properly troubleshoot the STVI.
The technician must take all applicable safety precautions for working with the possible
energized outputs of the SPI.
NOTES
Before suspecting a failure in the STVI review the Description of Controls and Theory of
Operation sections to ensure that the problem is not a result of operating error.
Common causes of malfunctions, other than improper operation, are bad Ethernet cable or cable
connectors, or incorrect power input (voltage above or below specified limits).
NOTE:
Under no circumstance should the technician take the STVI apart without
following proper ESD protection and handling procedures. Failure to do so, will
damage sensitive parts.
5.3.1.1 Power Input
Input voltage affects the whole unit, including the 48 Volts DC to the STVI from the PoE port, and
may or may not cause permanent damage if voltage is incorrect. These problems can often be
corrected by simply using a better source of input power. See unit front panel for input voltage
rating.
Some symptoms are as follows:
1.
Low voltage:
Erratic operation, no display, or a dim display.
2.
High voltage:
Circuit breaker operation on SPI unit, power supply failure.
a. For SPI1 and MPRT 8430 units, the STVI uses the PoE power supply. It has an LED that
lights up under normal operation. If not lit, then the PoE power supply has failed and
needs to be replaced, PN: 90001-736.
