Various brands OTDR service
Internal optics
Battery
Others
Re-new EXFO EUI-91 SC Connector Adapter Cap For All EXFO OTDR Models
Re-new OTDR launch box two connectors
JDSU OTDR false live signal detection problem
The possible fix:
to re-load the firmware twice
to downgrad to an earlier software then upgraded to the latest available version
for the current and earlier software releases, please visit: https://4k.updatemyunit.net/
the instructional video on how to perform this procedure via USB: https://www.youtube.com/watch?v=MkqXl8Sz35M
Viavi OTDR info required for service
the serial number
the serial number of the mainframe by look under the settings menu and system info, or unscrew and take off OTDR module and sticker is behind mainframe