Comtech EF Data QAM256 - Manual (Page 40)

QAM256 Digital Video Modulator and Upconverter Maintenance and Troubleshooting
TM077 – Rev. 4.0 6-1
Maintenance and Troubleshooting
6
6.0 Periodic Maintenance
The QAM256 modulator requires no periodic field maintenance procedures. Should a unit be
suspected of a defect in field operations after all interface signals are verified, the correct
procedure is to replace the unit with another known working QAM256. If this does not cure the
problem, wiring or power should be suspect.
There is no external fuse on the QAM256. The fuse is located on the
power supply assembly inside the case, and replacement is not
intended in the field.