Sierra Video Tahoe Series 16 - Manual (Page 48)

Sierra Video Systems
42
Switching Malfunctions
Problem Remedy
The switcher
succeeds in
switching a
number of
sources then fails
to switch one. Malfunction in the particular source or cable assembly.
NOTE:
The most common failure mode in transferring the signal of an audio source is a
break in the connecting wire.

Disconnect the source from a channel that is switching successfully and
connect the suspect source to it. If the channel continues to switch
successfully, then there is something wrong with the Matrix Switcher or the
suspect source was not connected properly. If it does not continue to switch
successfully, then there is something wrong with the source or cable
assembly.
The Matrix
Switcher turns ON
but will not switch
at all  Check the LEDs on the serial processor board. If they are not counting, the
control module is dead. If the control panel is not lit, check the ribbon cable
connection between the panel and the processor control module.