23
MINIATURE LOCAL MUX-12
WARNING
These service instructions are for use by qualified
personnel only. To avoid shock, do not perform any
servicing other than that contained in the operating
instructions unless you are qualified to do so.
Table 5-1. Fault isolation and troubleshooting.
Symptom
Action
All front-panel
a) Check that power is supplied to the unit.
indicators are off
b) Replace unit. The fault is probably in the unit’s power-
supply circuits.
Local SYNC LOSS and/or a) Check the main channel’s connection at both sites. Verify
REMOTE SYNC LOSS
that these connections are in accordance with the procedure
is ON
described in
Section 3.4.7
and
3.5.3
.
b) Replace both units: one at a time. If the problem still exists,
the main channel link between the units is probably defective
and should be checked.