User Manual Chapter 7

Chapter 7: Testing and Troubleshooting 7-21
Step 2. Do some CBSs communicate and some not?
Problem Causes Possible Remedies
Defective cable or
incorrectly wired
connector caused a break
in communication
somewhere in CBS chain.
Check cables.
Two CBSs are configured
with the same address.
Check CBS address settings.
Primary CBS
communications are
OK, but other CBSs
do not communicate
at all.
CBS is defective. Replace CBS.
Power or communication
cable run is too long.
Check cable length guidelines.
Shorten cable run if necessary.
CBS is defective. Replace CBS.
CBS communication
is unreliable.
Communication cabling is
damaged or defective.
Check communication cabling.
CBS shows RF Off
and RF Power low
diagnostics while
other CBSs operate
correctly.
Excessive power cable
length.
Decrease power cable length.
Step 3. Are the CBS diagnostics OK?
Problem Causes Possible Remedies
Primary CBS sends a
timing signal that is used
by all secondary CBSs.
Bad communication
cable.
Check communication cabling.
All secondary CBSs
report "sync lost"
diagnostic.
Bad primary CBS. Replace primary CBS.
Bad communication
cable.
Check communication cabling.Single CBS reports
CBS sync lost.
Bad CBS. Replace CBS.