User's Manual

X-2
Troubleshooting
The first and most important aspect of troubleshooting anything is to be systematic. Note where you
have looked and what you found.
Look first for the obvious.
• Make a physical inspection of the entire facility. Are all necessary connections properly made? Do
you see any signs of obvious damage within the equipment?
• Is the AC power ‘ON’ to the site and the equipment? (Check fuses and circuit breakers if
necessary.)
• Are all the switches in the correct operating position?
• Is the input signal present?
• Check LCD readings for presence of forward and reflected power and 30 V DC supply levels.
The above is an aid in determining the fault if some aspect of the system is not operating. The
following table deals with quality of operation:
Symptom Possible Fault Correction
Horizontal bars in picture (may
roll either way depending on
phase)
AC grounding / AC interference Install EMI/RFI filter in AC line
Ensure modulator/processor
and power amplifier share a
common ground
Diagonal lines in picture Interference Install EMI/RFI filter in AC line
Determine source and
frequency of interfering signal
(spectrum analyzer may be
required)