RELEASED: 10/2/2006
Page 48
COMMUNICATI0NS
HSD SERIES OPERATION AND MAINTENANCE
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HSD-2500 TROUBLESHOOTING CHART
PROBLEM
INDICATORS
CAUSE
SOLUTION
No Video going into the
modulator
Check Video and
Audio inputs to
modulator.
Up-Converter power
supply failure.
Check output of the
power supply using
the meter. Replace
P/S if defective.
IF/Up-Converter Failure
Check IF and Up-
Converter modules
outputs for correct
level and frequency.
Replace if defective.
NO OUTPUT
POWER
+12 VOLT SUPPLY CIRCUIT
HAS OUTPUT BUT NO FINAL
RF DRIVE. IF LOCK and/or LO
LOCK INDICATORS ARE
OFF.ON/OFF INDICATOR IS
ON.
Reference Oscillator
Failure
Check for correct
level and frequency.
Replace if faulty.
+12 VOLT SUPPLY CIRCUIT
HAS OUTPUT BUT NO FINAL
RF DRIVE. IF LOCK and/or
OUTPUT LOCK INDICATORS
ARE ON. ON/OFF
INDICATOR IS ON.
MODULATOR IS ON. TEMP.
FAULT INDICATOR IS ON.
Final Amplifier
Assembly is
overheated.
Check cooling fans to
make sure they are
operational. Make
sure the ambient
temperature is within
the specified range.
If the problem
persists, replace the
Final Amplifier.
+12 VOLT SUPPLY CIRCUIT
HAS OUTPUT BUT NO FINAL
RF DRIVE. IF LOCK AND/OR
OUTPUT LOCK INDICATORS
ARE ON. ON/OFF
INDICATOR IS ON.
MODULATOR IS ON. VSWR
OVLD. INDICATOR IS ON.
VSWR Overload
condition
Check Combiner, TX
Line and Antenna for
VSWR. Repair or
replace faulty
component before
placing transmitter
back on the air.
OUTPUT POWER LOW, ALL
OTHER INDICATIONS OK.
Failed Driver Amplifier,
Failed Final Amplifier
Replace malfunc-
tioning module.
LOW OR
DISTORTED
OUTPUT
SIGNAL
NO FAULT IS INDICATED
Output Power
Calibration is incorrect
See Section 5.6.