9
TM
StarBand Troubleshooting Quick Guide
Task: Defective LNB
Symptom: LNB is malfunctioning, reduced or no receive signal.
Diagnosis #1: Possible defective LNB - Test with Channel Master Dual Meter or
equivalent.
Resolution #1: First rule out other component failures, such as the IFL or modem, by
verifying the voltage at the LNB end of the IFL is between 13 and 18V DC. If available,
replace the suspect LNB with a spare and check signal strength with a signal-measuring
device. If a spare is not available and the supply voltage is ok, then the LNB most likely
has failed and must be replaced. For additional information on troubleshooting the LNB
see FSB SB-0016-1.00.
Task: Low Signal Quality
Symptom: Signal quality reading too low.
Diagnosis #1: Antenna not peaked
Resolution #1: Re-peak antenna
Diagnosis #2: Line of site problem
Resolution #2: Check for possible LOS obstruction and relocate the antenna. Call the
StarBand technical support if a satellite change is needed.
Diagnosis #3: Receive IFL cable may be defective or length may be too long.
Resolution #3: Measure resistance in cable using method in FSB SB-0020-1.00, with
cable disconnected at both ends, and Multimeter on OHMs scale, meter should read
Open, or Infinity. With one end of cable shorted, the other end should read a nominal
resistance value. Make sure IFL cable does not exceed 140’ for RG-6, or 215’ for RG-
11.For longer lengths, refer to FSB SB-0015-1.01 for line amplifier usage.
Diagnosis #4: Defective IFL connectors.
Resolution #4: Check outdoor connectors for corrosion, replace if needed.
Diagnosis #5: Moister in the feed horn.
Resolution #5: Check for cracks in plastic and replace if needed.
Diagnosis #6: Transmit signal being filtered twice.
Resolution #6: Remove the Transmit Reject filter if allowable. See FSB SB-0016-1.00
Diagnosis #7: Defective LNB
Resolution #7: Replace LNB
Note: If the LNB is determined to be defective, replace the LNB with a spare (if available)
to confirm that the unit is defective. Upon confirmation, contact StarBand for replacement.
