![]() #CHANNEL MASTER 7777 TV ANTENNA PREAMPLIFIER BOOSTER TV#NOTE: You will not measure any DC voltage at the TO TV port of the power inserter.If you do not measure any DC voltage at the end of that cable, then the cable is bad or interrupted.You should measure the same DC voltage that you measured in step 2 above.Disconnect the coax cable from the preamplifier OUTPUT/POWER port and measure the voltage at the end of the long coax cable.Now, back up to the location of the antenna and preamplifier.Reconnect the long coax cable, that runs from your house to the location of the antenna and preamp, connect that long cable to the TO AMP port of the power inserter.You should measure the same voltage at the end of the short cable as you measured on step #2 b & c above.Connect a short coax cable to the TO AMP port on the power inserter and measure the voltage at the other end of the short coax cable.Reconnect the cable from the power supply adaptor, to the DC IN port on the power inserter.If you do not measure DC voltage, then either the cable or the power supply adaptor is bad(If ok, continue).Connect a short coax cable to the wall power adaptor and measure the voltage at the end of that cable.The voltage spec is on the label of the power supply adaptor.The voltage should read approximately 21VDC if you have the 15VDC version supply.There is a small green power indicator on this power supply. The voltage should be approximately 13.5VDC if your power supply is the 12VDC version adaptor.When measuring voltage, touch your red/+ probe to the center conductor and touch your black/- probe to the metal body/ground of the coax connector. ![]() If all connections are correct and tightened, and you get no channels you can use a volt meter to verify the voltage, then check the following.The power supply adapter that plugs into the wall power outlet will have a coax cable connected to it, that cable is in turn connected to the DC IN port on the power inserter.The TO TV port on the power inserter will be connected with a coax cable to the TV, splitter, or distribution amp.The other end of the long coaxial cable from the preamplifier OUTPUT/POWER port, connects to the TO AMP port on the power inserter.The OUTPUT/POWER port on the CM-7777v3/CM-7778v3 preamplifier should be connected to the long coaxial cable that goes into the house.The longer your cable, the more signal loss you will experience. To the INPUT port on the CM-7777v3/CM-7778v3 preamplifier. Connect a short coax cable from the antenna output, or the matching transformer that is connected to the 2 connection posts on the antenna.Use the included rubber boots to cover the connectors on the preamp for additional weather proofing. Over-tightening will damage the printed circuit board and render the preamp useless. Note: Torque spec is 35 in-lbs NOT 35 ft-lbs. Verify all coax connections are correct as described below, and tightened.The symptoms are virtually the same as weak signals. The CM-7777v3 is so strong that it can overdrive the input to your TV tuner. If you are testing a CM-7777v3, then you may not get all of the same channels that you can get without any preamp connected.If you are testing a CM-7778v3, you should get most all of the same channels that you can get without any preamp connected.You'll know that you need to troubleshoot your antenna system to find the issue. This could save you much time and you will not have to wonder if the problem is with the preamp system, or, with your antenna system installation. You might consider making this initial quick test first, to confirm that the preamp, power supply and power inserter are ok. The detailed troubleshooting instructions below are very comprehensive so as to try to eliminate any questions, in each step. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |