Cobra 75 Tx no Rx - Jeep Wrangler Forum

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Old 08-25-2013, 03:45 PM   #1
Join Date: Feb 2012
Location: Lancaster, CA
Posts: 1,658
DaK is on a distinguished road
Cobra 75 Tx no Rx

Started having this problem about a month ago. At first comms were just scratchy, couldn't hear well on the Rx but everyone stated they could hear me fine. Then, nothing on the Rx, not even static. Though the "head" unit could be bad so ordered up another one, same problem.

Ran through the steps on this website:

CB Radio Articles: Selection | Installation | Troubleshooting

All checks were good. That is to say, opens where opens should be, shorts where shorts should be. Connected system directly to the battery and achieved the same results, no Rx, no static, nuttin except the backlighting. So power is not the problem.

Antenna and mount check good with IAW the firestick website.

Testing Continuity -- 1996 Firestik&#174 Antenna Company

Have the left most set up.

Another thing we don't get is when the CB is turned on you normally get "tones". Nothing there. Would suspect another bad "head" unit but my thought is that two bad units should be near impossible to achieve.

Antenna is mounted on a Rockhard tire carrier which as previously stated, worked fine till about a month ago.

Any and all insight welcomed. Seriously thinking about cashing this for a Uniden....
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Old 08-25-2013, 04:39 PM   #2
Join Date: Feb 2012
Posts: 9
bigal66 is on a distinguished road
Sounds like the speaker is out? Had that happen once. Sat in the hot car too many months, speaker got progressively fuzzy, then nothing. If you have a remote speaker, check the wiring. You should also be able to plug in an earphone to the external speaker/PA jack. If you dont hear anything, probably the driver transistors went out. Good luck.
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