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Cobra 89xlr
- Thread starter Ben Hebert
- Start date
You're going to need some test equipment such as a decent DVM, watt meter, and a 50 ohm dummy load - for starters. Then, you are going to learn how to troubleshoot. You will also need to understand how different kinds of components work and reading a schematic.
The most likely cause for no transmit begins at the mic. Is it wired properly? What happens when you key the mic; is the TX light changing? The next most likely culprits are the driver and final transistors failure. This is where troubleshooting comes in. You will need to learn how to test transistors and other components, and diodes. Then everything in between. It is no walk in the park . . .
The most likely cause for no transmit begins at the mic. Is it wired properly? What happens when you key the mic; is the TX light changing? The next most likely culprits are the driver and final transistors failure. This is where troubleshooting comes in. You will need to learn how to test transistors and other components, and diodes. Then everything in between. It is no walk in the park . . .
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you may not have D14 if the radio has already had this mod. take a look at the repair.
http://www.cbtricks.com/radios/cobra/89xlr/graphics/cobra_89xlr_tb1219.pdf
http://www.cbtricks.com/radios/cobra/89xlr/graphics/cobra_89xlr_tb1219.pdf
I just recieved the radio two weeks ago. So no it never transmitted at all. I found d14 but as far as to testing shows it's good.
Does your unit need the d14 upgrade? If so, I would probably also test tr14, and the driver and final just because it is easy.
Sonoma posted a link to a cobra bulletin that outlines a diode swap of d14. It lists the serial number that the factory made the change. Transistors are tested just like diodes. It is easy, and only a google away.