Cobra 200 gt l no tx

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tony2803
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Call Sign: 163TM2803
Location: Cwmbran, South Wales.

Cobra 200 gt l no tx

Post by tony2803 » 09 Nov 2017, 16:52

Pick up a nice cobra 200 gtl with no tx. Everything else works fine. I can hear myself on talk back but no tx on normal transmit. Any ideas where to start.

speeddemon

Re: Cobra 200 gt l no tx

Post by speeddemon » 09 Nov 2017, 20:22

Hi tony2803 first id would check the rd16hhf1 driver its known to go bad and all caps n resistors/zeners /etc in predriver/driver/final stages and get yourself a service manual off the interwebbs .gd luck . Cheers n 73's

tony2803
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Joined: 13 Mar 2015, 19:28
Call Sign: 163TM2803
Location: Cwmbran, South Wales.

Re: Cobra 200 gt l no tx

Post by tony2803 » 09 Nov 2017, 23:41

Thanks for your reply
Looking at the circuit diagram I cannot find it. What would be the mosfet mark on the diagram . Thanks.

speeddemon

Re: Cobra 200 gt l no tx

Post by speeddemon » 10 Nov 2017, 00:25

Hi tony2803. ya as far as I remember its trans mq73 left of L21 been awhile since I've had one on the work bench.. any needed info on it can be found on cbtricks .com and a quick google search cobra 200gtl dx problems might help you out .to get da known manufacturer bugz out of the radio . Gd luck cheers n 73's

sonoma
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Re: Cobra 200 gt l no tx

Post by sonoma » 10 Nov 2017, 02:48

Tony here is all the info from cbtricks that will help you locate the driver and how to tune the radio.

http://www.cbtricks.com/radios/cobra/20 ... /index.htm

sonoma
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Re: Cobra 200 gt l no tx

Post by sonoma » 10 Nov 2017, 02:51

you can go into the tour of the radio and click on the 3rd piture down and on the left to see the driver. it has 16hhf I think it is marked on top of the part you are looking for. I did not look in the service manual but it may have a voltage chart to check the part. most do have that info.

here is a link also from Cobras web site that might help if you do not find what you need on cbtricks. look at the service bulletins also.

http://downloads.cobra.com/10meter/10meter.htm

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