I received a cobra 29 with burnt out finals. I put a mosfet kit in it. The IC4 audio chip gets very hot. I replaced the chip and it still gets hot. I checked the solder joints and they look good. I don't know if the IC4 is getting hot from what I did or from the previous damage. Any ideas on where to go next?? The IC4 chip has 12.6 volts across the the terminals. Is this to high?//
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cobra 29 wx nw st
- Thread starter randl
- Start date
You replaced the IC, did you put the thermo-grease on it before mounting it?
You need a copy of this:
http://www.cbtricks.com/radios/cobr..._st/graphics/29ltd-st_29wx-st_sm_pg1_pg11.pdf
http://www.cbtricks.com/radios/cobr...st/graphics/29ltd-st_29wx-st_sm_pg12_pg34.pdf
it has the voltage charts in the Second link
And he is some more 29 porn for you...
http://www.cbtricks.com/radios/cobra/29ltd_29ltd_st_29wx_st/graphics/cobra_29ltdwx-st_29ltd_sch.pdf
You need a copy of this:
http://www.cbtricks.com/radios/cobr..._st/graphics/29ltd-st_29wx-st_sm_pg1_pg11.pdf
http://www.cbtricks.com/radios/cobr...st/graphics/29ltd-st_29wx-st_sm_pg12_pg34.pdf
it has the voltage charts in the Second link
And he is some more 29 porn for you...
http://www.cbtricks.com/radios/cobra/29ltd_29ltd_st_29wx_st/graphics/cobra_29ltdwx-st_29ltd_sch.pdf
Yes sir!
Hope it is helpful.
The Good news is, its a 29.... there is SSSSOOOO Much information on those, should be a great project to get going again.
I'm currently playing with an Old Superstar 3900, and a SBE Catalina II 23 channel!
Hope it is helpful.
The Good news is, its a 29.... there is SSSSOOOO Much information on those, should be a great project to get going again.
I'm currently playing with an Old Superstar 3900, and a SBE Catalina II 23 channel!
Well, there you go.
If you play your cards right, you might get a great radio for the price of a couple components, your time, and your sweat.
Post up your findings as you go and I'm sure someone else may chime in with ideas
Yes, I am determined.
It is frustrating. I found out that with the different models of cobra 29 that the wire diagrams and audio chips are different. I am having a hard time finding the right wire diagram for my model. Unfortunately, I don't have to much spare time. But, I will keep posting what I find.
It is frustrating. I found out that with the different models of cobra 29 that the wire diagrams and audio chips are different. I am having a hard time finding the right wire diagram for my model. Unfortunately, I don't have to much spare time. But, I will keep posting what I find.
here is about every radio that cobra has put out. even has a wiring diagram for the 29radios. see if you can find what you need here. shows all the chips used by cobra. I have used this info for about every cobra 29 I have ran across. it also has the info for the newest cobra 29 radios. I put the wiring diagram here for you also so you do not over look it.
http://downloads.cobra.com/CB/Models/29-SERIES/
http://downloads.cobra.com/CB/Models/29-SERIES/29LTDwiring.pdf
http://downloads.cobra.com/CB/Models/29-SERIES/
http://downloads.cobra.com/CB/Models/29-SERIES/29LTDwiring.pdf
Thanks very much! It is very helpful.
The one thing I have not been able to figure out yet is where it shows capacitor C42. On my radio it is actually C41. And where the scamatics show C44 mine is C39 no matter what year the radio is.
I will keep posting. This is a slow works in progress for me.
The one thing I have not been able to figure out yet is where it shows capacitor C42. On my radio it is actually C41. And where the scamatics show C44 mine is C39 no matter what year the radio is.
I will keep posting. This is a slow works in progress for me.
i know this was a long time ago and CB tips and tricks is down and none of the links work but mine is doing the exact same thing but I didnt change with a mosfet maybe someone else did???? any information would be a great help thanks!
Ah, which exact, same thing?
Transmits but the audio chip gets hot?
Doesn't transmit at all?
A hot audio chip tends to suggest a damaged modulation transformer.
Maybe.
73
Yes no RX/TX and audio chip gets hot
I temporarily have the meter out had to stick it in a different radio so I haven’t been messing with it lately
I temporarily have the meter out had to stick it in a different radio so I haven’t been messing with it lately