Question about Cobra 29 LTD CB Radio

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Reparing 29 LTD

I need help fixing a 29LTD Cobra it is off frequency What part is the one to adjust the frequency

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Depending on what you mean by "off frequency". The 29LTD, like all other 40-ch radios is PLL controlled, referenced to a 10.240 Mhz crystal. The channels are all mathematically synthesized by a higher frequency VCO and the PLL controller chip. If the PLL detects the frequency is not "locked on" it shuts down transmission. If the frequencies are there, but "out of band" then I suspect that there has been modifications done to the radio to make it so. If you want the radio back to stock, undo the mods. If the radio is out of band, and no mods present, then there is a problem with the PLL. Sometimes that may stem from someone getting into the radio and "tightening all the screws". (the shops just LOVE those!)
If the channels are in band but seem a little off, there is some adjustment in the form of a small trimmer capacitor near the crystal. But to adjust it properly, you should employ a frequency counter.

Posted on Jan 24, 2009

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Hello there
Here is the diagram for you
Cobra 29LTD, 29LTD ST, 29WX ST
Documentation Project
CBTricks.com

TIPS:
You need to have Acrobat Reader version 5 or newer installed to view the files with pdf_1.gif icon.
If the files with jpg.gif or gif.gif icon will not display see the Site FAQ for help on printing, viewing and using this information.
25ltd_st_sm.jpg
Click Picture to See Close-up
cobra_29ltd_st_29wx_st_side.gif 29LTD ST Owners Manual pdf_1.gif
29WX ST Owners Manual pdf_1.gif
DIAGRAMS
29LTD ST Schematic Diagram pdf_1.gif
29LTD ST Schematic Diagram gif.gif
29WX ST Schematic Diagram pdf_1.gif
WX Schematic Diagram pdf_1.gif
29LTD, 29LTD ST, 29WX ST Factory Service Manual pdf_1.gif
Page 1 to 11
Page 12 to 34
29LTD Factory Service Manual pdf_1.gif
29LTD
29LTD Schematic Diagram pdf_1.gif
29LTD Schematic Diagram jpg.gif
29 LTD Classic Schematic Diagram pdf_1.gif(Courtesy of Rick Jackson)



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1- Shield
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3- Red
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Sadelta
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Hello there
here is a link for the scematic ok?
best regards michael

  1. Cobra 29LTD ST, 29WX ST 29LTD ST Owners Manual. 29WX ST Owners Manual. DIAGRAMS. 29LTD ST Schematic Diagram ... WX Schematic Diagram. 29LTD, 29LTD ST, 29WX ST Factory Service Manual ...www.cbtricks.com/radios/cobra/29ltd_29ltd_st_29wx_st/index.htm - Cached

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Hi and welcome to FixYa,

Often an error code "Y" would indicate test/diagnostic result of the antenna. A communication equipment thus equipped would test the SWR and display this error code if:
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Although am not familiar with the version of a Cobra 29LTD with this type of display. Could you pls post back the exact model of the radio, normally there would be two (2) more letters after the LTD something like Cobra 29LTD BT.

Good luck and Thank you for using FixYa. Happy Holidays.

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Scematic


Hi and welcome to FixYa,

Pls click on the schematic diagram for a Cobra 29LTD.

Good luck and Thank you for using FixYa. Happy Holidays.

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Cobra 29 Ltd


Hi,

Appreciate the direct "Ask Me" again.

The initial posting would still hold true, best would be:
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  • replace 2SC2069 with 2SC1969; and
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Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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