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Midland Alan 40 fm/am , Tranmission is intermittant,will only transmitt when is warm,Reception can sometimes fade away then no transmission.But does transmitt clearly,have tested 10 pin audio amp, pin 2 reads 1.8,have tested large eletro capacitors all ok , sure hope you can help me make this set breath again for me,hope to get next time im on-line.With respect. ali

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  • aligtop May 19, 2011

    Yea ok, i gotta get a can of that freeze spray tomorrow,would it be possible to be the 10 pin amp working bang-bang .

    Thanks again Talk tomorrow.

  • aligtop May 23, 2011

    Hello again, No i now cannot get the set to transmit at all,not sure if it's recieveing or not.what does it sound like to you ?

  • aligtop May 24, 2011

    Midland 40 chan am/fm, im not getting any transmission.It was working intermittingly both recieveing/trans but now i cant transmit.
    Have checked all main drive transistors,ok.all large electro capacitors checked,ok. mikeraphone checked,ok.Hope you can help me.cheers.

  • aligtop May 25, 2011

    Thanks Tony,wll get on that,an get back to you,.....Cheers

  • aligtop May 25, 2011

    Hello again,hear is the latest on the cb.

    press the mic an Transmit,then recieveing reception is poor, turn set off/on reception back to normal.

    PA done 2 tests,,just to make sure,On( local Mode) set, nothing,put on DX mode on the mic, blows your mind away with a Deafing squell/pitch

    Microphone Is changeing chans, locks / unlocks , push button on mic tight , ok inside i checked it past ,i still cant get a grip on this one T, why it's this way, is'nt true that transmission goes through the 10 pin Audio Amp.? Have a think on it ,an get back to me, will chat soon.

    Thanks again Tony

    aligtop

  • aligtop May 25, 2011

    hiya bob, took the mic appart everything inside was tight, clean , good con,but as you say some mic's receive an transmit .

    Big respects to you bob, will let you know the outcome.







    aligtop

  • aligtop Sep 07, 2011

    got your email, thanks man,wil try out,got a wharfedale lcd26 hdm tv at the mo,an it's not showing any led light when you plug in turn on,done some testing an found that im not getting a reading of continuity in one transformer of 4.can you advise,is it common ? respect to you , cheers.

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10 Answers

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You can try few things.
1. Add a longer and powerful antenna.
2. Open your transmitter. Please change the coil that is on the ferrite core.
3. Use new batteries.
4. Change the signal amplifier with a low noise high gain pre-apm.
This will solve your problem.

Posted on Sep 05, 2011

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The outputs in the circuitry are getting weak causing the unit to fade in and out
It will need to be serviced most likely with a new board

Posted on Sep 14, 2011

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HI.If you receiveD low frequency signal you may as well replace the crystal accesory to 10.7 mhrtz value.it has color brown. You may as well try to bring the equipment to a higher terrain.place wherein it recieves maximum frequency signal.This is a frequency signal capable in receiving frequency signal.Try to open the unit then replace that accessory that has color brown since this crystal will responsible on receiving maximum frequency.Hope this idea helps.

Posted on Jul 20, 2011

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Try to check the resistors beside your 10 pin audio amp and driver transistors.

Posted on Jun 27, 2011

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OK well what we do is warm the set up, and using a stuff called "Freeze Spray" we spray individual suspected components now the one that stops,or causes an obvious problem, is the one that's most likely faulty or involved, and stopping it from working, usually this is the culprit and replacement usually fixes it.
It also maybe a bad solder joint? So i t always pays to give all suspect or "Funny" looking solder joints a quick, "Lick of the iron" and reflow those joints again just to be sure...
Things that get hot, are usually the output semiconductors, ,aim audio amp, and power regulator and pass components so check here too.
As usual always start and check that the power supply voltages are all correct as if they aren't well nothing else can be? Check all Electro Caps, Vregs, Zeners, and output semis...

Posted on Jun 17, 2011

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Good day!


If your machine OK when its warm,,

the solution I suggest is to re-solder all parts using soldering iron and soldering lead..


after that try to test it by powering it on again..


thank you and don't forget to rate my answer..

If you have follow up question or comments Just click (add a comment)

Posted on Jun 09, 2011

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Hi:
Usually when units tend to operate when it gets warm, this is an indication of a thermal intermittent problem, usually common to poor or cold solder joints on an IC in the unit, I suggest you check all solder connections especially around any large Ic's mounted on the circuit boards and the power supply area.

Posted on May 27, 2011

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Have you checked the mic at the connection to the radio some units need the mic to
transmit and receive if the connection is bad that might be giving you the problem

hope this helps you
bob

Posted on May 25, 2011

  • robert DIBBLE
    robert DIBBLE May 26, 2011

    other than what i said i cant think of any thing else

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  • Sounds to me like your finals may be blown or the voice chip.
  • Plug an external speaker into the external jack in the back and key the mic. Can you hear your voice? Then the voice chip is good. If not the voice chip is bad.
  • If voice chip checks out then I would replace the final transistor.
  • Make sure to check the mic and if you can confirm with a spare that it is functioning properly. A bad mic can mess things up a bit too.

Regards, Tony

Posted on May 25, 2011

  • Iron
    Iron May 25, 2011

    Sounds good.





    Regards,

    Tony

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IF you are having a fade problem and intermittent issues that appear to be related to heat, Get a can of freeze spray and have it till you find the component that shows reaction to the freeze.

Posted on May 19, 2011

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