Question about Motorola T5000 Two Pack 2-Way Radios with 5 Mile Range

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Motorola T5000 Rx problem

I have a T5000 that can't receive but can transmit. Is there any schematic diagram for the PCB that I can refer to or what can I do to restore the problem.

Thanks in advance

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  • Peter Timbol Jan 14, 2008

    The speaker is ok because it has all the beeps and sounds.

    I had already sprayed contact cleaner on the volume control.

    Am also transmitting from 2 other T5000 radios. This unit just stopped receiving two days ago.

    Your last suggestion is what I actually feared, and it seems to be that is the problem. Am in need of a schematic diagram of the board so I can test which part I can replace if possible (I have other busted T5000s lying around). I just need this as a back-up radio. The bosses are taking forever to approve my request for new ones.

  • Peter Timbol Jan 16, 2008

    This doesn't have squelch control since it is just a Talkabout radio. Am usually in the Raon area but the bosses don't want to spend money for repairs because they classify this as disposable stuff. Am just repairing it as a back-up.

    If it is the YD3361 chip, then this unit basically is junk. Will just take the PTT and transfer it to another unit that is working but with a busted PTT.




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Hi SirDrag,

Your concern could be the internal speaker of the T5000. This could be verified by attaching an external speaker or a headset compatible with the unit through its accessory jack. Should this be the case, it of course would require replacement. Though Motorola speaker for this model is proprietary in design, those made for Alinco, Icom, Kenwood and/or Yaesu should also work. The only concern would be getting one that will fit the physical mounting limitations of the front cover.

In some instances, it could be the volume control developing blind spots along its carbon pad. A spray from an electronic contact cleaner should do the job (albeit temporary).

It is also possible that the Interference Eliminator Code setting is different with that of the TX radio.

Worst case possibility is a defective electronic component (such as the op amp) which would then require the professional services of a qualified communications technician.

Hope that this be of help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Posted on Jan 14, 2008

  • Louie  Role
    Louie Role Jan 15, 2008

    Copy, if at all possible, have you tried using the radio without the Interference Eliminator Code or Carrier Squelch set at 0?

    Since the beep works, chances are the audio amp is OK leaving us with only the auto muting (code activated) and/or the if/demodulator stage.

    I will not include the RF stages since I am assuming that you have tested its reception with the TX radio pretty close to the non RXing radio.

    Just to share, my experiences with similar faults on other models of Motorolas usually centers around:
    crystal filter - normally blue or yellow/orange in color with 3 terminals
    IF/Squelch IC - MC336? - usually underneath the logic/display board
    Tone en/decoder IC.

    If you're anywhere near Gonzalo Puyat (formerly Raon), there are a couple of establishments accepting Motorola repairs.



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