Question about Motorola AXU4100 (10 Channels) 2-Way Radio

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How to replace the ptt button on a motorola rdu4100

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  • Motorola Master
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If you are referring to the external button on the radio, the entire front housing assembly must be replaced. If you are speaking of the internal PTT button on the component board you may want to send the radio for repair (approx. $79). Or if you are equipped with a soldering station, you can replace this component yourself by removing the defective part and soldering on the new switch.

Posted on Dec 24, 2014

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Posted on Jan 02, 2017

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How do i fix a ptt button on a motorola rdu4100 radio


I would go to www.motorolasolutions.com to find your answer.

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How to fix a ptt button on a motorola rdu4100


Contact Motorola Solutions.

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We just purchased the Motorola RDU 4100 radios. 8 of them to mix in with 4 others of the same model number. radios were working fine up until recently when 3 of the radios are now broadcasting the same...


Reset to Factory Defaults (Pg. 34)

Reset to Factory Defaults will set back all radio

features to the original factory default settings.

To do so, press PTT, SB2 and SB1

simultaneously while turning ON the radio until
you hear a high tone chirp.

Here is a link to the user guide: http://www.twowayradiosfor.com/pdf/RDX-Non-Display-manual.pdf
Programming instructions begin on page 36.

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1 Answer

Is it possible to fix a non working PTT button on a RDV2020


The PTT button is one of the common failure parts. It is replaceable, but best done by an experienced repair center.

The following things can happen over time:
1) The internal PTT switch can wear out from frequent usage.
2) The user begins to press harder to get the PTT to work, bending the PTT switch further away from the external button the user is pressing.
3) Plastic diaphram, if any present, gets broken in half, and the external PTT switch doesn't work anymore.

Several companies offer flat rate repair on this style unit for around $85.

Best regards.

Aug 02, 2011 | Motorola Mobility RDV2020 RDX Series On...

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I can hear what others are saying however i cannot talk to them. I know that i'm on the right channel. RDU4100 Motorola Walkie Talkie


The "others" have an Interference Eliminator Code ( aka PL or code) applied to their frequency. You would need to program the same "code" into your radio.

Here is a link to the user guide: http://www.mytoolstore.com/motorola/rdx_userguide.pdf

You can with the manual determine how to program and/or read-out the radios.

Best regards.

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1 Answer

Ptt button not working


rjapilan,

That job will require micro soldering and a replacement switch. I recommend these guys to do the work. Cell Phone Technicians

Sorry I could not provide a DIY solution but this task is not home friendly.

Good Luck

ERIC the PHONE GUY

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1 Answer

One way comm only


swap batteries if does not work this unit should need repair or replace, display blinking can be produced for power failure ( battery, contacts, circuits) or can be a controller issue.

Feb 07, 2008 | Motorola Talkabout T5500 (7 Channels)...

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