Question about Uniden GMR638-2CK (22 Channels) 2-Way Radio

1 Answer

My radio turns off automatically as soon as I hit the talk button.

It still receives, scans, changes volumes and even enters the menu. As soon as I hit Call or Talk, it shuts off. If I hold the power button then hit either of the two, it works, but then it shuts off because I'm holding the power button.

I know it can still send because I found a trick, if I shut it off then turn it back on and still hold the power button, I'm able to talk and call, it's just a nuisance to have to do so.

Please help, is there anyway to reset the device?

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  • 2 more comments 
  • jimmycudo Aug 26, 2008

    I just swapped the batteries and cleaned the contact prongs (didn't bend them, they had plenty of contact space) and it seems as though battery or power loss problems are the issue at hand.

    How long do you think it would take to reset if I left it without a battery?

    No problem by the way, thanks a lot for the fast response. :)

    Would you like me to post a video of the issue?

  • jimmycudo Aug 27, 2008

    Here's a video of the issue. Sorry about the voice, I'm still not fond of the interwebz. :D

  • jimmycudo Aug 27, 2008

    I appreciate that, but can you help me get past it? :D

  • jimmycudo Sep 05, 2008

    Will do, I'll leave them to charge right away then. Thanks a lot, I'll let you know how it goes Benimur. :)



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Appreciate the direct "Ask Me".

Initially, I would assume that you have a pair and that the problem is with just one.

Based on this, I would suggest switching the NimH batteries. This is to eliminate the possibility that is is a battery/charging issue. Additionally, pls try to verify that the battery contacts both on the radio and the batteries themselves are clean. You may need to scrape them off to assure positive contact. Further on the radio's battery terminals, you may need to slightly bend them (or stretch if spring type) to provide more pressure in the contacts.

Incidentally, removing the battery for an extended period of time is enough to perform a reset.

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.

Posted on Aug 26, 2008

  • 1 more comment 
  • Louie  Role
    Louie Role Aug 26, 2008

    Posting a video would help others of similar concern and would be appreciated.

    The reset by battery removal, an hour would way more than enough.

  • Louie  Role
    Louie Role Aug 27, 2008

    Thanks for sharing this video. I am sure many would benefit and relate to the problem at hand and have an idea on how to go about it.


  • Louie  Role
    Louie Role Aug 28, 2008

    What has been tried so far:

    • switching batteries;

    • cleaning/scraping battery contacts/terminals;

    • reset/battery removal for extended period.
    Others that you can try:

    • verify that battery level indicator shows a full charge;

    • disable automatic power save feature;

    • use Alkaline batteries;

    • bend the battery terminals as initially suggested;

    • open the unit and check for any corrosion on the battery wires or on the PCB.



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To adjust the speaker volume, press up/down on the base unit.

To change the ringer volume:
Make sure your phone is OFF (not in talk mode).
Press the MUTE/PROG button to go to the main menu.
Press CID/VOL (up or down) button to scroll to "HANDSET SETUP".
Press MUTE/PROG button to confirm.
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Press MUTE/PROG button to enter the menu. "SET RINGER 1HI 2LOW 3OFF" shows in the display.
Use the touch tone pad on the handset to select 1, 2 or 3, or use the CID/VOL (up or down) button to scroll to your selection. HI is the default setting.
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In order to get the most out of your new radio, read this reference guide completely before attempting to operate the radio.

Turning the Radio On and Adjusting the Volume

1) Press and hold the key to turn the radio ON.

2) To change the volume level press the volume/monitor up or down key to increase or decrease the volume level.

3) Press and hold the key to turn the radio OFF.

Adjusting the Sound (Key Beeps)

Your radio emits a beep each time one of the keys (except for the PTT button and call key) is pressed.
The sound of the Key Beep will increase or decrease depending on the volume level setting.

To turn OFF this beep:

Press and hold the call key while turning ON the radio.

To turn ON this beep:

Turn the radio OFF and ON again.

Choosing a Channel

Your GMR325-2 radio has 22 channels you can use to talk to others. In order to speak to someone,
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To choose a channel:

Press the channel/scan up or down key to increase or decrease the channel number displayed.

Channel Scan Feature

Your GMR325-2 radio has a channel Scan feature that allows you to easily Scan all 22 channels. When an active channel is detected, the unit will pause on that channel until the channel is clear. Then after a 2 second delay, the unit will continue scanning.

Pressing PTT button while the Scan is paused on a channel will allow you to transmit on that channel.

To turn ON channel scanning:

Press and hold either the channel/scan up or down key. The channel number on the display
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To turn OFF channel scanning:

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To talk to others using the radio:
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While you are transmitting the tx icon is displayed. To avoid cutting off the first part of your transmission, pause slightly after pressing the PTT button before you start talking.

2) When you are finished speaking, release the PTT button.You can now receive incoming calls. While receiving, the rx icon is displayed.

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Your GMR325-2 radio is equipped with a call tone that will be transmitted when the call key is pressed.

To transmit the call alert tone, press the call key.

The tone will automatically be transmitted for a fixed length of time.

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To turn ON monitor mode:

Press and hold the volume/monitor up or down key. The rx icon will blink.

To turn OFF monitor mode:

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Your GMR325-2 has a unique circuit designed to dramatically extend the life of the batteries. If there is neither transmission nor an incoming call within 2 seconds, your radio switches to the Power Save mode. The radio is still able to receive transmissions in this mode.


Press and hold the call key until the "L" appears. After 1 second, the LCD will return to the channel display.
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To turn OFF Roger Beep: Press and hold the channel/scan up Key while turning on the radio.

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