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These two radios have many similar features, but some which differ. For best results leave all the special features such as Qt filter, call alert, and interference eliminator codes, turned off or set to zero until you get the radios to function in a basic mode on just the same channel as one another. Then once you've found what works, you can experiment adding special features, if desired.
No, the charger is only usable to charge the rechargeable NiMH or Li-Ion battery which comes with the radio. Attempting to charge Alkaline rechargeable batteries with this charger could cause the to expode.
If your charger is not charging the batteries which came with the units, it could be you do not have the charger cord end plugged in all the way, or the batteries dropped below the initial charge level by setting on a store shelf too long. Most TalkAbouts come with a cradle style charger to hold the radio, and a possible plug to plug into the charge hole. Check all connections, and clean any battery/charger contacts with a pencil eraser. To re-initialize the batteries you would need to attempt 3-5 charge cycles by charging for 8-10 hours, then letting the battery rest for 8-10 hours, repeating 3-5 times as needed. If this does not bring the battery back to life, you need to replace the batteries.
Unfortunately yes. More often than not the pin/wiring arrangements are different, if not the physical sizes and dimensions, not to mention electrical characteristics such as impedance, common ground, ptt and VOX feature. If it is just an earpiece or headphones that is required, then any such accessory would do and it would be a matter of replacing the plug and/or rewiring the connection points.
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.
Most radios of this series would have Interference Eliminator Codes. The codes
incoming transmission not with the same code (number). There could be
similar radios working on the same channel/frequency, but if they do
not have the same code then neither one would hear each other. This
does not make a channel "private", rather it limits what one can hear
on that channel to another radio with an identical setting of the code.
In some Motorola models, pressing the Menu button until the small
numbers/code flashes would enable them to be changed. To change, press
the + or - keys. Pressing the MON key or setting the code to Zero would
enable the radio to receive and sound off all incoming signals with or
without the code.
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.
I don't think there is any easy way to check to see if the radios are stolen or not based on the serial number. Motorola may have some record of this assuming that the original owners reports the radios as stolen to them but most manufacturers do not track this information in my experience for these type of consumer radios. I don't know for sure whether Motorola would or would not have this information, but you certainly can check with them if it will make you feel better.
As far as what they are worth, similar new radios sell for around $80-90 per pair.
It would seem that this is a problem with the contact/switch of your Motorola T5700. When a headset, ear piece or external speaker is plugged in, an internal switch transfers the connection from the speaker to the external. This is better illustrated in the image below.
Initially, you can try an electronic contact cleaner. If that doesn't work, you may have to open the unit and manually scrape off any corrosion from the contacts/terminals or slightly bent it to improve contact.
Hope this be of some help/idea. Pls post back how things turn up or should you need addition al information.