Replacemetn mic on Motorola t6400

Just about any mic will do. I have used a Midland, Motorola, GE, Radio Shack and other microphones on these radio's. The mic element must be dynamic. Condenser microphones would require you to slightly modify the mic input circuit of the KLM to provide 5 to 10VDC through a 4K7 resistor to provide bias for the condenser element. It's easy to do if you have the skills to do it.

Here is a link to the T6400 user guide: http://www.giantintl.com/RadioPDFs/Outdated%20Manuals/T6400_User_Manual_E.pdf

Best regards.

If the problem is mic you need to replace it with new. Because it will not repair the but replaceable. The mic is not so expensive...open your cellphone and locate where the mouth piece where the mic is located...used 30 watts soldering iron to discard the mic...then replace with new mic.
If you don't know how or have doubt to do it. Just call a cellphone technician to replace the mic

Sorry, parts were never offered for this radio. However, if you watch ebay, you might be able to pick one up for parts, or even a better one than you have at a reasonable price.

Best regards.

The radio is easy to disassemble and has no hidden surprises, but I doubt you're going to like what you see once you get it apart. The large screws that are very visible on the outside hold both halves of the outside to the thick radio chasey and mother board.

Your volume problem is typical for older T6400s, and is caused by the speaker binding internally. Motorola does not sell the speaker separately and it is built into the case so you can't really just un-hook it and install a new one in it's place.

That's a shame, they are great radios.

Here is a link to the user guide: http://www.giantintl.com/RadioPDFs/Outdated%20Manuals/T6400_User_Manual_E.pdf

VOX is the word used for voice activation.

Here is an explanation of GMRS: http://en.wikipedia.org/wiki/General_Mobile_Radio_Service

Best regards.

Remove the battery(s) and allow the radio to set for 5 min or so, then reinsert the battery to reset the radio. If this does not solve the problem, you may have a bad or dirty on/off. Do not use any solvents on this. The best method of cleaning is canned air.

better to replace ur mic in your v3i if its not working.....put mic from another v3i...

You can find them on E-Bay. They are not easy at all to install. You need a heat gun with a low fan setting and a nozzle to focus the hot air on the area of the mic. The solder contacts are under the microphone. I guess it would be too easy if they made the solder points directly accessible. (LOL)

Once the board is removed from the phone, it is a small rectangular component with a small hole in it. You can find it on the board by orienting the removed board and comparing where the hole by the keypad is. The hole in the keypad housing is directly over where the microphone is on the board.

You have to locally heat the board around the mic slowly with low air pressure until it gets hot enough for the mic to desolder. While heating it, use a pair of tweezers to gently lift the microphone. When it is hot enough to desolder, it will lift right off. Be very careful when removing because neighboring components will also have the solder softened and can move if you even brush them.

After the mic is removed, clean the contact surface. Set the mic in place and then hold with light pressure with a small flat tip screw driver. Again, heat the area around the mic. Do not heat the mic directly because it will burn the microfilament that picks up the vibrations before the solder breaks down to fasten it to the board. If you have to add a little solder, be careful to not add too much. When the heat is to a point that the solder melts, the mic will sit flat to the board. If there is too much solder on the 4 contact points, it will mush out and potentially create a short.

FYI... V3 mic replacement is very high level.

If you don't want to try it yourself, I recommend www.wirelessunlimitedinc.com, www.myspace.com/wirelessunlimited.

Wireless Unlimited - Cell Phone and Computer Repair
10a-6p M-F EST - 423-913-0488

Hello. Your mic actually went bad from either liquid damage or a small bump. You need to have the mic either replaced at a motorola service center. Or you can do it yourself. It is quite easy. Just buy the mic from ebay for any old v series motorola phone v300 v400 v500, they are all the same. and just install it yourself. If you dont have a local service center in your area, cant find the part or cant do it yourself, look in my profile and i am sure we can help you out. If you found this helpful, give me a rating!