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There may be a solution for you if you try this: join yahoo group Specific to your radio Make & Model, give the expert team there as much detail as you can, so they can find a solution for you, and your can download manuals, schematics and other goodies for your radio(if available), and all this is free.
If the push to talk button is damaged. You will need to disassemble the radio to get to the circuit board. The PTT is usually surface mount soldered to the board. You will need silver electronics grade solder, a flux pen, a solder sucker or solder wick, a replacement PTT, a soldering iron 25 watts or greater, screwdrivers to match the screws in the casing during disassembly, a table mounted vise to hold the circuit board during repair/ soldering, a very fine grit sand paper to remove any oxidation off the terminals of the PTT for a perfect solder connection, and probably a magnifying glass to inspect the new solder connection with the PTT to the circuit board.
Most of the soldering tools can be purchased at radio shack.
if you have no experience soldering, I recommend going to YouTube and watch the videos posted on DIY soldering to get a good understanding of the whole process from start to finish. There is a huge amount of informational videos on the subject there. I could sit here and try to explain the whole process and why but as the saying goes a picture is worth a thousand words (but a video is worth a million ).
Being a repair shop in the Denver area I use to complain about the cost of buying Motorola software. It seems they come out with a new model as much as car manufactures do and of course you have to get new software. I received a bunch of LPE's in for repair from the EDAC Denver system and had to purchase the software just to tune the radios. M/A COM software covers more than one model but cost over a thousand dollars!! and you can only load it on one computer if you want to add more computers on the license it would cost me extra $800.00 each. I guess if you are a Ericsson, M/A COM shop and see hundreds of radios it is worth it. I ended up buying one copy to take care of my customer
I had the same problem with a number of the radios we have here. The trouble was the volume control pots had broken loose from the circuit boards. Some I was able to repair by resoldering and some needed new pots. We got parts from a local Motorola distributor.
I know these are old posted questions but here are some new answers..... Simplest first! Make sure the TX button is not engaged, if it is then the radio will not work correctly. Second would be a bad final or driver, this is a tough fix as these parts are tough to find, the parts are no longer made. A fix has been devised using MOSFETs but I have little details on this. Third but not last is to do with age and environment, a glue was used to stabilize parts to the boards, wire and coils typically. This "glue" will break down over time and exposure to moisture and become conductive, shorting out parts and also corrosive, making copper wire and traces come apart. Lastly, incorrect bracket knobs with screw threads too long can actually "crush" the PC board and break the PC copper traces. Dropping the radio is not good, cracked boards and broken wires in hidden places. Repairs can be made on all these but you need a tech that has experience to find these.....