Moto T5710 Disassembly - Transmits Carrier Only. No Modulation.
I'm trying to disassemble my Moto T5710 2-way radio to see if I can repair the Carrier Only/No Modulation problem. Besides the two screws in the bottom part of the battery compartment, where and what other screws/steps do I have to take to open the unit. It appears to be firmly attached at the top and will not come apart.
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Provided your radios were manufactured for use in the same country, ex: USA, your radios should be able to be programmed to match one another. The frequency number and code number must match on each unit. For basic operation turn off any special features such as the Qt filter, call alerts, etc. You can always add them back in later as needed.
Here is a description to the link for each user guide:
www DOT giantintl DOT com/ContentManage-new/manuals/Moto/T56XX_57XX_User_Manual_E.pdf
www DOT giantintl DOT com/ContentManage-new/manuals/Moto/T59xx_User_Manual_E.pdf
Sounds like a "short" if it affects modulation + power. Try to inspect board with magnifier for solder bridges, and bad resistors. Change a few resistors near back with new ones. take out slugs near back finals like L10 or L20's not sure if its same as Uniden Pc68xl. but try that. I found turning L19 up to top gave great Modulation. clip D9, Sread coils 1/16 inch in back. Try to get lower carrier. Carrier does not mean anything much. Modulation is what you need. With less Carrier it may cool down that chip. It may be too wound out.
The electronics in the transmit / recieve circuitry (RF = radio frequency) work very differntly from those in the display and control circuits, which prob ablyexplains why the display works, but not the rest.
The major problem with water in RF circuits is that even after it dries out, it leaves a residue, or worse still some corrosion, which adversly affects the tuning of the RF circuits.
It may be worth trying to dry it out a bit more - put it somewhere warm but not humid like near but not too close to a central heating boiler, for a few days. However, I suspect it is now beyond repair.
electronics degrade with time there are corrosive cemecals in electronics the most comon one are the capacitors they leak and cause problems the newer the unit the less storage life it has due to inferior chinese parts good luck!
Hello Rob55spiral, Most common malfunction in no modulation is the microphone. Swap out with a known working mic. #1 If problem is corrected, aquire a DVM and repair the broken cable connection in your microphone. #2 If still no modulation you have an internal componet malfunction. Please inform me of results.