Hello, I have a Harris XG-75M, which has been working great with no problems for months now. Saturday morning turned it on, and got the " Warning! Lost MRU " on the control head. I tried a different control head, same thing. I can read the radio, but it fusses when I try to write to it. Not sure of what is going on. Any suggestions ? Thanks
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Harris XG-75M "Warning! Lost MRU"
- Thread starter Trooper78
- Start date
If it is a remote mount radio, try a different CAN cable. Make sure you have a CAN terminator on at least one CAN port with a remote or dash mount radio. Also if it doesn't have the latest control head firmware you could try to update that, as Harris has resolved a few issues with the CAN bus in the past CH-721 firmware release.
ElroyJetson
Getting tired of all the stupidity.
What was the feature package in it? Just asking because I've got like 50 of them with P25 Phase 1 trunking and you could probably get one from me so cheaply that you might prefer to do that rather than try to recover yours.
It had phase 1 and 2....if I could recover it, that would be great.
Lost MRU means that the Main Radio Unit is not talking to the control head. Check the power on the main radio. Typically, the control head will have power to display the message, so I'd check the fuse on the main unit.
Is the CAN terminator still in place? If it is missing or bad, that will cause the same problem.
I hope your son is okay.
OK, so I tried a bunch of different terminators, no luck. I converted it to a dash mount, and it still shows Lost MRU on the screen. It also keeps booting, over and over. Any help to recover it, would be greatly appreciated.
Did you diddle the bits on the control head with a terminal emulator and make it a dash mount? If so and if it still doesn't work its probably a broken radio.
It has been programmed with an uncappable version of flash code. I made that mistake once.
The XG75 radios are more sensitive and less forgiving than older M7300 radios. The version of RPM has to Match the Firmware range.
I was able to recover by programming a later version of firmware.
I was able to recover by programming a later version of firmware.
I have RPM 14C05. Would you have a copy of the latest firmware, that you would be willing to share. I would greatly appreciate it.
Radio_Lab_MIA
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- May 9, 2023
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Four fuses by the connectors on the PK board tend to blow when the DB44 DB9 is removed hot. They are tiny surface mounts, three one-amp fuses, and one three-amp fuse. I repair these all the time on the XG75. The three-amp fuse is behind the cables. Check these first for lost MRU. I can guide you in troubleshooting if that is not the issue.
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ElroyJetson
Getting tired of all the stupidity.
They're very picky about good grounding between the radio and the programming computer. I lost an M7300 to a data corruption issue and gave up on it. Why waste my time on it when I have so many more spares?
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