Question about Magellan RoadMate 700 GPS Receiver

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GPS not able to lock (SNR often 0, sometime in thee 5-10 range)

Hi, I have yet another Magellan 700 that appears to have issues trying to lock to a signal. Even after resetting the GPS, manually setting the location, and waiting for 5-10 minutes for lock, it only works about 20% of the time. Even when it does find the location, it immediate loses it if I move more than a few feet. The AZ/EL/time appear to have real values (not sure how accurate they are, but they're non-zero). If lock wasn't achieved (80% of the time) the SNR shows 0. If lock was met (20% of the time), and then I move, the lock is lost (red icon, then black), a few of the satellites show a really low (values in the 5-10 range) SNR and the rest show 0. I've tried with 2 different antennas and it doesn't seem to matter. In fact, disconnecting the antenna doesn't seem to affect the SNR, as displayed on the GPS status screen. I sort of suspect the circuitry that RF modulates or amplifies the incoming signal, but I really don't know much about the internal technical details. Any suggestions? Thanks, --ken PS. Does anyone know how to interpret the last few columns of the GPS status (rev 4.0 software) screen?

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Me again...I took the unit apart and found out that there is a coax cable between the back board and the middle board. The cable has plug in connectors (v. small size) and the female connectors are soldered SMT on the boards. They are coming out quite one of them was literally ripped off the board. I soldered it with quite a fine iron,did a reset and I am back in a footnote my readings in AZ /El were all zeros!!!!

Posted on Jul 01, 2007


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Are you willing to part with it, I may be able to use it for parts [email protected]

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All zeros ehh? nice.. :) I'm not sure that having that wire that was "loose" solderd on was a good idea. Pretty sure your talkin about the RF cable from the main board to you I/O card (the card with the power connections). this cable isn't supposed to be soldered on, although I don't see what it could hurt as long as the connection was good before the solder cooled. If you open the unit up.. (again) and take out the I/O card (power card) . Look on the back of that circuit card and make sure that there are three small ICs' in a row at the position that sits in the outter beveled part of the back cover. I know this is hard to explain, but basically, if your missing an IC chip and you can't find it, then there's no hope.. look at some of my other posts and try various software resets. if you find the small IC chip I'm talking about (somehow) then call that professional solderer guy back. Let me know. -Daniel

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1 Answer

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1 Answer

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