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incosistent speed readings on Ergobrain 9(3 posts)

incosistent speed readings on Ergobrain 9Luis
Aug 25, 2001 9:26 PM
I don't know how to begin diagnosing this problem, and would appreciate your thoughts.

Over the last week the speed display on my one-year-old Ergobrain 9 have been jumping around. They'll go up to a truly impressive speed--like 30-something (on the flat--if only!) then jump down to a more realistic 20. The low battery indicator is not on. The distance reading seems to be correct.

A few months ago I switched to Kyseriums, and don't have Mavic's oval-spoke magnet. I mounted a regular magnet with a zip-tie and it was working ok. I've moved the front sensor to within 1mm of the magnet.

I'm about to go off on a 500 mile ride in a couple of weeks, and would like to be able to rely on my speedometer. If there's a suggestion that the unit itself is the problem I might just be able to get a replacement from Campy if I get on it on Tuesday-when the LBS opens.

Thanks for your suggestions.
re: incosistent speed readings on Ergobrain 9mackgoo
Aug 26, 2001 9:28 AM
I would have questioned the positioning of the sensor and magnet. If it OK as you say start talking now to LBS. Get on the horn monday, they are actually very helpfull as far as tech support goes.
re: incosistent speed readings on Ergobrain 9Robert2
Aug 26, 2001 11:22 PM
There are two possibilities, either the magnet/sensor setup is not working properly, or the unit is starting to have problems. From what you describe, I would look more at magnet/sensor problems. One possibility is that when you moved the sensor around you broke the wire, so it's making inconsistent contact. Another possibility is that the magnet you are using is not compatable eith the sensor's internals workings. If the magnet/sensor are centered, try moving one or the other so the edge of the magnet passes the sensor, and vice-versa.

If moving the magnet/sensor doesn't work, check into the possibility of a broken sensor, then the unit itself.