Most of the wired cateyes use the same mount and sensor, which is available as a spare part. I do not think its your battery, because the screen will start going dim when the battery needs replacing. Use creative wrapping around a brake cable or similar to get your wire up to the handlebars while supported. Note when reassembling, use glue to provide sealing from moisture, and to reinforce where the wires come out of plastic - generally these are prone to breaking here. A dab of solder and some glue were the only other parts used. My reed switch was faulty, so I replaced it with a $2.50 item from the local electronics supplier and it worked fine. I did not get a photo sadly, but the only component on the board was a through-hole reed switch and two holes for the wire to attach. In mine, there was a small black plastic version of a "guttering downpipe standoff" which clipped over two plastic studs and held a tiny circuit board in place. There may be fasteners or clips or perhaps simple friction holds it shut. Any should be repaired and then continue troubleshooting.ĭown at the sensor, if you can pop the unit open and see the reed switch then do so. If this doesn't work, examine the wire for any bumps or sharp folds or abrasions. This should go open circuit again when the magnet is removed. Move a magnet past the sensor, and this will close the internal reed switch, which will make your meter beep, or the ohmmeter read a number, probably about 1 ohm. The reading should be infinite ohms, which means no connection. You can troubleshoot the harness too - connect a continuity sensor (either a multimeter with a beeper, or an ohmmetermm or a small lightbulb and battery) to the pads on the receiver socket, the plastic holder that stays clamped to your bars. Rapid shorting of these pinheads should make the computer see wheel rotations, and give an approximate speed. (note the pictured connectors are dirty and need a clean.) If you think the head unit might be acting weird on its own, test it out of the harness using anything metallic to short the two pads on the back. I'm not sure exactly how many blips the headunit requires to calculate a speed, but from manual testing its at least 3, maybe 4. The extra pulses mean that something is blipping more than once per wheel rotation. poor quality soldering at either end of the wire - a cold joint.an intermittent connection to the head unit inside the socket on your bars.a break in the conductor inside the wire.Otherwise, your description tells me the wiring is mostly working but the head unit is getting multiple signals. Most sensors have a line that is the middle of the sensor, so that's where the wheel magnet should be centered. Its probably fine, but this is far and away the easiest thing to check. The curious thing about those numbers is they're some multiple of the speed I was travelling.įirstly, start by checking the magnet. I'd be riding along at 30 km/h and the speedo would flash to 45 or 60 and rarely 90, and I never saw it but the MAX SPEED was at 120 km/h. I've been through this exact situation with a Cateye Velo 7 and it did very similar things. Or to stop from breaking the next one.Ĭomputer is like this one with wires, not cellphone or GPS. Probably out of warranty and I want to learn how tofix it. How do I troubleshoot my bike computer? I know is not a Garmin or wahoo or any flash thing, but is only a year old. Yes it has been ridden in the rain but that is what these are designed for and there is not water mist inside the screen. The clock works fine, shows the correct time all the time. Now it stops completely - only shows a speed for a few seconds then back to 0. No water anywhere, no rust, no damage, nothing wrong. I check closely - battery is okay but I change it anyway. I disregarded this and keep riding.Ī month later it starts cutting out, reading 0 km/h or numbers like 6 or 9, where I am riding at about 20 km/h on the flat road. That is, if I was doing about 20 km/h it would blip to 30 or 40 or 60 and then drop back to my real speed. It worked fine for months, and then started "blipping" to double my speed. It is a simple read out of velocity and clock and has no fancy functions at all. I have a cheap velo cycle computer made by cateye.
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