Scan does not find spd sensor

[daidnik]

Just rec'd new Newton unit.

Installed per instructions & video.

Did quick setup in Issac; entering weight, ht & other parameters.

"Scan" function in "Setup" does not find any sensors.

Check CR2032 battery voltage and it is >3.0 VDC.

Put head unit in close proximity to chainstay transmitter and still get same results.

Now what? Defective unit or am I missing something?

David

[racerfern]

Make sure you pass the magnet by the sensor so it wakes up.

[daidnik]

Okay, that seemed to work.

Just to get this straight, do I infer correctly from your message that during the "scan", one must spin the rear wheel as well to get a successful handshaking in the scan?

[Velocomp]

If you're still having problems, do a Hard Reset of your speed/cadence sensor. Remove the CR2032 battery, insert it backwards for a moment, then reinsert normally.

Then, make sure to wave a magnet past the speed sensor prior to Scan.

This should fix things.

[racerfern]

You should only have to this once, but the key is that the sensor has to be awake in order for Newton to find it. The same goes for the HR strap which needs to be on you and picking up your heartbeat so it awakes and is found by Newton.

[daidnik]

An answer to the question in the previous message about spinning the rear wheel would be more helpful.

David

[racerfern]

During a scan you don't need to spin the wheel but you have to have the magnet pass the pickup point so it wakes up. No need to spin and spin.

[daidnik]

Proximity guidelines of gap between wheel magnet & pickup?

I heard or read something about "2 coin widths" which seems to equate to a bit more than an inch max. Is this correct?

A numeric value would be more clear.

[racerfern]

Not coin width, coin thickness. About 1/8"

[daidnik]

Wow, that's close. With the chainstay mounting of the unit, do you just angle it inward on the bottom to achieve the >1/8" gap?

The height above the stay with the zip tie anchoring is not as stable & rugged as I would like.

Given your gap criteria, I now see why it wouldn't work on the bike. Now I'll have to re-install the Xmttr unit with the smaller gap.

I have confirmed that this DID wake up the Xmttr unit on the table.

Thanks

[daidnik]

Whoops, I meant <1/8" gap.

[racerfern]

Assuming you have the combo sensor, set your cadence part so it works with the cadence magnet on your left crank arm close to where the pedal attaches. Put the cadence pickup so that it is within 1/8". Then loosely attach the magnet on a spoke and loosely attach the speed pickup section under your stay. Now align the magnet and snug it down. Finally move the speed pickup to within close proximity. Tighten the zip ties and you're done. Makes sense, doesn't it?

[daidnik]

All makes sense.

I guess if the speed sensor pivots inward closing the 1/8" gap, it will buzz on the spokes and I'll know & fix it without damage to the unit.

[Russ]

daidnik,

Regarding damaging the sensor, make sure you install it so that it hangs downward so that if the magnet or spoke hits it will move away and not get caught in the works! It may damage more than the sensor

Regards,
Russ

[daidnik]

Understood