Model B sensor and PM1 testing and repair

[hbar1054]

Hello all,

I found some posts in the forum on PM3 sensor wire and pickup repair, but scrubbing through the forum I couldn't find much information on Model B sensor and wire repair or PM1 monitor repair.

My sensor wire is broken, and I would like to reattach it with some solder. Is there a quick way to test if the sensor is picking up a good signal, i.e. what would I be looking for with a multimeter. I could also get a cheap oscilloscope to check the signal when the wheel is rotating. What would be good signal levels? Looking at the connector it seems there should only two conductors -- is it just a simple coil at the sensor?

Also I have no idea whether my PM1 is working or not, I found found some instructions on cleaning up the breadboard at https://www.concept2.com/service/monitors/pm1/manuals

If anyone has any other suggestions/experience on bringing up/resuscitating a PM1 and would be willing to share that would be greatly appreciated.

-doug

[Carl Watts]

Just buy a new sensor, to hard to repair and a new one is as cheap as chips in the USA.

The PM1 is really too old now, it really is not serviceable. As long as the battery terminals are clean and you put 3 new SR44 batteries in it and reset it as per the instructions on the end of it it will either work or it won't.

The whole Model B rower has realistically had it day now. The Model C was a big upgrade.