Monitor Issues - PM2 Model C

[Alta]

Hi,

The problem: I don't get any readings on the display when rowing. It only displays zeroes. I bought the machine used for scrap value but hope to get it to work. Apart from the monitor the rest of the machine is fine.
The monitor: When running the self test it looks ok. All buttons works. There was a battery leak, which is now cleaned up, but I can't see that it has made any damage since it was very limited. The monitor doesn't start up when I start rowing.
The sensor: When testing the sensor with the Voltmeter while rowing I get no reading(I think I'm doing testing correctly). (I also have a Model D with a PM3. I get a reading on that sensor when performing the same test). I also tested replacing the sensor with a new sensor, also two contact surface plug, but this didn't make a difference. The monitor still doesn't work and the Volt meter doesn't indicate anything.

Is it the monitor that is toast or what do you suggest? Any solutions suggested?

[Alta]

Hi there forum members, there must be someone out there with some experience or even just speculations. This is my first posting and I had hoped for someone answering my questions.

[Citroen]

There was a battery leak, which is now cleaned up, but I can't see that it has made any damage since it was very limited. The monitor doesn't start up when I start rowing.

Time to buy a retrofit PM3 or PM4 to replace your dead PM2.

There's loads of horror stories about broken, irreperable PM2s on here. Since you've got a cheap rower you'll be wise to spend a little bit of money to get a modern monitor. You may be lucky and find a PM3 user who's upgraded to PM4 and is selling their old PM3.

The PM3/PM4 has a whole lot of benefits compared to a PM2.

[Carl Watts]

There is basically no Voltage coming from the Model C sensor. It is just a coil of wire and should measure 100 Ohms while wiggling the plug to check for a fracture in the wires. The Voltage is just millivolts and 3 peaks every rev of the flywheel as the 3 magnets in it generate the voltage. You need a scope to see it, it is a very low signal.

If the sensor checks out then the corrosion has taken out the +3V supply to the Op Amp at the top of the board by the connector. This 3V supply is via a chip resistor directly below the lower battery terminals so it's a problem when they leak.

[Alta]

Thanks for the 'confirmation' of the monitor being toast.
I'll have to live without a monitor for a while. Since it's my back-up machine only used when I train with the spouse or a buddy I should be fine.
If there is anyone out there willing to sell a used PM3 monitor for a reasonable price please contact me. (I'm located in Canada).