PM3 Issues

[Citroen]

My questions are:
1) Is this doable given the types of cabling/sensor etc I'll find inside?
2) Based on the newer one given zero ohms reading, can you speculate what might be broken? I need to work out the most likely issues with the 2 sensors which will help me work out which bit of the pickup and cable needs to be replaced.

Right now you're going to have to make do with the sensor that mostly works.

Take the pickup off and clean it. While it's off open the fan cage, undo the spindle and clean everything on the pickup side of the fan. Be careful not to dislodge the magnets when you clean the dust and cruft off them. Removing years worth of muck will make a difference.

https://www.concept2.com/files/pdf/us/i ... cement.pdf
https://www.concept2.com/files/pdf/us/i ... emoval.pdf
https://www.concept2.com/files/pdf/us/i ... cement.pdf

[nb99]

Hi

Thanks for your answer. No, I've done all this - all very clean in there, magnets working well etc. My question is whether the 2 pickup which are essentially 3 components (sensor, cable, stereo pin) can be cut/combined into one working one. And if so, given the reading of zero ohms at the pin of the newer one of mine, and no obvious cable damage, can anyone speculate where the problem is most likely to be?

Thanks

NB

[Citroen]

My question is whether the 2 pickup which are essentially 3 components (sensor, cable, stereo pin [sic]) can be cut/combined into one working one. And if so, given the reading of zero ohms at the pin of the newer one of mine, and no obvious cable damage, can anyone speculate where the problem is most likely to be?

What test equipment do you have apart from your digital multi meter?
The usual test for a sensor is the simple continuity. If tip and sleeve of the stereo TRS plug give 0 ohms then the coil the cable and the plug are good.

[nb99]

What test equipment do you have apart from your digital multi meter?
The usual test for a sensor is the simple continuity. If tip and sleeve of the stereo TRS plug give 0 ohms then the coil the cable and the plug are good.

I'm sorry, but I don't understand this. Earlier in this thread they said the multi meter should read 105 ohms at the plug, which my old pick-up does - it just seems to be unreliable (probably cable damage causing interference). The newer pickup reads zero, which if I understand correctly should mean it's not working. So why do you say a reading of zero means the cable coil and plug are good? Confused.

in terms of tools/equipment I have a well stocked DIYers toolbox, except soldering tools maybe.

[Citroen]

The test is whether it's open circuit (off the scale on the resistance setting on your DMM). There's no clear number for what the resistance of the inductive load should read when you measure resistance. That said 0 ohms could mean a dead short circuit.

Without having a soldering iron you are not going to be able to hack the wire off the good (but unreliable) sensor and solder it on to the newer sensor (working with 2.5mm TRS plugs and the thin cable isn't a good way to learn soldering).

The best advice I can give you is put the unreliable sensor on the rower and live with that until the Covid19 lockdown is done and you can buy a new unit.