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Member postings for Stephen Packer

Here is a list of all the postings Stephen Packer has made in our forums. Click on a thread name to jump to the thread.

Thread: Lathe RPM meter not working
24/12/2020 16:18:39

An update, I replaced the regulator and it supplied a steady 5v to the display board and to the sensor. I had a look at the display board and couldn't see anything obviously wrong but without a circuit diagram etc. I'm a bit blind (and very out of practice with electronic fault-tracing).

I ended up putting my hand in my pocket for another display (£18). Fitted it this afternoon and it's working fine.

Maybe the display board died and took the regulator out? Anyway, fixed for less than 20 quid.

15/12/2020 18:23:31

I've got the same lathe... and the same problem.

I've done a little fault checking and the regulator's definitely dead.

However, removing the display unit and supplying 5V to it doesn't cause it to light up and when the inputs to the display are 5V, Gnd, pulse sensor, pulse sensor I would have expected just 5V and Gnd should have resulted in a '0' display.

The capacitor across the regulator output and ground seems to be OK so I'm at a bit of a loss why the regulator died and suspect it could have been the display board (although it drew negligible current from my bench power supply).

I'll have another look tomorrow but will replace the regulator and see what happens; I don't really want to buy a new display board if I can avoid it!

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