Vias should go to pins 2 and 3, just which order needs to be determined.
Meter scales as I suspected. Follow the previous instruction on how to use it.
Ok,
After fighting this particular motor for almost three days, I decided to move on to the other Buehler motor I had. I popped the sensor cover to look at the circuit board and found this.
I was able to trace the leads on this one. Here is a table of the leads and what resistance I found for each one.
So I was able to build a new schematic.
From this it seems that pin 7 is the power lead, pin 5 is ground and pins 4 and 6 are the data pins.
Does all that seem to make sense?
Thanks to everyone who has helped me. This has been a fun, interesting and instructive three or four days. I think I learned more by doing this than I every would by just reading about circuits. Thanks again.
Next step is to hook it up and do some testing. That should be interesting and determine if I did things right.
datasheet.pdf (127 KB)
Found another of the original Buehler motors with speed sensor. The twin to my first one. This one was a lot easier to trace and as a result I was able to create a circuit diagram.
OK
Ran a quick test and the schematics are correct. I can read the pulses from both motors and from both data channels. Again, many thanks to everyone who provided input and assistence. It has been a very educational process for me.
ov10fac:
OKRan a quick test and the schematics are correct. I can read the pulses from both motors and from both data channels. Again, many thanks to everyone who provided input and assistence. It has been a very educational process for me.
Confirms what I said way back in post#13.
I dare say you were unable to get a reading from the vias due to some surface covering such as varnish.
In that instance it would be simply common sense to go from the adjacent solder joints.
Good to see you finally have it sorted though.
Still a mystery what pin6 on the sensor does but never mind.
bluejets:
Confirms what I said way back in post#13.I dare say you were unable to get a reading from the vias due to some surface covering such as varnish.
In that instance it would be simply common sense to go from the adjacent solder joints.Good to see you finally have it sorted though.
Still a mystery what pin6 on the sensor does but never mind.
The interesting thing is that I did try the solder joint on the adjacent component and still got no reading.
As for pin 6, most of the 6 pin optical sensor diagrams I looked at from digikey and a few other indicated that pin could be a NC. Actually they show it as pin 1. I think I included the datasheet I found on one that matched the physical characteristics of mine and it shows that. Check my post #9. I think that one had a single sensor so could only measure rpm.
Bottom line is everything seems to be running now and the work definitely was worth the time and effort if for nothing else for the learning experience.
If you can't get a reading from a via or soldered connection, touch it with a hot soldering iron to burn away the conformal coating.
Paul
Paul_KD7HB:
If you can't get a reading from a via or soldered connection, touch it with a hot soldering iron to burn away the conformal coating.Paul
Paul,
Thanks, I never would have thought of doing that. I will for sure give it a try next time I have one of these issues.
Paul_KD7HB:
If you can't get a reading from a via or soldered connection, touch it with a hot soldering iron to burn away the conformal coating.Paul
It's why I use a decent set of needle point probes.
Downside is I occasionally have blood leaking out of one of my fingers. 
bluejets:
It's why I use a decent set of needle point probes.
Downside is I occasionally have blood leaking out of one of my fingers.
Nice thing about needle pointed probes is you can pierce insulation to contact the wire without destroying the insulation and no one will ever know you did it!
Paul
Paul_KD7HB:
Nice thing about needle pointed probes is you can pierce insulation to contact the wire without destroying the insulation and no one will ever know you did it!Paul
Might be good for removing slivers of metal in ones fingers???