Board problems osunidata.pdf

[cboudreau]

I am a rookie, when it comes to building boards. But the http://www.pminmo.com/discrete/osunidata.pdf seemed easy enough. So I tried it, and I was able to get thru the first and second part to test the board and everything seems OK.

Until I get to this part
>>Using a jumper wire, connect JP1 pin 3 to Gnd, Probe IC1
>>Pin 13 Off,
>>Pin 12 On,
>>Pin 11 ON,
>>Pin 10 Off
>>Next IC2 pins should give you the following indications:
>>Pin 8 Off,
>>Pin 2 Off

Everything signal is backwards.

I have searched the traces and repaired what looked suspicious, but noting is changing. I posted pictures of it powered up with a 9volt. Can someone help me?

I assume the documentation has some typos, it mentions IC2 pin 8 and 2, But IC2 is the Power Regulator( with 3 pins) So I assumed it was talking about IC3 ?

And is Pin 3 of JP1 the Step Pin?

Can someone give me an idea what to try next?

Carl cboudrea@pressenter.com

[cboudreau]

I placed a switch between JP1-3(step) and JP1-4(ground) and thought that maybe there was a pattern. But if there is I can't see one.

When using a 9volt to test with, I connected 4 LED’s with resistors to simulate a load. When I power the circuit, the #1 and #4 light constantly. A quick press of the button changes the light too #2 and #3 on. There is no pattern, and there is always 2 LEDS lit at once.

Any suggestions would be appreciated.

Carl
cboudrea@pressenter.com

[pminmo]

Hi Carl,
I've now got a bulletin board: http://www.pminmo.com/phpBB/ The whole thought is that people can learn from others troubleshooting.

In regards to your first problem, every thing will be backwards if you don't get the ground at pin 3. Pin 13 of IC1 should be low as it is directly connected to pin 3 of JP1. Sounds like you are using a 9V battery? What did you hook pin 3 too? The simplest is to jumper it to the adjacent pin on the other row. That entire row is gnd/common/negative....

JP1 pin 3 is direction not step, pin 5 is step. There will always be two outputs switched on. X8-1 will always be the opposite state of X8-2 and X9-1 will always be the opposite state of X9-2.

[pminmo]

Carl,
I updated the documet to fix the typo, good catch.

[cboudreau]

OK so the board might be operating OK then.

so do I ground out the step pin to get it to step or do I apply the 5 volts to it. and how about the directon pin, do I ground it out to shift direction?

Thanks for you help.

Carl

[pminmo]

Carl,
Did you look at this page on my website? http://pminmo.com/troubleshoot.htm

Its the transition from ground to 5V that will cause the step. Gounding the direction pin will cause it to step the opposite direction of when the direction pin is a 5V. Keeping the direction signal the same during each step pulse will keep the motor stepping in the same direction.

[cboudreau]

Thanks Phil,

No I didn't see this before thank you.

I am seeing some erratic results, the motor isn't revolving smoothly. 5-8 switch presses, the motor either stalls of takes a step backwards. I don't know if this is the switch bounce or I have the motor wire incorrectly. I'm thinking it might be switch bounce, because there is no set pattern. If I am constant enough and fast enough I can some times get the motor to spin 1/4 rotation before it misses or steps back.

Carl

[pminmo]

switch bounce in all probablility. Without a circuit behind a mechanical switch, they open a close some times 4 or 5 times per make or break.