[ropewrench]

Here goes
when the Z axis is not being stepped the voltage at C17's positive terminal
should be at a logic 0 ( no more than +1V)

C17 is 5 volts but so is C15 C16 and C18

I do not have a probe

And there is a problem with the LPT port

I am using turbocnc / Dos

Z step 7 No change 3.357 v
Z direction 6 No change 3.357 v

X step 3 3.367 v Drops while moving
X direction 2 OL to 3.365 v

Y step 5 3.367 v Drops while moving
Y direction 4 OL to 3.365v

I have another pci card wiht a 25 pin but I do not remember how to get it to boot in Dos
Windows sees it but doesn't have the drivers for it

Thanks

[john-100]

your test results explain the voltage on the capacitors C15 to C18

I had expected the step signals to be at 0V until you step an axis
so the SLA7078M steps on the positive going transition
what instructions did you receive from Hobbycnc about setting the step signals as active high or active low ?

If you post a picture of the PCI card and the main logic IC
some one may be able to help you find the drivers

John

PS this test circuit from Gecko drive is usefull to test stepper drivers without a PC

http://www.geckodrive.com/gecko/imag...tionTester.jpg

[ropewrench]

hee they are

[ropewrench]

Stand down

ALL IS GOOD

Emerancy called off

Grabbed moms old XP machine loaded it with my junk and Z now works

I just want to set back and let them spin

Lpt went bad
I probaly did something I shouldn't.

Thanks for all of you guys help

I did learn alot

Thanks again
Kelly

[john-100]

thats great news
now the fun starts

did you find out from Hobbycnc if the step and direction signals should be active high or active low ?

the current reduction circuit only works correctly with the correct step signal

now you have a working PC it doesn't matter now but
in your photos the lables cover the IC numbers I was looking for
on the old card the Winbond IC starts with W83
it may be a long shot but a web search may find the driver software

John

[ropewrench]

yea john

Set Step Pin State to "Active High"
Direction Pin State Depends Axis Movement. Can be Plus or Minus


I looked for a driver for both of them
if i dig long enough i will find my old tape back up

[ropewrench]

Stand down

ALL IS GOOD

Emergancy called off

Grabbed moms old XP machine loaded it with my junk and Z now works

I just want to set back and let them spin

Lpt went bad
I probably did something I shouldn't.

Thanks for all of you guys help

I did learn alot

Thanks again
Kelly