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Author Topic: Low voltage on stepper port issues  (Read 2062 times)

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Re: Low voltage on stepper port issues
« Reply #10 on: March 24, 2018, 10:32:53 AM »
I'm bad with these terms, What doe BoB stand for?

Offline TPS

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Re: Low voltage on stepper port issues
« Reply #11 on: March 24, 2018, 10:33:41 AM »
breakoutboard
anything is possible, just try to do it.
if you find some mistakes, in my bad bavarian english,they are yours.
Re: Low voltage on stepper port issues
« Reply #12 on: March 24, 2018, 10:51:03 AM »
There are no other ways to do the wires to get it to work that i know of.
But is there any way to control the output from the mach3 program, or something else we could do to troubleshoot it?

Offline TPS

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Re: Low voltage on stepper port issues
« Reply #13 on: March 24, 2018, 10:57:37 AM »
you can check the direct signals from the parallel port (pin 6/7 from 25pole Sub D), with oszilloscope.

anything is possible, just try to do it.
if you find some mistakes, in my bad bavarian english,they are yours.
Re: Low voltage on stepper port issues
« Reply #14 on: March 24, 2018, 11:00:05 AM »
I'll keep that in mind and try it as soon as I can.
Thanks.

Though, could it be the parallel port that is doing this? To get lower voltage at the card.

Offline Tweakie.CNC

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Re: Low voltage on stepper port issues
« Reply #15 on: March 25, 2018, 02:00:20 AM »
Quote
Though, could it be the parallel port that is doing this? To get lower voltage at the card.

You can check if it is the parallel port that has the problem...

Note the two pins that you are using for Z axis.
In Ports and Pins / Motor Outputs configuration swap X axis pins for Z axis pins.
If Z axis now works and X axis does not work then it is the LPT parallel port that needs replacing.
If Z axis still does not work but X axis does then it is your driver card that needs replacing.

Tweakie.
KEEP SAFE !

Offline TPS

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Re: Low voltage on stepper port issues
« Reply #16 on: March 25, 2018, 04:55:19 AM »
not realy,

because for example pin 6/7 will stll be connected to the same optocouples of the board (physicaly).

to do this test you have to swap Pins at the 25pol. Sub D (LPT Card or board side does not matter).
anything is possible, just try to do it.
if you find some mistakes, in my bad bavarian english,they are yours.

Offline Tweakie.CNC

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Re: Low voltage on stepper port issues
« Reply #17 on: March 25, 2018, 05:15:22 AM »
You're right TPS, the physical pin connections have to be changed, please ignore my earlier post.

Tweakie.
KEEP SAFE !
Re: Low voltage on stepper port issues
« Reply #18 on: March 26, 2018, 09:20:54 AM »
Measuring the ports on the PC gives this result.
This is directly at the PC no cables in between.

pin2  4,79v
pin3  4,79v
pin4  4,79v
pin5  4,79v
pin6  3,1v
pin7 -0,249v

pin 2 is step for X
pin 3 is dir for X
pin 4 is step for Y
pin 5 is dir for Y
pin 6 is step for Z
pin 7 is dir for Z
Re: Low voltage on stepper port issues
« Reply #19 on: April 01, 2018, 02:46:22 AM »
Check the pins at the computer first. If OK at the computer, check at the end of the cable.
I just went through the same thing and discovered it was a bad cable.