I have a G540 and Mach3 currently setup with a PCI Parallel port card that I thought had been working well, until I realized I had the Charge Pump "off" on the G540.

After some further testing it appears that either Mach or the Parallel port is not functioning correctly and not generating the necessary pulse for the G540 to pick up.

So, can someone assist me in how to determine what is not working? I see 3 variables here, the G540, parallel port or Mach.. I need to be able to eliminate them but I fear I need a oscilloscope to do so.

Is there another way? I have pretty cool multimeter that is supposed to measure frequency but alas I'm not sure how to use it.. maybe it could be useful?

http://www.amazon.com/Amprobe-37XR-A-Digital-Multimeter-Component/dp/B0012IUYK0/ref=sr_1_1?ie=UTF8&qid=1413158160&sr=8-1&keywords=37xr-a

I'm hoping other have run into similar issues so I'm open to suggestions..

Thanks.

Adam,

No ideas???

The charge pump issue seems to come up a bit mostly due to port related issues or is it a Mach issue?

As a follow up, this is not a Parallel port problem. It's a Mach problem or even a G540 but not a PC problem... anyone know how to test a G540? What about Mach, how do I know its working?

With the G540 charge pump off all is good (Green) with the charge pump on (Red), nothing.

Here are some screenshots of the test I ran with my meter, 12.49khz...

http://youtu.be/_JMpFfcrvKA

A follow up to the follow up... thinking about the problem overnight led to make the realization that the 12.5khz signal should only be present when Mach is loaded and not present when it isn't. So, I re-tested port 16 this morning cycling Mach and sure enough that is the case.

I believe this is a G540 problem..

Adam,