DIYLILCNC

1. bmyk
   Member

   Hi all,

   I am building the PCB from Hobby CNC and have arrived at the testing step (to assure proper voltage before installing the chips). As one may recall, you have to apply a voltage between 12-42VDC to assure proper readings. To apply this voltage I am using an old wall adapter that is 15VDC @ 1A. When applied, my multimeter reads only .5VDC. I have tripled checked and gone through all the steps and have found no errors in my build thus far. Does the amperage of the wall adapter have anything to do with this problem? Should I be using a battery instead? What did you use to test with?

   Thank you in advance!

   Posted 12 months ago #

2. markm
   Member

   Where are you measuring the voltage? If the0 .5V is the output of the wall wart when connected, look for a short between power and ground. If the 0.5V is the output of the 5V regulator, then look for a cold solder joint, probably at the LM317 regulator.

   Either way, time to get out a magnifying glass and a strong light and check for solder bridges or cold joints.

   Posted 12 months ago #

3. bmyk
   Member

   I am testing by placing the negative lead from the voltmeter on the "-" symbol near where it says 42V and then applying the red lead to the spot that says +5, as directed.

   I did as you suggested to no avail...

   Help! Anyone!

   Posted 12 months ago #

4. Taylor
   Key Master

   @markm,

   Wall warts are notoriously flaky - you'll see that they give different voltages depending on where in your house you plug in. Is there any reason you're not testing with the full-scale transformer that's called for in the build?

   Posted 11 months ago #

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