I was using my board 3 weeks ago. When I came back today to use it the LED for the 12VDC power wouldn’t turn on. The voltages across the relays when triggered are twelve volts still but I do not hear a click that it has engaged and the motor it is attached to doesn’t turn on. I cannot get it to connect through USB anymore either.
Suggestions?
Sounds like a power supply problem. Does the manual function still work?
The buttons trigger the LEDs for each relay but I do not hear them click like they used to when it worked.
You need to check the output of the power supply
When checking it the power supply is putting out 12VDC. Upon inspection of the board after this, the circuitry beyond the Rectifier has no voltage drop across the resistor and LED.
One should think of a broken track on the pcb?
Can you post some Clear and Sharp pictures (top and bottom) on a free web server and post the link up here?
Maybe some can spot the problem.
docs.google.com/file/d/0B-gSNQ7 … 1zT1U/edit
docs.google.com/file/d/0B-gSNQ7 … xmODA/edit
docs.google.com/file/d/0B-gSNQ7 … hnT2s/edit
docs.google.com/file/d/0B-gSNQ7 … E4UjQ/edit
Hope these help you with locating it.
It seems google is having issues.
Everytime I try to open the link it throws up an error.
It would be better if you could post them where everyone could see them.
Try these.
docs.google.com/file/d/0B-gSNQ7 … E4UjQ/edit
docs.google.com/file/d/0B-gSNQ7 … 1zT1U/edit
docs.google.com/file/d/0B-gSNQ7 … hnT2s/edit
docs.google.com/file/d/0B-gSNQ7 … xmODA/edit
Those do not work either.
It maybe me or my machine.
You might want to find another site
Topic starter forgot to set up the pictures as public for anyone? Seems only people with a Google account can see them.
I tried.
Obviously Google says that you don’t need to log in to see them but that must be a lie. I don’t have any other way to put them up unless there is a place I don’t have to have an account to do that.
You can set them as a public album.
They are set as public which is why I am confused…
So we have been able to diagnose that the problem lies between the terminal block where the 12VDC comes in and the full-wave bridge rectifier. By bypassing those 4 diodes we are able to get the board working. By analyzing the diagram we were not able to see a way to bypass the diodes and still use the terminal block for DC. Is this just an issue with the design or something within our board?
Steven
If you want to feed DC to the board, just remove the diodes and replace two of them by wire jumpers (e.g. D14 for the minus and D11 for the plus), see diagram.
Please note that you loose polarity protection, so make sure you apply the correct polarity.