Support > LaserShark Support
Galvos no movement need help
zhang:
Hi Nelson,
Thanks for your reply! ;)
There are no more stacks of the same galvo kit we bought at first and we are worried about that if the board doesn't match the mirrors, so we replace them including the mirrors, but it seems no change.
And the noise is from the amplifier but hard to tell exactly which part on the board.
And the voltage I just measured is the output-pins on lasershark-board, wanting to confirm that whether the output from lasershark-board works well or not.
Here is the video(sound may not record):
https://drive.google.com/file/d/1rAAdLj_q-UDPRZy9PQWOFbXaRj1sTkjG/view?usp=sharing
And I found that the LED will turn off automatically after a period of time(about 20s？) if I do nothing, just like the situation as I post here at Jan 09.
Macpod:
Hello Zhang,
Ok, so you have replaced the galvos themselves as well as the galvo amplifiers.
When circlemaker is running the voltages quickly swing one direction and then the other. You would not be able to measure the Lasershark X and Y channel voltages with a voltmeter, you would need to use an oscilloscope. Measuring with a voltmeter would just show a a varying voltage.
I do not hear a switching/clicking noise in the video.
I do hear a "fluttering" noise which sounds like the galvos rotating back and fourth as expected. The galvos do not move a significant amount so it is best to test with a low power laser (i.e. a laser pointer) to identify if the galvos are moving.
If you were unaware the galvos do not rotate 360 degrees when running. Instead they turn clockwise/counterclockwise by a small degree (30-45 degrees max usually) very quickly like the needle of an analog voltmeter.
zhang:
Hello Nelson:
Sorry for delaying so long for returning to China.
The fluttering noise may be the sound of fans attached on laser.
Situations of now:
1. When we only plug in the power supply of the galvos kit, the mirrors will rotate in small angle for unknown reasons. And after 2mins, one of the two LEDs will turn off automatically with a big "click" sound, meanwhile, the mirrors stop movement.
video1
2. The time when I run the demo of circle_maker or the Openlase samples through the Jack, the laser will turn on or off perfectly but the galvos mirrors will be down immediately.
video2
Or maybe it is the galvo kits' problem (new ones are almost same galvo kit as before)? :(
Macpod:
Hello Zang,
For video1, it looks like you have everything connected but you are not running the lasershark_stdin app? I am assuming this because it looks like all wires are connected in the video and I see green power led and green usb led of the lasershark are on.
If everything were functioning correctly the lasershark would print a continuous signal in this state. The fact the galvos are moving is a problem.
In video2 it looks like the power LEDs on the galvo amplifier board are pulsing. Is this a camera artifact or is this really happening? This shouldn't happen nor should they be turning off. The click sounds like the laser mirror is quickly rotating to the absolute max point (which is not something you wan't to have happen.)
Either there is still an issue with the galvo and amplifiers, the wiring is incorrect, or the amplifiers/dac have been damaged on the lasershark. It is a new galvo kit so the galvo and amplifiers shouldn't be damaged yet.. from before it looks like you have the galvo x and y channels wired correctly. Can you validate with the seller the orientation of the ribbon cable?
zhang:
Actually, we received the first reply from the seller and described what problem we met, but it seems to take a little time before the next reply. Hoping to get some hint :P
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