Author Topic: Laser turns on when going into and out of laser control window  (Read 525 times)

wveagle81

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Laser turns on when going into and out of laser control window
« on: October 04, 2018, 11:10:21 AM »

I'm not sure how to look and see if someone has asked this before (what search terms to use),
so I'll ask it again.

What happens to me is this.  When I load a picture and then go into the laser control window,
the laser will turn on for a couple of seconds.  When I exit the laser control window, it does it
again.

Most of the time I remember to put the laser into low power mode with the switch on
top of the laser module, but sometimes I forget.  Fortunately I haven't forgotten to do it on
a production piece.

However, if there's a setting I've missed which will keep the laser from turning on when I
change windows, please let me know.  Thanks.

I'm using T2, an EleksMaker A3 Pro, and the 1.1 firmware.
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- Paint Shop Pro and T2
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ggallant571

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Re: Laser turns on when going into and out of laser control window
« Reply #1 on: October 04, 2018, 11:14:18 AM »
Did you install a pull-down resistor on the PWM line? Not sure if it solves your problem but keeps the laser from firing when the CPU is in reset.
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Zax

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Re: Laser turns on when going into and out of laser control window
« Reply #2 on: October 04, 2018, 11:40:33 AM »
That's a very common problem on some Eleks laser modules. It is due to a design flaw with the laser, where it's TTL input is missing a pull down resistor (this is necessary so the laser is fail safe).

wveagle81

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Re: Laser turns on when going into and out of laser control window
« Reply #3 on: October 04, 2018, 11:42:59 AM »
Did you install a pull-down resistor on the PWM line? Not sure if it solves your problem but keeps the laser from firing when the CPU is in reset.

No idea how to do that.  I have a soldering iron and various electrical repair items but I'm
not sure... are there pictures/instructions I can follow?  This is a pretty new laser setup so
if this is a known issue I'm kind of surprised it wasn't taken care of by the manufacturer.
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Zax

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Re: Laser turns on when going into and out of laser control window
« Reply #4 on: October 04, 2018, 11:51:55 AM »
Yes there are pictures and details, I may have posted here but if not you can find them on the Eleks site.

You don't even need a soldering iron (although it would make a better job of it), you can push a 1kohm resistor in the connector between the S-pin and - pin (these are the TTL signal and ground).

You really shouldn't be surprised when it comes to small Chinese manufacturers. They posted 6 months ago that they were aware of this design issue, basically they say "sorry, we make mistake" and continue to sell them.

Moonie

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Re: Laser turns on when going into and out of laser control window
« Reply #5 on: October 12, 2018, 11:46:53 PM »
Hi,

Sitting with the same problem. I had a look at the eleksmaker site but cannot seem to find it ?! Maybe a link Zax ?

regards

Moonie
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aliraminghe

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Re: Laser turns on when going into and out of laser control window
« Reply #7 on: November 26, 2018, 03:48:24 AM »
Same issue even with the new(?) EleksMana v5.2 board, laser keeps flashing till I open the Laser window

I'm not great at soldering, so what about soldering the resistor bridge between green and yellow cables instead of soldering directly to the board?

p.s. New to T2 but looks great, already engraved from a dxf file

Zax

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Re: Laser turns on when going into and out of laser control window
« Reply #8 on: November 26, 2018, 04:29:27 AM »
You can push the resistor into the plug to test, it should be between the S pin and - pin which are usually yellow and black but I've seen every color combination so I think they are somewhat random.

It can go anywhere that is easy, the cable is fine.

wveagle81

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Re: Laser turns on when going into and out of laser control window
« Reply #9 on: December 30, 2018, 09:21:14 PM »

Anyone have any resistors to sell?  We used to have a great store near me which sold
all kinds of electronics parts, but they went out of business.

I have to Eleksmaker A3 Pro setups I need to mod.

Thanks.
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- Paint Shop Pro and T2
- Obstacle Racer and Trail Runner


ggallant571

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Re: Laser turns on when going into and out of laser control window
« Reply #11 on: December 31, 2018, 05:55:05 AM »
Post an address via email and I will send a few.
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wveagle81

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Re: Laser turns on when going into and out of laser control window
« Reply #12 on: December 31, 2018, 06:23:09 AM »
Post an address via email and I will send a few.

PM sent.  Thanks!
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