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Old 12-14-2016, 02:45 AM #1
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Default CTL-DCM needs repair?

Got one of these on ebay for $125+$25sh.

It looks like to me that the red and green lasers that make up the yellow beam are not aiming and creating a red/green beam. Also, seeing videos of the unit on youtube, I think that perhaps the lenses aren't lining up with each other like intended to form their patterns.

Is there a way for me to easily open the case and work on the mirrors' and lasers' adjustment?

Thanks for any help!
Happy holidays!

- Noah


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Old 12-14-2016, 03:40 AM #2
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Default Re: CTL-DCM needs repair?

They're usually epoxied in place at that price point. You can break the epoxy and realign and re-glue the dichroic mirror to perfect alignment, but it may take practice. You may want to consider installing an adjustable mount to make the alignment process easier.
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Old 12-14-2016, 03:42 AM #3
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Default Re: CTL-DCM needs repair?

Do you have a link to the product? Pictures showing the issue you're having? This information will help troubleshoot the issue.

Cyps post is probably accurate, but I'd like to double check.

Thanks!
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Last edited by diachi; 12-14-2016 at 03:45 AM.
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Old 12-14-2016, 05:06 AM #4
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Default Re: CTL-DCM needs repair?

Here is the ad - RGYV 4 Lens 360mW DMX DJ Laser Stage Light Club Party Lighting projector Show | eBay

The issue is that the yellow beam looks like a green and red right next to each other.

I tried opening up the case just now and the red diode is at fault I'm pretty sure. The other beams hit their reflecting mirror in the middle. The secondary red one strikes off center above the green. There are two screws that allow me to alter the diode's placement. I got it to move closer to the middle, but still not quite merging with green before the mirror.
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Old 12-14-2016, 05:28 AM #5
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Default Re: CTL-DCM needs repair?

Yes, the alignment is out. As is common with these cheap units, even when new. Thanks, just wanted to confirm. Cyp was correct, at least partially.

You are correct - the green and red beams need to be right on top of eachother where they meet on the combining (dichroic) mirror. The mirror is then adjusted so that the beams line up in the far field.

This video may be helpful: https://www.youtube.com/watch?v=EU-v5tiS23A
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405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



Check out my Reddit Subreddit! >>/r/laserpointers<<


Last edited by diachi; 12-14-2016 at 05:29 AM.
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