# Laser output on SLB

**URL:** <https://forum.sienci.com/t/laser-output-on-slb/26219>\
**Category:** 📛 Others\
**Created:** [April 20, 2026, 8:33pm UTC](https://forum.sienci.com/t/laser-output-on-slb/26219 "2026-04-20T20:33:18Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Cjohn31875](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/a6a055/32.png) [@Cjohn31875](https://forum.sienci.com/u/Cjohn31875)\
**Post date:** [April 20, 2026, 8:33pm UTC](https://forum.sienci.com/t/laser-output-on-slb/26219/1 "2026-04-20T20:33:19Z")

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Laser output of the SLB is always 4.8vdc, unless SLB is turned off then of course = 0. I think I changed every eprom setting, adjusted laser power slider, turned off laser control, it doesn’t matter laser output = 4.8

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**Author:** ![gwilki](https://forum.sienci.com/user_avatar/forum.sienci.com/gwilki/32/366_2.png) [@gwilki](https://forum.sienci.com/u/gwilki)\
**Post date:** [April 20, 2026, 9:09pm UTC](https://forum.sienci.com/t/laser-output-on-slb/26219/2 "2026-04-20T21:09:04Z")

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@Cjohn31875 Welcome back, Craig.

Is this an new issue? That is, has everything been working properly before now? If so, what has changed since it last worked?

What is your $743 setting?

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**Author:** ![Cjohn31875](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/a6a055/32.png) [@Cjohn31875](https://forum.sienci.com/u/Cjohn31875)\
**Post date:** [April 20, 2026, 10:12pm UTC](https://forum.sienci.com/t/laser-output-on-slb/26219/3 "2026-04-20T22:12:58Z")

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I’ve had the SLB for over a year and works great for cc’ing. Ive only recently tried to hook up the laser. The 743 I’ve tried setting @ 1.2.3 and 4. Still output is4.8 vdc

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**Author:** ![gwilki](https://forum.sienci.com/user_avatar/forum.sienci.com/gwilki/32/366_2.png) [@gwilki](https://forum.sienci.com/u/gwilki)\
**Post date:** [April 20, 2026, 10:55pm UTC](https://forum.sienci.com/t/laser-output-on-slb/26219/4 "2026-04-20T22:55:33Z")

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@Cjohn31875 $730=1000 and $731=0?? Have you tried setting $743 to 0?

Also, how are you measuring the power output?

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**Author:** ![Cjohn31875](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/a6a055/32.png) [@Cjohn31875](https://forum.sienci.com/u/Cjohn31875)\
**Post date:** [April 21, 2026, 7:30pm UTC](https://forum.sienci.com/t/laser-output-on-slb/26219/5 "2026-04-21T19:30:57Z")

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I am away from machine till Monday. I will check $730 and $731 then. I did try $743=0 no avail.

I connected multimeter to the laser output on the SLB side PWM and GRD.

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**Author:** ![Cjohn31875](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/a6a055/32.png) [@Cjohn31875](https://forum.sienci.com/u/Cjohn31875)\
**Post date:** [April 28, 2026, 3:00pm UTC](https://forum.sienci.com/t/laser-output-on-slb/26219/6 "2026-04-28T15:00:34Z")

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Verified the following:

$32=`1

$395=0

$511=7

$730=1000

$731=0

Output laser 4.89VDC Laser slider @0%