DT scanner amp help

[norty303]

Ok, so I've just got round to powering up the first projector tonight to check all connections are good.
I've got DT30's.

When I turn on, I get a single led on each driver (the right hand side one as you look at the front).
However, normally you get a small click a little while later and the galvos snap to centre. I don't get this, the galvos stay loose.
I've tried applying signal but no change.

I can't remember if you get a second led at any point, but I don't.

Can anyone advise where to start checking?

I have a second projector exactly the same, I'll check that next and see if I have the same prblem, that might suggest it's something I've done wrong on both.

[norty303]

Well, I think I found it.

I'm using the 24V PSU to also run the 2 case fans (not yet connected), via a 12V regulator. When I unplug the regulator, both LEDs come on and the galvos centre.
Strange that it doesn't work here, I've done the same thing in my 2 satellites which use DT25's.

[norty303]

Ok, so it looks like I'll be needing to power the fans separately.
What is the easiest way of getting 12v <1A into my projector in the smallest footprint?
Or should I just switch out the fans for 5v ones? I guess I could run these 12v ones slowly at 5v or 6v too.

[badger1666]

a dc-dc converter off the 5v laser supply
or do what i do get a 12 1a wall wort and carefully extract the supply from it, and they are tiny these days

[LaNeK779]

some can be found here (din rail power supplies seem like a good and compact idea) http://gr.mouser.com/Power/Linear-Sw...yzs6qk&FS=True

you could use 24v fans as well (or 5v as you already said)

[norty303]

Given that the DT PSU only gives 0.8A, and the pair of fans will draw 0.4A, and the DT psu is already a bit stretched, I think I'd go for the 5v anyway. I have plenty of spare 5v power.

[LaNeK779]

the only problem with 5v fans is that you can't get any serious cfm blow rates out of them (at least without a ridiculous price and ridiculous dB levels)

maybe reconsider sneaking a 12v din rail power supply in there somewhere? or finding a more robust 24v psu? the added "punch" should also benefit your scanners, me thinks