HELP! Unknown djustments marks...

[Steve Milani]

Hi all Guys!

I would like to make a re-setting of my scanners.
Drivers model is... unknown...
They come from inside my old Laserworld "PRO-400RGY" projector and they should be a prototype of "45kpps" model.


Talking about blue trimmers, I've seen someting alike them on LasershowParts website:
(I repeat: only the trimmers position seem to be the same, remains part of card is little bit different.)
http://lasershowparts.com/store/inde...&productId=178


So I need a little help for to identify, in the right way, what letters written close to each adjustment are meaning for.
I can understand that "LIN" should mean LINEARITY and "G" should mean GAIN..... but remain letters are....unknown to me
I also know that one trimmer between them is... untouchable: very dangerous to try any setting over it! Who of them? B, MOV, V, I, or P?????

Somebody can help me?
I attach a pic of one of my driver cards.

Thanks everybody.
Steve

[shrad]

this is really interesting as I have the same scanners, bought broken but a friend repaired them for me

it seems that one of the two extension modules is broken according to the friend's tests

and also, the table on which you have put your amp is the same as mine :P

so if you gather any information, I'll find them very valuable

[Steve Milani]

Any answer?
Any help?

[buffo]

Hi Steve!

Wow - That sucks that you don't have a manual for those scanners. Unless someone else knows for sure what those pots are for, the only way you'll be able to figure it out is to do some experiments on your own. Be careful to count the number of turns as you experiment, so that you can put the pot back at the exact setting it was at before if you need to.

I'd suggest bringing up the quadrature square wave pattern first. Then test your theory that "G" equals Servo Gain. If it does, then turning the pot clockwise should give you some overshoot on the corners of the squarewave pattern.

Assuming that this is correct, then you need to find the pot that controls low frequency damping. With the gain still turned up enough to give you some overshoot, check the other pots to see which one brings the overshoot back to a dot. That one must be the low frequency damping. (I would think it would be either the P, V, or I pots...) If you picked the wrong one, turn the pot back to where it was and then try another one.

Once you've got the LF damping identified, you need to find the high frequency damping. The easy way to do this is to bring the gain up some more, then add more LF damping. If you do this a couple times, you should start to see some undershoot on the corner. Now you can look for the HF damping pot. Try the remaining ones and see which one will remove the undershoot when you turn it clockwise. That one will be the HF damping.

Once you have gain, LF damping, and HF damping identified, you can tune the amps correctly. (And you'll probably need to re-tune them, since you just increased the speed of one of the scanners by several steps...)

Let us know what you come up with!

Adam

[Steve Milani]

@*Buffo* and *Stanwax*

Thank you very very much Mates!

You and Rob are both very kind guys
Every advice coming from you is always precious to me.

I will do as you two told me, but... before to try any attempt, I wanna try to send a mail to the seller in Germany, hoping that he can give me more infos between this kind of driver cards.

I am not in hurry, so I can spend little time waiting infos I need.

I'll keep you informed.
Thanks alot one more time Guys!
Regards
Steve

[djlorenz]

hey guys... this maybe can help you for more infos...

http://www.laserworld.com/fileadmin/...50K-en_neu.pdf

they are not the exactly modtel but the have the same 7 trimmers for adjusting (and adjusting guide)

[smogthemog]

They are not LW50K's!

Are there any other marks on the boards Steve?

Can we have more photo's ?

[djlorenz]

this galvos are the same of my PRO-300MH, sold for 50k galvos...

[smogthemog]

What I meant was, the .pdf document shows Laserworld LW50K galvo's but Steves galvo's are not Laserworld LW50K galvo's as they are not the same as the ones in the .pdf document - Unless of course they are a new or old design.

I have the LW50K galvo set in my RGB and the driver cards look nothing like the ones Steve has pictured.

Just because the trimmers are of the same amount, colour and look the same dosen't mean they will perform the same purpose on completely different looking driver cards.

[dave]

If I had to hazard a guess, I would say they are laserpic scanners.. Might be worth asking Laserpic.