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LEF blurred printing

Posted: Wed Jan 31, 2018 2:50 pm
by casementsigns
Hi, I picked up a 2nd user LEF-12 recently. All seems great, test print perfect etc, except sometimes within the first inch of printing there will be some horizontal mis-alignment (as shown). Any ideas? Thanks.
IMG_6175.jpg

Re: LEF blurred printing

Posted: Wed Jan 31, 2018 4:17 pm
by mrtn
Please post test print.

Sample orientation?

Re: LEF blurred printing

Posted: Wed Jan 31, 2018 5:33 pm
by Joe Wigzell
Did the media move?

Re: LEF blurred printing

Posted: Fri Feb 02, 2018 12:46 pm
by casementsigns
thanks for the replies. I'll do a test print & upload it today. The picture was taken with the print bed, so the top of the writing is towards the front of the machine.

It's possible the media moved, it was taped down but only lightly. Would that produce this kind of print defect? However, it happened again on a subsequent print onto card, which was taped down pretty firmly & I don't think would've moved.

Re: LEF blurred printing

Posted: Fri Feb 02, 2018 1:58 pm
by mrtn
To test this you need to fix a media to the table, set the height manually half a millimetre down from the media sensor (not automatically) print a, let's say, a 100 x 100 mm square (just outline) and seeing this appearing measure the square and post here.

Re: LEF blurred printing

Posted: Mon Feb 05, 2018 5:42 pm
by casementsigns
IMG_6192.JPG
ok, here is the test print as suggested! This is on 5mm foam, securely fixed with a Roland adhesive sheet. The x-distance is 100mm as expected, the y-distance is a bit short, about 99.25mm. Does this tell us anything? Also the test print pattern shows a fair bit of drop out now (which wasn't there when I first did a test print on the machine!) which repeated manual/medium cleaning hasn't cleared up... any ideas? thanks.

Re: LEF blurred printing

Posted: Tue Feb 06, 2018 7:36 pm
by casementsigns
it looks like the size of the stepped/blurred print area is the same as the distance the total print is undersized by... is it possible the table is snagging somehow at this point as it moves from the front to the back of the machine? If so, how would I check/correct? clean belts, cogs, etc, look for a broken tooth or similar?

Re: LEF blurred printing

Posted: Tue Feb 06, 2018 7:48 pm
by mrtn
What I would do:

Print a full width 100% CMYK blocks. I mean full width of the table split in four, let’s say 100x100 mm squares in one row printed with Sign & Display colour management setting to rule out print head problems before moving forward.

There may be a print head slow to start.

Re: LEF blurred printing

Posted: Tue Feb 06, 2018 8:22 pm
by casementsigns
IMG_6197 (1).JPG
I did the CMYK blocks earlier as I read that suggestion from you on another thread, that test comes out perfectly.

I have had a quick look at the belt & double gear, belt looks fine, double gear looks like it's missing a couple of teeth though, I can't imagine it's meant to be like this? Feels slightly notchy when you rotate it to that point too.

EDIT: yes, that was it. I noticed that the drive mechanism was the same as the EGX-20, which I have sitting on the shelf not doing much, and he was happy to donate his intact gear to the LEF. Perfect printing, with the 100mm square now measuring 100mm! Many thanks for your ideas & help :)

Re: LEF blurred printing

Posted: Wed Feb 07, 2018 1:46 pm
by mrtn
Oh wow. Has someone ran into the table head first?