Lotem laser calibration doubt...

[kala]

We tried to change the 24Lbox into 48 Lbox last week.. we faced problem in laser calibration all the laser failed to calibrate..

1. we changed the burnt daughter board in 48 Lbox apart from that we found one or 2 LDD cards burnt in 48 Lbox we changed that LDD card too afterthat also same status..

earlier we faced the same problem in 24 lbox but when we changed all 0-11 LDD cards the problem was sorted out..

but here in this case we have few doubts..

if any one or laser diode is fails in first or second daughter board whether it affect the calibration of all lasers...

if we put the diode along with card in other position like 23 diode into 24 diode whether it will affect the calibration...

instead of plug out the LDD cards 0-11, 12-23,24-35,36-47 and checking the calibration is it ok when i doing the same thing by editing the registry...

we have changed the registry into 24 into 48 .. even in default laser value too...

the error is as below .. laser calibration failed to reach req power 225.000 mw...

kindly note that earlier everything is working in 24 Lbox .. we changed all the items in 24lbox to 48 lbox.. apart from diodes..

for eg the error readings in laser calibration window is like us below...

0 8 2 186 85
1 8 2 170 85
2 8 2 85 245
3 8 2 186 85
4 8 2 170 85
5 8 2 85 245
6 8 2 186 85
7 8 2 170 85
8 8 2 85 245
9 8 2 186 85
10 8 2 170 85
11 8 2 85 245
...........
......
47 8 2 192 85 likethat..

is there is any other way to find out which LDD card or Diode is a problem...

* Hi Patch / Nimo need ur response as usual...

regards
kala

 

[nemo]

"kindly note that earlier everything is working in 24 Lbox .. we changed all the items in 24lbox to 48 lbox.. apart from diodes.."

Kala, when you started this thread a while ago you stopped replying with updates on the progress. If you find a solution, please post it for others to benefit from it.

If I understand well, you got your original 24 diodes problem fixed, then you tried to upgrade to 48 diodes ??!!??. From your post it is not clear what did you replace. Is it a full 48 diodes kit with complete Lbox and optics or just the boards in the L-box? Do you have a DDB-1-N card in this machine?

If a diode fails it will not affect the others but the software will automatically turn off the rest of the diodes and maintain the widest swath available for imaging. You have to reset the diodes for the machine to try calibrating them all again. In case of LDD failure the software will do the same thing but the bad LDD may take others down with it at a hardware level like it happened in your original problem.

 

[PACH]

Nemo is spot on that it is VERY hard to understand what exactly is going on with your Lotem. Is this the Lotem that yo are trying to install?

"kindly note that earlier everything is working in 24 Lbox .. we changed all the items in 24lbox to 48 lbox.. apart from diodes.."

Kala, when you started this thread a while ago you stopped replying with updates on the progress. If you find a solution, please post it for others to benefit from it.

If I understand well, you got your original 24 diodes problem fixed, then you tried to upgrade to 48 diodes ??!!??. From your post it is not clear what did you replace. Is it a full 48 diodes kit with complete Lbox and optics or just the boards in the L-box? Do you have a DDB-1-N card in this machine?

If a diode fails it will not affect the others but the software will automatically turn off the rest of the diodes and maintain the widest swath available for imaging. You have to reset the diodes for the machine to try calibrating them all again. In case of LDD failure the software will do the same thing but the bad LDD may take others down with it at a hardware level like it happened in your original problem.

 

[kala]

Hi nemo

i updated the status and thanked u ; pls go thro my earlier mail to u and pach stated that 24 diode laser machine problem was sorted out and we started working...

Now in 48 laser diode machine also started working replaced the daughter board and problem in fixed...

thanks for ur reply...

 

[kala]

Patch i faced a problem in Lbox upgrading 24 to 48 ; after changing the daughter board the problem fixed... This is fyi..

 

[PACH]

Kala,
I take my hat of to you for doing the change as it is not a straight forward task. I hope for your own sake that everything will work Ok for you now.

Patch i faced a problem in Lbox upgrading 24 to 48 ; after changing the daughter board the problem fixed... This is fyi..

 

[kala]

Hi Patch / Nemo

after calibration facing problem in the plates full of thin lines from top to bottom...

image doubling + shifted + blurred as like as attached image...

regards
kala

 

[PACH]

Kala,
I presume that you installed the 48 diode L Box + dynamic optics. I think that your best bet is to do an Elevation calibration and after that you might need to do Uniformity test. As I said before that I was amazed you did this upgrade without doing one before but as I have been reading all your posts you have a go at anything.

Hi Patch / Nemo

after calibration facing problem in the plates full of thin lines from top to bottom...

image doubling + shifted + blurred as like as attached image...View attachment 2980

regards
kala

 

[nemo]

The image you attached seems to indicate a data path or software issue - the lines overlap in all colors so it is not a random hardware thing neither a laser setup one.
I have never seen anything similar and I wonder if your diode mapping is correct but the lines seem too far apart to indicate such a problem. Looks like a regular pattern there - what is the exact distance between the lines?
Did you experience the same lines when you ran the calibration tests?

 

[kala]

Hi tried with calibration test same status lines with doubling pls find attached image for reference.. (Kodak logo doubled / lines on calibration strip)

1. As advised by patch whether need to do elevation test or not..

2. earlier its 24laserhead machine now afterchanging the 48Lbox now its 48 laser head; but old regitry is not supporting becaz the old software version 3.2 & new 3.61

3. i tried with my running 48 machine registry but software is not booting and stated the error that punch card version is different how can we change the revision of punch card version C to A in registry ( i searched i couldnt get it done thro registry)..

4. even i swapped some laser diodes position (not LDD board) from 7 to 0 ; and 22 to 1 and made the series 2-44 laser working...

Kindly advise what to do next..

regards
kala

 

[nemo]

Kala - are those lines vertical (around the drum) or horizontal?
The calibration test pictures are blurry but I see some ghosting in there.... this means data problem.
Reseat the TSP cable and check for bent pins. Do you have a spare DDB-1-N card?
Make a backup, uninstall the Lotem application, delete the Lotem registry and reinstall the application clean or just reinstall OS and application.
If diodes are mixed up you will get vertical lines all across the plate but very close to each other - about 1mm apart - will not cause horizontal lines - these are coming from TSP, DDB most probably but may also be caused by the sync signal which I think it's generated in the Ebox (probably Strobe card or NUC but I'm not sure exactly which one)
Your application may not be not starting because of wrong or corrupted values in the registry.

 

[kala]

pls find replies online..

Kala - are those lines vertical (around the drum) or horizontal?

vertical from top to bottom bottom to top not horizontal

The calibration test pictures are blurry but I see some ghosting in there.... this means data problem.

tried firing the job from running machine rip and tsp and tsp cable (we have 2 machines one is running) same result so its not data problem...

Reseat the TSP cable and check for bent pins. Do you have a spare DDB-1-N card?

earlier 24 diodes working fine with image and calibration so hope DDb is also not a problem


Make a backup, uninstall the Lotem application, delete the Lotem registry and reinstall the application clean or just reinstall OS and application.

reloaded software.. no issue's same status


If diodes are mixed up you will get vertical lines all across the plate but very close to each other - about 1mm apart - will not cause horizontal lines - these are coming from
still expecting diode side is the problem becaz i swapped few laser diodes order for eg 7th laser in 1 position and 12 laser into 2nd position...but all are calibration even though at >350mw values lines again its very close and vertical lines no horizontal as i said earlier..

TSP, DDB most probably but may also be caused by the sync signal which I think it's generated in the Ebox (probably Strobe card or NUC but not sure)

everything works fine in 24laser earlier so iam not sure whether NUc or strobe is the cause.. thinking and doing arrangement for elevation test as advised by patch..

Your application may not be not starting because of wrong or corrupted values in the registry.
No software issues...

anyother suggestions pls..

regards
kala

 

[nemo]

Here are some things to consider:
If the lines are caused by misfiring diodes the distance between lines should be around 1.2mm for 48 diodes and ~0.6mm for 24 diodes..
The software will not start if you have wrong values for the diodes in the registry (you will get C++ or some .dll errors at application start)

I would start by using the 48 diodes configuration with clean install of application.
If you want to use diodes 0-23 only adjust first and last "EXPOSE laser active" - do not touch first and last "laser active"
Run some test with with only the first or last set of 24 diodes and see if problem is on both or only one set - then follow the same logic you used to identify the bad LDD board earlier to figure out if and which diodes are swapped or not turning on.
If results are bad with any set of diodes, try physically disconnecting the corresponding LDD's to avoid them to be activated.
However, this would only explain the lines on your plates and I think there's more to it - mixed up diodes will not cause any kind of image ghosting on this scale.
The large ghosting makes me think that your DDB is causing this - try replacing it.

 

[kala]

Hi Patch /Nemo

Do u have lotem controller software 3.20.01...

Is it possible to upload it..

regards
kala

 

[nemo]

PM me as I will need details