MAKO46 Imaging issue

[Ritchiec]

Good morning

Hope you are well. I kindly ask for some technical advice on a MAKO 46.


Equipment: MAKO46 (High Speed Spinner motor) connected via Pelbox, adaptec AVA2906 to Navigator 9.01 on Windows XP

The machine worked fine for long time in this configuration. An issue arose where the image is stepped smaller in film travelling direction. (ie job at start is correct width, then progressively gets narrower towards rear end. Sharp clear changes in size visible). See picture A


After some basic checks, reseating cables, re-installing the drivers for the Adaptec board no favourable changes were noted. After an hour or two the image disappeared completely and result was lines across the film like picture B & C. They are not sharp lines.
I exchanged the board SCSI Pelbox board with another and problem was the same.
Communication between PC and MAKO46 appears fine all instructions are obeyed from RIP, no errors occur.
Voltage on TP5 is +6v which suggests laser diode is fine.
Voltages on PSU are fine +5v 24v 15v
Spinner motor sounds smooth at speed (I can’t tell if its running at 32k rpm though).
On Board test patterns show same random lines. (I guess this eliminates RIP)

I suspect either spinner assembly or Main Controller board. Any other suggestions or recommendations?


Regards Colin

 

[maxon]

Garbage in video also coming up in test patterns points to the main controller board or laser driver PCB. Check coax cables. Is this ambient temperature related or permanent. PM me for more details, I can help further.

Can't rule out the spinner though, as it appears it shifted the image just before breaking down scanlines completely.

 

[Ritchiec]

Maxon

All results have been permanent, irrespective of temperature.
I initially thought a spinner motor, when I had an image. Now I thought something else.
I was starting to think that the laser data is not been processed properly or in a timely manner.

It would seem that there are too many things to potentially replace. Best I throw it in the harbour.
Trying to acquire any boards is almost impossible here.

Thanks for replying.
Regards Colin

 

[techno]

Picture A looks like it may be spinner motor encoder, cleaning the encoder should solve the problem. But has something else gone wrong to produce the results in pictures B and C

 

[Ritchiec]

Picture A looks like it may be spinner motor encoder, cleaning the encoder should solve the problem. But has something else gone wrong to produce the results in pictures B and C

Thank you for your reply. Am thinking main board is a good place to start.

 

[maxon]

Colin I've sent you a message