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Is there any acivity on the control panel when you power on the printer, any LED lit, LCD display? If not, this maybe just a bad connection between the mainboard and the control panel. Make sure the flex cable is correctly inserted on both ends, also check the power switch on the control panel.

You could never go wrong getting genuine Mutoh parts from authorised Mutoh dealers

In my opinion, new ink is much better than the bio-ink. If your VJ-1608 uses heated air, you should be fine to switch to this ink. If you have the one without heated air, you may have a problem because it is not as quick drying as the original bio-ink.

Possibly contaminated pressure rollers or the material is sensitive to pressure so when printed on, the area under the feed rollers react differently to the ink than the area where no pressure was applied.

Yes, you can update the ink flag in the parameter menu so it will not do an ink fill. The printer should be OK to print after this. To obtain optimum print quality, you should input the headrank of the installed printhead and perform uni and bi-di adjustments.

If the smart chips and the chip readers are OK, you should get a low ink warrning error long before the cartridge's ink out tab sticks out to trigger the end of ink sensor.

To get MEA or MSA working in Windows 7, temporarily disable Windows Firewall. To be able to upload parameter file, you need to input the printer's serial number into the new mainboard.

Switch 2 on mainboard must be set to on while doing the firmware upgrade

Mutoh service manuals do not have schematic diagrams.

This problem is usually an issue with the profile, use the correct one or have one custom made for the media you are using.

Very easy, just make sure the rubber O-rings are correctly positioned.

You need to install the mainboard and sub-controller firmware. You will need a program like Mutoh Maintenace Engineer (MEA) or Mutoh Service Assistance (MSA) to be able to do this. The mainboard has a default IP Address for this. It will also be good if you have extracted the parameter file from...

I assume you are talking about the head rank parameters. The head rank is written on a label stuck on the printhead, you input this on the parameter update menu of the Self Diagnosis Mode.

For Valuejet printers, you will need either the Mutoh Maintenance Engineer Assistant (MEA) or the Mutoh Service Assistance (MSA) program

Ruptured or disconnected ink tube on ink pump???

To stop your printer from sensing the media after each print job, set slant check to off. Do this and see what happens

Magenta nozzles dropping out after a while: ink starvation, possibly blocked filter on damper or air leak, replace damper. Magenta nozzles intermittently firing all the time: most likely an electronic issue, check head cables, make sure they are correctly inserted. Missing print on Cyan...

Try a headwash

I also think it is 0393, been a long time since I worked on one of those printers. I will dig up my old notes to confirm that.

If all printhead nozzles are printing as they should and there is no ink cross contamination, your problem is most likely the profile.