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I think you need to diagnostic printer's smartcard system. And maybe unlock again. I can give you contact of technician who can do it. if you want.

Can you share real nozzle check?

No, it not working on VJ628. You can only upload service code for smart card disable.

MEA Software (MUTOH Maintenance Engineer Assistant) does not supply receiving an *****.mpi or *****.ink file

******.mfl file - it is a heater control firmware file. It is impossible to download this file from printer with MEA

I know this problem very well. It happened because tube in the pump not so clean. So, few drops of ink on tube output and comes to waste tank. These drops made a some minimum vacuum in capping and inks from head goes to waste tank too. This process can continue untill you have the ink in...

New board has a default settings for all user settings and aligmnent. So, you need to make all alignment step by step for perfect print quality.

For run in Diagnostic Mode: Press and hold 3 keys simultaneously [Plus]+[Minus]+[Right Arrow] while power On the printer.

You have to run printer in Diagnostic Mode and go to menu: Parameter->Update->ChargeFlg, and change value to User/Init:Cahrge. And restart the printer.

Serial number needed for MSA. But MEA software can work without serial number. It can be protection of new firmware what you uploaded to mainboard if MEA not working. Same time serial number entry removed from parameters menu in all new Mutoh models. MSA softare has a hidden menu for change...

For change the language of panel: 1. Press [Power] key in the operation panel while pressing [Cancel] key. 2. Press [Setting/value +] key or [Setting/value -] key in the operation panel to modify the value. 3. To save the modified value, press [Enter] key in the operation panel

I think you can try to download parameter via MEA software, change serial number entry in binary *prm file, and upload patched file back to printer.

As you wrote, prameter is available to adjust for printhead. For all printhead, but not for every cannel. You can see space between Cyan and Magenta. These are two channels of one printhead.

Yes, but only one sensor installed on maintenance station. And he looks to window in disk what mounted on pump shaft. Printer can't check if wiper renurned to home position or not. It is optical sensor with thin holes in cover. Ink durs can clogged this holes very easy.

Wiper sensor installed on pump. You can see location on pictures. You need to check cable connection. And clean the sensor.

I think you have a problem with CR Encoder. And need to replace it. Or clean or replace T-Fence. As we can see on picture, the problem is UniDir adjustment. But in this printer you can set adjustment values for whole printhed. Colour on printheads: KY CM MC YK. You can see: KY - no space...

First of all you have to check fuses on mainboard if printhead not firing. Places of two fuses you can find on picture (in yellow squares)

Did you check Steel Belt and CR Speed Reduction Belt tension? How you adjust it? Both values are important.

For install new mainboard you have to run MSA in technician mode and make "Mainboard replace" procedure. One of step of this procedure - register serial number of printer.

I think your CR Encoder is broken. You can make a simple test. Move the carriage to center while printer switched off. Switch on the printer. Carriage should move slowly to home position. In this mode T-fance and encoder will not use. If same error will happen - motor driver on mainboard is...