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It may happens because resonance things. It starts from carriage rail wear, not so good quality or carriage bearings. Small vibrations has a resonance on steel bear, and we cal look it as vertical banding. It may happens because printhead not aligned Also it possible because media overheating...

Try to print Setup variables from printer’s menu. For see will print transparent black if you will not use RIP.

Check the tube to waste bottle. Do you see ink flow while cleaning is in progress?

What printer model would you like to unlock?

Try to reduce ink level in cartridges. For this printer level should be 1/4-1/3. 1/2 is maximum. The printhead in your printer is choked by ink.

What you mean - "refilable ink"? Do you have a picture? VJ1204 does not contained subtatks. So, it very sensetive to ink level in the system. If you use open cartridges you have to think about ink level in cartridges or bottles.

What ink cartridges are you use? Refillable? It looks like ink level too high and inks dripping from nozzle plate. Or dampers not goog quality.

If you upgraded just main firmware without heater board firmware - you lost connection metween main and heater board. This case unlock will not help you. You have to upgrade heater board firmware to version what corresponds to main board firmware. Downgrade of firmwares on Mutoh Valuejet is...

The problem is dirty media sensor. Just open rear media guide and clean the sensor. It installed in "air tube" and may covered ink dust while printing. So, sensor hole taping will not fix it.

Hold on.... File *.bin for update with PC and file for update with flachcard are different. For flashcard you have to use *.pcc file. Another option - update with COM port cable by attached manual for critical situation.

I think you can try to update with PCMCIA flash card. It is hardware option with direct access to plotter's memory.

Check the wire from sensor. It may be you fix it while replacing the maintenance station.

It should be FOC for existing customer.

The printer worked without smartcards. So, card serial serial number did not read by printer. Firmware update is not erase smart cards disable code from the printer.

Maybe your printer was reset to default parameters. Sometime it happens. If smartcards on your printer was disabled by service code, try to upload same code again.

What is IP setting for WiFi on your notebook? If DHCP then please check your IP for WiFi is not in same range as LAN port for direct connection to the printer.

It is maybe too high static on media. And air humidity is too low.

It is not Mutoh format of head rank. Heads from Mutoh has 24 symbols on the rank,

It is not 100% necessary, but extremaly recommended. Prithead will work with wrong head rank but in wrong mode.

Try to remove all cartridges a little and switch ON the printer. If same E9 error will display - you will need install and activate new SIM-card. Sometimes it may happen if you downgrade or change manufacture code of the printer.