SOURCE: EPSON DFX 9000 DISPLAYING ERROR O F
This error occurs when the Home Position (HP) of the Automatic Paper Thickness Control (APTC) mechanism is not detected.
This error is caused by a malfunction of either the APTC HP sensor circuit, the APTC motor, or the driver circuit on the ROM Board.
Check the following in the order below, testing functionality at each step. If the APTC motor has malfunctioned, be sure to check the motor driver circuit on the ROM Board before replacing the motor.
1. Check connectors CNSEN1 and CNSEN2 on the ROM BOARD.
2. Check and replace the APTC HP UNIT
3. Check both the APTC motor, APTC UNIT, ROM BOARD, and replace either or both as necessary.
Get a service manual HERE if you need it.
SOURCE: error 07 ,turn off Printer on dfx 9000
Timing fence could be faulty or dusty. Clean it and test if that fails replace it.
SOURCE: error 04 dfx-9000
Well, first things first, you should go into the control panel, open hardware, then device manager, highlight "printer" and then scan for hardware changes, if no recent changes were made, you should check if there was any "Driver updates and changes" and see when the last change/s were done. If it's not a updated driver, then it's probably a recently update to the program. if neither are relevant you can "roll back the driver". Word of warning, although it may solve the issue, it can also make things worse. Be sure to make a restore point before you start this (System Restore). Make sure it's turned on before you start any changes. If it's turned off, activate it and select "make/create a restore point" just in case. If it's already on, pick the oldest restore point you have and use it, that often fixes things. You can also try uninstalling the printer program and re-installing it, that can work also. If none suggestions work you could go through the instruction manual and see if they have any suggestions. I've included a link to the it for you. Just copy and paste into the address bar. Hope this helps. Grim
https://files.support.epson.com/pdf/dfx9k_/dfx9k_ug.pdf
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