Entirely too dark printout

Assumed cause
  • Image data transfer failure
  • Normal waveform data is not transferred to the Head.
  • Image data generation or transfer failure

Defect-related parts
  1. Head Drive Board
    Discharge to non-discharge part due to noise when switching waveforms, abnormal micro vibration
  2. Main Board
    Image data generation circuit failure
  3. Head Unit
    Discharge failure due to nozzles clogged or malfunction
  4. Head FFC
    Image data transfer failure
Troubleshooting
Step Confirmation and action YES NO
1

Check the connection of the Head FFC
Print the color gradation pattern.

  • Has the image defect been improved?
 Go to step 5 Go to step 2
2

Replace the Head Drive Board
Print the color gradation pattern.

  • Has the image defect been improved?
 Go to step 5 Go to step 3
3

Replace the Main Board
Print the color gradation pattern.

  • Has the image defect been improved?
 Go to step 5 Go to step 4
4

Replace the Head Unit
Print the color gradation pattern.

  • Has the image defect been improved?
 Go to step 5

Replace the parts/components to be checked one by one.
5

Clean the Belt Drawer Unit
Since there is a possibility of erroneous printing on the paper feed belt, clean it according to dirt.

 End of work End of work