A deflection fault means your ink droplets aren’t hitting their target path. Here’s how to fix charging, alignment, and stream issues in your CM750.
What a deflection fault means
In Continuous Inkjet (CIJ) printing, charged ink drops are deflected by an electric field to form characters. A deflection fault means drops are missing that deflection path—so they’re not forming readable marks, or they're splattering off-target.
Symptoms
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Fault: Deflection Error or Charge Not Detected
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Faded or missing characters
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No visible deviation in the ink stream
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Frequent EHT/charge faults
Common causes & solutions
| Cause | Fix |
|---|---|
| Weak or failed charge electrode | Clean or replace the charge electrode |
| EHT power supply fault | Test and replace EHT board if voltage is unstable |
| Dirty or unstable ink stream | Run Clean Ink System and check fluid specs |
| Stream not aligned with deflection plates | Realign nozzle and deflector plate spacing |
How to fix a deflection fault
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Clean the printhead, especially the charge electrode and nozzle
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Run a stream test with strobe to confirm drop breakoff
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Inspect EHT board output in
Diagnostics > High Voltage -
Replace restrictor if the stream is wobbling or misdirected
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Reboot and test print in Manual Test Mode
Pro tips for long-term stability
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Replace filters and restrictors on schedule
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Never run the printer with expired fluids
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Keep the printhead clean and protected when not in use
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Ensure printhead alignment is locked in after any repositioning