This guide explains pressure faults in your CM750, what causes them, and how to fix them by checking filters, restrictors, and fluid paths.
What pressure faults mean
CIJ printers like the CM750 rely on precise internal pressures to form stable ink streams. Too high or too low, and you’ll see error messages and bad prints—or no prints at all.
Common causes of pressure faults
| Fault Type | Likely Cause | Fix |
|---|---|---|
| Pressure too high | Blocked restrictor or nozzle filter | Clean or replace filter |
| Pressure too low | Air in ink line, empty tank, pump failure | Re-prime system and inspect pump |
| Fluctuating pressure | Viscosity issues or pump cycling | Check VMS and solvent levels |
What to check first
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Ink & solvent levels — refill if low
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Nozzle & restrictor — clean or replace if clogged
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Filters — verify they’re not overdue for replacement
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Ink pump — confirm it activates and maintains steady pressure
How to fix
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Run Fill Mixer to re-prime the system
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Replace any blocked filters or damaged restrictors
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Run Viscosity Monitoring to adjust solvent mix
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If the pump doesn’t respond, inspect power or call support