How to Replace CIJ Pump, Filter and Nozzle
Regular maintenance and timely replacement of the pump, filters, and nozzle are crucial to ensure consistent performance in Continuous Inkjet (CIJ) printers. This guide provides a clear, step-by-step procedure for replacing these components safely and efficiently.
Before You Begin
- ✅ Power off the printer and disconnect from mains
- ✅ Wear protective gloves and use solvent-safe tools
- ✅ Work in a ventilated, clean, and static-free environment
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1. Replacing the CIJ Pump
Function:
The pump controls ink circulation and pressure. A failing pump leads to weak ink streams or ink flow errors.
Steps:
- Open the fluid module compartment
- Locate and label ink inlet and outlet tubes
- Clamp tubing to prevent ink spill
- Remove tubing from the old pump
- Disconnect electrical connector
- Unscrew and remove the old pump
- Install new pump and secure mounting screws
- Reconnect tubes and electrical cable
- Run “Pump Test” from maintenance menu
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2. Replacing the Filters (Ink and Makeup)
Function:
Filters remove contaminants and stabilize ink viscosity. Clogged filters can cause pressure fluctuations or ink starvation.
Steps:
- Identify primary (ink) and secondary (makeup) filters
- Clamp tubes and remove filter fittings
- Dispose used filters according to safety protocols
- Insert new filters in correct flow direction (marked with arrow)
- Reconnect fittings securely to prevent leaks
- Flush ink system as per printer instructions
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3. Replacing the Printhead Nozzle
Function:
The nozzle ejects the ink stream. Over time, it may clog or misfire due to dried ink or wear.
Steps:
- Remove the printhead cover (if any)
- Unscrew or release nozzle retainer
- Carefully detach the nozzle (avoid damaging electrodes)
- Clean the mounting area with solvent wipe
- Install new nozzle and tighten evenly
- Run droplet alignment test to confirm accuracy
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Post-Replacement Checklist
- ✅ Perform nozzle alignment and deflection check
- ✅ Verify ink and makeup levels are stable
- ✅ Monitor pump RPM and pressure readings
- ✅ Check for any leaks or alarms after startup
FAQs
- How often should I replace these components? Pump: every 12–24 months; Filters: every 3–6 months; Nozzle: as needed (typically annually or sooner with heavy use)
- Do I need original parts? Yes—OEM or certified compatible parts are highly recommended for safety and performance
Conclusion
Proper replacement of CIJ printer components extends equipment life and maintains code quality. Always follow safety protocols and consult your model’s manual before performing hardware changes. For technical assistance, parts supply, or preventive maintenance plans, contact Cheef Inkjet at sales@cheef.cn.
