Overview: Monthly Deep Preventive Maintenance
Monthly maintenance constitutes the deep preventive care layer for die bonding equipment. It focuses on lubrication, accuracy calibration, pneumatic and electrical inspections, and core function verification — all designed to eliminate accuracy drift, component wear, and potential failures caused by long-term operation.
Lubrication and Motion Mechanism Care
Clean the X-Y axis guide rails, lead screws, and handwheel bearings thoroughly to remove accumulated dust and gold wire debris. Apply a small amount of precision instrument-specific grease or lubricating oil to ensure smooth, jam-free movement without abnormal noise. Wipe away any excess grease to prevent contamination of samples and heating stage surfaces.
Z-Axis Height and Bonding Depth Calibration
Re-calibrate the Z-axis zero point using a standard calibration block to ensure consistent pressing depth for every bonding cycle. Verify that the bond head rebound is smooth without sticking, lagging, or downward drift. This prevents chip cracking or cold solder joints caused by height drift over time.
Heating Stage Temperature Accuracy Verification
Measure actual surface temperature with an independent thermometer and compare against the equipment's displayed value. The error must be controlled within ±1°C. Check the heating plate and temperature sensing probe for looseness or aging signs, and calibrate the temperature controller as needed to ensure stable, reliable bonding temperatures.
Pneumatic System Comprehensive Inspection
Verify that the oil-water separator, filter, and air pressure gauge are functioning correctly. Clean pneumatic pipelines and drain accumulated water and oil contaminants to ensure dry, clean air supply. Inspect air tubing for aging, cracks, or leaks — replace immediately if defects are found.
Electrical Connection Tightening and Inspection
Tighten all critical connections including power cord, grounding wire, ultrasonic connection cable, and EFO high-voltage wiring. Inspect for damage, aging, or overheating marks on wires and connectors. Eliminate hidden risks such as poor contact, arcing, and signal drift before they cause intermittent failures.
Ultrasonic System and Bond Head Inspection
Check whether the ultrasonic transducer, capillary holder, and pressing rod are loose. Test that ultrasonic output is uniform and free of abnormal noise. Ensure bond head vibration remains stable to maintain consistent weld spot formation quality.
EFO Ignition System Calibration
Re-calibrate the EFO wand gap, height, and horizontal position. Verify stable operation of the EFO high-voltage module. Perform a free-air ball (FAB) test confirming the gold ball is round, concentric, and free of ball explosion defects.
Vision/Microscope System Deep Care
Wipe eyepiece lenses, objective lenses, and light source lenses with specialized lens cleaning paper only. Check light source brightness uniformity and eliminate reflections or dark corners. Ensure pad observation clarity does not compromise alignment accuracy.
Parameter Backup and System Organization
Back up commonly used process parameters including temperature, power, pressure, and EFO settings. Delete invalid or erroneous debugging parameters to prevent accidental invocation. Consider restoring system default settings to establish a stable equipment operating baseline.
Long-Term Shutdown Maintenance (Idle Over 1 Month)
When equipment will be shut down for extended periods exceeding one month:
- Fully deep-clean all parts of the equipment inside and out.
- Remove gold wire spool, ceramic nozzle, and ignition rod. Store each in sealed, classified containers.
- Re-lubricate all guide rails and cover entire machine with multiple layers of dust-proof covers.
- Power on and run equipment for 30 minutes every 4–6 weeks to prevent moisture buildup and circuit component aging.
