Maintenance (Micron) workbook Iss07.pdf - 第59页

Issue 6, Nov 14 59 Objective SC15: Identify machine related causes of print defects It is important that the Technician understands which areas under their control can have a direct influence over the print quality and h…

58 Issue 6, Nov 14

Objective SC14: Calibrate squeegee heights

Calculates the distance in millimetres from the squeegee home position to the top of the

rail for each squeegee. It then calculates the steps/kilogram pressure factor.

NOTES:

Issue 6, Nov 14

Objective SC15: Identify machine related causes of print defects

It is important that the Technician understands which areas under their control can have a

direct influence over the print quality and how to identify a defect and quickly rectify the

problem.

The Perfect Solder Print Causes

Machine critical assemblies flat and level

Critical machine settings within tolerance

Machine calibrated

Machine clean and well maintained

Shown below are some common solder print defects. Suggest some machine related

causes of these defects

Bridging Incomplete

Misalignment Excess Print height

Causes of defects

60 Issue 6, Nov 14

Module M-PM

Preventive Maintenance