Maintenance (Micron) workbook Iss07.pdf - 第58页

58 Issue 6, Nov 14 Objective SC14: Calibrate squeegee heights Calculates the distance in millimetres from the squeegee hom e position to the top of the rail for each squeegee. It then calculates the steps/kilogram pressu…

Issue 6, Nov 14

Objective SC12: Calibrate vision Scale

Carried out in maintenance function - calculates a scaling factor (pixels/mm), the centre of

rotation of the stencil and fiducial capture accuracy for use by the vision system during

alignment.

NOTES:

Objective SC13: Calibrate vision offset

Carried out in maintenance function - calculates the camera offset for use during

alignment.

NOTES:

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