Operation BWP Issue 2.pdf - 第19页

Issue 2, Nov 14 19 Objectiv es BWP 9 – Recov er from common pri nt defect s Reference: Fast track process recovery guide, part no. 158546 Although following the be st working practices will prevent m ost print defects th…

Issue 2, Nov 14

Incomplete Causes

Missing Edge Causes

Misalignment Causes

Excess Print height Causes

Comment [JS16]: Not enough paste in front of

squeegee / in ProFlow

Tooling too high or missing

Paste cold or dry

Stencil blocked

Squeegees / ProFlow damaged

Comment [JS17]: Paste cold or dry (paste knead)

Stencil blocked

Tooling too high or missing

Comment [JS18]: Tooling too high or missing

Wrong stencil (check revision)

Fiducial damage on stencil

Poor board quality / different batch of boards

Comment [JS19]: Tooling missing

Paste temperature incorrect

Damaged squeegees / ProFlow blades

Damaged Stencil

Stencil surface not clean

Issue 2, Nov 14

Objectives BWP 9 – Recover from common print defects

Reference: Fast track process recovery guide, part no. 158546

Although following the best working practices will prevent most print defects there will be

occasions during production when print defects occur.

It is important that the operator 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.

Preparation

 Review the list of common print defects and their causes

Demonstration

Your instructor will simulate a number of print defects on the machine

 For each defect complete the table below. Use the fast track recovery guide to help

identify the cause and remedy

Defect

Cause

Remedy

Issue 2, Nov 14

Objectives OP 10 - Perform routine housekeeping

Reference: Your companies housekeeping procedure if applicable, Machine

Technical Reference Manual

It is extremely important that the DEK printer is kept clean and that any signs of wear and

tear are reported to the maintenance Technician. The Operator has an important role to

play in maintaining the printer in the best possible condition.

Preparation

 Your instructor will demonstrate either your companies housekeeping procedure or

the ASM recommended daily maintenance procedure

Demonstration

 Perform either your companies housekeeping procedure or the DEK recommended

daily maintenance procedure

 Record below the areas to be inspected and cleaned

Areas to be inspected and cleaned: