00198574-01_Process_Foundation_DEK_Micron_EN.pdf - 第58页

8 Troubleshooting and Process Review

8.1 Identify Causes of Print Defects

Process Foundation DEK Micron-Series 12/2017 57

Excessive Paste

Causes:

………………………………………………………

Misalignment

Causes:

………………………………………………………

Best Working Practices

●

Keep reference material near the printer showing good and bad prints

●

Supply troubleshooting guides or flowcharts to aid process recovery

●

Record print failures to aid troubleshooting and fault analysis

●

Have clearly defined escalation procedures

8 Troubleshooting and Process Review

8.2 Determine Causes of Machine Error Messages

58 Process Foundation DEK Micron-Series 12/2017

8.2 Determine Causes of Machine Error Messages

Exercise

For each of the machine error messages shown below, identify the possible product file design

and/ or maintenance causes. Assume that squeegees have been used in these examples.

Note: Depending on the software version the exact wording of these messages may vary

slightly.

Fiducial not Found

………………………………………………………………………………………………………………

Squeegee Pressure Error

………………………………………………………………………………………………………………

Rail Lifted Error

………………………………………………………………………………………………………………

Alignment Close to Limit/ Out of Range

TIP: Refer to the values for X Forward, X rear and Y actuator values in the product file. High

values for these parameters may indicate a stencil or board positioning problem.

………………………………………………………………………………………………………………

Board Detected at Stop

………………………………………………………………………………………………………………

Board Stuck in Rails

………………………………………………………………………………………………………………

8 Troubleshooting and Process Review

8.3 Review a Screen Print Process using the Checklist

Process Foundation DEK Micron-Series 12/2017 59

8.3 Review a Screen Print Process using the Checklist

Introduction

A regular review of the process will identify any problems and ensure that new processes are

maintained following the correct guidelines and with attention to the criterial success factors.

Process Maintenance Checklist

The checklist included in the following pages is split into sections, which cover each of the critical

success factors.

The checklist can be used in two ways:

1. As a reminder of the critical success factors when setting up a new product

2. As a troubleshooting guide if a process is out of control

Exercise

Given a DEK printer with a process already set up, follow the checklist and identify any aspects of

the process maintenance that are not satisfactory.