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PREVENTI VE MAINTE NANCE DESCR IPTIO N OF THE MO NTHL Y MAINTE NANCE SC HEDU LE 33.10 Technical Reference Manual Chapter Issue 6 Oct 06 Accuracy Check For an accuracy check, except wher e stated othe rwise, thirt y test …

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PREVENTIVE MAINTENANCE
DESCRIPTION OF THE MONTHLY MAINTENANCE SCHEDULE
Chapter Issue 6 Oct 06 Technical Reference Manual 33.9
DESCRIPTION OF THE MONTHLY MAINTENANCE SCHEDULE
Introduction Two modules form the basis of the monthly schedule. The process requires that
each month a machine repeatability check is performed on Squeegee Pressure
and the X, Y and Theta axes. This is done using the Statistical Process Control
(SPC) data collection program (where available).
Module 1 The first module comprises the following elements:
• SPC Alignment Check - used to set a benchmark each month, the hard-
ware is checked to give a snapshot of the machine condition, performance
is monitored to predict failure before it has an affect on production.
• Machine Cycle Count - machine usage is logged in the table.
• A Software Check is carried out, if a newer version is available this may
contain known defect fixes or equipment enhancements. The service
engineer can recommend an upgrade for the equipment in service. In
addition, the machine event log is checked to identify any re-occurring
errors which if not inspected/diagnosed may lead to unplanned downtime.
• A standard Monthly Maintenance Check consists of a series of mainte-
nance tasks which are performed every month.
Machine safety checks are carried out on a basis as laid down in the monthly
schedule.
In addition, the engineer performs maintenance on set machine modules,
checks software version and records the cycle count.
Module 2 In this module, over the course of a year, the following assemblies are checked.
• Printhead
• All Electrical Enclosures
• Camera System
• Squeegee Mechanism
• Rising Table
• Paste Dispenser
• ProFlow (if fitted)
• Temperature Control Module (TCM)
• Screen Alignment
• DC Supplies
• Vacuum Filtration Unit
• Pneumatic System
• Safety System
• Rail System
• Print Carriage
• Machine Level
• Screen Change
• Adjustable Screen Mount (ASM)
PREVENTIVE MAINTENANCE
DESCRIPTION OF THE MONTHLY MAINTENANCE SCHEDULE
33.10 Technical Reference Manual Chapter Issue 6 Oct 06
Accuracy Check For an accuracy check, except where stated otherwise, thirty test cycle meas-
urements are set (preceded by ten cycles unmeasured to allow the machine to
settle). Pre and Post print measurements are taken to record the accuracy of
the alignment in CPK values and the front and rear squeegee pressures
displayed in bar units.
SPC Results Where the QC Calc for Windows program is installed and customers have
employed the DEK Equipment Utilization Programme, SPC data capture can
graphically show critical alignment and squeegee pressure accuracy. The
graphs in their visual form are often useful in determining the optimum mainte-
nance plan.
NOTE
DEK Equipment Utilization Programme is available from DEK Customer Sup-
port Group.
Customers may opt to use the collected data in their own management system,
DEK cannot provide support for any programme other than DEK EUP.
Examining the
Collected Data
In addition to examining the SPC data which is displayed graphically in the QC
Calc for Windows program, engineers can extract information about machine
performance from other sources.
The data collected on the machine is stored in ‘event.dat’ and ‘readings.dek’
files, accessible in the following locations, E:\config\readings.dek for SPC
data and E:\config\event.dat for error occurrences. Information can be dis-
played in a text editor and specific data can be examined eg, events between
Visit Pre X Pre Y Pre Theta Post X Post Y Post Theta Front Sqy Rear Sqy
1st 2.00 1.63 1.97 1.84 1.40 1.60 5.15 4.86
2nd 1.89 1.63 1.84 1.80 1.40 1.60 5.00 4.86
3rd 1.86 2.00 1.98 1.48 1.48 1.70 4.98 4.86
4th
100 Cycles
1.84
100 Cycles
1.94
100 Cycles
1.76
100 Cycles
1.63
100 Cycles
1.46
100 Cycles
1.56
100 Cycles
4.50
100 Cycles
4.80
5th
6th
7th
8th
9th
10th
11th
12th
PREVENTIVE MAINTENANCE
DESCRIPTION OF THE MONTHLY MAINTENANCE SCHEDULE
Chapter Issue 6 Oct 06 Technical Reference Manual 33.11
dates or a specific word or phrase.
Each occurrence of an error for example, can be examined to see if the rate at
which it has occurred has increased (is it a random occurrence or an increasing
trend?).
Authorization At the end of each monthly task a Summary/Remarks form is provided to allow
the engineer to make comments or express observations. He must sign off and
date the form so that there is a record that the schedule has been completed.
NOTE
The following pages can be used as a template to create a preventive mainte-
nance schedule. They can be photocopied and stored as a permanent record
of maintenance tasks performed.
readings.dek
event.dat
27/04/2000 14:00:02 40022 Valid Dongle Detected
27/04/2000 14:00:22 41570 Rail Lifted Error
27/04/2000 14:00:14 48273 System Initialised
27/04/2000 14:00:14 48273 System Initialised
DATA X reverse [mm] ,0,0000.0,0000.0,0.414,-0.02234
DATA Y reverse [mm] ,0,0000.0,0000.0,0.521,-0.07776
DATA T reverse [mm] ,1,0000.0,0000.0,2.414,-0.05568
CONFIG CamAx2
CONFIG FACTORAL TTHJXCK
27/04/2000 14:00:30 50001 Machine Recovery Started
27/04/2000 14:00:14 56183 System Power On
27/04/2000 14:00:14 56183 System Power On
27/04/2000 14:00:28 41212 Product Data Changed
27/04/2000 14:00:16 325876 PCIB Ready
27/04/2000 14:00:16 325876 PCIB Ready
27/04/2000 14:00:02 40022 Valid Dongle Detected
27/04/2000 14:00:02 3867 Power Up
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