WILLETT 430, Service Manual

Page: 55 / 207

430 Ink Jet Printer Service and Maintenance Manual
38
Issue 2
Part No. 306-0430-102
4 Set a value of 150. Do not press
enter
.
5 Take print samples, decreasing the charge value in steps of 10 until the print quality becomes poor. It may
be necessary to clean the gutter when poor print quality is produced.
6 Return to a charge value of 150 and increase it in steps of 10 until the print quality becomes poor.
7 Adjust the character height as necessary to prevent over or under deflection.
8 Set the charge value, which gives the best print quality and press
enter
.
Setting EHT Tables for Printing
1 Select Message 1 for printing. Set the Character Height for the currently selected message to 1.
2 From the Calibrate menu select EHT Range Set .
3 Press
enter
.
4 Set EHT Value 1 to 150 .
5 Press
enter
.
6 Reduce the value in steps of 10. Press
enter
after inputting each value and take print samples until the
minimum readable character is achieved (gutter clipping). Set this value.
Note: If gutter clipping occurs, clean the gutter before proceeding.
7 Set the Character Height for the currently selected message to 10.
8 Set EHT Value 10 to 200. Increase the value in steps of 10 and take print samples until the maximum
readable character is achieved. Note this value and decrease it by 10.
Note: It is only necessary to reduce the value by 10 if there is evidence of over deflection. If there is
no evidence of over deflection at the maximum EHT setting of 255, leave the setting at 255.
If over deflection occurs, clean the +ve EHT plate before continuing.
9
After calibration of the EHT table as detailed above, the EHT trip sensitivity must be recalibrated as
instructed in section
Set EHT Trip Level (Normal Operation) on page 39.
Clean Shutdown Check
Stop the jet by pressing
f1
. Ensure that the shutdown procedure operates correctly, i.e. the feed and return
tubes are cleared of ink and solvent.