Avery Dennison 676 - Manual (Page 42)

42 • •• • Adjustments
4) Compare the actual feed length of the sense mark stock being run with the feed
length set in the format.
5) Repeat the sensor alignment procedure.
Feed Open
If the switch is in need of adjustment - first check and adjust, as needed the feed
pressure, as it will affect the switch adjustment. With the machine rear cover
removed while opening and closing the feed pressure knob you should heard the
switch clicking. If not, the switch bale is adjusted by carefully bending it as needed.
Optical Sensor Electrical Calibration
Re calibration times are indicated in the troubleshooting section.
The following guidelines indicate the proper procedure used to calibrate these
sensors.
Note: Clean all optical sensors with clean compressed air or canned air prior to
adjustment as dust and debris will adversely effect their performance.
There are three basic steps to calibrating each optical sensor.
1) Select the sensor to be calibrated in the Calibrate Sensors mode on the front panel.
2) Place media or ink as the case maybe in the appropriate sensor and press the enter
button on the front panel.
3) In the case of stock registration sensing reposition the media so that a hole / slot or
black reflective mark is in the sight path of the appropriate registration sensor and
press the enter button on the front panel. In the case of stacker jam sensor
reposition the media so the media is not in the sight path of the jam sensor and
press the enter button on the front panel.
Print Head
Tangent
Proper print head tangent is perhaps the most important adjustment to make on a
thermal transfer printer. A printhead which is not properly adjusted will result in
poor print quality, poor heat dissipation which can reduce print head life, and
possible ink wrinkling problems. When the machine was manufactured, the print
head was adjusted to the proper tangent point on the platen roller, however, with
print head replacements the tangent point for the new print head may change. It is
therefore necessary to understand when and how to properly adjust the printhead
tangent. Before making any adjustment to any of the three print station tangent
points confirm the following:
- Is the ink and stock loaded in the printer correctly?
- Is the proper ink and stock loaded in the printer for the format downloaded?
- Is the strobe setting(s) on the front panel set according to the ink and stock loaded
in the printer?
- Is the ink and stock of known types?