Avery Dennison SNAP 656 - Manual (Page 48)

42B • •• • Adjustments / Maintenance Users Manual Model 656/636
Print Registration Sensor
Web Position Adjustment
If you are running sense mark media with a hole or slot for registration the
registration sensor web position must be adjusted for the sense mark media being run:
1) Open the feed roller and print head.
2) Move the stock by hand in the feed direction until the registration hold or slot
desired is in the slot on the sensor funnel over the red LED light bar.
3) Close the feed and the print head.
4) Slide the sensor block assembly using the sensor handle while looking at the
sensor LED on the front panel. When the LED turns on with the registration
sensor over the media in the vicinity of the hole / slot, and stays on, the sensor is
over the registration hole or slot.
If your machine stops, for no apparent reason, while it is in the middle of printing a
batch, you may be missing sense marks (three consecutive tickets in a row in which a
sense mark was not found). Check for the following:
- The front panel will display an error message indicating that there has been a
missed sensor.
1) Check that the web guides have been positioned properly - both on the unwind
and decurler.
2) Compare the actual feed length of the sense mark stock being run with the feed
length set in the format.
3) Repeat the sensor alignment procedure.
Rotation Alignment
The optical sensor for the light from the LED bar for stock registration is mounted on
a square shaft directly above the web plate assembly, just prior to the print station.
Although this bar is factory adjusted prior to shipment, it may become necessary to
readjust the bar to assure proper light reception. If after following the previous
procedure the missed sense mark error continues to occur proceed as follows.
1) Remove the stock from the machine.
2) Slide sensor block to its furthest rear travel (away from the operator).
3) Remove the back cover of the machine.
4) While holding the screw that secures the square bar to the machine upright, rotate
the square bar to align the sensor to the slot over the light bar. Retighten the
screw as needed.
NOTE: In order to determine the optimum alignment us the front panel display (refer
to the Sensor Calibration and Front Panel Mode Description sections in this
manual)
5) Slowly slide the receiver block to its furthest forward position (towards the
operator) while confirming that the sensor alignment is maintained throughout its
travel. The change in the front panel should be last than 50.