SummaSign Service Manual
FINE TUNING
The Opos system has to be fine tuned when:
the normal calibration didn’t do the job.
the Opos system has been removed from the head.
The markers are extremely glossy (sometimes in cas of photoquality with thermal
wax transfer).
Calibration:
Load vinyl.
Make sure the Opos system is placed perpendicular on the media.
Go to the internal test - system test-optical sensor.
Remove the black piece of vinyl from the Opos sensor.
Turn the left pot meter 15 turns CCW and the 8 turns CW .
Place the sensor top above a piece of white matt media.
Turn the right pot meter CCW until the LCD display shows a value higher than 300.
Then turn CW until the value doesn’t decrease anymore and turn 1/8 of a turn
CCW.
Place the sensor above a glossy piece of black material. Turn the left pot meter
CCW until the display doesn’t increase anymore (more than 8 turns is useless).
This value is usually between 1950 and 2000.
Continue with the normal calibration.
!NOTE!
When the OPOS system still fails to work properly, do the fine tuning on
the media giving trouble. Change the “matt white media” with the
troublesome media and change “glossy black media” with the marker on
the troublesome media.
If everything else fails just try to make the difference, between the readout
above the markers and the readout above the media, more than 800.
The left pot meter changes the gain and the right pot meter changes the
threshold level between black and white.
4-12 Calibration
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