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Service tests
Photocells
This machine uses so-called intelligent photocells. The currents of the photocell transmitters are adjusted in such
a way that the no-paper output voltage of the photocell receiver is within a certain voltage range of the photocell
receiver.
In this way, a reasonable amount of dust on the photocell sensors can be compensated for. The control mechanism
ensures that very reliable “paper” and “no paper” decisions are being made, based on the paper photocell condition.
The screens provide real-time information on the various paper photocells. You also can see if the relevant photocell
“sees” paper.
Press the Cal. button to adjust the photocells.
Before readjusting the photocells it is strongly recommended to remove all paper from the
machines and to clean all the sensors (both transmitter and receiver!) of the photocells.
After the photocell have been adjusted, the percentages in the screens should be lower (if the cleaning advice was
followed).
If no paper is present, the photocell output voltage should have a value between 0.8 V and 1.5 V. A value below
this voltage range indicates that the photocell is too dirty. A value above this voltage range may occur if after
readjusting a photocell dust is removed. In both cases, the photocells must be adjusted.
If the photocell current percentage is below 75%, the message “OK” is shown. A percentage between 75% and
99% results in a “Clean” message. The photocell should be cleaned before resetting the photocells. The message
“Defect” is shown when the percentage is 99% or 100%
32
4
063.1
Service
Guide
Содержание 6204 Series
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