Duplo DP-S Series, Service Manual

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42
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Platemaking / Master Feed / Ejection Section
chap.2
Reflection light amount
The larger the reflection light amount is, the
smaller the output voltage is. The smaller the light
amount is, the larger the output voltage is.
The value is checked with the HELP - 008.
* Sensitivity adjustment of the end mark sensor
Make adjustment in the HELP - 008 so that the
sensitivity is 150 or more when reading the end
mark printed on the master and 25 or less in the
master white part.
(Make sure that the master is not slackened.)
HELP-008
\
see p.218
Description
The end marks are located at a fixed distance
relative to the master; as the master is being fed,
the end mark sensor senses master condition and
the end marks by means of intensity of reflected
light.
(2) End Mark Sensor
Circuit
R8S02E08e
End mark
End mark sensor
R8S02025
¡ ¡
A3 : DP-S850/S650/S550
¡ ¡
B4 : DP-S620/S520/S510
End mark
End mark sensor
2
Value of the HELP-008
Black level maximum
White level
5
Black level maximum - 130 or more
255