Epson Stylus Pro 9500 Service Manual page 192

EPSON Stylus Pro 9500
SENSOR ADJUSTMENTS
The P_EDGE, P_REAR and P_FRONT sensors which detect the paper are
reflective type optical sensors, so if the sensors themselves and the main
board are replaced, the following adjustment should be made to set the
sensors' detection level to the proper value.
Adjustment
For the reasons given on the preceding page,
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depending on the base unit's serial code and the
firmware version, the adjustment methods for the
P_FRONT / REAR / EDGE sensors differ, so the
appropriate adjustment should be made.
If the same sensor adjustment as that for a Type 2
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unit is performed for a Type 1 unit, the sensor's
sensitivity will rise too high and it will be easy for it
to be influence by stray light, and it may no longer be
impossible for it to correctly detect EPSON genuine
paper.
If you are turning the VR1, VR2 and VR3 volume
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resistors on the main board to make adjustments,
care should be taken not to touch the other elements
on the board or the frame, etc. It is recommended
that a screwdriver that is not conductive be used for
this adjustment.
It is easy for each sensor to be influenced by stray
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light from the sun or from the room lighting, etc. The
P-FRONT sensor in particular is easily influenced by
stray light, so printing should always be done with
the printer covers securely in place.
If the specified paper is set in the printer for each
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sensor adjustment, the paper set lever should be
moved to the paper set position securely so as to
stabilize the paper over the sensors.
The papers used for this adjustment (PPC, Kimoto
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Tracing Paper #300) should be replaced periodically.
If there is any dirt (ink, foreign matter adhering),
damage (wrinkles, tearing) in the standard paper, an
accurate adjustment cannot be made, so the
standard paper should be replaced after adjustment
of about 20 printer units.
Adjustment Steps
Revision A
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