Minolta EP5000 General, Mechanical/Electrical page 29

Interleaf EP5000/EP4000 GENERAL, MECHANICAL/ELECTRICAL
97.04.01
<Relation with Image Density>
The "Image Exposure" function of "Tech. Rep. Choice" available from the Tech. Rep.
mode enables fine-adjustments of the grid voltage (solid-black image density) to be
made. It specifies how many volts the optimum grid voltage determined by the image
stabilization control is to be increased or decreased. This fine-adjustment value
remains the same even when the optimum grid voltage is later varied by the image
stabilization control.
Controlled Part
Grid voltage output from
High Voltage Unit HV1
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Optimum Exposure Lamp voltage correction
The Exposure Lamp is turned ON to illuminate the halftone patch on the back of
the Original Width Scale, thereby producing a halftone pattern on the surface of the
PC Drum. The Exposure Lamp voltage is then varied so that the output from the
AIDC Sensor falls within the target range, thereby ensuring an optimum exposure
level.
Exposure Lamp voltage
(100V Areas)
Exposure Lamp voltage
(200V Areas)
<Relation with "Manual Exposure Level" of F5>
The "manual exposure level" of Function F5 available from the Tech. Rep. mode
enables fine-adjustments of the Exposure Lamp voltage (halftone image density) to
be made. It specifies how many volts the optimum Exposure Lamp voltage
determined by the image stabilization control is to be increased or decreased. This
fine-adjustment value remains the same even when the optimum Exposure Lamp
voltage is later varied by the image stabilization control.
Controlled Part
Exposure Lamp
Regulator (PWB-J) REM
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AE Sensor gain adjustment
The Exposure Lamp is turned ON to illuminate the blank sheet of paper placed on
the Original Glass (when an F5 or FF operation is run) or the halftone patch on the
back of the Original Width Scale (when the AE Sensor gain is adjusted in a se-
quence other than F5 or FF). The reflected light is then read by the AE Sensor and
a gain adjustment of the AE Sensor is made to maintain an optimum Auto exposure
level.
Controlled Part
AE Sensor Board PWB-H
Control Signal ON
PJ13A-1 Pulse Output
Control Value 1 Step
40 to 80V 1V
80 to 160V 2V
Control Signal ON
PJ8A-12 Pulse output
Control Signal ON
PJ3A-2 Pulse Output
M-15
OFF WIRING DIAGRAM
3-F
Initial Value
58V
116V
OFF WIRING DIAGRAM
45-H
OFF WIRING DIAGRAM
12-B