Read Sharp MX-6500N / MX-7500N (serv.man27) Service Manual online
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 40
c. Secondary transfer belt skew adjustment
c-1. Belt skew detection.
Secondary transfer belt skew is detected by the sensor (a. 2nd
transfer belt skew detection sensor R) or (b. 2nd transfer belt skew
detection sensor F).
transfer belt skew detection sensor R) or (b. 2nd transfer belt skew
detection sensor F).
When the belt skews (A) direction, (a) sensor detects it.
c-2. Belt skew correction.
When the 2nd transfer belt skew is detected, (a) 2nd transfer belt
skew correction motor operates (b) skew correction arm to twist the
2nd transfer belt.
skew correction motor operates (b) skew correction arm to twist the
2nd transfer belt.
(2)
Image density detection and registration detection
The image density and the image registration are detected by the
sensors provided at the front, the center, and the rear of the frame.
sensors provided at the front, the center, and the rear of the frame.
a. Function and operation of the color image density sensor/
image registration sensor
a-1. Image registration sensor
The shift of the image registration (F, C, R) is detected.
a-2. Process control sensor/Image registration sensor
Sensitivity adjustment of the color sensor light receiving ele-
ments (Photo transistors)
ments (Photo transistors)
Purpose: To maintain the sensitivity of the light receiving elements
even if the environmental conditions (temperature and humidity)
vary.
even if the environmental conditions (temperature and humidity)
vary.
Execution timing: This adjustment is executed in the process con-
trol when the temperature or the humidity varies.
trol when the temperature or the humidity varies.
Method: Use the patch written on the primary transfer to adjust the
sensor sensitivity.
sensor sensitivity.
Light emitting current of the sensor LED (Light emitting diode)
Purpose: To maintain the light emitting quantity of the sensor even
if the sensor LED is aged or the environmental conditions vary.
if the sensor LED is aged or the environmental conditions vary.
Execution timing: Every time when the process control is made.
Method: Reflection on the surface of the primary transfer belt is
used to adjust the sensor sensitivity.
used to adjust the sensor sensitivity.
AA
B
$
%
$
%
$
%
AA
AB
$
%
Process control sensor
Image registration sensor
Rear
Y
R
Center
M/BK
C
Front
C
F
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