Read Sharp AR-C270 (serv.man11) Service Manual online
Perform the following procedures.
JOB No
WORK ITEM
SIM No
Trouble caused by improper
adjustment
NOTE
ADJ M4 High
voltage
adjustment
adjustment
ADJ 1 Main
charger
grid
voltage
adjustment
grid
voltage
adjustment
8-2
Improper image density (especially
in the high density section), improper
copy, image density section copy
abnormality, chip on the edge of
half-tone images
in the high density section), improper
copy, image density section copy
abnormality, chip on the edge of
half-tone images
If the digital
multi-meter
and the
high
voltage
probe
specified
on the
Service
Manual are
not
available,
set the
adjustment
value to the
default.
multi-meter
and the
high
voltage
probe
specified
on the
Service
Manual are
not
available,
set the
adjustment
value to the
default.
Check and adjust when the high
voltage PWB (Main charger / DV
bias) is replaced. / Adjust when the
output is not in the specified level. /
Check and adjust when the
copy/print quality (density, color
balance) adjustment does not
provide a satisfactory result.
voltage PWB (Main charger / DV
bias) is replaced. / Adjust when the
output is not in the specified level. /
Check and adjust when the
copy/print quality (density, color
balance) adjustment does not
provide a satisfactory result.
ADJ 2 DV bias
voltage
adjustment
adjustment
8-1
Improper image density, improper
copy, image density section copy
abnormality, chip on the edge of
half-tone images
copy, image density section copy
abnormality, chip on the edge of
half-tone images
Check and adjust when the high
voltage PWB (Main charger / DV
bias) is replaced. / Adjust when the
output is not in the specified level. /
Check and adjust when the
copy/print quality (density, color
balance) adjustment does not
provide a satisfactory result.
voltage PWB (Main charger / DV
bias) is replaced. / Adjust when the
output is not in the specified level. /
Check and adjust when the
copy/print quality (density, color
balance) adjustment does not
provide a satisfactory result.
ADJ 3 Transfer
voltage
adjustment
adjustment
44-30
Improper image density, half-tone
image section improper copy, high
density image section density
unevenness and improper copy, low
density inside image outline
image section improper copy, high
density image section density
unevenness and improper copy, low
density inside image outline
Check and adjust when the high
voltage PWB (Transfer) is replaced.
/ Adjust when the output is not in the
specified level. / Check and adjust
when the copy/print quality (density,
color balance) adjustment does not
provide a satisfactory result.
voltage PWB (Transfer) is replaced.
/ Adjust when the output is not in the
specified level. / Check and adjust
when the copy/print quality (density,
color balance) adjustment does not
provide a satisfactory result.
ADJ M6 Image
density
sensor
adjustment
sensor
adjustment
ADJ 1 Image
density
sensor
calibration
sensor
calibration
44-13
Because of improper operation of
the process correction (high density
section image density correction),
parameters of the voltage, the
current, and the laser power of the
process section become improper to
cause improper image density,
improper copy, abnormal copy, chip
on the edge of half-tone image, tone
gap, improper color balance, etc. /
Error F2-44 – 45, 80 – 90
the process correction (high density
section image density correction),
parameters of the voltage, the
current, and the laser power of the
process section become improper to
cause improper image density,
improper copy, abnormal copy, chip
on the edge of half-tone image, tone
gap, improper color balance, etc. /
Error F2-44 – 45, 80 – 90
Adjust when the copy/print quality
(density, color balance) adjustment
does not provide a satisfactory result
or when an error F2-44 – 45, 80 – 90
occurs.
(density, color balance) adjustment
does not provide a satisfactory result
or when an error F2-44 – 45, 80 – 90
occurs.
ADJ 2 Image
density
sensor
position
adjustment
sensor
position
adjustment
44-23
Check that the following simulation values are in the specified range. If not, troubleshoot the cause and repair.
SIM No
ITEM
Display value at 25°C, 70%
(Reference value)
Phenomenon when the sensor operation is abnormal
NOTE
44-14
TEMPERATURE
100 to 120
The process section
correction for change in
temperature/humidity is not
performed. (Toner density,
transfer voltage, resist roller
RPM corrections)
correction for change in
temperature/humidity is not
performed. (Toner density,
transfer voltage, resist roller
RPM corrections)
(Improper color balance,
abnormal copy, improper copy,
toner dispersion, improper
image density, image deflection,
image dirt, decreased density
inside image outline)
abnormal copy, improper copy,
toner dispersion, improper
image density, image deflection,
image dirt, decreased density
inside image outline)
Check the relationship
between the actual
environment and the
sensor output level, and
check that the sensor is
operating properly.
between the actual
environment and the
sensor output level, and
check that the sensor is
operating properly.
HUMIDITY
35 to 45
Check that the following simulation values are normal. If not, troubleshoot the cause and repair.
SIM No
ITEM
LAST(BUP)
LEVEL
Phenomenon caused by
improper set value
NOTE
44-16
BLACK
Improper image density,
improper copy, improper color
balance, toner dispersion,
developer dispersion
improper copy, improper color
balance, toner dispersion,
developer dispersion
If the difference between LAST
(BUP) and LEVEL is extremely
great, the toner density control
may not function properly.
(BUP) and LEVEL is extremely
great, the toner density control
may not function properly.
(TONER
DENSITY)
(1/3)
DENSITY)
(1/3)
CYAN
MAGENTA
YELLOW
SIM No
ITEM
LV-ORG
DV
HUD
LV
Phenomenon caused by improper
set value
NOTE
44-16
BLACK
Toner density
correction is
nor performed
properly.
correction is
nor performed
properly.
Improper image
density, improper
copy, improper
color balance, toner
dispersion,
developer dispersion
density, improper
copy, improper
color balance, toner
dispersion,
developer dispersion
The toner density
correction levels for the
use frequency of
developer and the humidity
are displayed. Check that
those levels are proper.
correction levels for the
use frequency of
developer and the humidity
are displayed. Check that
those levels are proper.
(ATC
SENSITIVITY
REVISE)
(3/3)
SENSITIVITY
REVISE)
(3/3)
CYAN
MAGENTA
YELLOW
7 – 34
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