Read Sharp AR-C330 (serv.man5) Service Manual online
AR-C330 SETTING AND ADJUSTMENTS 7 - 31
Troubleshooting on copy color balance and density
If the copy quality adjustment cannot provide a normal copy quality, check the following items.
Check that the following simulation values are in the specified range. If any value is improper, check the machine conditions and replace
consumable parts or take necessary measures.
consumable parts or take necessary measures.
Perform the following procedures.
Check that the following simulation values are in the specified range. If not, troubleshoot the cause and repair.
SIM No
ITEM
SPEC
NOTE
GR
BS
DV
BS
Standard value
Fixed
Standard value
Fixed
44-9
(NORMAL
MODE)
(2/6)
MODE)
(2/6)
BLACK
333 to 900
545
150 – 700
325
A greater difference between GR-BS(XXX) and
DV-BS(XXX) means a greater correction quantity
of the DV bias voltage and of the main charger grid
voltage. It may be judged that the image process
section conditions are degraded. (The deterioration
degree of developer, the OPC drum, the transfer
belt, the transfer roller, and the main charger, etc.
may be presumed.)
DV-BS(XXX) means a greater correction quantity
of the DV bias voltage and of the main charger grid
voltage. It may be judged that the image process
section conditions are degraded. (The deterioration
degree of developer, the OPC drum, the transfer
belt, the transfer roller, and the main charger, etc.
may be presumed.)
CYAN
305 to 900
555
125 to 700
MAGENTA
YELLOW
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
charger
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
(especially 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
voltage
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
voltage
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
density
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
density
sensor
position
adjustment
44-23
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
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