Sharp AR-BC260 Service Manual page 98

Note:
There are two methods to adjust the color image density sensor;
one method uses the adjustment jig, and the other method does
not use it.
If there is no adjustment jig available, the simple adjustment
(SIM44-36) can be made, which may, however, result in insuffi-
cient adjustment accuracy depending on the machine condition.
If toner, the OPC drum, and the transfer belt are not new ones or
almost new ones, the simple adjustment is not recommended.
Even though the machine conditions are well, the adjustment by
use of the adjustmment jig gives a higher adjustment accuracy
than the adjustment without the adjustment jig (simple adjust-
ment).
Also note that SIM44-36 must not executed unnecessarily after
execution of the color image density sensor adjustment (adjust-
ment by the adjustment jig) with SIM44-13.
If SIM 44-36 is executed, the contents of the color image density
sensor adjustment (adjustment by the adjustment jig) with SIM44-
13 are erased, and the adjustment result of SIM44-36 is saved.
When the color image density sensor is adjusted with SIM44-13
and the black image density sensor is adjsuted with SIM 44-2, the
adjustment with SIM44-36 is not required.
To adjust the black image density sensor, the adjustment jig is not
required.
Before executing this adjustment, check the following items:
• Check that the color imagte density sensor is clean.
• Check that the image density sensor calibration plate is clean.
• Check that the transfer belt is free from scratches.
ADJ 2A Color image density sensor
adjustment (adjustment by the
adjustment jig)
1) Open the front cover of the machine.
2) Insert the color image density sensor adjustment jig
(CPLTM6305FC01) into the long hole in the transfer unit
frame, and close the left cabinet.
3) With the front cover of the machine open (with the cover open/
close switch OFF), turn on the power.
4) The Machine enters Sim 44-13 mode.
SIM 44-13
5) Close the front cover of the machine.
6) Press the [EXECUTE] key.
The adjustment is performed automatically. When the adjust-
ment is completed, the adjustment result is displayed and the
the [EXECUTE] key display returns to the original state.
A PCS_C
B PCS_C
C PCS_C
7) Remove the color image density sensor adjustment jig.
If the adjustment is not completed normally, "ERROR" is dis-
played.
In that case, check the following sections for no abnormality. If
there is any abnormality, repair the part and perform the adjust-
ment again. In case of an error, the adjustment result is not
revised.
• Image density sensor
• PCU PWB
• Transfer belt
Note:
The color image density sensor adjustment jig is available in the
following two forms:
• The jig metal plate with the calibration sheet attached to it
(CPLTM6305FC01)
ADJ 2B
1) Enter the SIM44-2 mode.
2) Press the [EXECUTE] key.
A PCS_C
B PCS K
C PCS_K
D PCS_K
E PCS_K
F BELTMAX Transfer belt surface
G BELTMIN
AR-BC260 SETTING AND ADJUSTMENTS 8 - 5
Display Content
Color image density
CARB ADJ sensor LED current
adjustment target value
Color image density
DARK sensor dark voltage
level
Color image density
LED ADJ sensor current
adjustment value
Black image density sensor
adjustment
The adjustment is performed automatically. When the adjust-
ment is completed, the adjustment result is displayed and the
the [EXECUTE] key display returns to the original state.
Display Content
Color image density
LED ADJ sensor LED current
adjustment value
Black image density
LED ADJ sensor LED Current
adjustment value
Black image density
GAIN sensor output gain
(AMP) adjustment value
Black image density
DARK sensor dark voltage
level
Black image density
GRND sensor transfer belt
surface detection level
max. detection level
(Black image sensor)
Transfer belt surface
min. detection level
(Black image sensor)
Min Max Default
Value Value value
1 255 108
0 255 0
1 255 51
Min Max Default
Value Value value
1 255 51
1 255 51
0 15 0
0 255 0
0 255 0
0 255 0
0 255 0