Adj 2] Image Density Sensor Adjustment - Sharp AR-BC260 Service Manual

7) Apply a digital multi-meter to the connector pins of the high
voltage adjustment harness corresponding to the output mode
to be adjusted.
8) Press the [EXECUTE] key.
The developing bias voltage is outputted for 30sec.
If this operation is performed for a long time, the OPC drum
and the developing roller may be damaged. Be careful to per-
form this operation in a short time.
It is advisable to install an unnecessary developing unit and
unnecessary OPC drums to the machine for this adjustment.
9) Check the monitor voltage with the digital multi-meter.
If the monitor voltage is not in the above specified range,
change the adjustment value and adjust again. If the specified
voltage is not obtained even by changing the adjustment
value, the following parts may be judged as defective.
High voltage PWB
PCU PWB
Developing unit
Photoconductor unit
High voltage circuit electrode
Item
A PLAIN SPX CL Color Normal paper
B PLAIN DPX CL Color Normal paper(Duplex mode)
C OHP1 CL Color Transparency film 1
D OHP2 CL Color Transparency film 2
E HEAVY P1 SPX CL Color Thick paper 1
F HEAVY P1 DPX CL Color Thick paper 1(Duplex mode) 58.5mm/s 188 173 142 142
G HEAVY P2 CL Color Thick paper 2
H ENVELOPE CL Color Envelope
I PLAIN SPX BW B & W Normal paper
J PLAIN DPX BW B & W Normal paper(Duplex mode)
K OHP1 BW B & W Transparency film 1
L OHP2 BW B & W Transparency film 2
M HEAVY P1 SPX BW B & W Thick paper 1
N HEAVY P1 DPX BW B & W Thick paper 1(Duplex mode) 58.5mm/s 178
O HEAVY P2 BW B & W Thick paper 2
P ENVELOPE BW B & W Envelope
Color Actual output variable range Voltage change/Adjustment value (1) (Varying amount when the adjustment value is changed by 1)
K 0 to 4000V
C 0 to 4500V
M 0 to 6000V
Y 0 to 6000V
Press the [EXECUTE] key to output the transfer voltage.
ADJ 2 Image density sensor adjustment
The image density sensor sections are of uneven quality in parts
and assembly. This causes variations in the absolute detection
level between machines. This adjustment (calibration) is per-
formed to correct the variations.
This adjustment is required in the following cases:
• When the image density sensor is replaced.
• When the transfer unit is replaced.
• When maintenance is performed.
• When U2 trouble occurs.
• When the PCU PWB is replaced.
• When the EEPROM on the PCU PWB is repalced.
ADJ 1C
This adjustment must be performed in the following cases:
• When the high voltage power PWB is replaced.
• When a U2 trouble occurs.
• When the PCU PWB is replaced.
• When the EEPROM of the PCU PWB is replaced.
1) Enter the SIM 8-6 mode.
2) Select the mode to be adjusted with the color key and scroll
3) Enter the adjustment value (specified value), and press the
Print mode
78mm/s
78mm/s
78mm/s
58.5mm/s 137 150 153 163
58.5mm/s 158 146 122 122
58.5mm/s 173 159 132 132
78mm/s
117mm/s 168
117mm/s 178
78mm/s
58.5mm/s 137
58.5mm/s 147
58.5mm/s 163
117mm/s 168
The targets of the adjustment are the color image density sensor
and the black image density sensor. There are following adjust-
ment methods:
• Color image density sensor adjustment (adjustment by the
adjustment jig) SIM44-13
• Black image sensity sensor adjustment SIM44-2
• Image density sensor adjustment (The color image density sen-
sor and the black image density sensor are adjusted at the
same time.) (Simple adjustment) SIM44-36
Normally the following adjustments are executed:
• ADJ 2A Color image density sensor adjustment (adjustment by
the adjustment jig) (SIM44-13)
• ADJ 2B Black image density sensor adjustment (SIM44-2)
AR-BC260 SETTING AND ADJUSTMENTS 8 - 4
Transfer voltage adjustment
SIM 8-6
key.
[OK] key.
By entering the default value (specified value), the specified
voltage is outputted.
Standard setting
Adjustment
value (Default)
range
K C M Y
153 141 119 119 51 - 255
168 155 129 129
204 187 153 153
153 141 119 119
204
About 19.6V
About 22.1V
About 29.4V
About 29.4V
Output voltage (Kv)
K C M Y
2 2 2 2
2.3 2.3 2.3 2.3
3 3 3 3
1.7 2.2 3 3.3
2.1 2.1 2.1 2.1
2.7 2.7 2.7 2.7
2.4 2.4 2.4 2.4
2 2 2 2
2.3
2.5
3
1.7
1.9
2.5
2.2
2.3