17 January, 2003
PRINTER ENGINE SERVICE MODE
5-21
Service
Tables
SP2-XXX (Drum)
2
Mode No.
(Class 1, 2, and 3)
Function / [ Setting ]
[Charge Bias]
Charge Roller Bias (
DC
or
AC
component: [Color], Process Speed)
U: Upper, L: Lower
1 DC:[K]
*BCU
2 DC:[Y]
*BCU
3 DC:[M]
*BCU
4 DC:[C]
*BCU
Adjusts the DC component of the charge roller
bias in the various print modes.
Charge bias (DC component) is automatically
adjusted during process control; therefore,
adjusting these settings does not effect while
process control mode (SP3-125 Default: ON) is
activated. When deactivating process control
mode with SP3-125, the values in these SP
modes are used for printing.
[ 300 to 1000 / 700 / 10 volts/step ]
DFU
5 AC:[K]
62.5
•
Displays the AC component of the charge roller
bias adjusted during machine initialization or
process control self-check.
•
Sets AC bias in the various print modes for test
purposes.
If the optimum AC bias cannot be selected
because of the upper and lower limits (SP2-001-
10 and 11 for K, SP 2-001-21 and 22 for YMC),
this may cause white spots on images and black
spots on background. (In particular, spots may
appear if the room temperature is very low.)
Check the printouts after changing the AC bias
with these SP modes (SP2-001-12 to 20) and
exiting SP mode. If increasing or decreasing the
AC bias for relevant color solves the spot problem,
shift the AC upper and lower limits (SP2-001-10
and 11 for K, SP 2-001-21 and 22 for YMC) by the
value increased or decreased during the test.
NOTE:
The AC upper and lower limits have been
optimized by the manufacturer; therefore,
these settings should not be adjusted in
the field.
[ 0 to 255 / 40 / 1/step ]
DFU
6 AC:[K]
125
[ 0 to 255 / 71 / 1/step ]
DFU
7 AC:[K]
185
[ 0 to 255 / 159 / 1/step ]
DFU
8 AC:[Y]
62.5
[ 0 to 255 / 40 / 1/step ]
DFU
9 AC:[Y]
125
[ 0 to 255 / 71 / 1/step ]
DFU
10 AC:[M]
62.5
[ 0 to 255 / 40 / 1/step ]
DFU
11 AC:[M]
125
[ 0 to 255 / 71 / 1/step ]
DFU
12 AC:[C]
62.5
[ 0 to 255 / 40 / 1/step ]
DFU
13 AC:[C]
125
[ 0 to 255 / 71 / 1/step ]
DFU
14 AC Target [K]
*BCU Sets the upper limit of the AC component
adjustable range for black.
During machine initialization and process control
self-check, the AC component of the charge roller
bias is automatically adjusted within the range
specified by SP2-001-014 through 017.
[ 0 to 255 / 86 / 1/step ]
DFU
15 AC Target [Y]
*BCU [ 0 to 255 / 83 / 1/step ]
DFU
16 AC Target [M]
*BCU [ 0 to 255 / 83 / 1/step ]
DFU
001
17 AC Target [C]
*BCU [ 0 to 255 / 86 / 1/step ]
DFU