Service manual

30 July, 2001 PRINTER ENGINE SERVICE MODE
5-13
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] 62.5 *
2 DC:[K] 125 *
3 DC:[K] 185 *
4 DC:[Y] 62.5 *
5 DC:[Y] 125 *
6 DC:[M] 62.5 *
7 DC:[M] 125 *
8 DC:[C] 62.5 *
9 DC:[C] 125 *
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
10 AC U Limit [K] * 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 SP2-001-010 and 011.
[0 to 255 / 103 / 1/step ] DFU
11 AC L Limit [K] * Sets the lower limit of the AC component
adjustable range for black.
[0 to 255 / 97 / 1/step ] DFU
12 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 / 71 / 1/step ] DFU
13 AC:[K] 125
[0 to 255 / 71 / 1/step ] DFU
14 AC:[K] 185
[0 to 255 / 148 / 1/step ] DFU
15 AC:[Y] 62.5
[0 to 255 / 71 / 1/step ] DFU
16 AC:[Y] 125
[0 to 255 / 71 / 1/step ] DFU
17 AC:[M] 62.5
[0 to 255 / 71 / 1/step ] DFU
18 AC:[M] 125
[0 to 255 / 71 / 1/step ] DFU
19 AC:[C] 62.5
[0 to 255 / 71 / 1/step ] DFU
001
20 AC:[C] 125
[0 to 255 / 71 / 1/step ] DFU