Service manual

ENGINE SERVICE MODE
SM 5-19 G130/G131
Service Tables
SP2-XXX (Drum)
2001
[Charge Bias] Charge Roller Bias (DC or AC component: [Color], Process Speed)
U: Upper, L: Lower
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.
2001 001 DC: [K] *BCU
2001 002 DC: [Y] *BCU
2001 003 DC: [M] *BCU
2001 004 DC: [C] *BCU
[300 to 1000 / 620
/ 10 volts/step] DFU
• 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 settings of SP2-001-014 through 017,
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 (SP2-001-005 through 013)
and exiting SP mode. If increasing or decreasing the AC bias for relevant color solves the spot
problem, shift the AC target (SP2-001-014 through 017) by the value increased or decreased
during the test.
2001 005 AC: [K] L *BCU
2001 006 AC: [K] M *BCU
2001 007 AC: [K] H *BCU
[0 to 255 / 170
/ 1/step] DFU
2001 008 AC: [Y] L *BCU
2001 009 AC: [Y] M *BCU
[0 to 255 / 170
/ 1/step] DFU
2001 010 AC: [M] L *BCU
2001 011 AC: [M] M *BCU
[0 to 255 / 170
/ 1/step] DFU
2001 012 AC: [C] L *BCU
2001 013 AC: [C] M *BCU
[0 to 255 / 170
/ 1/step] DFU
AC Target [K] *BCU [0 to 255 / G130: 79, G131: 117 / 1/step] DFU 2001 014
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.
2001 015 AC Target [Y] *BCU [0 to 255 / G130: 78, G131: 116 / 1/step] DFU
2001 016 AC Target [M] *BCU [0 to 255 / G130: 79, G131: 117 / 1/step] DFU
2001 017 AC Target [C] *BCU [0 to 255 / G130: 78, G131: 116 / 1/step] DFU
[LD Control] LD Power Control
([Color Mode, Color], Process Speed, K or Color mode) P: Power, M: Magnification
2103
Adjusts the laser power by changing the current applied to LD.
Laser power is automatically adjusted during process control; therefore, adjusting
these data has no effect while Process Control (SP3-125 Default : ON) is activated.
After deactivating Process Control with SP3-125, the values in these SP modes are
used for printing.
2103 001 P:[K] L C *BCU [0 to 1023 / 702 / 1/step] DFU
2103 002 P:[K] M C *BCU [0 to 1023 / 683 / 1/step] DFU
2103 004 P:[Y] L C *BCU [0 to 1023 / 702 / 1/step] DFU
2103 005 P:[Y] M C *BCU [0 to 1023 / 683 / 1/step] DFU
2103 007 P:[M] L C *BCU [0 to 1023 / 702 / 1/step] DFU
2103 008 P:[M] M C *BCU [0 to 1023 / 683 / 1/step] DFU
2103 010 P:[C] L C *BCU [0 to 1023 / 702 / 1/step] DFU
2103 011 P:[C] M C *BCU [0 to 1023 / 683 / 1/step] DFU