Print Quality; Developing Bias - Samsung ML-6060 Service Manual

4-3 Print Quality

Notice
I
n the ML-6060 Series system, the Developing/Supplying bias is set to decrease by -50V increments when
the system load is over the specified value. Therefore, if you check the bias without the toner cartridge, the
system load is recognized to be infinity and Developing/Supplying bias decreases by by -50V increments.
At the first warm-up after the printer is powered on and then off, the software does not have the data on
system load, so the Developing/Supplying bias measures -500V/-650V, the basic voltage.
And, from the second warm-up and on, the software has the data on system load, so the bias measures
-450V/-600V, which is less -50V than the basic voltage.
4-3-1 No Image
terminal of machine
LSU transit to High/Low
The mirror in LSU might be misplaced so the light
path to the OPC deviates ->Repair or replace LSU
or remove any defective matters in the machine.
Samsung Electronics
Download Service Manual And Resetter Printer at http://printer1.blogspot.com
Without cartridge

Developing Bias

Supplying Bias
NO
No image?
YES
Is the OPC
NO
well-connected
to Frame?
YES
Is the
OPCshaft of crv NO
well-connected to
GND terminal
YES
Does the
video data line to NO
when printing?
YES
First Warm-up Second Warm-up
-500V
-6500V
Repair or replace the GND
terminal.
Repair or replace he
GND terminal
Check the path between
video controller, engine board
and HVPS. Repair or replace
the defective component
or board.
Troubleshooting
-450V
-600v
A on
next page
4-3