Lexmark C 540n, Service Manual

Page: 111 / 262

Diagnostic aids
3-21
5025-2xx, 4xx
TPS Setup
Right or Left TPS
The value of the toner density sensor (also called toner patch sensor or TPS) is set at manufacturing. If a sensor
is replaced, enter the 32-digit hexadecimal toner density value (TPS) value from the bar code next to the sensor.
To enter the value:
1.
Select TPS Setup from Diag Menu, and press Select ( ).
2.
Select Right or Left , and press Select ( ).
TPS Right 1-16
or
TPS Left 1-16
appears above a blinking 0 in the left position.
3.
To enter a character or digit:
a.
Press to decrease or to increase the blinking value.
b.
Pause for several seconds without pressing any buttons. The blinking value becomes solid.
If the value is incorrect, use
Back ( ) to go back and reenter the number.
c.
Continue until the last value is reached.
d.
When the last of the 16 values is entered and becomes solid,
TPS Right 17-32
or
TPS Left 17-32
appears.
e.
Continue entering and pausing
4.
After the 32nd number is entered and becomes solid, the number is automatically entered.
•
If the number is incorrect,
Checksum does not match
appears, and the original screen appears to
reenter the value.
•
If the number is correct,
Saving changes to NVRAM
appears.
Cal Ref Adj
Used with Reset Color Cal, which resets to a default value, Cal Ref Adj allows you to fine tune the TPS function.
To set the Cal Ref Adj:
1.
Select TPS Setup from Diag Menu, and press Select ( ).
2.
Select Cal Ref Adj , and press Select ( ).
3.
Select CMY or Black , and press Select ( ).
4.
Press to decrease or to increase the value.
The values can be -8 to +8, and the default value is 0.
To cancel and return to the menus, press Back ( ).
Reset Color Cal
This setting allows the device to adjust the alignment of the color planes using pre-programmed default values.
To reset the programmed value:
1.
Select TPS Setup from Diag Menu, and press Select ( ).
2.
Select Reset Color Cal , and press Select ( ).
Resetting
appears. When the reset is complete, the screen is automatically returned to TPS Setup.