Dc Charge Adjust, Dev Bias Adj, Transfer Adjust; Tps Setup; Right Or Left Tps; Cal Ref Adj - Lexmark C540 Service Manual

5025-2xx, 4xx

DC Charge Adjust, Dev Bias Adj, Transfer Adjust

Each of these three settings enables you to adjust the high voltage levels controlling the electrophotographic
process. You will use these settings to compensate for unusual operating circumstances such as high humidity.
The printer uses the value of these settings together with other settings to calculate printing speed and media
selection.

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
b.
Pause for several seconds without pressing any buttons. The blinking value becomes solid.
If the value is incorrect, use Back (
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
The values can be -8 to +8, and the default value is 0.
To cancel and return to the menus, press Back (
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Service Manual
to decrease or to increase the blinking value.
to increase the value.
).
).
) to go back and reenter the number.
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