Gestetner B003 Service Manual page 220

SERVICE PROGRAM MODE
SP2 Mode Number
2969* LD – PWM Selection
1* Printer Output LD – PWM
Selection
2* Fax Output LD – PWM
Selection
2971 Toner Full Sensor Count
2972* Grayscale Limit
1* Upper Limit
2* Lower Limit
2973* 1* Grayscale Copy Interval
Check
2974* 1* Image Density Adjustment
2980* Charge Counter
B003/B004/B006/B007
Function and [Setting]
Changes the LD power PWM control for printed
copies. A smaller value produces a lighter image.
Use this SP to adjust the image density for printing
from a personal computer or printing a received fax
message.
[1 ~ 5 / 1 / 1 step]
Changes the LD power PWM control for printed fax
messages. A smaller value produces a lighter
image
Use this SP to adjust the image density for printing
fax messages.
[1 ~ 5 / 1 / 1 step]
DFU
A new feature of this machine that controls the
halftone density level to prevent deterioration of the
OPC. The halftone density is detected by an ID
sensor that adjusts the intensity of the LD beam
according to the upper/lower limit setting.
Defines the upper limit for grayscale.
A larger value sets a wider halftone width, a smaller
value a narrower width. A smaller value can
eliminate the appearance of white dots in dark
areas.
[0 ~ 100 / 85 / 1 step]
Defines the lower limit for grayscale.
A larger value sets a narrower halftone width; a
smaller value sets a wider width.
[0 ~ 100 / 65 / 1 step]
Sets the halftone operation interval in order to
prevent deterioration of the OPC. If the number of
copies exceeds this setting, at the end of the job, or
if the door is opened and closed, charge correction
is executed.
[0 ~ 1000 / 100 / 10 step]
Adjusts image density. Changing this setting
adjusts development bias and ID sensor output
voltage that in turn raises or lowers image density.
[1 ~ 5 / 3 / 1 step]
Sets the number of pages to print after toner and
carrier initialization before the charge input is
increased to compensate for deterioration over time
in the polarity of the carrier.
[0 ~ 1000000 / 0 / 1 step]
The strength in the polarity of the carrier in the
toner will eventually decrease and cause lower
charge output. Setting the charge output to
increase after a specified number of copies can
compensate for this effect.
5-14 SM