10. Service Mode
Field Service Ver. 1.0 Jun. 2008
168
Adjustment / Setting
10.4.7
Toner Supply
10.4.8
Monochrome Density Adjustment
10.4.9
Dev. Bias Choice
Functions
• To adjust the set T/C level by replenishing an auxiliary supply of toner when a low ID
occurs due to a lowered T/C after large numbers of prints have been made of origi-
nals having a high image density.
Use
• When there is a drop in T/C.
Setting/
Procedure
1.
Call the Service Mode to the screen.
2.
Touch these keys in this order: [Imaging Process Adjustment]
o
[Toner Supply].
3.
Select the color, for which supply of toner is to be replenished.
4.
Pressing the Start key will let the machine detect the current toner density and; if the
density is lower than a reference value, a toner replenishing sequence and then a
developer agitation sequence are run.
5.
These sequences are repeated up to a maximum of four times until the toner density
reaches the reference value. If the toner density is found to be higher than the refer-
ence value, only a developer agitation sequence is carried out.
Functions
• To fine-adjust the density of the printed image for a black print.
Use
• To vary the density of the printed image of a black print.
Adjustment
Range
• The default setting is 0.
-2 to +2 (step: 1)
Adjustment
Instructions
If the black is light, touch [+].
If the black is dark, touch [-].
Setting/
Procedure
1.
Call the Service Mode to the screen.
2.
Touch these keys in this order: [Imaging Process Adjustment]
o
[Monochrome Den-
sity Adjustment].
3.
Change the setting value using the [+] / [-] keys.
Functions
• To change the setting of the developing bias voltage.
• When this function is turned ON, it decreases the developing bias voltage, thereby
preventing voltage leak from occurring.
Use
• Use when patches of white occur in the image in an ambience of low atmospheric
pressure, such as in high altitudes.
• If ON is set, the screen doesn’t display [Service Mode]
o
[Imaging Process Adjust-
ment]
o
[Gradation Adjust] and the Gradation Adjust is not allowed.
Setting/
Procedure
• The default setting is OFF.
ON
“OFF”
d-Color MF201
Service Manual Y109660-1
