Tcr Level Setting; Background Voltage Margin - Konica Minolta bizhub C650 Service Manual

10. Service Mode
10.6.4

TCR Level Setting

Functions • To adjust the T/C control level when an abnormal image density occurs as a result of
a change in the amount of charge of toner and carrier due to an environmental
change.
Use • Use when T/C changes due to changes in environmental conditions of the user site.
Adjustment • The default setting is 0.
Range
(1 step in positive (+) direction: 0.5 % increase, 1 step in negative (-) direction: 0.05 %
Adjustment To increase T/C, increase the setting value.
Instructions To decrease T/C, decrease the setting value.
Adjustment 1. Call the Service Mode to the screen.
2. Touch these keys in this order: [Process] → [TCR Level Setting].
Procedure
3. Select the color to be adjusted.
4. Enter the new setting from the 10-Key pad and [+/-] key.
5. Touch [END] to validate the adjustment value.
6. Check the copy image for any image problem.
10.6.5

Background Voltage Margin

Functions • To adjust the highlight portion (fog level) to the target reproduction level by making an
auxiliary manual fine-adjustment of γ of each color after gradation adjust.
Use • Use when a foggy background occurs due to a printer problem.
Adjustment • The default setting is 0.
Range
Adjustment To make the background level foggier, decrease the setting value.
Instructions To make the background level less foggy, increase the setting value.
Setting/ 1. Call the Service Mode to the screen.
2. Touch these keys in this order: [Imaging Process Adjustment] → [Background Volt-
Procedure
age Margin].
3. Select the color to be adjusted.
4. Enter the new setting from the 10-key pad.
5. Touch [END] to return to the [Image Adjust] menu screen.
6. Touch [Stabilizer].
7. Touch [Stabilization Only].
8. Press the Start key to validate the adjustment value.
9. Check the copy image for any image problem.
NOTE
• If the setting value has been changed, be sure to run an image stabilization
sequence to make valid the new value.
464
-3 to +3
decrease, Center value 0 corresponds to 7 % T/C ratio.)
-5 to +5 (step: 1)
Field Service Ver. 8.0 Jun. 2008