Transfer Belt - Konica Minolta bizhub C650 Service Manual

10. Service Mode
Setting/ 1. Call the Service Mode to the screen.
2. Touch these keys in this order: [Image Process Adjustment] → [Gradation Adjust].
Procedure
3. Touch [Stabilizer] and the Start key to perform image stabilization.
NOTE
• Before executing Gradation adjust, be sure to perform Stabilizer.
4. Select the appropriate mode for the gradation adjustment.
5. Press the Start key to let the machine produce a test pattern.
NOTE
• When the image stabilization performed in step 3 is NG, the Start key stops
functioning.
• When one of the alert codes, P-5, P-6, P-7, P-8, P-9, and P-28 is on the screen
and [Gradation Mode] is selected, the Start key stops functioning.
6. Place the test pattern produced on the original glass.
7. Place ten blank sheets of A3/11x17 paper on the test pattern and lower the original
cover.
8. Press the Start key. (The machine will then start scanning the test pattern.)
9. Touch [OK] and repeat steps from 4 through 8 twice (a total of three times).
10.Touch [Gradation Adjust] to display the Adj. Values and Conv. Values of each color
(C, M, Y and K) for Dark and Highlight.
11.Use the following procedures to check the Conv. Value.
Dark: 0 ± 100 and Highlight: 0 ± 60: It completes the adjustment procedure.
If neither Dark nor Highlight falls outside the ranges specified above: Perform
steps from 4 to 8.
NOTE
• If the convergence falls within the specified range after the second Gradation
Adjustment, further adjustment may not be necessary.
• If a fault is detected, "0" is displayed for all values. In that case, after turning off the
main power switch, turn it on again more than 10 seconds after and then make the
gradation adjustment again.
• If either dark or highlight still remains outside the specified ranges perform D Max
Density.
• If a total of four sequences of gradation adjust do not bring the values into the speci-
fied range, check the image.
• If the image is faulty, perform the troubleshooting procedures for image problems.
10.6.2

Transfer Belt

A. Cleaning Bias
Functions • To set the level of transfer belt cleaning bias independently for each process speed.
Use • When the image pattern is not completely removed, it strengthen the transfer belt
cleaning bias in order to make the cleaner more effective.
• For each processing speed, positive and negative output values can be set.
Setting/ • The each default setting is 0.
Procedure
*: One step corresponds to 5 μA.
462
Field Service Ver. 8.0 Jun. 2008
-5 to +5 (step:1 *)