Konica Minolta bizhub pro C6501 User manual

TROUBLESHOOTING GUIDE
C6501/C6501P/C5501
C6500/C6500P/C5500
2008.9
Ver.2.0
CS Operations

Table of contents
1. Low density (under low humidity environment) ・・・・・・・・・・・・・・・・・・・・ 3
2. White spot ・・・・・・・・・・・・・・・・・・・・ 4
3. Carrier attachment to the image ・・・・・・・・・・・・・・・・・・・・ 5
4. Poor transfer ・・・・・・・・・・・・・・・・・・・・ 6
5. Background ・・・・・・・・・・・・・・・・・・・・ 7
6. Repeater Mark ・・・・・・・・・・・・・・・・・・・・ 8
7. Toner spilling ・・・・・・・・・・・・・・・・・・・・ 9
8. White lines (to sub-scan direction) ・・・・・・・・・・・・・・・・・・・ 11
9. Uneven gloss ・・・・・・・・・・・・・・・・・・・ 13
10. Paper waving ・・・・・・・・・・・・・・・・・・・ 14
11. How to maintain consistent color during continuous printing ・・・・・・・・・・・・・・・・・・・ 15
12. Darker at the trailing edge of image ・・・・・・・・・・・・・・・・・・・ 16
13. Problem with non-recommended paper ・・・・・・・・・・・・・・・・・・・ 17
14. How to adjust side1/2 Image registration ・・・・・・・・・・・・・・・・・・・ 18
15. Thin paper jams wrapping around the fusing belt (separation failure)・・・・・・・・・・・・・ 20
16. Blurred image ・・・・・・・・・・・・・・・・・・・ 21
17. Change of color ・・・・・・・・・・・・・・・・・・・ 22
18. White Streaks (drum memory) ・・・・・・・・・・・・・・・・・・・ 23
19. Waste toner packing ・・・・・・・・・・・・・・・・・・・ 24
20. PFU, LU paper no feed under low temperature environment (J16-02) ・・・・・・・・・・・ 25
21. Gloss unevenness on side2 of coated paper (PFU, LU) ・・・・・・・・・・・・・・・・・・・ 27
22. SC28-01 to 04 when machine is powered up ・・・・・・・・・・・・・・・・・・・ 29
23. SC28-31 to 34 (Charging potential correction (Vm) error) ・・・・・・・・・・・・・・・・・・・ 30
24. White (meandering) line (dust attach on PET sheet) ・・・・・・・・・・・・・・・・・・・ 31
25. PFU centering error (image suddenly shifts by 5mm) ・・・・・・・・・・・・・・・・・・・ 32
26. Centering error, skew (how to set paper in PFU) ・・・・・・・・・・・・・・・・・・・ 35
27. Print job is not accepted while machine indicates dehumidifying ・・・・・・・・・・・・・・・ 39
28. Transfer shifts with halftone on thick paper under high humidity ・・・・・・・・・・・・・・・ 40
29. Drum drive error C-22xx ・・・・・・・・・・・・・・・・・・・ 41
30. Depletion of developer after continuous printing ・・・・・・・・・・・・・・・・・・・ 42
31. Abnormal Image ・・・・・・・・・・・・・・・・・・・ 43
32. Coupling shaft breakage of transfer belt unit rear side ・・・・・・・・・・・・・・・・・・・ 44
33. How to perform book printing from Adobe Acrobat (IC303/IC305) ・・・・・・・・・・・・・・・ 45
34. Calibration procedure ・・・・・・・・・・・・・・・・・・・ 58
35. C6501 uneven density correction procedure ・・・・・・・・・・・・・・・・・・・ 63
36. SD-506, tri-fold adjustment procedure ・・・・・・・・・・・・・・・・・・・ 66
37. How to print on custom size (IC303/IC305/IC408) ・・・・・・・・・・・・・・・・・・・ 67
38. Rippled uneven image ・・・・・・・・・・・・・・・・・・・ 68
39. Banding on Halftone ・・・・・・・・・・・・・・・・・・・ 69

1 Low density (under low humidity environment)
[Symptom]
The density is low at solid and highlighted part.
[Probable cause]
Increase of toner charge in developer under low humidity environment.
Decrease of developing ability due to the toner charge increase in developer due to the too
high or too low coverage original.
[Solution]
<Solid part>
Access Service mode=> [02 Process Adjustment] => [04 Process Fine Adjustment] => [02
Develop AC Bias Fine Adj.], then increase the adjustment value for the color which you want to
increase the density.
NOTE:
When the density is increased by the [02 Develop AC Bias Fine Adjustment], carrier
attachment occurrence frequency increases. Therefore, please check no white spot which is
resulted from carrier attachment appears on the solid part.
If [02 Develop AC Bias Fine Adj.] cannot solve the problem, also use [03 Develop AC
Frequency].
NOTE:
When the setting value (frequency) is decreased density increases but the image background
tends to occur. Therefore, please adjust carefully.
After the above adjustment, perform Automatic gamma adjustment from service mode or utility
menu
►Service mode => [02 Process adjustment] => [02 Drum peculiarity adjustment] => [03
Auto Gamma adjustment]
►Utility menu => [03 Machine Admin. Setting] => [01 System setting] => [05 Expert
adjustment] => [08 Execute adjust operation] => [Automatic gamma adj.]
<Highlighted part>
After adjusting the solid part, if the highlight is lighter, perform printer gamma offset adjustment
or Printer gamma offset automatic adjustment.
►Service mode => [01 Machine Adjustment] => [03 Quality Adjustment] => [02 Printer
gamma adjustment] => [01 Printer Gamma Offset adj.] or [02 Printer Gamma Offset Auto
adj.]
►Utility menu => [03 Machine admin. Setting] => [01 System setting] => [05 Expert
adjustment] => [07 Quality adjustment] => [01 Printer gamma offset adj.] or [02 Printer
gamma offset auto adj.]
NOTE: Perform Automatic gamma adjustment immediately before performing this adjustment.
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2 White spot
[Symptom]
White spot appears on the image.
Spot with core Spot without core
A: When symptom occurs only for single color, see probable cause A.
B: If the symptom is solved when changing the paper type to the recommended paper, see
probable cause B.
[Probable causes and solutions]
A: If the spot has core, white spot appears due to the increase of the inside machine
temperature according to the high room temperature or other factor. By the temperature
increase, toner forms core in the developer and the poor transfer (1st transfer/2nd transfer)
occurs around the core, causing the white spots.
If the spot does not have core, the cause is the high charge developer by the many prints
of the low coverage original etc. When the charge amount of the developer increases,
the transfer ability decreases at the part, causing white spots.
To correct the above, perform toner refresh mode:
Utility menu => [03 Machine Admin. Setting] => [01 System Setting] => [05 Expert
Adjustment] => [08 Execute Adjust Operation] => [Toner refresh mode]
If it does not improve, after checking the following setting, perform the toner refresh mode
again.
Service mode => [02 Process adjustment] => [05 Interval/Quantity adjustment] => [03
Auto refresh interval] => [Refresh quantity] => Select from [small], [middle], [large]
Refresh amount Toner consumption per one
refresh operation
Max number for refresh
mode execution
Small A3 solid, 3 sheets equivalent 3 times
Middle A3 solid, 5 sheets equivalent Twice
Large A3 solid, 8 sheets equivalent
(8050 equivalent)
Once
If toner refresh is performed excessively, not only too much toner is consumed but may
cause cleaning failure of the transfer belt (passing through, packing). Therefore, keep the
above max number when performing the refresh mode.
B: If the used paper and the set current for the 1st transfer and the 2nd transfer do not match,
transfer ability becomes poor and tends to generates white spots. To correct the above,
perform 1st transfer manual adjustment and 2nd transfer manual adjustment. For the
adjustment procedure, see 13 Problem with non-recommended paper.
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3 Carrier attachment to the image
[Symptom]
Carrier attaches to the paper and image turns to the leopard-print-pattern with the rough
texture.
[Probable cause]
Environment changes and conditions to cause carrier attachment are satisfied.
[Solution]
To reduce the carrier attachment, adjust the following.
1)Service mode => [02 Process adjustment] => [04 Process fine adjustment] => [01 Covered
margin fine adjustment] (Decrease the set value)
Side effect: Background
2)Service mode => [02 Process adjustment] => [04 Process fine adjustment] => [04 Toner
density fine adj (Increase the set value)]
Side effect: Background
After the above setting changes, ensure to perform automatic gamma adjustment from service
mode or utility menu.
►Service mode => [02 Process adjustment] => [02 Drum peculiarity adjustment] => [03 Auto
Gamma adjustment]
►Utility menu => [03 Machine Admin. Setting] => [01 System setting] => [05 Expert
adjustment] => [08 Execute adjust operation] => [Automatic gamma adj.]
NOTE: When the settings are changed, the developing ability may decrease and the image
density may decrease.
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4 Poor transfer
[Symptom]
Regardless of the color, white spots appear entire image area or in the band area.
A: If the symptom occurs in single color, see probable cause A.
B: If the symptom occurs in all colors, see probable cause B.
C: If the symptom disappears after changing the paper, see Probable cause C.
D: If the carrier attaches, see [3. Carrier attachment to the image].
[Probable causes and solutions]
A: First transfer condition is inappropriate.
If the first transfer current is high, the opposite charge is applied to the toner at the transfer.
Accordingly, toner returns to the drum and poor transfer occurs. If the transfer current is
low, the electric field necessary to perform the normal toner transfer is not obtained and
poor transfer occurs.
To correct the above, adjust the settings suitable for the paper:
For the transfer current, optimum values exist for the 1st transfer and 2nd transfer.
1) For the proper adjustment, the 2nd transfer current should be adjusted first then the
1st transfer current.
2) Adjust the first transfer current from following: [Utility/Counter] => [03 Machine Admin.
Setting] => [01 System Setting] => [05 Expert Adjustment] => [06 Process
Adjustment] => [01 Front & Back Density]. However, when too high or too low value
is entered, the adjustment fails.
B: Change Dipswitch 1-0 (To display process adjustment to user screen) from 0 (Default) to 1.
Then, [Process adjustment] key is accessible from COPY (or MACHINE) screen. (COPY
(MACHINE) => [Paper Setting] => [Change] => [Process Adj.] => [2nd transfer Offset
(Front) and/or (Back)]) Set appropriate 2nd transfer current for each tray referring paper
being used. However, when too high or too low value is entered, the adjustment fails.
C: The set transfer current does not match to the characteristic of the used paper.
Depending on the resistance dispersion of the paper, smoothness and moistness etc, the
proper transfer current setting is different.
Perform adjustment described in the B. If the optimum condition cannot be set, propose
customer to try another paper type.
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5 Background
[Symptom]
Toner attached to the overall white area and background is slightly colored.
A: If the background is created at the process section, see probable cause A.
B: If the background contains the data (like following figure), see probable cause B.
[Probable causes and solutions]
Paper edge
Background appears from approx 3mm inside from the paper
edge.
Linear boundary can be seen.
Dots or lines line regularly.
Enlargement of area for judgment
A: The environment condition changed.
Perform one or more of following adjustments:
►Service mode => [02 Process adjustment] => [04 Process fine adjustment] => [01
Covered margin fine adj]: Increase the set value to depress the background. After
setting, perform auto gamma adjustment.
►Service mode => [02 Process adjustment] => [04 Process fine adjustment] => [03
Develop AC frequency]: Increase the set value to depress the background. After
setting, perform auto gamma adjustment.
►Service mode => [02 Process adjustment] => [04 Process fine adjustment] => [04
Toner density fine adjustment]: Decrease the set value to improve the background.
B: The cause is in the output data.
For the correction, check and correct (remove the dots and the lines from) the image data.
Table of contents
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6 Repeater Mark
[Symptom]
On the output image, cyclic soilage or white area appears.
[Cause]
Failed mechanical part.
・Approx 188mm pitch: Damage on the drum surface.
・Approx 251mm pitch: Damage on the fusing belt
・Approx 53mm pitch: Developer conveyance failure of developing sleeve.
・Approx 95mm pitch: Soiled second transfer roller
[Solution]
Clean or replace the failed part or unit.
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7 Toner spilling
[Symptom]
Toner spills and attaches on the output irregularly.
[Probable cause]
Due to the toner scattering or background (see 5 Background), the inside of the machine is
soiled then toner falls on the paper path from the separation claws etc, causing the soil.
[Solution]
1) Check the status of dust proof filter/1 assembly (A03UR70100) at the right side of main
body. If too much toner scattering is confirmed, replace the filter, clean the developing
unit upper cover (Fig.1) and process carriage (Fig 2) on which the developing unit is
installed. Also, clean the drum cartridge stay (Fig.3)
Right side
Clean developing unit upper cover
Fig. 1: Developing unit upper cover
Fig 2: Where should be cleaned on Process carriage
9

Drum cartridge stay
Fig 3: Drum cartridge stay
2) After taking out the process carriage, if inside of the machine is very dirty, replace the dust
proof filter/2 assembly (65AAR71800) at the main body rear side.
Rear side
3) Clean around the paper conveyance section and separation claws etc. After cleaning,
feed around 10 sheets of blank A3 paper to remove the dust in the paper path.
* CAUTION:
When toner spilling occurs, remove all charging coronas first then take out the process
carriage. It is to prevent the charging corona from becoming soiled by the removal
/installation of the process carriage.
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