2NP
1-3-59
U091
How to view test copies
Setting: Threshold value setting
1. Select the item to be set.
2. Change the value using the +/- or numeric keys.
* : Normally the Threshold (Com) value should not be changed from 112, the initial setting.
If white lines appear even though the CIS roller and glass are not dirty, raise the set value.
If fine lines in some originals disappear, lower the set value.
Set within the range 50 to 200. (If set outside this range, the image may be affected.)
3. Press the start key. The value is set.
Completion
Press the stop key. The screen for selecting a maintenance item No. is displayed.
Item No.
Description
blank sheet
black band
Causes
Corrective measures
No lines
No lines
-
Complete
Black lines
White lines
Dirty CIS roller or CIS
glass
Clean CIS roller or CIS glass
and then perform U091 again
Black lines
No lines
Engine side
U091 ends, check engine
No lines
White lines
Engine side
U091 ends, check engine
Display
Description
Setting
range
Initial
setting
Threshold
(R)(G)(B)
Displaying of abnormal pixel detection
threshold value for color RGB
0 to 1023
112/112/
112
Threshold
(Abnormal)
Abnormal pixel threshold value setting
0 to 8191
75
Mode
Switching between white line correction
mode ON/OFF
0: OFF/
1: ON/
2: Test mode
0
Summary of Contents for TASKalfa 2551ci
Page 1: ...SERVICE MANUAL Published in September 2016 842NP11A 2NPSM06A Rev A TASKalfa 2551ci ...
Page 10: ...This page is intentionally left blank ...
Page 97: ...2NP 1 1 2 74 This page is intentionally left blank ...
Page 259: ...2NP 1 3 162 U486 Details on the modes Figure 1 3 47 Item No Description ...
Page 473: ...2NP 1 5 62 This page is intentionally left blank ...
Page 497: ...2NP 2 1 22 This page is intentionally left blank ...
Page 555: ...2NP 2 3 48 This page is intentionally left blank ...
Page 584: ...Installation Guide DP 770 B Document processor DP 772 Document processor Installation Guide ...
Page 620: ...DP 773 Document processor Installation Guide ...
Page 646: ...PF 791 500 x 2 Paper feeder Installation Guide ...
Page 654: ...PF 810 3000 sheets deck Installation Guide ...
Page 667: ...DF 770 D Document finisher Installation Guide ...
Page 685: ...AK 740 Bridge unit Installation Guide ...
Page 687: ...PH 7A C D Punch unit Installation Guide ...
Page 708: ...DT 730 B Document tray Installation Guide ...
Page 710: ...5 2013 5 302LC56750 01 H F G D D 6 4 3 7 E C D D M4 8 M4 8 M4 8 M4 8 ...
Page 711: ...FAX System W B Installation Guide ...