7823
TAUS0611769EN00
Solution ID
66
Solution Usage
Description
Poor color reproduction or image quality.
Solution
PROBABLE CAUSES:
1. Color calibration abnormality. Perform Gradation Adjustment as outlined in 7823 Service Manual. It is crucial to reset PRT Highlight and PRT Max Density
values to zero before each adjustment is performed. After setting the values to zero, power OFF/ON the 7823 to allow the data to be completely written
Compare to attached samples of Gradation Chart and Image Processing Data Sheets to determine if calibration is properly completed.
Notes:
1. Use high quality paper of a Brightness Scale of 96 or better when performing the Gradation Adjustment. For optimal performance, the end user should
also use this type of paper.
2. While the 7823 Service Manual recommends performing the Gradation Adjustment three times to ensure stability, the Gradation Adjustment may need to
be done 8 to 10 times to properly stabilize.
See pages D-137 , S-17 and S-32 in the 7823 Service Manual for information on performing the Gradation Adjustment and resetting the PRT
Highlights/PRT Max Density to zero.
2. The AIDC sensor mylar cover has become damaged or scratched. Replace the AIDC sensor (p/n 25TU-9100).
3. View the Drum Memory Document hyperlink for steps to troubleshoot drum problems.
Note: To view the above PDF, Acrobat* Reader must be installed. Acrobat Reader can be downloaded for free from the Adobe* Web site at:
[[http://www.adobe.com/products/acrobat/readstep2.html| URL http://www.adobe.com/products/acrobat/readstep2.html]]
4. Failure to properly clean and replace parts at the required intervals. To ensure the optimal operation of the 7823, perform the 7823 Service Call Checklist
below:
Each visit or 5K, clean the following:
1. Oil regulating blade (p/n 1144-5803-05)
2. Oil collecting blade (p/n 1154-5852-01)
Each visit between 5K to 15K, clean the following:
1. Fuser entrance guide
2. Fuser roller thermistor - upper and lower
3. Fuser roller thermostat - upper and lower
4. Toner anti-spill seal (p/n 25TU55340)
5. Auxiliary erase lamp (p/n 25TU37240)
6. AIDC sensor (p/n 25TU-9100)
7. Mirror (1st, 2nd and 3rd)
8. Lens filter
9. Original glass
10. Paper separation corona assembly (p/n 11UM-2600)
11. Paper separation finger (p/n 11UM53980, 11UM53770, and 11UM53800)
12. Static charge roller (p/n 25TU45390)
13. Static charge roller rubber (p/n 25TU45010)
14. Static charge roller scraper (p/n 25TU45380)
15. Static charge roller cover (p/n 25TU45340)
16. Static charge roller assembly (p/n 11UM45370)
17. Transport sprocket (p/n 25TU77780)
Note: Failure to clean the fuser roller thermistor and thermostat (items 2 and 3) may cause a buildup that could cause intermittent fuser High/Low
temperature codes and generate unnecessary service calls.
Replace at 10K:
1. Grid mesh (p/n 25TU25140)
Replace at 15K:
1. Cleaning roller (p/n 25TU53200)
2. Oil filter (p/n 25TU53610)
3. PC drum charge corona wire assembly (p/n 11UM25090)
4. Cleaning blade (p/n 25TU55400)
4. Clean the corona wire with cotton swab and alcohol, wipe wire with clean cloth to remove any residual.
5. Clean the grid with a Scotchbrite* pad.
* Trademark ownership information
TAUS0607937EN00
Solution ID
19
Solution Usage
Description
2
Copyright 2006, Konica Minolta Business Solutions U.S.A., Inc.
October 2006
(152 paginas)
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