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FS-2000D, FS-3900DN, FS-4000DN, FS-2020D, FS-3920DN, FS-4020DN
GRAY BACKGROUND ISSUE
TROUBLESHOOTING GUIDE
KDE PRODUCT ENGINEERING
FS-2000D, FS-3900DN, FS-4000DN, FS-2020D, FS-3920DN, FS-4020DN
GRAY BACKGROUND ISSUE
TROUBLESHOOTING GUIDE INDEX
Page 2
Hardware issue Page 3
Software issue Page 7
Appendix Page 9
HARDWARE ISSUE
Page 3
As countermeasures against the fog image from the discolored main charge roller surface, the following points were changed so that the main
charger roller surface can be better cleaned.
1. Change of the BUSH MC ROLL:
The hole of the bush was changed from oval to round in order to limit vertical movement of the cleaning brush within the oval hole.
(Change of the hole of the brush opposite to the drive side was informed by SB-2F8-0025-8520.)
2. Change of the ROLLER MC CLN B:
The brush density was changed from 180KF to 120KF in order to adjust contact pressure with the MC roller due to the change above.
3. Adding SHEET ROLLER DRUM:
The SHEET ROLLER DRUM was added in order to prevent toner from passing through to the drum (DK-320 only).
Detailled information you will find in Service Bulletin 2F8-0036(A053)
HARDWARE ISSUE
Page 4
If the background (related on DK-320/MC-302) still occurs, please follow the next steps:
Sample 1 Sample 2
Sample 3 Sample 4
continue on the next page
HARDWARE ISSUE
Page 5
continue on the next page
HARDWARE ISSUE
Page 6
SOFTWARE ISSUE
Page 7
The gray background might appear when refilling toner.
The margin for gray background was improved by regulating the amount of refilled toner when the toner is installed after [Replace toner] or
[Low toner] was displayed.
These versions are implemented in the Released Firmware Version 08.00.0030!
Detailled information you will find in Service Bulletin 2J0-0029 (B398)
SOFTWARE ISSUE
Page 8
When the weather gets colder, the heating behavior of the user may changes.
That might be the reason why the humidity values, measured by the machine, can not match with the actual environment
variables.
Wrong voltages can be generated by the distortions of this measurement.
Therefore please install the customized "low temperatur" firmware:
FTP Link: Low Temperatur Firmware
This technical publication is confidential information that is the property of Kyocera Document Solutions. It is solely
for the use of Kyocera Document Solutions authorized dealers. This information may not be published, reproduced,
sold, or copied in any media.
Its unauthorized use is prohibited. This information is an addition to and in no way a substitute for any service
bulletin or service manual that we may otherwise produce. Page 9