| Quote: | | | | | | | |
| I have quit a few of these 3 year old "off lease" machines out there now. I still have trouble with "not so dark" blacks.
In the manual it says which way to change Dev bias, Dev duty, Dev Sbias and TC, but I wonder which adjustments are more prefered/correct over the others? And maybe how much deviation from default is acceptable?
Also, I service some Canon "laser" copiers and the Laser unit itself needs cleaned when copies get light and routine Dev and toner and voltage "fixes" don't seem to help.
Do these machines need their lasers removed, opened, cleaned and reinstalled? Even some of the tinkertoy Brother lasers need that "laser cleaning" frequently!
I prefer to clean what is dirty than adjust voltages to compensate for "Foggy mirrors" in the laser or elsewhere@! | |
| | |
try to isolate it first. are you using good paper? because moist paper will give you this prob.does your drum still good? does that problem occurs from the PRINT(e.g. service mode list) or from the COPY? if it gives you light image from the print first then you have to clean the laser unit but if its from the copy(and you dont want to replace parts) then try this:
- clean all the mirrors(optics) or,
- look on the copy default of the machine, are they all on its standard settings? maybe it is all set to lighter mode or scanning of original is set to photo instead of photo+text or text mode or,
- maybe your toner(replace your dev.unit) or,
- check transfer roller or
- if your drum is still usable, there is bias adjustment in this unit. pull it out, on the top right there is a VR(yellow) turn it counterclockwise(will give you darker output) a little bit and check the result.
hope this helps.
keep us updated. good luck buddy!
