2.2.2 FORCED TONER CONSUMPTION MECHANISM
For customers that mainly make copies other than full color copies, the
toners other than the selected colors are not used. For these toners, the
amount of toner inside the development unit will gradually increase every 50
copies, since toner agitation is performed at this interval, and some toner is
added at this time (see section 6.1). If this condition continues, toner
scattering and toner density control failure may occur.
To compensate for this, along with the transport screw gear modification, the
machine checks the output of each TD sensor during the process control self
check. If the machine detects V
REF
-V
T
≥
0.3 V, it determines that there is too
much toner inside the development unit and makes a pattern across the
whole width of the drum to forcibly consume some toner.
2.2.3 FORCED TONER SUPPLY MECHANISM
When the machine makes consecutive copies that have a large portion of
solid image areas, toner supply and agitation from the toner tank cannot
keep up with the toner consumption speed, causing lighter copies, toner
scatter, and related SC codes to appear.
To compensate for this, the output of each TD sensor is checked every
copy. When the machine detects V
T
-V
REF
≥
0.5 V five times consecutively, it
determines that the amount of toner in the development unit is low. At this
moment, the copy job is interrupted, and toner is fed into the development
unit forcibly. After forced supply, the machine resumes the copy job.
A172/A199 2-8 SM
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