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Toner Cartridge / Hopper Main Unit Theory of Operation
2-20
II Composition/Operation
C. Toner Supply Motor control
• The Toner Supply Motor control is carried out when all of the following conditions are met
while the Developing Motor turns evenly.
1. The toner level sensor output value indicates that toner replenishing for the Developing
Unit is required.
2. The Toner Supply Motor has not been energized for a predetermined period of time or
more after the condition, in which the Developing Unit needs toner to be replenished,
has been established.
3. A predetermined period of time elapses after the Toner Supply Motor has been ener-
gized for a predetermined period of time or more after the condition, in which the Devel-
oping Unit needs toner to be replenished, was established.
D. Toner Supply Motor control start timing (1)
• The Toner Supply Motor starts turning when all of the following conditions are met:
1. The Developing Motor turns evenly.
2. The toner level sensor output value indicates that toner replenishing for the Developing
Unit is required.
3. A predetermined period of time elapses after the Toner Supply Motor has been ener-
gized for a predetermined period of time or more after the condition, in which the Devel-
oping Unit needs toner to be replenished, was established.
E. Toner Supply Motor control start timing (2)
• The Toner Supply Motor starts turning when all of the following conditions are met:
1. The Developing Motor turns evenly.
2. The Toner Supply Motor has not turned for a predetermined period of time during the
last toner replenishing sequence.
F. Toner Supply Motor starting timing control
• Since a single Toner Supply Motor is turned forward or backward to replenish the supply
of either one of two colors of toner, M (K) toner cannot be supplied while Y (C) toner is
being supplied.
• Control is provided to assign a uniform replenishing timing, thereby ensuring that the four
colors of toner are supplied evenly.
1. A replenishing sequence is started when it becomes necessary to replenish the supply
of Y/C toner (M/K toner).
2. The supply of Y/C toner is replenished for a predetermined period of time. If there is a
request for replenishing the supply of M/K toner thereafter, a replenishing sequence is
started again.
Note, however, that the new replenishing sequence can be started only after the lapse
of a predetermined period of time after the supply of Y/C toner (M/K toner) has been
replenished. If another request is made for replenishing the supply of Y/C toner (M/K
toner) after the lapse of this predetermined period of time, and if there is no request for
replenishing the supply of M/K toner (Y/C toner), the supply of Y/C toner (M/K toner) is
replenished again.
3. If the other Toner Supply Motor is being started when a toner replenishing sequence
using one Toner Supply Motor is to be started, this replenishing sequence is not
started. The sequence is started only after rotation of the other Toner Supply Motor has
become stable.
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