Interleaf EP5000/EP4000 GENERAL, MECHANICAL/ELECTRICAL
97.04.01
M-43
<Toner Replenishing Control by ATDC Sensor>
The ATDC Sensor samples T/C for each copy and the copier compares the reading with
the reference T/C (which is normally 6% but may 7% depending on the image
stabilization control provided), energizing Sub Hopper Toner Replenishing Motor M9 as
may be necessary to replenish toner in either of the following four modes.
Toner Replenishing Mode Conditions Amount Replen-
ished *
Large amount replenishing The ATDC Sensor reading is lower than
reference T/C by 0.5% or more.
Approx. 133 mg
Small amount replenishing The ATDC Sensor reading is lower than
reference T/C by less than 0.5%.
Approx. 66 mg
Fixed amount replenishing The ATDC Sensor reading is higher than
reference T/C by less than 1%.
Approx. 13mg
No toner replenishing The ATDC Sensor reading is higher than
reference T/C by 1% or more.
* The amount of toner replenished varies according to the paper size (given in the table
are figures for A4). The copier is also provided with a function that, if T/C detected
during a copy cycle is lower than the reference by 2% or more, interrupts the copy
cycle and performs a toner replenishing sequence and, as soon as there is a gain of
1% against the T/C reading, resumes the copy cycle. This function is, however, dis-
abled when a toner-empty condition is detected and the ATDC Sensor is found faulty.
<Toner Replenishing Control by AIDC Sensor>
This copier is equipped with a function that switches from the ATDC Sensor, if it becomes
defective, to the AIDC Sensor to continue providing the toner replenishing control. A
pattern is produced on the surface of the PC Drum for each copy between two
successive copies or after it has been fed out. The AIDC Sensor reads that pattern to
detect the amount of toner sticking to it and the copier performs either of the following
toner replenishing sequences depending on the output voltage of the AIDC Sensor.
(Controlled target T/C: 6%; AIDC Sensor output voltage: DC4.25V)
Toner Replenishing Mode AIDC Sensor Output Volt-
age
Amount Replenished *
Large amount replenishing Less than DC3.25V Approx. 129 mg
Small amount replenishing DC3.25V to less than 4.25V Approx. 64 mg
Fixed amount replenishing DC4.25V to less than 5.25V Approx. 13 mg
No toner replenishing DC5.25V or more
* The amount of toner replenished varies according to the paper size (given in the table
are figures for A4).
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