FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL
98.04.24
M-34
1174SBM1101A
The ATDC Sensor installed on the underside of the Developer Mixing Chamber detects the
varying toner-to-carrier ratio of the developer which flows over it in the Chamber. The copier
CPU compares the detected ratio with the ratio set by the ATDC Detection Level Mode
(Tech. Rep. Choice C-90) to control toner replenishment.
Toner is replenished for 5 seconds (the Toner Bottle is turned one turn, which is equivalent
to a run of 2 copy cycles) for each Toner Replenishing signal.
If the toner-to-carrier ratio becomes lower than 3.5% in a toner-empty condition, the copier
inhibits the initiation of a new copy cycle (this feature can be enabled or disabled by a Tech.
Rep. Choice mode). When a ratio of 4% or more is recovered as a result of Auxiliary Toner
Replenishing, the copier permits the initiation of a new copy cycle.
If the Front Door is swung open and closed with a T/C ratio of less than 4%, the copier ini-
tiates an Auxiliary Toner Replenishing sequence. (It stops the sequence as soon as a T/C
ratio of 4.5% is reached.)
ATDC Sensor Automatic Adjustment
An automatic adjustment of the ATDC Sensor is made in the F8 Test Mode operation and
when a new Imaging Unit is installed in the copier.
✽ When a New Imaging Unit is Installed in the Copier:
Following the execution of the starter setup mode upon power-up, the copier CPU reads the
output value of the ATDC Sensor and establishes the reading as the reference value.
✽ When F8 is Run after Starter Has Been Changed:
Following the execution of the starter setup mode upon pressing of the Start Key, the copier
CPU reads the output value of the ATDC Sensor and establishes the reading as the refer-
ence value.
NOTE
If an F8 operation is run at a time when the starter has not been changed, it can result in a
wrong T/C reference value being set by the copier. Avoid casual use of F8.
If the setting value has been cleared because of the RAM Board being replaced, however,
enter the ATDC control value before the replacement using the Zoom Up/Down Keys in the
F8 operation (without pressing the Start Key).
11-1. ATDC Sensor
Set T/C (%) ATDC Output Voltage (V)
6.0 2.5 (Standard)
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