14-1.Atdc Sensor; Atdc Sensor - Minolta EP3010 Manual

1173SBM1401A

14-1. ATDC Sensor

The copier compares the toner-to-carrier ratio (T/C) of the developer in the Developer Mix-
ing Chamber detected by ATDC Sensor during a copy cycle with the reference ratio (6%)
and, if it finds a lower ratio than the reference, replenishes the supply of toner.
The standard output voltage of the ATDC Sensor for the reference T/C (6%) is 2.5V.
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 3.25% 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). As soon as a ratio of 4% or more is recovered, 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. (The toner-empty condition is canceled
as soon as a T/C ratio of 4.5% is reached and the copier completes the Auxiliary Toner
Replenishing sequence when the target level is reached.)
ATDC Sensor Automatic Adjustment
An automatic adjustment of the ATDC Sensor is made in the F8 or FF Test Mode operation.
When F8 (or FF) is Run after Starter Has Been Changed:
Following the execution of the starter setup mode upon pressing the Start Key, the copier
CPU reads the output value of the ATDC Sensor and adjusts the ATDC Sensor gain so that
the output value becomes 2.5V.
NOTE:
If an F8 (or FF) 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 the RAM Board being replaced, use the
"Level History" function of the Tech. Rep. mode to return the "ATDC Ref. Value" to the origi-
nal value before the board was replaced.
M-39