Service manual

PROCESS CONTROL 30 July, 2001
6-16
6.2.6 DEVELOPER INITIALIZATION
When the machine detects that a new development unit has been installed, it
initializes the developer.
To do this, the machine agitates the developer for about 90 seconds, and adjusts
V
CNT
(control voltage for TD sensor) so that V
T
(TD sensor output) becomes 3.0 ±
0.1 volts. The machine stores this V
T
as V
REF
.
V
CNT
is corrected for the current humidity every print job. V
CNT
is also corrected for
the total number of prints, to prevent the developer Q/M from varying.
If the humidity correction is giving poor results (for example, if the humidity sensor
is broken), it can be disabled with SP2-223-2. Then a value for V
CNT
must be input
manually using SP2-224-1 to -4 (adjust by trial and error).
During developer initialization, the machine forcibly supplies toner because there is
no toner inside the toner transport tube at installation. Then the machine does the
process control self check.