Service manual

There are 20 combinations in this table. The machine chooses the
combination that is closest to the current V
DP
, and will use these values of
V
D
, V
L
, and V
B
for copying until the next process control self check. The
selected combination is based on actual image conditions, using the density
of sensor patterns on the drum, as to better maintain proper copy quality.
M/A: MASS/AREA Amount of toner per unit area on the drum (mg/cm
2
)
V
D
: Drum potential without exposure - to adjust this, the machine adjusts the
charge corona grid voltage (V
G
)
V
L
: Drum potential with the strongest exposure - to adjust this, the machine
adjusts the laser diode input current (I
LD
)
V
B
: Development bias
1.3.2 Process Control Self Check
The drum potential process control adjustments take place during the
process control self check. This self check is done at three different times.
1. Forced Process Control Self Check
When installing the machine or replacing the developer, the process
control self check must be performed (SP 3-126). The machine must be
in standby mode for 10 minutes at least before doing this.
2. Initial Process Control Self Check
After the main switch has been turned on and if the hot roller
temperature is below 100 degrees, the process control self check is done
automatically. (The setting of SP 3-125 must be kept at 0 for this to be
done automatically.)
3. Interval Process Control Self Check
If more than 150 copies have been made since the last process control
self check, after the copy job is completed.
The process control self check itself takes about 3 minutes. However, in
addition, the development unit rotates as explained in the following note,
so the total time is extended.
NOTE: Forced and Initial Process Control Self Checks:
Just before the end of the initial process control self check, the
development unit rotates 10 revolutions to supply Bk toner to the
hopper section. As a result, the total time for this self check is 4 - 5
minutes.
Interval Process Control Self Check:
The drum potential sensor calibration is omitted (see section 1.3.4).
However, just before the end of internal process control self check,
the development unit rotates 10 revolutions to supply black toner.
Therefore, this self check takes about 2 - 3 minutes.
Detailed
Section
Descriptions
PROCESS CONTROL
SM 2-5 A166/A187/A189
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA