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DocuColor 12/DCCS50
Process Controls
Reissue
Principles of Operation
Setup routines that run automatically
Process Controls must automatically perform setup operat
ions at frequent intervals in order to
maintain image quality. The setup routines which run automatically are one of two types,
depending on the conditions: Mini Setup or a Checkup.
Mini Setup
The Mini Setup consist of three subroutines:
1. Vh/Vm Setup
Th
is electrostatic routine is the same as DC933. This routine may result in new set values
for t
he Charge Corotron Grid Voltage (Vg) and Laser Diode power (LD) to maintain a Vh
equal to -650 volts and a Vm approximately equal to -350 volts (voltage varies with humid-
ity and Photoreceptor Drum cycles).
2. ADC P
atch
readings
This developability routine causes ADC patches to be made for each color. The patches
are measure by th
e ADC and if the values are different than the target values, the Run
time dispensing algorithm is adjusted. See Run time toner dispensing for more informa-
tion.
3. T
RC CONT 1
Checku
p
There is only one routine in the automatic Checkup routin
e. This routine is Vh/Vm Setup
described previously. This runs because the electrostatics need to be checked more often than
developability. There are three separate conditions which will cause a Checkup to run:
1. When power is switched on to the machine and t
he Fu
ser temperature is above 120°C, a
Checkup will run automatically. This condition occurs when the power has been off for a
short time and the Fuser has not had the time to cool down. A full Mini Setup is not
required for this condition.
2. A Checkup will run after a paper jam has occurred.
3. Whenever 30 minutes has elapsed since the last Checkup.
Run Mode
There are 3 routines which run while copies
are being made. Process Controls uses these rou-
tines to monitor and adjust the electrostatics and developabilit
y parameters in order to maintain
copy quality. These routines are: LD CONT, Toner Dispense Control and TRC Control.
Standby Mode
When the machine is resting in Standby, there are no setup routines running and none of the
electrost
atic or developability parameters need to be controlled. The only function Process
Controls is doing during Standby is keeping track of elapsed time. This is done to track the time
between jobs to determine if a Checkup or Mini Setup is required.
dC933 VH/VM Setup Adjusts VG/LD/BIAS to achieve the target
VH
, VM
Changes
VH/VM target to extend Develop-
ment and Photoreceptor life.
Changes ADC target by Environmental Sen-
sor (humidity)
Changes ASG Bias to keep V10% constant
dC918 IOT Highlight
Se
tu
p
Adjusts Highlight legible and in/out balance
by ASG Bias
dC923 ProCon PG Print PCON pattern (w/o LUT) and shows
ADC pat
ch values.
dC922 TRC CONT Makes a TRC LUT based on 2 ADC patches
on th
e IBT Belt. If ADC is >D60% (0.3) Tone
Up/Tone Down is required (w/o paper)
dC924 TRC Adjust Adjusts density by TRC LUT offset manually
dC939 TRC Check PG Print PCON pattern with LUT for TRC adjust-
ment
dC919 Color Balance Adjusts a center value of user color balance
m
ode (for
Digital Copier only)
Table 2 Max Setup Routines
Diag
nostic Code Description Contents
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