Canon iR6570 series, Service Manual

Page: 205 / 684

Chapter 7
7-7
F-7-8
In addition to standard mode and short mode, the machine also offers 30-sec mode executed for 30-sec start-up.
- 30-sec Mode
The machine executes 30-sec mode in a power save state and when it is turned on for the first time for the day.
The machine uses the value of the previous control session to initiate laser exposure, measuring the post-laser illumination potential (VLM) and
determining the developing bias DC (Vdc).
SERVICE MODE:
COPIER> OPTION> BODY> PO-CNT (turning off the potential control mechanism)
0: disable potential control
1: enable potential control (default)
COPIER> OPTION> BODY> PO-CNTMD (selecting potential control mode)
0: 10 min, 60 min potential control OFF (default)
1: 10 min, 60 min short mode
2: 10 min, 60 min normal mode
COPIER> OPTION> TEMPO> F-POT-SW
Enter '1' if a transfer separation fault occurs because of a fault in the potential sensor (as a tentative remedy until the replacement of the sensor).
COPIER> OPTION> TEMPO> F-POT-D
Enabled when '1' is set for the following: COPIER>OPTION>TEMPO>F-POT-SW.
0: if user primarily uses originals with low image ratio (text original; default)
1: if user primarily uses originals with high image ratio (photo original)
2: if re-transfer (drop-out at 50 mm of leading edge) occurs
COPIER> OPTION> TEMPO> F-HUM-SW
Enter '1' if the environment sensor is faulty (as a tentative remedy until replacement of the sensor).
COPIER> OPTION> TEMPO> F-HUM-D
Enabled if '1' is set for the following: COPIER>OPTION>TEMPO-F-HUM-SW.
Enter the humidity reading of the site of installation (between 30% and 99%; default being 35%).
COPIER> FUNCTION> DPC> DPC (forcing potential control)
ON: execute potential control
COPIER> ADJUST> V-CONT> EPOTOFST (setting potential sensor offset value)
COPIER> ADJUST> V-CONT> DE-OFST (adjusting copy Vdc)
COPIER> ADJUST> V-CONT> VD-OFST (setting copy VD target potential offset value)
COPIER> ADJUST> V-CONT> DE-OFS-P (adjusting printer Vdc)
COPIER> ADJUST> V-CONT> VD-OFS-P (setting printer VD target potential offset value)
Enter the value indicated on the service label if you have initialized the RAM on the DC controller PCB.
COPIER> FUNCTION> DPC>OFST (adjusting potential sensor offset)
For the method of adjustment, see "Standards and Adjustments."
7.4.3 Determining the Primary Current
0009-3541
To measure the dark area potential (VD) for the first time after the power switch is turned on, the machine uses the most recently measured current level,
and measures the drum surface potential using the potential sensor. The DC controller PCB compares the drum surface potential and the target potential;
as a result, if the measured potential is +/-6 V of the target value, the machine corrects the primary current and measures the potential once again. The
machine executes potential measurement a maximum of 8 times, and also corrects the primary current as many times.
Copier
potential
control
Printer
potential
control
Fixing assembly temperature
(fixing assembly warm-up complete)
Control panel power switch ON
Start key ON
Potential control
Potential control
Start key ON
10 min later to less
than 60 min
60 min later
Copier potential control
and printer potential
control during 1st job
Copier potential control
and printer potential
control during 1st job