Canon C2050, Service Handbook

Page: 203 / 292

SERVICE MODE
S-61
COPIER>ADJUST
<HV-PRI>
Use it to adjust the injection charging assembly high voltage.
INJ-Y/M/C/K
Use it to adjust the injection AC bias.
If fogging occurs in the white background of an output (and if the fogging
still occurs when the setting of DENS-Y/M/C/K is correct and toner dis-
charge is forced in service mode), use it to adjust the injection AC bias.
Settings -2 to +2 (whole number)
Default 0
A higher setting increases the AC peak-to-peak voltage and, as a result, fog-
ging/ghosting will be reduced.
SUB-Y/M/C/K
Use it to adjust the auxiliary charging bias.
Use it to adjust the auxiliary bias if ghosting occurs.
Settings -2 to +2 (whole number)
Default 0
A higher setting increases the auxiliary charging bias (DC); as a result,
ghosting will be reduced.
SUB-Y/M/C/K-NI
Use it to adjust the auxiliary charging bias (non-image area).
Over time, toner tends to collect inside the injection changing assembly,
causing fogging. To prevent the problem, the auxiliary charging bias (non-
image area) may be adjusted using this mode item.
Settings -2 to +2 (whole number)
Default 0
A higher setting increases the auxiliary charging bias in discharge sequence
during last rotation and between sheets; as a result, discharge of toner from
the injection charging assembly is promoted.