Oce 3121, Technical & Service Manual

Page: 83 / 908

10 TSM Océ 3121 Image quality
There is background on the copy. (overall)
Cause Step Checks Y/N Action
Scanner (dirty) 1 Clean the scanning lamp, the
exposure reference strip, the mir-
ror, the lens and the exposure
aperture. Is the image corrected? Yes End.
2 Carry out the image adjustment
procedure. Is the problem cor-
rected? Yes End.
AGC 3 Execute ‘ Function 15 ’ in service
mode (‘ * 4 * ‘; ‘
SERCT_GAMMA_NUM ‘ ,’
AGC_MEASURE ‘).
■
Open the ‘ * 4 * ‘, ‘ FUNCTION
15 ‘ screen, and press the copy
button.
■
Check the following:
Is the variation of value too large?
Yes Set ‘ AGS NON ’ of ‘
OPTION ’ ( ‘ * 5 * ‘ ) to
1.
If the resulting image is
satisfactory, keep the set-
ting to 1 as a temporary
remedy. However, be sure
to take proper action, as
there may be a problem
on the image processor
PBA or the DC control
PBA.
Developing unit 4 Is the developing roller insulated
from the earth of the machine?
Switch OFF. Disconnect J205
from the power supply PBA.
Check the electrical continuity
between J205-1 and the side of
the developing unit, and between
J205-1 and the side frame of the
machine. No Check the developing
roller and the compo-
nents adjacent to the con-
nector of the developing
unit.
Developing unit 5 Replace the power supply PBA. Is
the problem solved? Yes End.
No Replace the DC control
PBA
SERCT_GAMMA
_NUM
AGC_MEASURE
0
1
2
3
~-28.0 uA
-28.1 ~ -36.5 uA
-36.6 ~ -43.0 uA
-43.1 uA ~