Oce 3121 Technical & Service Manual page 83

There is background on the copy. (overall)
Cause Step Checks
Scanner (dirty) 1
2
AGC 3
Developing unit 4
Developing unit 5
10 TSM Océ 3121
Clean the scanning lamp, the
exposure reference strip, the mir-
ror, the lens and the exposure
aperture. Is the image corrected?
Carry out the image adjustment
procedure. Is the problem cor-
rected?
Execute ' Function 15 ' in service
mode (' * 4 * '; '
SERCT_GAMMA_NUM ' ,'
AGC_MEASURE ').
Open the ' * 4 * ', ' FUNCTION
I
15 ' screen, and press the copy
button.
Check the following:
I
SERCT_GAMMA
AGC_MEASURE
_NUM
0
1 -28.1 ~ -36.5 uA
-36.6 ~ -43.0 uA
2
3
Is the variation of value too large?
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.
Replace the power supply PBA. Is
the problem solved?
Y/N Action
Yes End.
Yes End.
Yes Set ' AGS NON ' of '
~-28.0 uA
-43.1 uA ~
No
Yes End.
No
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.
Check the developing
roller and the compo-
nents adjacent to the con-
nector of the developing
unit.
Replace the DC control
PBA
Image quality