2-39
65/5560 ADJUSTMENT
MAY.1997 © TOSHIBA CORP.
2.10.3 Check/Adjustment of Developer Bias
If fogging occurs all over the copy despite the fact that there is no underexposure or overtoning,
rotate VR1(white) clockwise to increase the bias output.
Note:
If the bias output is raised excessively:,
•
The image contrast will deteriorate,
•
Bias leaking is liable to occur,
•
Carrier is liable to adhere to the drum, resulting in its becoming damaged.
•
Don't touch the VR (Vdc).
Remove the developer unit and cleaner unit.
Connect the + terminal of a digital tester to the connector J73 and the - COM terminal to the frame
ground. (The selected range of the degital tester must be "DC 100V" .)
(3) Follow the adjustment procedure below.
<Key Operation>
0 5
POWER
INT
(adjustment) Make sure that the voltage is 200 VDC+2V using the digital tester.
Turn VR1 if adjustment is required.
<Display, Supplementary Explanation>
40
(-) COM terminal
Frame ground
J73
Door switch bracket
Digital tester
: Enter code
VR(Vdc)
(Blue)
VR1 for developer bias
adjstment(White)
Large
Small
TEST MODE A
100%
A
X X X Y Y Y 40
ADJUST MODE
100%
Currently stored adjustment value
↓
: Selected code #
↓
↓
↓
↓
(+)terminal
: End
