8)',2-'%0#7)6:-')#&900)8-2
&900)8-2#291&)6U####%*-'-3#IENJfIFNJ#g#NNI NIfNJfMK
%440-'%&0)#13()0U#%*-'-3#IENJfIFNJ
SUBJECT: FIREFLIES
SYMPTOM:
In solid areas, small circular void areas occur, sometimes accompanied by a small dot of toner and/or carrier
in the center.
CAUSE:
There are two causes, fireflies caused by weak carrier particles and fireflies caused by soft toner blocks
(see illustrations below).
SOLUTION:
1. FIREFLIES CAUSED BY CARRIER - Some carrier particles may have weak charge characteristics,
making them more likely to be transferred to the drum.
NOTE:
Weak carrier particles can exist in new or used developer
The following procedure adjusts the Development Bias and Charge Grid to remove weak carrier particles
from the development unit:
1. Enter SP Mode, select <2> SP Test page 1 and enter 255 for the Test Pattern Level.
2. Press The Next Key to turn to page 2 and select the Full Dot Test Pattern.
3. Enter "Copy in SP Mode".
4. Produce a Full Dot Test Pattern for each toner color (CMYK) on 11 X 17 inch paper to determine which
color(s) has the firefly problem.
5. Go back into SP mode.
Continued...
'97831)6#7)6:-')#+6394
‰
MECHANICAL
‰
PAPER PATH
‰
ELECTRICAL
‰
OTHER
Note:
This copy intended as master of original
for reproduction of additional bulletins.
‰
S M
„
COPY QUALITY
‰
PARTS
Carrier type Firefly
Toner type Firefly
May or may not have
a particle of carrier in
the center.
To Next Page
Loading...
