Minolta Di620, Manual, Page: 301 / 466

T-86
1155SBT050310A
10) Uneven Image Density
Section Step Check Item Result Action
Engine
1 Is the PC Drum grounded properly? NO Clean or change the PC
Drum ground plate.
2 Are the Comb Electrode and grid mesh dirty
or deteriorated? YES Clean or change the PC
Drum Charge Corona.
Check the toner suction
mechanism.
3 Is the Image Transfer Corona dirty or deterio-
rated? YES Clean or change the Image
Transfer Corona.
4 Is toner uniformly attracted onto the Sleeve
Roller? NO Check the Db value and
amount of developer, and
check the developer trans-
port mechanism for opera-
tion.
5 Is the paper guide shorted to the frame? NO Close the circuit properly.
6 Is the image improved by loading new paper? YES Change the copy paper
and instruct the user in
how to store paper.
IR
1 Are the Original Glass, mirrors, and lens dirty
with foreign matter? YES Clean the Original Glass,
mirrors, and lens.
2 Is the Shading Sheet dirty? YES Clean the sheet.
3 Is the Exposure Lamp dirty or deteriorated? YES Clean or change the Expo-
sure Lamp.
4 Select “Tech. Rep. Mode,” “I.R. & EDH
Check,” and “Function (I.R.),” in that order.
Does “NG” appear when “Exp. Lamp Check”
is then run? YES Change the Exposure
Lamp.
Memory
1 Select “Tech. Rep. Mode,” “Function,” and
“Image Memory,” in that order. Does “NG”
appear when “Input Image” is then run? YES Change PWB-B.
2 Select “Tech. Rep. Mode,” “Function,” and
“Image Memory,” in that order. Does “NG”
appear when “I.R. Mem. Prn” is then
run?
YES Change PWB-B.
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