Minolta Di 620 Manual page 301

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