Minolta Di 620 Manual page 298

Section Step
7 Are the Comb Electrode and grid mesh dirty?
Engine
8 Is the Upper Fusing Roller dirty with foreign
matter?
1 Are the Original Glass, mirrors and lens dirty
IR
with foreign matter?
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?
1155SBT050306A
6) Black Spots
Section Step
1 Is the PC Drum surface dirty with foreign mat-
ter?
2 Are the PC Drum Paper Separator Fingers
dirty with foreign matter?
Engine 3 Is the Upper Fusing Roller dirty with foreign
matter?
4 Is there caked toner in the Developing Unit?
5 Is the T/C ratio on the high side?
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
Check Item
→ ← → ←
Mem. Prn" is then
T-83
Result Action
YES Clean or change the PC
Drum Charge Corona.
Check the toner suction
mechanism for operation.
YES Clean or change the Upper
Fusing Roller.
YES Clean the Original Glass,
mirrors and lens.
YES Change PWB-B.
YES Change PWB-B.
Result Action
YES Clean or change the PC
Drum.
YES Clean or change the sepa-
rator fingers.
YES Clean or change the Fus-
ing Roller.
YES Change the developer.
YES Change the T/C ratio and
make a copy.
YES Change PWB-B.
YES Change PWB-B.