Minolta Di 620 Manual page 299

1155SBT050307A
7) Blank Streaks or Bands
Section Step
1 Is the PC Drum surface scratched or dirty?
2 Are the PC Drum Paper Separator Fingers
dirty or deformed?
3 Are the Comb Electrode and grid mesh dirty?
4 Is the Drum Charge Corona Wire Cleaner at
the home position?
5 Is the Image Transfer Corona wire dirty?
Engine
6 Is the Image Transfer Corona Wire Cleaner at
the home position?
7 Is the Upper Fusing Roller dirty or scratched?
8 Are the Upper Paper Separator Fingers dirty
or scratched?
9 Is the Db plugged with caked toner or foreign
matter?
10 Is the window on the underside of the PH
dirty?
11 Is the light path between PH to PC Drum dirty
with dust?
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?
1155SBT050308A
8) Void Areas
Section Step
1 Is the image improved by loading new paper?
2 Is toner uniformly attracted onto the Sleeve
Roller?
Engine
3 Is the image improved by turning the Paper
Separator Corona Output Fine Adjustment
Switches in the direction of a smaller setting?
(See SWITCHES ON PWBs, TECH. REP.
SETTINGS.)
Check Item
→ ← → ←
Mem. Prn" is then
Check Item
T-84
Result Action
YES Clean or change the PC
Drum.
YES Clean or change the sepa-
rator fingers.
YES Clean or change the PC
Drum Charge Corona.
Check the toner suction
mechanism for operation.
NO Check the corona wire
cleaning mechanism.
YES Clean or change the Image
Transfer Corona.
NO Check the corona wire
cleaning mechanism.
YES Clean or change the Upper
Fusing Roller.
YES Clean or change the Upper
Paper Separator Fingers.
YES Remove foreign matter.
Change the developer.
YES Clean the window.
YES Remove the dust.
YES Change PWB-B.
YES Change PWB-B.
Result Action
YES Change the copy paper
and instruct the user in
how to store paper.
NO Check the Db value and
amount of developer, and
check the developer trans-
port mechanism for opera-
tion.
NO Clean or change the Paper
Separator Corona wire.