Minolta Di 620 Manual page 302

1155SBT050311A
11) Gradation Reproduction Failure
Section Step
1 Is the Shading Sheet dirty?
2 Is the image improved by loading new paper?
3 Is the gradation unclear in the high-density
areas?
4 Is the gradation unclear in the low-density
areas?
5 Are the PJs and connectors plugged securely
into PWB-B and PWB-J?
1155SBT050312A
12) Rough Image
Section Step
1 Has the developer PM counter reached near
40K?
2 Are the Developing Unit and Db plugged with
foreign matter or caked toner?
3 Is the Db gap correct as adjusted?
Engine
4 Is the Image Transfer Corona wire dirty or
deteriorated?
5 Is the wiring between Image Transfer/Paper
Separator HV HV2 and the Image Transfer
Corona normal?
Check Item
Check Item
T-87
Result Action
YES Clean the sheet.
YES Change the copy paper
and instruct the user in
how to store paper.
YES Decrease the value for "γ
Table" available under
"Printer" selected from
"Tech. Rep. Choice" of
"Tech. Rep. Mode."
YES Increase the value for "γ
Table" available under
"Printer" selected from
"Tech. Rep. Choice" of
"Tech. Rep. Mode."
YES Change PWB-B or PWB-J.
NO Plug them in securely.
Result Action
YES Change the developer.
YES Remove foreign matter
and caked toner. If the
problem recurs, change
the developer.
NO Readjust by referring to
DIS/REASSEMBLY,
ADJUSTMENT.
YES Clean or change the wire.
YES Change HV2.
NO Correct the wiring.