Minolta Di 620 Manual page 303

1155SBT050313A
13) Periodically Uneven Image
Section Step
1 Are the Ds Rolls of the Developing Unit dirty
with foreign matter or scratched?
2 Are the Developing Unit drive gears cracked
or dirty with foreign matter?
3 Are the PC Drum drive gears cracked or dirty
with foreign matter, or the belt slack?
4 Is the flywheel secured in position?
5 Are the gears cracked or dirty with foreign
matter of the Transport Rollers and Synchro-
nizing Rollers?
Engine 6 Is the Suction Belt drive gear cracked or dirty
with foreign matter?
7 Are the Fusing Unit drive gears cracked or
dirty with foreign matter?
8 Is the PH Assy installed securely?
9 Is the PC Unit installed all the way into the
copier?
10 Do the bearing bushings on the PC Drum
shaft turn smoothly?
1 Are the Scanner Motor drive gears cracked or
dirty with foreign matter, or the belt slack?
2 Is the Scanner Motor secured in position?
3 Is the Scanner installed securely?
IR
4 Are the Scanner Drive Cables wound prop-
erly?
5 Are the Scanner Rails damaged or dirty 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?
Check Item
→ ← → ←
Mem. Prn" is then
T-88
Result Action
YES Clean or change the rolls.
YES Clean or change the defec-
tive gear.
YES Clean, change or adjust.
NO Secure the flywheel in
position.
YES Clean or change the defec-
tive gear.
YES Clean or change the drive
gear.
YES Clean or change the defec-
tive gear.
YES Change PWB-J or PH
Assy.
NO Install the PH Assy
securely.
NO Slide the PC Unit all the
way into the copier.
NO Change the bearing bush-
ings.
YES Clean, change or adjust.
NO Secure the motor in posi-
tion.
NO Install the Scanner
securely.
NO Wind the cables properly.
YES Clean or change the rails.
YES Change PWB-B.
YES Change PWB-B.