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1159SBTOSO306A
6) Black Spots
PC Drum failure
\s the PC Drum surface
Clean or change the PG
1
scratched or dirty with for-
eign matter?
Drum. Change the Cleaning
Blade If necessary.
Fusing fatlure
Is the Upper Fusing Roller
dirty or scratched?
Check the Fusing Thermis-
tors. Clean or change the
Upper Fusing Roller.
's the amount of toner on
YES
Go to step 5.
the Sleeve Roller proper?
4
Is the toner-to-carrler ratio
YES
Change the toner-to-carrier
relatively high?
ratio.
Is the Developer Scattering
'3g
Clean or change the Devel-
Prevention Seal deformed
YES
' | oper Scattering Prevention
or dirty?
:
Seal.
Developing failure
1188SBT050307A
7) Blank Streaks or Bands
Is Db plugged with foreign
Remove foreign matter. If
Plugged Db
matter, caked toner, etc.?
YES | the problem persists,
change the developer.
Drum charge failure
Are the Comb Electrode
YE
and grid mesh dirty?
=
S
Clean or change the PC
Drum Charge Corona.
Image transfer fall-
Is the Image Transfer Coro-
YES
Clean or change the Image
ure
na wire dirty?
Transfer Corona.
Image Erase Lamp
Does the Image Erase
Check the Image Erase
lit at abnormal timing
Lamp light up at abnormal
YES
| Lamp.
timing?
\s the Upper Fusing Roller
YES
Clean or change the Upper
dirty or scratched?
Fusing Roller.
Are the Upper Paper Sepa-
Clean or change the Upper
rator Fingers dirty or
Paper Separator Fingers.
Fusing failure
scratched?
T-33
_ | Image transfer fail-
_ | Damp copy paper
1158SBT050308A,
8) Void Areas
[cause | Stop | ___Gheckitem _[Reeut|
Acton
Is the Image Transfer Coro-
Reinstall.
na installed properly?
is the Image Transfer Coro-
Clean or change the image
na wire dirty?
Transfer Corona wire,
Is the image improved by
Change the copy paper and
instruct the user in how to
store paper.
ure
Is toner uniformly attracted
onto the Sleeve Roller?
Small amount of ton-
er supplied
Is the paper guide shorted
to the frame?
is the Lower Fusing Roller
scratched or deformed?
Paper guide shorting
Fusing fallure
1158SBTO60309A
9) Smear on Back
[Gaus [ Step | Cheoetom
| Resut [Action]
Dirty Developing
ee 'Is the bottom part of the
Clean and check the Deve!-
through the resistor to the
frame.
Replace the Lower Fusing
Roller.
loading new paper?
Check the Db value and
amount of developer, and
check the Bucket Roller for
operation.
YES
YES
Conriect the paper guide
YES
Unit
Developing Unit dirty?
oper Scattering Prevention
Seal.
Clean the corona and
check the Developing Unit.
Clean the guide plate and
check the Developing Unit.
Dirty Image Transfer
Corona
Is the Image Transfer Coro-
Is the Pre-Image Transfer
YES
Guide Plate dirty?
Dirty Fusing Unit
Clean the guide plate and
check the Developing Unit.
Clean or change the Upper
and Lower Fusing Rollers.
Is the Fusing Unit Entrance
Guide Plate dirty?
Are the Upper and Lower
Fusing Rollers dirty?
T-34
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