KONICA 1312 Service Manual ech9
Chapter 9 Troubleshooting
9-1. Defective image and diagnosis flow .........9-1
9-1-1. Both sides and trailing edge is black
when making a reduced copy ................9-1
9-1-2. Background fogging
(White background fogging) ...................9-2
9-1-3. Black lines ................................................9-3
9-1-4. Center deviation.......................................9-4
9-1-5. Smearing .................................................. 9-5
9-1-6. Light copy.................................................9-6
9-1-7. Dark copy ................................................. 9-7
9-1-8. Partial skipping of transfer .....................9-8
9-1-9. Copy is black............................................9-9
9-1-10. No image...............................................9-10
9-1-11. Distorted image.................................... 9-11
9-1-12. White band ........................................... 9-12
9-1-13. Black band............................................9-13
9-1-14. Density balance deviation...................9-14
9-1-15. Leading position deviation .................9-15
9-1-16. Contamination......................................9-16
9-1-17. Jittering.................................................9-17
9-1-18. White dots on black matte section.....9-18
9-1-19. Extremely light copy............................9-19
9-2. Operation defects ..................................... 9-20
9-2-1. Power does not turn ON........................9-20
9-2-2. Copying operation is not possible ....... 9-20
9-2-3. Paper feed or conveyance defect.........9-20
9-2-4. Abnormal noise ......................................9-21
9-2-5. Special symptoms .................................9-22
9-2-6. Malfunction.............................................9-22
9-1. Defective image and diagnosis flow
9-1-1. Both sides and trailing edge is black when making a reduced copy
Paper feeding direction
Chapter 9 Troubleshooting
START
Was copy made with platen
cover opened?
NO
Is the side erase lamp surface dirty?
NO
Is the side erase lamp lit?
NO
Is the connector disconnected?
YES
YES
YES
YES
Close the platen cover, make a copy, and reconfirm.
Clean or replace.
Check the side erase lamp
installation state.
Securely insert the connector.
NO
Control PCB defect -> Replace.
Wire harness defect -> Replace.
Side erase lanp defect -Replace.
9-1
Chapter 9 Troubleshooting
9-1-2. Background fogging (White background fogging)
Paper feeding direction
Replace or clean.
Clean.
Replace developer
material.
YES
YES
YES
START
Is the designated rating
exposure lamp installed?
Is the platen glass surface
dirty?
NO
Is the platen, glass,
mirror or lens dirty?
NO
Is the toner control correct?
NO
Was a non-designated
developer material used?
YES
Is main erase lamp lit?
YES
Is the developing bias
voltage correct?
(170±10V)
YES
Are the gaps for the drum gap
and doctor blade gap correct?
(0.6±0.05mm)
YES
Cleaning defect -> Replace.
NO
Main erase lamp defect ->
Replace.
Connector contact defect ->
Repair or replace.
Main PCB defect -> Replace.
NO
NO
High voltage PCB defect -> Replace.
Re-adjust. Replace defective
parts.
NO
Toner supply mechanism defect -> Replace corresponding part.
Toner sensor defect -> Replace.
Control circuit defect -> Replace main PCB.
Developer unit defect -> Replace.
9-2
9-1-3. Black lines
Paper feeding direction
Chapter 9 Troubleshooting
START
Is the OPC drum scratched?
NO
Is the edge of the cleaning
blade
scratched?
NO
Are there any foreign matter
contacting the OPC drum surface
before the developing process?
NO
Is there anything
(lead wire of side erase, etc.)
shielding the exposure axis?
NO
YES
YES
YES
YES
Replace.
Replace.
Correct the installation of the corresponding part, or
replace.
Correct the harness fairing.
Heat roller scratch -> Replace.
Charge wire scratch or contamination -> Replace or clean.
Grid mesh deformation or contamination -> Replace or clean.
9-3
Chapter 9 Troubleshooting
9-1-4. Center deviation
Paper feeding direction
START
Is the document set in alignment
with the platen scale?
YES
Is the platen scale installation
position correct?
YES
Paper feed cassette fixing position deviation -> Install so that the center position is
aligned. (Refer to Chapter 4)
NO
NO
Correctly set the document, and confirm.
Install so that the center position is aligned.
9-4
9-1-5. Smearing
Chapter 9 Troubleshooting
Paper feeding direction
START
Is there any part, etc., contacting
the OPC drum surface after the
developing process?
NO
Is the paper slipping during
the image transfer?
NO
Is the trailing edge of the
paper rising to the top before
fusing?
NO
Fusing defect -> Confirm the main parts
Fuser lamp, pressurized spring, heat
roller, fuse roller, etc.
If the fusing is insufficient, the image will smear
when the surface of the copied image is
rubbed.
YES
YES
YES
Correct the installation position of contacting
parts.
Confirm the drive state of the transfer roller, etc. Repair or replace the
part.
Use of paper that curls easily -> Replace the paper.
Fuser roller or heat roller defect -> Replace.
9-5
Chapter 9 Troubleshooting
9-1-6. Light copy
Paper feeding direction
START
Has the paper absorbed moisture?
NO
Is the toner density abnormally low?
NO
Has the charging or transfer
voltage dropped?
NO
Does the developer brush sufficiently
contact the OPC drum?
YES
Is the exposure voltage too high?
YES
YES
YES
YES
Replace the paper.
Inspect the toner control mechanism (Refer to 7-1) -> Adjust or replace defective part.
Inspect charge corona unit and transfer roller -> Repair or replace defective part
Confirm charging and transfer voltage -> Replace high voltage PCB.
NO
Inspect the doctor blade gap (0.6±0.05mm)-> Adjust
Inspect the drum gap -> Replace defective part.
Confirm voltage -> Re-adjust (Refer to 4-3) or replace PCB. (power supply
PCB, main PCB)
NO
Is the developing bias circuit
open?
NO
OPC drum defect -> Replace.
YES
Inspect bias circuit (170±10V)-> Repair or replace defective part.
(developing unit, high voltage PCB, etc.)
9-6
9-1-7. Dark copy
START
Chapter 9 Troubleshooting
Paper feeding direction
Has the exposure lamp’s light
amount dropped?
Is the developing bias abnormally low?
Is the toner density abnormally high?
Is the charging grid circuit open?
Inspect the lamp rating, and surface contamination -> Replace or clean.
Inspect mirror, lens and reflector for contamination -> Clean or replace.
Inspect exposure voltage -> Adjust (Refer to 4-3) or replace PCB. (power supply PCB,
main PCB)
Inspect developing bias circuit -> Repair, or replace high voltage PCB or wire
harness, etc.
Inspect the control mechanism (Refer to 4-1) -> Adjust or replace defective part.
Inspect high voltage circuit -> Repair or replace defective part.
Is the main erase lamp lit?
OPC drum defect -> Replace.
Inspect the lamp, connector and drive power -> Repair or replace defective part.
9-7
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