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
Chapter 9 Troubleshooting
9-1-8. Partial skipping of transfer
Paper feeding direction
START
Has the paper absorbed moisture?
NO
Is the developer brush
poor?
NO
Is the developer brush position
correct?
YES
Is the toner density correct?
YES
YES
NO
NO
Replace the paper.
Insufficient developer material -> Replace.
Foreign matter in developer material -> Remove or replace.
Developer unit defect -> Repair or replace.
Adjust the developer brush height.
Inspect the toner density control and mechanism -> Re-adjust
or replace defective part.
YES
Inspect charging process -> Repair or replace defective part
OPC drum defect -> Replace.
9-8
9-1-9. Copy is black
Chapter 9 Troubleshooting
START
Is the exposure lamp lit?
NO
Is the voltage applied on the
exposure lamp?
NO
Temperature fuse blown -> Replace.
AVR circuit defect -> Replace PCB.
Control signal defect -> Main PCB defect.
Wire harness, CN defect -> Repair or replace.
YES
YES
Mirror or lens installation defect or deviation -> Repair.
Lamp wire breakage -> Replace.
9-9
Chapter 9 Troubleshooting
9-1-10. No image
START
Is the document set?
Is the charge corona unit set?
Are the OPC drum and developer’s
MG roller rotating?
Is the developer brush correct and
contacting the OPC drum?
Set the document.
Accurately set.
Inspect the drive mechanism-> Repair or replace
defective parts.
Inspect -> Repair or replace defective parts.
High voltage is not applied on charge corona unit or transfer roller -> Replace
defective parts. (PCB, wire harness, etc.)
9-10
9-1-11. Distorted image
Paper feeding direction
Chapter 9 Troubleshooting
START
Is the distortion caused by the
beam axis deviation?
Paper is
oblique.
Is image distorted during
manual feed copying?
Is image distorted
during image transfer?
Is image distorted after paper
trailing end separates from resist
roller?
Reference: To check whether the paper is oblique, make a dark reduced copy of the section where
there is white base, and check the side erase section’s linearity.
Beam axis deviation -> Adjust the mirror height and parallelism.
(Refer to 4-6)
Inspect the cassette mounting state, corner claw, paper feed roller, and
pressure balance, etc. -> Repair or replace defective parts.
Resist roller or intermediate roller oblique (inspect thrust play,
pressurizing balance) -> Repair or replace defective parts.
Fusing roller oblique (inspect fusing unit installation position,
pressurized spring balance, etc.) -> Repair or replace defective
parts.
Others: Catching of paper in conveyance path (inspect paper guide, etc.) ->
Repair or replace defective parts.
9-11
Chapter 9 Troubleshooting
9-1-12. White band
Paper feeding direction
START
Does the white band occur
in the paper feeding
direction?
NO
(Crosswise direction)
Does the developer’s MG roller
rotation stop sometimes?
NO
Is charge corona unit or
transfer roller contact
defective?
NO
Is there a contact defect sometimes
in the developer’s bias circuit?
NO
OPC drum defect -> Replace.
(Paper feeding direction)
YES
YES
Inspect drive mechanism ->
Repair or replace defective parts.
YES
Inspect high voltage circuit ->
Repair or replace defective parts.
YES
Is any foreign matter adhered
on charge corona unit?
NO
Is part of the side
erase lamp lit?
NO
I
s the developer brush
even?
NO
YES
YES
YES
Clean or replace.
Inspect lighting control circuit
-> Replace defective parts.
Remove the foreign matter or
replace developer material.
9-12
9-1-13. Black band
START
Chapter 9 Troubleshooting
Paper feeding direction
Does the black band occur
in the paper feeding?
NO
(Crosswise direction)
Is there a cleaning defect?
NO
Is the developer’s bias
contact defective?
NO
Is the platen glass dirty?
(Black band always
occurs at same place)
NO
(Paper feeding direction)
YES
YES
YES
Replace the cleaning blade.
Inspect bias circuit (170±10V)-> Repair or
replace defective parts.
YES
NO
Clean.
Is there filming on the OPC
drum?
Is the lens or mirror dirty?
NO
Is the charge corona unit’s
grid mesh dirty?
NO
Is the exposure lamp or
main erase lamp partially
dirty?
NO
Is the cleaning blade’s edge
partially defective?
YES
YES
YES
YES
Clean.
Clean.
Clean.
Replace.
OPC drum grounding contact defect ->
Repair OPC drum defect -> Replace.
YES
Clean with alcohol (IPA), and dry.
9-13
NO
Is the heat roller
surface scratched?
NO
YES
Clean.
Chapter 9 Troubleshooting
9-1-14. Density balance deviation
Paper feeding direction
START
Does the density balance
deviation occur in the paper
feeding direction?
(Crosswise direction)
NO
Is the balance deviated
even with a black matte
copy?
YES
Is the gap between the
charging grid mesh and OPC
drum even?
YES
Is the developer brush even?
YES
(Paper feeding direction)
YES
NO
NO
NO
Inspect the grid mesh fixing state ->
Repair or replace.
Adjust the doctor blade.(0.6±0.05mm)
A
Is the lens, mirror, reflector or
exposure lamp dirty?
NO
Light distribution adjustment defect -> Adjust the No. 1 scanner light
distribution adjustment plate. (Refer to 4-6)
YES
Clean.
Is the gap between the drum
and MG roller even?
YES
Other causes:
OPC drum defect -> Replace.
Paper moisture absorption -> Replace.
Developer defect -> Replace.
NO
Repair or replace defective parts.
A
9-14
9-1-15. Leading position deviation
Paper feeding direction
START
Chapter 9 Troubleshooting
Is the position always deviated
by the same amount?
Is the regist clutch operation
defective?
The amount of paper fed into the regist roller is unstable, so inspect
the paper feed and conveyance roller operation state -> Repair or
replace defective parts.
Re-adjust with the leading edge position adjustment . (Refer to
4-4)
Repair or replace the regist clutch.
9-15
Chapter 9 Troubleshooting
9-1-16. Contamination
Paper feeding direction
START
Is the image periphery smeared and
dirty?
NO
Does the contamination seem
as though toner has spilled?
NO
1
Other cause
(Platen contamination, use of differing brands of
developer material, etc.)
Is back side of paper dirty?
NO
YES
YES
YES
Paper slipping during transfer -> Inspect the transfer process
Fusing defect -> Inspect the fusing temperature, pressure and heat
roller surface, etc.
Spilling of toner from developer -> Inspect developer rotation state,
and clean.
1
The pressure (rubber) roller is dirty -> Clean.
More than 50 copy papers on the paper exit
tray -> Eliminate the copy papers
MODEL
1312
MANUAL
SERVICE HANDBOOK
REVISED EDITION
9-16
1
DATA
May.1999
PAGE
9-16
METHOD
REPLACEMENT
9-1-17. Jittering
Chapter 9 Troubleshooting
Paper feeding direction
START
Does the jittering occur with the
image (before transfer) on the OPC
drum?
YES
Is the OPC drum rotation smooth?
YES
Inspect the scanner drive mechanism.
NO
NO
Inspect the paper feed conveyance mechanism.
Inspect the main drive, developing drive and drum drive
mechanism.
9-17
Chapter 9 Troubleshooting
9-1-18. White dots on black matte section
START
Has the paper absorbed
moisture?
NO
Is the paper curled or wrinkled?
NO
Is there dew condensation or
filming on the OPC drum
surface?
NO
Is the transfer roller dirty?
Has the transfer voltage dropped?
YES
YES
YES
YES
Replace the paper, and confirm.
Replace the paper, and confirm.
Wipe off the filming with alcohol (IPA), completely dry the OPC
drum surface, and then reconfirm.
Inspect the transfer roller and application voltage -> Clean or replace
defective parts.
NO
OPC drum defect -> Replace.
9-18
9-1-19. Extremely light copy
START
Chapter 9 Troubleshooting
Does almost none of the
image on the OPC drum
appear?
YES
Is the exposure lamp voltage
abnormally high?
NO
Is the developer’s MG roller
rotating?
YES
Other causes
Use of differing brands of developer
material, etc.
NO
YES
NO
Inspect the transfer roller -> Repair or replace defective parts
Inspect the AVR circuit -> Repair or replace defective parts.
NO
Inspect the drive mechanism -> Repair or replace defective parts.
9-19
Chapter 9 Troubleshooting
9-2. Operation defects
9-2-1. Power does not turn ON
Symptom
* The power is not supplied to the power supply
PCB.
The power is supplied to the power supply PCB.
* Power (+5V) is supplied to the main PCB.
* The fusing heater is correct controlled, but
nothing displays.
9-2-2. Copying operation is not possible
Symptom
* Key operations are not accepted
Estimated cause
* Power plug contact defect, or
wire breakage
* The main breaker of the
power socket is shut off.
* Fuse is blown
* The power PCB is defective
* Main PCB defect
* Operation PCB connector
contact defect, or operation
PCB defect
Estimated cause
* The operation key is pressed
down
* The connector connection is
incomplete
* The operation PCB is defective
Remedy
* Repair or replace
* Turn the breaker ON.
* Replace
* Replace
* Replace
* Repair the connector, or
replace the defective parts
Remedy
* Repair or replace the ornament
* Securely connect
* Replace
* P** error displays
* F** error displays
* J** error displays
9-2-3. Paper feed or conveyance defect
Symptom
* Paper is not fed (Incorrect feeding)
* Several sheets are feed at once (overlapping
supply)
* The paper is fed at an inclination
* Consumable unit is not
mounted or not set
* Service call error
Paper jam detection
Estimated cause
* Paper feed roller surface
contamination
* Use of non-designated paper
* Use of curled paper
* Use of paper that has absorbed moisture
* The paper was replenished
without separation
* The cassette's spring pressure is too high
* The cassette fixing position is
deviated
* The paper feed roller's
conveyance force is unbalanced
* Refer to 8-1
* Refer to 8-1
* Refer to 8-1,8-3-4
Remedy
* Clean or replace
* Replace with designated paper
* Replace
* Replace
* Loosen the paper well
* Inspect the spring -> Repair
or replace
* Adjust (Refer to 4-4)
* Repair or replace defective
parts
* Corners are folded after feda
* Corner claw catching force is
high
9-20
* Repair or replace
Chapter 9 Troubleshooting
Symptom
* The paper is fed, but it does not reach the resist
roller
* The paper reaches the resist roller, but jams
* The paper jams or is oblique up to the fusing
process
* Paper jams at heat roller
Estimated cause
* The intermediate roller feed is
defective
* JAM1 sensor detection defect
* The paper feed or intermediate roller does not stop
*Use of curled paper
* Catching on paper guide
* Resist roller pressure
unbalance (Spring dislocation,
etc.)
* The separation claw does not
contact the roller (Spring
dislocation, etc.)
* Roller surface contamination
* The fuser roller is not rotating
(metal burning, etc.)
Remedy
*
Inspect the drive mechanism ->
Repair or replace defective parts
* Inspect the sensor operation
(Refer to 8-3-4) -> Repair or
replace
*
Inspect the clutch operation ->
Repair or replace defective parts
* Replace
* Inspect -> Repair or replace
defective parts
* Adjust, install spring again
* Inspect, install spring again
* Clean or replace
* Oil or replace defective parts
* The paper is fed slightly from the fusing roller,
and jams on the tray side, or JAM is displayed
when paper has been completely exited to the
tray.
* The paper exited to the tray is wrinkled or curled
9-2-4. Abnormal noise
Symptom
* A high pitch metallic noise is generated periodically
* JAM2 sensor detection defect
* Mounting of very curled paper,
moist paper, non-designated
paper, etc., in cassette
* Fusing pressure unbalance
Estimated cause
* Metal burning noise
* OPC drum resonance
* Recycle screw drive noise
* Inspect sensor operation
(Refer to 8-3-4) -> Repair or
replace
* Replace paper
* Inspect -> Repair or replace
Remedy
* Inspect corresponding place
-> Oil or replace defective part
(Note: Do not apply oil on the
photosensitive surface)
* Clean or replace
* Abnormal noise generated in synchronization
with main motor rotation
* Abnormal noise in OPC drum
drive system
9-21
* Inspect corresponding place > Repair
(Note: Do not apply oil on the
photosensitive surface)
Chapter 9 Troubleshooting
Symptom
* Abnormal noise generated in synchronization
with main motor rotation
* Abnormal noise generated in synchronization
with exposure process
* Abnormal noise generated when magnification
ratio is changed
* Lens motor stepping-out noise
Reference: The place where the abnormal noise is coming from can be pinpointed easily by separating the drive system
into drive blocks and confirming the operation. Note that the symptom may not appear unless there is a normal load.
Estimated cause
* Abnormal noise in developing
drive system
* Abnormal noise in fusing
drive system
* Abnormal noise in scanner
drive system
* Abnormal noise in zoom lens
drive system
* Lens motor stepping-out
noise
* Oil or replace defective part
* Oil or replace defective part
* Inspect corresponding place
-> Repair, oil or replace
defective part
* Inspect corresponding place
-> Repair, oil or replace
defective part
Remedy
9-2-5. Special symptoms
Symptom
* Image is out of focus when the magnification ratio changed.
* Paper size error is happen.
Estimated cause
* Lens drive error
* 4-5 mirror drive error
* JAM1 sensor operation
defect
* Inspect drive mechanism ->
Repair, oil or replace defective
parts
* Repair or replace (Refer to 83-4)
Remedy
* Out of focus
* Out of focus partly
9-2-6. Malfunction
Symptom
* Display LEDs flicker.
* Main motor starts moving suddenly
* Power turns OFF when Copy button is pressed
* Mirror or lens positional
deviation
* OPC drum defect (dew
condensation, filming)
Estimated cause
* High voltage leak
* Power supply PCB defect
(unstable voltage)
* Obstructive noise
* Catching of JAM1 sensor
actuator
* Obstructive noise
* Power voltage is too low.
* 24V system electronic part
or PCB is short circuited.
* Inspect -> Repair or replace
defective parts
* Inspect -> Clean with alcohol
(IPA), or replace
Remedy
* Inspect -> Repair or replace
defective parts
* Inspect -> Replace
* Inspect -> Remove cause
* Repair
* Inspect -> Remove cause
* Change supply power
* Inspect -> Repair or replace
defective part
9-22
Chapter 9 Troubleshooting
Symptom
* Returns to default state during copying
(Jams when there is still appear inside.)
Note: Obstructive noise includes internal noise and external noise. The internal noise includes noise from the high
voltage circuit system, static electricity noise and power noise. Thus, confirm whether there are any leaks or
grounding defects. The external noise includes nose that enters on the power supply line, and obstructive wave
noise that enters through the air. If there are any devices that are noise sources near the unit, the unit could be
affected.
Estimated cause
* High voltage leak
* Power voltage is too low
* Obstructive noise
Remedy
* Inspect -> Repair or replace
defective part
* Change supply power
* Inspect -> Remove cause
9-23
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