
4-49
Confidential
4.2.5 Problems Encountered Frequently in the Past
This section lists the four problems most frequently encountered during on-site service in the
past.
- Paper jams
- Error message "MACHINE ERROR 4F"
- Ink-related problems
- Auto document feeder (ADF) failure
[ 1 ] Paper jams
A paper jam may occur not only due to machine malfunction but also to the user's actions.
NOTE:
In some cases, foreign material that has found its way into the machine without the user
realizing can be the cause of a paper jam. Instruct the user to place nothing on top of the
machine that might fall into it.
NOTE:
When removing foreign materials from the machine, take special care not to
contaminate or scratch the CR encoder strip. If the encoder strip is contaminated or scratched,
replace it. (Refer to
NOTE:
After removing jammed paper from the machine, be sure to check that no fragment of
paper remains in the machine.
Problems due to the user's actions
Problems due to machine malfunction
Check
Possible causes
Problems that may result
Recording paper
Paper not suited to use with the machine
was used.
Paper with labels attached, for
example, may leave labels inside
the machine.
For foreign materials
Fragments of paper that were left behind
when previous paper jams occurred.
Foreign materials such as tacks have
found their way into the machine.
Foreign materials can hinder the
paper feed.
Check
Possible causes
Problems that may result
Flap of DX paper tray
#1 (for duplex print
models)
Flap of DX paper tray #1 is not working
or is broken.
The broken flap catches the
switchbacked paper, hindering the
paper feed.
Star wheels on star
wheel support
Star wheels became dislocated when
paper jam occurred.
Dislocated star wheels can hinder
paper feed.
Sensors and actuators
Any sensor(s) not working.
If a sensor does not turn on, the
related roller(s) will not rotate.
Bank ASSY
(LT bank ASSY)
The bank ASSY (LT bank ASSY) is
deformed.
A deformed section on the bank
ASSY (LT bank ASSY) can cause
double-feeding.
CR encoder strip
The CR encoder strip is stained.
A stained CR encoder strip can
cause a carriage drive error during
printing that will stop the printing
operation.
Bank ASSY
Paper tray
Summary of Contents for DCP-6690CW
Page 7: ...v Confidential SAFETY PRECAUTIONS Symbols used in the documentation ...
Page 8: ...vi Confidential ...
Page 9: ...vii Confidential ...
Page 10: ...viii Confidential ...
Page 11: ...ix Confidential ...
Page 12: ...x Confidential ...
Page 13: ...xi Confidential ...
Page 14: ...Confidential CHAPTER 1 PARTS NAMES AND FUNCTIONS ...
Page 18: ...1 3 Confidential 1 2 CONTROL PANEL DCP6690CW 5 6 4 1 2 3 ...
Page 19: ...1 4 Confidential ...
Page 20: ...1 5 Confidential MFC6490CW 10 9 7 8 6 1 2 3 4 5 ...
Page 21: ...1 6 Confidential ...
Page 22: ...1 7 Confidential ...
Page 23: ...1 8 Confidential MFC6890CDW 8 7 6 1 2 3 4 5 ...
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Page 28: ...Confidential CHAPTER 2 SPECIFICATIONS ...
Page 35: ...2 6 Confidential 2 2 SPECIFICATIONS LIST DCP6690CW MFC6490CW 1 8 ...
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Page 43: ...2 14 Confidential MFC6890CDW 1 10 ...
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Page 53: ...Confidential CHAPTER 3 THEORY OF OPERATION ...
Page 110: ...Confidential CHAPTER 4 ERROR INDICATION AND TROUBLESHOOTING ...
Page 114: ...4 2 Confidential 1 Error messages appearing on the LCD ...
Page 115: ...4 3 Confidential For MFC only ...
Page 116: ...4 4 Confidential For MFC only ...
Page 117: ...4 5 Confidential For MFC only ...
Page 118: ...4 6 Confidential ...
Page 119: ...4 7 Confidential ...
Page 172: ...Confidential CHAPTER 5 HANDLING DATA HELD IN THE MACHINE PRIOR TO REPAIR ...
Page 179: ...Confidential CHAPTER 6 DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 292: ...Confidential CHAPTER 7 ADJUSTMENTS AND UPDATING OF SETTINGS REQUIRED AFTER PARTS REPLACEMENT ...
Page 299: ...7 5 Confidential 8 Alert warning message of WHQL appears Click Continue Anyway to proceed ...
Page 308: ...7 14 Confidential Head Positioning Test Pattern ...
Page 314: ...7 20 Confidential Paper Feeding Check Pattern for the Paper Ejection Roller ...
Page 315: ...7 21 Confidential Paper Feeding Check Pattern for the Paper Feed Roller Paper Tray 2 ...
Page 317: ...7 23 Confidential Vertical Alignment Check Patterns 2 2 ...
Page 321: ...7 27 Confidential Left and Right Margin Check Pattern ...
Page 322: ...7 28 Confidential Bottom Margin Check Pattern ...
Page 333: ...7 39 Confidential ADF Copy Chart A B C D ...
Page 337: ...Confidential CHAPTER 8 CLEANING ...
Page 341: ...8 3 Confidential Maintenance unit Head caps Head wiper cleaning_BHM9_E Rubycel stick ...
Page 344: ...Confidential CHAPTER 9 MAINTENANCE MODE ...
Page 353: ...9 7 Confidential Scanning Compensation Data List ...
Page 356: ...9 10 Confidential Test Pattern ...
Page 361: ...9 15 Confidential Configuration List ...
Page 379: ...9 33 Confidential Paper Feeding Check Pattern for the Paper Ejection Roller ...
Page 380: ...9 34 Confidential Paper Feeding Check Pattern for the Paper Feed Roller Paper Tray 2 ...
Page 384: ...9 38 Confidential Vertical Alignment Check Patterns 1 2 ...
Page 385: ...9 39 Confidential Vertical Alignment Check Patterns 2 2 ...
Page 389: ...9 43 Confidential Left and Right Margin Check Pattern ...
Page 390: ...9 44 Confidential Bottom Margin Check Pattern ...
Page 421: ...App 2 3 Confidential 8 Alert warning message of WHQL appears Click Continue Anyway to proceed ...
Page 502: ...App 6 4 Confidential B Power supply PCB 100 V series ...
Page 503: ...App 6 5 Confidential B Power supply PCB 200 V series ...