Problems Related To Print Quality (Part 001/2) - Fujitsu DL7600 Maintenance Manual

3.1.4 Problems related to print quality (part 001/2)

1 A dot is missing or an excess dot is printed.
(See other items about blurring of the top or bottom
of a character.)
2 The printing position in the horizontal direction
(character spacing direction ) is misaligned.
Check first that:
- Paper thickness is adjusted properly.
- The automatic paper thickness control
mechanism works normally.
3 Printing smears paper.
4 Printing is light or the top or bottom of characters is
blurred.
Symptom
Multipart paper or thick
paper is used.
Paper is smeared by the
ribbon. (Haze)
There is a blotch of ink.
Cause
The print head is
defective.
The carriage cable is
connected improperly.
The carriage cable is
defective.
The control board is
defective.
Bi-directional printing
position adjustment is
poor.
Stay shaft movement is
not smooth.
The space belt is
defective.
The space belt tension is
inadequate.
The space motor is
defective.
The control board is
defective.
The manual paper
thickness adjustment dial
is set improperly.
Automatic paper
thickness control is
defective.
The ribbon is fluffy.
Ribbon residue or ink
adheres to the print head.
• The manual paper
thickness adjustment
dial is set improperly.
• The ink ribbon has
reached the end of its
life.
• The gap between the
print head and platen is
inadequate.
• The print head is
defective.
• The control board is
defective.
30
Response
Replace the print head.
Connect the carriage
cable properly.
Replace the carriage
cable.
Replace and initialize the
control board.
Properly adjust the
bi-directional printing
position.
Clean and grease the stay
shaft.
Replace the space belt.
Check the tension pulley
unit.
Replace the space motor.
Replace and initialize the
control board.
Adjust the manual paper
thickness adjustment dial.
Replace and readjust the
card guide.
Replace the ribbon
cartridge.
Remove ink or ribbon
residue from the print
head.
• Adjust the paper
thickness adjustment dial
according to paper
thickness.
• Replace the ink ribbon.
• Adjust the gap between
the print head and
platen.
• Replace the print head.
• Replace the control
board.