Citizen iDP3550 Service Manual page 17

• Printing failure
Phenomenon
No printing
Paint printout
Missing dots
Badly blurred
printout
Bad printing quality
Cause
Faulty AC supply voltage
Faulty mounting or
connection of the printer
mechanism
Faulty printer mechanism
Non-recommended paper is
used.
Faulty ink ribbon
Low AC supply voltage
Faulty connection of the
printer mechanism
Foreign substance is
attached to the print head.
Faulty print head
Bent ribbon mask
Faulty AC supply voltage
Foreign substance is
attached to the print head.
Faulty paper
Faulty ink ribbon
Low AC supply voltage
Check Method
Check whether the
specified AC voltage is
used.
Check mounting and
connection of the printer
mechanism.
Check wear and tear of the
ink ribbon.
Check the supply voltage
with an AC voltmeter.
Check whether the
printer mechanism cable is
properly connected.
Check the head for any
adhered foreign substance.
Check whether the ribbon
mask is bent or not.
Check whether the
specified AC voltage is
used.
Check the head for any
adhered foreign substance.
Check whether the paper
meets the specifications.
Check wear and tear of the
ink ribbon
Check the AC supply
voltage with an AC
voltmeter.
13
iDP3550/3551 Service Manual
Remedy
Use the specified AC
voltage.
Mount the printer
mechanism properly.
Replace the printer
mechanism.
Replace it with the
specified paper.
Replace the ink ribbon.
Use the AC voltage within
the specified range.
Connect the printer
mechanism cable properly.
Dip a cotton swab or soft
cloth in ethyl alcohol and
wipe away the foreign
substance.
Replace the print head or
printer mechanism.
Correct the ribbon mask to
remove unwanted bending.
Use the specified AC
voltage.
Dip a cotton swab or soft
cloth in ethyl alcohol and
wipe away the foreign
substance.
Replace it with the
specified paper.
Replace the ink ribbon.
Use the AC voltage within
the specified range
CITIZEN