Rev. 1.00
- 101 -
SRP-275II
7-2-2 Printing quality problems
Problem
Probable Cause
Level
Checkpoint
Action
FPC-head
connector is disconnected
with
ASSY-PCB MECHA
and
Printer-head
B
Check if the
FPC-head
is
properly inserted into its
connector of head and its
board
If is not, securely
reinsert the
FPC-
head
Broken common lead of
FPC-head
B
Check the conductivity
between the common lead of
FPC-head
and other
terminals
Replace the HEAD
unit, if there is no
conductivity
FFC
(35pin) between the
ASSY-PCB
MECHA
and
ASSY-PCB MAIN
is
broken
B
Check the conductivity of the
FFC
(35pin)
Replace the
FFC
(35pin) if there is
no conductivity
Positional relationship between
Printer-head
and
Platen
B
Check if the gap between the
platen and the pin of head is
correct value : 0.40±0.05mm
Correct the gap
Ribbon cassette
is absent
A
Check
Ribbon cassette
’s
existence
Insert
Ribbon cassette
HC motor
rotates
normally but
no dot printing
is performed
Input pulse irregularity
B
Check firing input pulse with
an oscilloscope
Replace
ASSY-PCB MAIN
Damaged lead in
FPC-head
B
Check the conductivity of
lead of
FPC-head
Replace
FPC-head
Positional relationship between the
head and the platen
B
Check if the gap between the
platen and the pin of head is
correct value : 0.45±0.05mm
If incorrect,
performed repair with
reference
FFC
(30pin) is failure or disconnected
between
ASSY-PCB MECHA
and
ASSY-PCB MAIN
B
Check the connected
condition of
FFC
and
FFC
failure
Make sure the
connection and
replace the
FFC
A certain dot
does not print
Defective
Printer-head
B
Check head response to
command with oscilloscope
Replace
Printer-head
Belt tension is loose
B
Check
Spring-lever-tension
for deformation
Replace or
reassemble
Spring-
lever-tension
Carriage drive area contamination
B
Check gears and pulleys for
dirt deposits or other foreign
matter
Remove any dirt
deposits or foreign
matter
Character
width changes
irregularly
Carriage drive parts wear or damage
B
Check if there are defective
parts among gears
Replace defective
gear
Ribbon cassette
is exhausted
A
Check for ink of ribbon
cassette
Replace
Ribbon cassette
Head gap is not correct between
head and platen
B
Check the gap
If incorrect, performed
repair with reference
Print is very
faint
Defective
Printer-head
B
Check head response to
command with oscilloscope
Replace
Printer-head