6-3 repair guidelines, Srp-270, Rev. 3.02 – BIXOLON IMPACT PRINTER SRP-270 User Manual
Page 68
Rev. 3.02
- 68 -
SRP-270
8-6-3 Repair Guidelines
Phenomenon
Condition
Cause
Level
Check point & Method
Repair Method
①
Defective
power input to
motor
B
·Check the input
power
·Check the input
voltage (24V±2V)
between the
motor terminals
of the connector
using a tester or
oscilloscope
·Inspect and repair
the power
supply circuit
②
Defective
motor drive
signal
B
·Check input signal
·Check if the signal
is being input
to the motor drive
terminal of the
connector using
an oscilloscope
·Replace the
drive signal
generating
circuit
③
Damaged
or Improper
connection
between
motor terminals
of the
connector
B ·Check
the
conductivity
between the
pertinent terminals
·Replace the main
circuit board Assy
if there is no
conductivity
·If improperly
connected,
reconnect
the pertinent
leads in the proper
manner
④
Defective
motor
B
·Apply 24V to the
leads of the
motor then check
the rotation
(red: + black: -)
·Replace the
motor, if it
does not rotate
1. Motor
does not
rotate
Motor does not
rotate despite
printing
command
has been given
⑤
Occurrence
of paper jam
A
·Check the deformation
of Head pin guide or
platen paper guide
·Replace Head
pin guide or platen
paper guide if they
are deformed or
destroyed
Head FPC
①
is disconnected
from it
connection
B
·Check if the head FPC
is properly inserted
into its connector
·If not, securely
reinsert the head
FPC
Broken
②
common
lead in head
FPC
B ·Check
the
conductivity
between the common
lead of head FPC and
other terminals
(20Ω±10%)
·Replace the
head unit, if
there is no
conductivity
Common
③
lead between
the head FPC
and connector
is broken
A ·Check
the
conductivity
of the common
lead section
·Check the voltage
(28V±2V)
·Replace the main
circuit board Assy
if there is no
conductivity or 28V
2. No dot
printing
is performed
Motor rotates
normally but no
dot printing is
performed
Defective
④
timing detector
sub Assy
B ·Observe
by
oscilloscope
to check if a timing
signal is being
generated
·Replace the timing
detector sub Assy,
if no timing signal is
being generated