CBM-290/291 Service Manual
-
11 -
CITIZEN
4444. . . . T
TT
TR
R
R
RO
O
O
OU
U
U
UB
B
B
BL
LL
LE
E
E
ESSSSH
H
H
HO
O
O
OO
O
O
OT
TT
TIIIIN
N
N
NG
G
G
G
4444....1
1
1
1 T
TT
Trrrroooouuuubbbblllleeeesssshhhhoo
oo
oo
oottttiiiinnnng
g
g
g P
PP
Prrrroooocccceeeedddduuuurrrreeee
When a trouble occurs, confirm its phenomenon, locate a defective part in accordance with 4.2
Troubleshooting Guide, and troubleshoot as described below.
·
Phenomenon: Find a trouble phenomenon in this column. If there are multiple
phenomena, take all the corresponding items into consideration.
This allows you to specify a hidden defective part.
·
Cause:
Lists as many possible causes as possible. Guess a trouble cause out
of them and take its check method to specify the trouble cause.
·
Check Method: Describes a check method to specify a trouble cause.
·
Remedy:
Troubleshoot by taking a remedy described in this column.
By troubleshooting in accordance with the above-mentioned procedure, you can troubleshoot
efficiently with fewer misjudgments.
4444....2
2
2
2 T
TT
Trrrroooouuuubbbblllleeeesssshhhhoo
oo
oo
oottttiiiinnnng
g
g
g G
G
G
Guuuuiiiiddddeeee
Phenomenon
Cause
Check Method
Remedy
Faulty power supply
Check whether 5 V DC is
available.
Supply 5 V/24 V DC.
Faulty mounting and
connection of an interface
cable
Check mounting and
connection of the interface
cable.
Connect the interface
cable correctly.
Printing failure
No printing
Faulty printer mechanism
Replace
the
printer
mechanism unit.
Thin printing color Faulty power supply
Check whether a 5 V/24
V DC power capacity is
sufficient.
Use the power source
with a sufficient capacity.
Missing dots
Foreign substance adhered
to a printing head
Check the head for any
adhered foreign substance.
Dip a cotton swab or soft
cloth in ethyl alcohol and
wipe away the foreign
substance.
Faulty power supply
Check whether a 5 V/24
V DC power capacity is
sufficient.
Use the power source
with a sufficient capacity.
Badly blurred
printout
Contaminated thermal
head
Check the thermal head
for any contamination.
Dip a cotton swab or soft
cloth in ethyl alcohol and
wipe away the foreign
substance.
Bad printing
quality
Faulty printing paper
Check whether the paper
meets the specifications.
Replace it with the
specified paper.
Faulty connection of a
motor connector
Check connection of the
connector.
Connect the connector
correctly.
Faulty power supply
Check whether a 5 V/24
V DC power capacity is
sufficient.
Use the power source
with a sufficient capacity.
Paper feed failure
A printing paper
feed motor does
not function or
malfunctions.
Faulty printer mechanism
Replace
the
printer
mechanism.
