—
— 78
Semi-automatic
loading is not
executed.
(Paper is not
fed.)
The paper supply
operation may be
incorrect.
Check if the paper roll
meets printer specifications.
Use the correct paper roll.
(See “Paper Specifications”
in Chapter 1.)
The paper path may
be incorrect.
Check if the paper supply
path is blocked by paper
particles or foreign materials.
Remove any pieces of
paper, paper particles, or
foreign materials.
The connector is not
inserted correctly.
Make sure the PF motor cable
pins are inserted in connector
CN6 of the main circuit board.
Reinsert the connector.
The paper feed
motor may be bad.
Check if the motor rotates
during semi-automatic loading.
Replace the paper feed
motor.
The paper hold
roller assembly may
be worn.
Check if the paper hold
rollers are worn or
damaged.
Replace the paper hold
roller assembly.
The gears may be
worn or damaged.
Check if the paper feed
reduction gear and paper feed
gear are worn or damaged.
Replace any worn or
damaged parts.
The paper detection
switch assembly
may be bad.
Using an oscilloscope, check
if the detection signal is output
when roll paper is inserted.
Replace the paper
detection switch assembly.
Table 4-2 Troubleshooting table for bad printing
Problem
The printer does
not print. (The
carriage motor
operates, but
nothing is
printed, or the
print color is
light.)
The ribbon in the
ribbon cassette may
be bad.
Check if the color of the
ribbon is faded or the ribbon
is wrinkled or torn.
Replace the ribbon
cassette.
The platen gap may
be incorrect.
Check the platen gap
(standard: 0.55 mm
±
0.05 mm).
Adjust the platen gap.
(See “Adjustments” in
Chapter 5.)
The common wire of
the print head unit
may be bad.
Check the continuity of the
common wire.
Replace the print head
unit.
The head flexible
plastic cable (FPC)
may be bad.
Check the continuity of the
common line.
Replace the head FPC.
Dots are missing
continuously. (A
specific dot is
not printed.)
The head FPC may
be bad.
Check the continuity of the
head FPC.
Replace the head FPC.
The drive coil of the
print head unit may
be bad.
Using a meter, check the
resistance of the
corresponding drive coil.
(Standard: 19.2 ohms
±
5%)
Replace the print head
unit.
The dot wires of the
print head unit may
be bad.
Check if the dot wires are
broken.
Replace the print head
unit.
Table 4-1 Troubleshooting table for printer operation failure (continued)
Problem
Probable cause
Probable cause
Action
Action
Checkpoint
Checkpoint
Level
Level
A
A
A
B
B
B
B
B
B
B
B
B
B
A
Summary of Contents for UP-250
Page 1: ...EXTERNAL PRINTER FEB 2000 MODEL UP 250 without price TECHNICAL MANUAL ...
Page 95: ... 86 END END Yes No Action 4 Replace main PCB Replace printer OK Action 4 mechanism assembly ...
Page 136: ... 127 ...
Page 149: ... 140 Main Circuit Board Parts Layout ...
Page 150: ... 141 RS 232 Serial Interface Circuit Board Parts Layout ...
Page 151: ... 142 IEEE 1284 Parallel Interface Circuit Board Parts Layout ...
Page 152: ...RS 485 Serial Interface Circuit Board Parts Layout 143 ...
Page 160: ... 151 Case Unit Lubrication Points Diagram 4 G 31 4 G 31 3 G 31 3 G 31 ...
Page 163: ... 154 EXPLODED DIAGRAM FOR TM U200B U210B NO 1 ...
Page 164: ... 155 EXPLODED DIAGRAM FOR TM U200B U200PB U210B U210PB NO 2 ...
