Epson TM-U200 Series Technical Manual page 102

C o n fid e n tia l
Table 4-1 Troubleshooting table for printer operation failure (Continued)
Problem
Semi-automatic
loading is not
executed.
(Paper is not
fed.)
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.)
Dots are missing
continuously. (A
specific dot is
not printed.)
4-12 Troubleshooting
Probable cause
The paper supply
operation may be
incorrect.
The paper path may
be incorrect.
The connector is not
inserted correctly.
The paper feed motor
may be bad.
The paper hold roller
assembly may be
worn.
The gears may be
worn or damaged.
The paper detection
switch assembly may
be bad.
Probable cause
The ribbon in the
ribbon cassette may
be bad.
The platen gap may
be incorrect.
The common wire of
the print head unit
may be bad.
The head flexible
plastic cable (FPC)
may be bad.
The head FPC may be
bad.
The drive coil of the
print head unit may
be bad.
The dot wires of the
print head unit may
be bad.
Level Checkpoint
A Check if the paper roll meets
printer specifications.
A Check if the paper supply path
is blocked by paper particles or
foreign materials.
A Make sure the PF motor cable
pins are inserted in connector
CN6 of the main circuit board.
B Check if the motor rotates
during semi-automatic loading.
B Check if the paper hold rollers
are worn or damaged.
B Check if the paper feed
reduction gear and paper feed
gear are worn or damaged.
B Using an oscilloscope, check if
the detection signal is output
when roll paper is inserted.
Level Checkpoint
A Check if the color of the ribbon
is faded or the ribbon is
wrinkled or torn.
B Check the platen gap
(standard: 0.55 mm ± 0.05 mm).
B Check the continuity of the
common wire.
B Check the continuity of the
common line.
B Check the continuity of the
head FPC.
B Using a meter, check the
resistance of the corresponding
drive coil. (Standard: 19.2 ohms
± 5%)
B Check if the dot wires are
broken.
Action
Use the correct paper roll.
(See "P P P P a a a a p p p p e e e e r r r r S S S S p p p p e e e e c c c c i i i i f f f f i i i i c c c c a a a a t t t t i i i i o o o o n n n n s s s s " " " "
in Chapter 1.)
Remove any pieces of
paper, paper particles, or
foreign materials.
Reinsert the connector.
Replace the paper feed
motor.
Replace the paper hold
roller assembly.
Replace any worn or
damaged parts.
Replace the paper
detection switch assembly.
Action
Replace the ribbon
cassette.
Adjust the platen gap.
(See "Adjustments" in
Chapter 5.)
Replace the print head
unit.
Replace the head FPC.
Replace the head FPC.
Replace the print head
unit.
Replace the print head
unit.
Rev. A