Epson TM-U200 Series Technical Manual page 101

C o n fid e n tia l
Table 4-1 Troubleshooting table for printer operation failure (Continued)
Problem
Data from the
host is printed
incorrectly.
The PAPER OUT
LED does not
correctly
indicate the
status of the
paper roll.
The printer is not
initialized (home
position
detection error).
Rev. A
Probable cause
An incorrect interface
cable may be used.
For the serial interface
models, the printer DIP
switch settings do not
match the host
settings.
The main circuit board
unit may be bad.
The mechanism
assembly may be
bad.
The near-end
detector assembly
may be bad. (The
near-end detector is
an option.)
The connector is not
inserted correctly.
The carriage motor
assembly may be
bad.
The carriage motor
may be bad.
The home position
detector assembly
may be bad.
TM-U200 Series (Type A/AM) Technical Manual
Level Checkpoint
A Check if the interface cable
matches the printer
specifications.
A Check if the printer DIP switch
settings match the host settings.
B Check the printer using another
main circuit board unit.
B The cause is none of the
above.
B Check the signal of the near-
end detector assembly.
A Check if the pins of CR motor
cable are inserted in connector
CN5 of the main circuit board
unit.
B Check the continuity of each
terminal.
B The cause is none of the
above.
B Using an oscilloscope, check if
the detection signal is output
when the print head unit passes
above the home position
detector assembly.
Action
Use the correct interface
cable.
Change the printer DIP
switch settings or host
settings so that they
match.
Replace the main circuit
board unit.
Replace the mechanism
assembly.
Replace the near-end
detector assembly.
Reinsert the connector.
Replace the carriage
motor assembly.
Replace the carriage
motor assembly.
Replace the home position
detector assembly.
Troubleshooting 4-11