Service manual

4-10 Troubleshooting Rev. B
Confidential
Data from the
host is printed
incorrectly.
An incorrect interface
cable may be used.
A Check if the interface cable
matches the printer
specifications.
Use the correct interface
cable.
For the serial interface
models, the printer DIP
switch settings do not
match the host
settings.
A Check if the printer DIP switch
settings match the host settings.
Change the printer DIP
switch settings or host
settings so that they
match.
The main circuit board
unit may be bad.
B Check the printer using another
main circuit board unit.
Replace the main circuit
board unit.
The mechanism
assembly may be
bad.
B The cause is none of the
above.
Replace the mechanism
assembly.
The PAPER OUT
LED does not
correctly
indicate the
status of the
paper roll.
The near-end
detector assembly
may be bad. (The
near-end detector is
an option.)
B Check the signal of the near-
end detector assembly.
Replace the near-end
detector assembly.
The printer is not
initialized (home
position
detection error).
The connector is not
inserted correctly.
A Check if the pins of CR motor
cable are inserted in connector
CN5 of the main circuit board
unit.
Reinsert the connector.
The carriage motor
assembly may be
bad.
B Check the continuity of each
terminal.
Replace the carriage
motor assembly.
The carriage motor
may be bad.
B The cause is none of the
above.
Replace the carriage
motor assembly.
The home position
detector assembly
may be bad.
B Using an oscilloscope, check if
the detection signal is output
when the print head unit passes
above the home position
detector assembly.
Replace the home position
detector assembly.
Table 4-1 Troubleshooting table for printer operation failure (Continued)
Problem Probable cause Level Checkpoint Action