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Table 4-1 Troubleshooting table for printer operation failure (continued)
Problem
Probable cause
Data from the
An incorrect interface
host is printed
cable may be used.
incorrectly.
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 PAPER OUT
The near-end
LED does not
detector assembly
correctly
may be bad. (The
indicate the
near-end detector is
status of the
an option.)
paper roll.
The printer is not
The connector is not
initialized (home
inserted correctly.
position
detection error).
The carriage motor
assembly may be
bad.
The carriage motor
may be bad.
The home position
detector assembly
may be bad.
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.
Check the signal of the near-
B
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.
— 77
—
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.
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Table of Contents
Troubleshooting
