Rev.D Troubleshooting 1-9
TM-U675/U675P (with autocutter) Service Manual
Confidential
Troubleshooting Using the ERROR LED
You can learn the cause of a failure by checking the ERROR LED code. The following table
shows problems and solutions to repair the printer. Numbers in the "Solutions" column indicate
the order to use to check the problem. If you cannot determine the cause of the problem after
checking all the solutions listed, go back to the flowchart given earlier in this chapter.
Table1-2 Error causes and solutions
Type of Error and ERROR LED Pattern Explanation
Solutions
(Listed in the order you should use to check printer)
Autocutter Error An autocutter error
was detected.
1. Check for paper jams around the autocutter. (See
page 1-19.)
2. Check the cutter motor assembly. (See page 1-11.)
If there has been a short in the cutter motor
assembly, replace the main circuit board unit at
the same time. (See page 2-96.)
3. Replace the main circuit board unit and see if the
problem is fixed. (See page 2-96.)
If the printer is repaired, refer to Test Points on the
Main Circuit Board Unit (See page 1-12.) to analyze
the defective areas on the board.
Carriage home position detection
error
The head carriage
home position was
not correctly
detected.
1. Check the carriage assembly for a paper jam.
(To remove the carriage cover, see page 1-16.)
2. Check for paper dust on the H.P. detector
assembly. (To remove the carriage cover, see
page 1-16.)
3. Replace the H.P. detector assembly. (See page 2-
22.)
Carriage out-of-step error There is no carriage
detector output
even when the
carriage is
instructed to move.
1. Check the carriage assembly for a paper jam.
(To remove the carriage cover, see page 1-16.)
2. Check the rotary encoder on the carriage motor
gear used to detect carriage position (The rotary
encoder is on the intermediate circuit board
assembly. You need to disassemble the
intermediate circuit board assembly to check the
encoder. To remove the intermediate circuit
board assembly, see page 2-22.)
3. Check the carriage motor. (See page 1-11.)
If the motor is shorted, replace it along with the
main board.
4. Replace the main circuit board unit and see if the
problem is fixed. (See page 2-96)
Slip eject error The slip paper was
not ejected
normally.
1. Look into the printer from the left side to check for
a paper jam in the slip paper transport path.
2. Check the paper feed motor. (See page 1-11)
If the motor is shorted, replace it along with the
main board.
3. Try installing a new main circuit board unit to see if
the printer is fixed. (See page 2-96)
320ms
5120ms
LED ON
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