Epson TM-U675 Service Manual page 14

Confidential
Table1-1 Symptoms and Checkpoint
Symptom
Ribbon won't feed.
Unevenness occurs in the concentration of
the print.
There is ink smudging on the print surface.
Paper jams
Roll paper feed failure
Slip paper/validation paper feed failure
Roll paper take-up failure
The printer won't recognize when slip paper
is inserted.
The printer won't recognize when validation
paper is inserted.
Roll paper semi-auto loading paper feed
failure
1-2 Troubleshooting
Checkpoints (by Priority)
1. Replace the ribbon cassette. (See page I-8.)
2. Check sprocket and gears for paper particles.
3. Check the carriage motor and gears. (See page 1-11.)
4. Replace the main circuit board. (See page 2-96.)
1. Replace the ribbon cassette. (See page I-8.)
2. Adjust the platen gap. (See page 3-8.)
1. Check for paper residue around the print head unit.
2. Adjust the platen gap. (See page 3-8.)
Remove the jammed paper by following the directions in
"Removing Paper Jams" on page 1-19.
1. Check that the roll paper is inserted correctly. (See page I-3.)
2. Check the paper feed motor. (See page 1-11.)
3. Check the J/S change solenoid. (See page 1-11.)
4. Replace the main circuit board unit. (See page 2-96.)
1. Check that the slip paper/validation paper is inserted correctly.
(See page I-10)
2. Check the paper feed motor. (See page 1-11.)
3. Check the J/S change solenoid. (See page 1-11.)
4. Replace the main circuit board unit. (See page 2-96.)
1. Check that the roll paper is inserted correctly. (See page I-3.)
2. Check that the take-up assembly is installed correctly into the
printer. (See page I-6.)
3. Check that the take-up belt is attached correctly.
(See page 2-112.)
4. Check the paper feed motor. (See page 1-11.)
5. Check the J/S change solenoid. (See page 1-11.)
6. Replace the main circuit board. (See page 2-96.)
1. Clean away dirt around the slip B. O. F. detector assembly or the
slip T. O. F. detector assembly. (See page B-2.)
2. Replace the slip B. O. F. detector assembly. (See page 2-63.)
3. Replace the slip T. O. F. detector assembly. (See page 2-77.)
4. Replace the main circuit board unit. (See page 2-96.)
1. Clean away dirt around the validation detector assembly. (See
page B-2.)
2. Replace the validation detector assembly. (See page 2-63.)
3. Replace the main circuit board unit. (See page 2-96.)
1. Check that the roll paper is inserted correctly. (See page I-3.)
2. Remove paper residue and dirt from the inside the paper feed
frame assembly.
3. Check the paper feed motor. (See page 1-11.)
4. Check the J/S change solenoid. (See page 1-11.)
5. Replace the main circuit board unit. (See page 2-96.)
Rev.D