TM200 Service Manual
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4 Troubleshooting
4.1 Symptoms and Solutions
This explains how to find the source of a problem using the symptom. The numbers in the
“Checkpoints” column
indicate the order to use to check the problem. If you cannot
determine the cause of the problem after checking the first item, proceed to the next number.
Table 4-1 Symptoms and checkpoints
Symptom
Checkpoints (by Priority)
Power does not turn on.
Power on self check is not
completed
Or, POWER LED does not light.
1. Check the power supply unit. Check that 24V is coming out of
the power supply
2. Check the main circuit board unit.
3. Unplug the printer. Then unplug each motor or coil's
connector from the main board one by one; plug the printer
back in, and power it on. This will let you know if any motor or
coil has burned out and is pulling down the power.
4. Replace the I/F circuit board.
There are missing dots
in the print
Receipt
printing
1. Clean the thermal print head. (See page 30)
2. Replace the thermal print head module. (See page 44)
3. Replace the main circuit board unit. (See page 47)
The print is thin.
Receipt
printing
1. Clean the thermal print head. (See page 30)
2. Adjust DIP switches DSW 1-3 and 1-4 (print density selection
switches). (See page 12)
3. Replace the thermal print head module. (See page 44)
4. Replace the main circuit board unit. (See page 47)
Unevenness occurs in
the concentration of
the print.
Receipt
printing
1. Clean the thermal print head. (See page 30)
2. Replace the thermal print head module. (See page 44)
3. Replace the main circuit board. (See page 47)
Paper feed failure.
Thermal
printer
1. Check that the roll paper is properly loaded.
2. Check the receipt paper feed motor.
3. Replace the main circuit board. (See page 44)
Paper jams
Remove the jammed paper by following the directions in
“Clearing Paper Jams.”
Missing characters/misprinted
characters/font breakdown.
1. Check the DIP switch settings.
2. Replace the interface cable. (See page 47)
ERROR LED is lit.
1. Close the cover.
2. Install a new paper roll.
