Message	Cause	Remedy
NO INK RIBBON	Ribbon used up or not running evenly	Replace the ribbon; remove and reload the material and continue printing
NO PRINTED MATERIAL	No tube/tape loaded	Load the material; check the changeover lever is locked
COVER IS OPENED	Cover opened during printing	Close the cover until it clicks
THERMAL HEAD IS UNUSUAL	Print head overheated	Let the printer rest for a while, then print again
ERROR IN HALF CUT OPERATION	Half cutter not operating	Push the material out, refit or replace the LM-HC340 cutter
OVER TOTAL PRINT LENGTH	Print length exceeded (tube 100 m, tape 5 m)	Split the file in two or print a range
OVER PITCH LENGTH	Text longer than the set piece length	Increase the piece length, reduce character size or number of characters
USB MEMORY UNIDENTIFIABLE	USB drive not formatted correctly	Format as FAT16/FAT32; do not use security-locked USB drives
CANNOT RECALL THIS FILE	File in the wrong format	Only CSV or LMF files can be read
[PC CONNECTION] DATA ERROR	Data from the PC is faulty	Print only from LETATWIN PC EDITOR; check the USB cable
BATTERY VERY LOW	Battery low (LM-550A3B)	Replace with fully charged AA eneloop batteries or plug in the adapter

Symptom	Check
Faint or broken text, horizontal white streaks	Is the cover firmly closed; is the correct tube size selected; is the ribbon not slack; are the head and tube clean. In cold weather: turn on LOW TEMP MODE (20 mm/s) and raise PRINTING DENSITY.
Pieces shorter than set	Dirty platen: clean with the FEED function; check the tube is not twisted or snagged on the roll.
Text not centred on the piece	Adjust CUTTING POSITION in the OPTION menu.
Tube jammed	Remove tube scraps at the exit; clear with the FEED function, do not pull by hand.
Half cut too shallow to snap off	Set the depth lever to TUBE; replace the cutter if it has made over 5.000 cuts.
PC does not detect the printer	Make sure the USB cable is firmly plugged in; reinstall the driver and LETATWIN PC EDITOR.

Symptom	Cause	What to do
Printed piece 2 mm or more shorter than set, text shifted left	Dust on the platen roller	Switch off, remove the platen roller and wipe it with a well-wrung damp cloth or a soft cloth with alcohol; for label adhesive, press the sticky side of tape onto it to lift it off
Thin white lines in the text	Dirty print head	Turn off the main switch at the back, wipe the heating elements in the middle of the head with an alcohol (ethanol) swab, sideways; replace the head if that does not help
Printer keeps printing with no material	Dirty material sensor	Wipe the sensor with a soft dry cloth
Blank cells when printing block markers, or block marker not detected	Dirty block marker sensor	Wipe the sensor window and the back of the block marker guide with a dry cloth or cotton swab
Label tape wraps around the platen	Adhesive on guides B and D	Lift the adhesive off guides B and D with the sticky side of tape; clean regularly
φ12 – 19 mm tube jams at the exit	Wrong exit guide plate	Use the WIDE guide for heat-shrink φ12 – 19 and NARROW for other materials
Faint print below 20 °C	Tube has hardened	Turn on the tube heater (φ1,5 – 4,6 mm) or slow print mode

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