Fit four AA batteries and a LetraTag cassette
- Switch the LT-100H off and open the battery compartment. Fit four matching AA alkaline batteries with their ends aligned to the polarity marks. Replace the battery cover. Use a fresh set when you are diagnosing a power problem.
- Press and release the cassette cover to open the tape compartment. Check the refill box for the LetraTag LT family and 12 mm width.
- Align the cassette so its tape is between the printhead and the pinch roller, as shown in DYMO’s loading diagram. Press it until it clicks into place, then close the cassette cover.
- Turn the machine on. If it prompts for a language, select it with the arrows and OK. You can change it later under Settings → Language. The date and time settings matter if you plan to insert a date on the label.
Choose the tape material for the job. White paper tape is a straightforward refill for files and dry indoor storage. For a label you expect to wipe, check the conditions for the specific plastic cassette. Use the separate iron-on media only where the garment and tape instructions allow it. DYMO LT-100H user guide · DYMO LetraTag tape range
DYMO S0721510 is a 12 mm white paper cassette for black print. It makes sense as a spare when most of your first labels will go on files or other dry indoor surfaces. DYMO S0721510 paper tape
12 mm · indoor paper labels
DYMO LetraTag white paper tape
One genuine white paper cassette for black text on files, folders and dry indoor storage.
Keep in mind. Use a 12 mm LetraTag label maker. Choose a different supported material for garments or surfaces that need regular wiping.
- 12 mm × 4 m
- Black on white
- One paper cassette
Print and cut one short label
Type a word such as SPARES. The LT-100H’s alphabetical keyboard has separate modes for capitals and numbers, so look at the indicators on the screen if a key produces an unexpected character. Use the left and right arrows to move through a label that extends beyond the screen.
Choose Settings → Preview and press OK to scroll through the text. Press Print when you are ready. After the printing message has cleared and the tape has stopped moving, press the cutter button. Peel the backing from the cut label and apply it to the intended surface. Check size and legibility before making more.
Add a second line, change the size or insert a symbol
For two lines, type the first line, open Insert, choose Second Line and press OK. Type the second line after the line break marker. In preview, the machine scrolls both lines with a break indicator. Use a short first and second line if the label needs to fit on a small container.
For larger or smaller text, open Format → Size, choose a size and press OK. The setting applies to the whole label. The Insert menu also gives access to symbols. If you want to use the previous text again, check it before clearing the screen. The LT-100H remembers the last label after normal automatic power-off. DYMO LetraTag support
Check the symptom before replacing anything
| Symptom | First check |
|---|---|
| The display stays off | Check the power button, battery direction and a fresh set of four matching AA alkaline cells. |
| Letter keys produce numbers | Press the blue Num Lock key to restore letter entry. |
| Tape Jam message | Switch off, check the cassette and remove the jammed label if accessible. Replace a damaged cassette and follow the manual if the cutter is still stuck. |
| Weak or patchy print | Check batteries and cassette seating, then try a short label with a known good cassette. Use DYMO’s model-specific printhead cleaning guidance if the fault persists. |
| The label is too long for the space | Shorten the wording or change its format. For a stacked design, use Second Line and check the preview before printing. |
If the print is legible but too light for the job, the manual shows a contrast setting under Settings. Make one change and print a short sample. If the same parts of the letters disappear each time, check the cassette and printhead before increasing contrast. The manual covers cutter care separately from printhead cleaning. Follow its cutter instructions if the blade is stuck and keep fingers clear of the blade.
DYMO instructions
Common questions
What tape fits the LetraTag LT-100H?
Use a 12 mm DYMO LetraTag LT cassette. Paper is a useful option for dry indoor filing and storage. Check the specific plastic or textile cassette for other surfaces. DYMO D1 belongs to a different printer family.
Why does my LetraTag type numbers when I press letters?
Check the Num Lock indicator on the display. Press the blue Num Lock key to switch it off. The A through J keys return to letters.
How do I print a two-line label on the LT-100H?
Type the first line, press Insert, select Second Line and press OK. Type the second line, then print. The break marker on the display is a formatting indicator.
Why did my LT-100H screen go blank after I put it down?
DYMO’s manual says the printer switches off automatically after about two minutes without activity. Turn it on again. If the display stays blank, check the orientation and condition of the four AA alkaline batteries.
Does the LT-100H need a phone or ink cartridge?
Type and print using its built-in keyboard and screen. The LetraTag cassette is the printing supply. The machine uses direct thermal printing, so you buy the correct tape rather than a separate ink cartridge.