One of the most common problems with TSC brand thermal printers (TE244, TTP-244 Pro, TC200, DA220, etc.): the printer doesn't detect labels correctly. Labels skip, leave gaps, or the "Error" light flashes.
The root cause of this problem is usually sensor type incompatibility or lack of calibration.
Gap Sensor vs Blackmark: Understanding the Difference
TSC printers have two different label detection methods:
| Feature | Gap (Space) Sensor | Blackmark (Black Mark) Sensor |
|---|---|---|
| Working principle | Detects transparent gap between labels | Detects black line on back of label |
| Sensor type | Transmissive (transparent – light transmission) | Reflective (reflection from black line) |
| Label type | Standard labels (with gaps between them) | Continuous roll, labels with black line on back |
| Use case | Address labels, barcode labels, shipping labels | Receipts, label rolls, custom-cut labels |
You're using gap labels but the printer is in blackmark mode. Or you're using blackmark labels but in gap mode. Result: printer can't find the label, skips, gives error.
Problem Identification: What Are the Symptoms?
Gap Sensor Issues
- ✗ Printer skips one blank label every 2 labels
- ✗ Labels printing shifted up or down
- ✗ "Error" or "Paper Out" LED is on
- ✗ Printer starts printing from the middle of the label
Blackmark Sensor Issues
- ✗ Printer keeps advancing but doesn't stop
- ✗ Labels are cut at random sizes
- ✗ "Media Error" message appears
- ✗ Sensor doesn't see the black mark
Solution 1: Set the Sensor Type Correctly
Using TSC Diagnostic Tool
Download TSC Diagnostic Tool – you can download it from TSC support page
Run the program and select the printer (USB connected)
Go to "Printer Configuration" tab
Check the "Sensor Type" setting:
- Normal label → Select Gap
- Label with black line on back → Select Black Mark
- Continuous paper (uninterrupted) → Select Continuous
Click "Set" or "Apply" button
Click "Calibrate" button to start calibration ✅
From the Printer (Using Buttons)
You can also adjust settings on TSC printers using button combinations:
Turn off the printer
Keep pressing the FEED button while turning on the printer
Release the button when LED starts flashing
Printer will perform automatic calibration – it will advance a few labels
Calibration is complete when LED stays solid ✅
On TSC TE244 and TTP-244 Pro models, pressing the FEED button for 3 seconds starts calibration. Some models may require PAUSE + FEED combination – check your manual.
Solution 2: Physically Clean the Sensor
If calibration doesn't work, the sensor may be dirty:
Turn off the printer and unplug it
Open the cover and remove the label roll
Find the sensor area – usually at the bottom of the label path
Wipe the sensor with a cotton swab moistened with isopropyl alcohol (99%)
Wait for it to dry (1-2 minutes)
Insert label roll and perform calibration ✅
Never touch the sensor with metal objects. A scratched sensor can be permanently damaged. Use only soft cotton swabs.
Solution 3: Check Sensor Position
On some TSC models, the gap sensor can be moved horizontally. The gap section of the label must be directly above the sensor.
| Model | Sensor Position | Adjustable? |
|---|---|---|
| TSC TE244 | Center | No (fixed) |
| TSC TTP-244 Pro | Center | No (fixed) |
| TSC TC200/300 | Adjustable | Yes – sliding mechanism |
| TSC DA220 | Center | No (fixed) |
On models with fixed sensors, make sure the label roll is centered. If the label roll shifts to one side, it will disrupt sensor reading.
TSC Printer Sensor Settings with TSPL Commands
For technical users: TSC printers support the TSPL command language. You can send commands directly via terminal or TSC Diagnostic Tool:
GAP 3 mm, 0 mm // Gap sensor: 3mm gap BLINE 3 mm, 0 mm // Blackmark sensor: 3mm black line DIRECTION 1,0 // Print direction CLS // Clear screen PRINT 1,1 // Print 1 copy
Model-Based Troubleshooting Guide
TSC TE244
- Most common issue: not calibrating after label change
- Solution: Press and hold FEED button for 3 seconds to calibrate
- Gap sensor is in fixed position – make sure label is centered
TSC TTP-244 Pro
- Industrial model – ribbon must be installed
- If ribbon is finished or installed incorrectly, sensor errors may occur
- Also clean the ribbon detection sensor
TSC DA220
- Direct thermal model – doesn't use ribbon
- Easy setup but sensitive sensor – dust accumulation causes problems
- Sensor cleaning recommended every 3 months
Work with Your TSC Printer on macOS
Fully compatible with TSC printers. No driver and calibration hassle.
Try LabelInn for Free →Frequently Asked Questions
Are gap and blackmark sensors the same on my TSC printer?
No. Gap sensor (transmissive) detects the gap between labels via light transmission. Blackmark sensor (reflective) detects the black line on the back of the label via reflection. They are different physical sensors, but some models have a single sensor that supports both modes.
How many labels are wasted during calibration?
Usually 2-4 labels. This is normal, the sensor is learning the label size and gap.
Can I use a TSC printer on macOS?
Yes. TSC printers support ZPL emulation. You can use them on macOS without installing a driver with LabelInn.
Does TSC Diagnostic Tool work on macOS?
No, it only works on Windows. For sensor settings on macOS, you can use LabelInn or send TSPL commands via terminal.