POS Printer Not Printing?
Work Through It in Order.
A receipt printer that stops mid-shift is almost never a dead machine. Power, cable, paper, driver and routing faults all present the same way — as nothing coming out. The checks below are ordered so the lowest-cost cause is eliminated first.
What Exactly Is It Doing?
Six different faults all look like “not printing”. Identify which one you have before touching anything — the fix is different for each.
| What you see | What it usually means | Start at |
|---|---|---|
| Completely dead — no lights | Adapter, outlet, power switch | Layer 1 — Power |
| Power light on, nothing prints | Cable, port, driver | Layer 2 / Layer 4 |
| Feeds paper, prints nothing | Thermal side orientation | Layer 3 — Media |
| Prints a test page but not from the POS | Software, routing, queue | Layer 5 — Software |
| One station prints, another does not | Routing rules, station assignment | Layer 5 — Software |
| Prints, stops, prints again | Thermal protection, adapter rating | Layer 6 — Hardware |
The Five Checks That Resolve Most Cases
Work down the list. Each check is chosen because it removes more possible causes than the one below it, so stopping early leaves faults unresolved and going out of order wastes time.
Confirm Power
Check the indicator. A steady light means the printer is powered; a flashing light is usually an error state, not a power fault. Use the correct adapter — printers draw their highest current during printing, so a marginal adapter can power the unit on and still fail the moment a receipt is sent.
An 80 mm thermal printer typically requires DC 24 V at 1 A. A 12 V supply from a different model will light the panel and fail under load.
Reseat and Swap the Cable
Unplug and reconnect at both ends. If a spare cable is available, swap it rather than testing the original — a cable that fails intermittently will pass a quick inspection.
Move the connection to a rear port or a powered hub if the current port is shared. On network printers, confirm the address the driver is using still matches the printer.
Check Paper and the Paper Path
Confirm the roll is not empty and is loaded so the thermal side faces the printhead. Scratch the paper lightly with a fingernail — a dark mark indicates the thermal side.
A roll sitting on the wrong face will feed smoothly and print nothing. Confirm the roll diameter is within the model's specification; an oversized roll binds against the housing and stresses the feed motor.
Test the Driver
Remove duplicate offline printer queues, which can absorb jobs silently. Compare the installed driver with the version issued for your model.
On serial connections, confirm the baud rate matches. On USB connections, check the port in the driver properties against the port Windows actually assigned — a re-enumerated device can move to a new number after a reboot.
Check POS Routing and Printer Selection
Confirm the printer is selected and assigned in the POS application. In multi-station setups, a receipt printer can work correctly while kitchen tickets fail because a menu category is unassigned.
Check whether the ticket is in a printable state. Orders that have not been finalized are frequently held back by the application rather than the printer.
Is It the Printer or the System?
The self-test settles it in under a minute, and it is the single most useful thing you can run before ordering any part.
Run the self-test
Power the printer off. Hold FEED down and switch the power on while holding it. Release the button as soon as printing begins.
The strip prints the model, firmware version, interface type, default parameters and supported barcode types.
Read the result
- ✓ Self-test prints, POS does not — the fault is in the cable, driver, or POS routing. Do not touch the mechanism.
- ! Self-test also fails — the fault is in the printer itself: power, paper, or mechanism.
Repair or Replace
Most printer faults are resolved on site. A smaller set belongs with a service center, and knowing which is which prevents a small fault from becoming an expensive one.
✓ You can do this on site
- · Reseat or replace the data cable
- · Change paper and correct roll orientation
- · Clear debris from the paper path
- · Clean the printhead and roller
- · Reinstall the driver and clear offline queues
- · Correct station routing in the POS application
- · Run the self-test to confirm the mechanism
! Return to authorized service
- · Mainboard failure
- · Printhead replacement
- · Cutter mechanism replacement
- · Power module failure
- · Any sign of smoke, odour or liquid ingress
- · Repeated tripping of the supply circuit
Safety boundaries
- · Disconnect power before opening the paper cover or clearing a jam.
- · Let the thermal head cool fully before touching it — it reaches temperatures that can burn skin.
- · Remove debris with fingers only; never use a knife near the roller or head.
- · Do not unplug a data link mid-job — it can corrupt the data stream and leave the queue stalled.
Prevent the Next Failure
Nearly every fault in this guide is cheaper to prevent than to resolve mid-shift. These habits matter more than any single maintenance task.
Match the adapter to the model
A marginal supply passes at idle and fails mid-receipt, which reads as an intermittent fault.
Label every cable
A labeled data and power cable turns a future fault into a two-minute check.
Reserve the printer address
An address change after a router restart silently breaks the print queue.
Hold a spare roll and cable
A spare roll and a spare cable eliminate most same-day downtime.
When replacement is the better answer
A printer that requires constant resetting, jams repeatedly within a shift, or has already had a board or cutter replaced is costing more in lost lane time than a replacement unit.
Volume and lane criticality decide whether a site holds a spare printer or a spare terminal. Where a single lane is the whole business, keep a spare; where a site runs many lanes, a service contract is usually cheaper. If the print head is firing but the paper stays white, work through receipt printer blank paper instead, or browse the full troubleshooting index.
Related Troubleshooting Guides
If the self-test points at a specific layer, the dedicated guide below takes it from there.
Complete POS Printer Diagnostic Guide
The full six-layer method, with the error light codes that identify the faulty subsystem in seconds.
Receipt Printer Printing Blank Paper
When paper feeds normally but nothing appears — thermal side orientation and paper stock.
Cash Drawer Will Not Open Automatically
The drawer is driven through the printer, so one fault can produce both symptoms.