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Food Truck POS: Battery, 4G and the 12V Printer

A food truck has no socket: it has a battery that also starts the engine, a steel box that blocks the signal and an alternator that is idle all day. Three numbers decide whether the till keeps working — watt-hours, decibels and the voltage at the printer’s plug.

POS Offline Mode: What Still Works When the Internet Drops

An outage is not one failure but four, and only one of them is the internet. What survives depends on where the catalogue and the sales queue are written — and on a test that takes fifteen minutes to run before a Saturday lunch service runs it for you.

Cash Drawer Won’t Open: The Pulse That Never Arrives

A kick-out pulse lasts 50 to 100 milliseconds, which is shorter than a handheld meter can resolve, so the port reads zero whether it is working or dead. The click test, the coil reading and the 60 W supply budget separate the three faults behind one complaint.

Barcode Scanner Reads Nothing: HID, COM and Keyboard Layout

A scanner that reads nothing is four faults sharing one description, and only one of them is hardware. The Notepad test splits them in a minute; the rest is HID reports, keyboard layouts, character timing and the three faults that COM mode swaps in.

Receipt Printer Not Printing: Four Checks Before You Call Support

A dead receipt printer is seven different faults wearing the same description. The self-test page splits them in half in twenty seconds; the other three checks cover paper, data link and the machine, with the numbers that tell you which one you have.

Direct Thermal vs Thermal Transfer: Choosing by Label Life, Not Price

The choice between direct thermal and thermal transfer is set by how long the label must survive and what it must survive. Here is where each one fails, and the arithmetic on ribbon yield.