Registers, KDS, drive-thru headsets, and payment terminals.
| Symptom | What it usually is | Do this |
|---|---|---|
| Register shows offline | Upstream link flap | It keeps taking cards store-and-forward for up to 4 hours. Do not reboot mid-shift — open a ticket. |
| KDS screen frozen | Display controller hang | Hold the bezel power button 10 seconds, wait 30, power on. Fired orders recover from the controller. |
| Drive-thru headset drops | Base station channel conflict | Re-pair one headset at a time, not all at once. |
| Card declined, code 51 | Issuer-side decline | Not a terminal fault. Ask for another form of payment. |
| Shared terminal PIN lost | Expired shared credential | Reset through IT Helpdesk. A manager cannot reset it. |