Here are the steps to re-calibrate the Ingenico isc250 screen:
- Press and hold CLEAR and – (minus) simultaneously on the iSC250 payment terminal to reboot it.
Retail Base screen
- When the iSC250 reboots and the grey Retail Base screen appears, press 2 6 3 4 and ENTER. You will only have a short moment for this step. If you miss, start back at step #1.
- Press + 9 7 for Menu.
- Press 0 for Manager Menu.
- Press 0 for Telium Manager.
- Press 3 for Initialization.
- Press 2 for Hardware.
- Press 4 for Calibration.
- Press + for Yes.
- Press Green.
- DO NOT touch the device until is says Calibration Successful.
- Press Red until you get back to the home screen.