- Verify that the cord has screws holding it in place.
- Power cycle (reboot) the terminal by pressing and holding CLEAR and – (minus) simultaneously on the iSC250 payment terminal.
- When the iSC250 reboots and the grey Retail Base screen appears, press 2 6 3 4 and ENTER.
Note: There is a small time window for you to enter the numbers above. If you do not enter these numbers within this time window, the device will finish the reboot, and you will have to start the calibration process again.
4. Press the + (plus) to display the functions menu.
5. Press 0 for Telium Manager.
6. Press 3 for Initialization.
7. Press 2 for Hardware.
8. Press 4 for Calibration. A message will state that the feature is not available. Ignore this message and move on to the next step.
9. Press 7 5 8 1 and ENTER to re-calibrate the payment terminal. You will get a message saying "Calibration successful."
10. Reboot device (hold CLEAR and – (minus) simultaneously) to exit function menu.
Note: If your iSC 250 is loaded with RBA 21 or above, you do not need to enter the 7581 code in step 9. Use +/- to select the Yes option and press ENTER instead.
