HP 3150 EN - Manual (Page 199)

EN Softswitches 197
Softswitches
Any time the RFI shield is removed from the product, or when
softswitches are reset to defaults, the country code softswitch must
be reset.
Extended service mode allows you to change softswitches on the
product. A softswitch is a set of one to eight bits (a sequence of eight
1's and 0's), as needed. See the software technical reference for a
complete list of softswitches.
To change the country code softswitch
1 Enter Backspace#** to access the extended service menu.
2 Press < or > until Memory/Softswitches appears below Service
on the control panel.
3 Press the Enter/Menu .
4 If Softswitches does not appear below Memory/Softswitches on
the control panel, press < or > until it appears.
5 Press Enter/Menu .
6 Use the keypad to enter 101 (the “country code” softswitch).
7 Press Enter/Menu .