Entering radio security code
Mike - this is taken straight from the manual - I hope it helps:
1. Activate PROG mode
Hold the “PTY” key pressed until you hear the confirmation signal
2. Selecting and activating the CODE function
Briefly press the < or > keys to select the CODE function.
Briefly press the “PTY” key. “1000” will flash on the display screen
3. Enter security code
Enter the Radio Card code number by repeatedly pressing the "1" to "4" keys until the correct number is displayed on screen.
By pressing key "1" you enter the first digit, with "2" the second,.,.
By briefly pressing the key for a particular number, you increase the value by one unit. (After "9", "0" will show up again).
By holding the number key pressed you decrease its value by one unit.(After "0", "9" will show up again).
Example: if entering number 1703.
Do not press key "1" as this number is already correctly entered, as the screen displays "1000*.
Press key "2" seven times, "1700" will be displayed.
Do not press key "3" as this number is already correct. "1700" is displayed.
Press key "4" three times. "1703" will be displayed.
4. Confirm the security code entered.
Briefly press the "PTY" key. "SAFE" will be displayed.
5. Exit PROG mode.
Hold the "PTY" key pressed until you hear the confirmation signal.
Waiting Intervals:
ln order to avoid code deactivation with the test and error procedure, we have introduced a waiting interval of one hour after every faulty try. During this period we can switch the set on and off but it will remain silent. During the waiting interval the set must remain on. Until the interval time is not over "2 SAFE" is displayed on the screen. After this time the next try number will be displayed, for instance: "2 1000".