Anytone At5555n Ii Service Menu Updated

Older versions of the AT5555N (the first generation) had a notoriously simple, albeit limited, service menu. However, with the "N II" revision and subsequent firmware patches (Version 2.0 and higher), AnyTone has expanded the service menu to include:

Warning: Entering the service menu voids your warranty if you aren't a certified technician. Power adjustments can damage your final transistors if done improperly. Proceed at your own risk.

On some updated mainboards, the entry method has changed to prevent accidental entry:

Once in the Service Menu, navigation is straightforward: anytone at5555n ii service menu updated

To Exit the Service Menu, simply turn the radio off and back on again normally.

To ensure your hard work isn't lost:

Subject: Service Menu Access, Firmware Variants, and Hardware Alignment Platform: Anytone AT-5555N II / CRT SS 7900 / Intek H-520 Older versions of the AT5555N (the first generation)

Once inside:

Q: Why is the old "MENU + POWER" trick not working? A: The updated firmware (V2.0+) disabled that backdoor to prevent hamfisted adjustments. You must use the BAND+INFO method described above.

Q: Will resetting the radio (Factory Reset) reset the service menu? A: No. A standard factory reset (FUNC+INFO on power up) only resets user settings (channel memories, mic gain, RF power). The service menu parameters are stored in a protected EEPROM sector and remain untouched. You must manually revert changes. Warning: Entering the service menu voids your warranty

Q: I bricked my radio by adjusting P-01. Help? A: If the VCO unlocks, you will hear clicking. Turn the radio off. Open the case and look for the two VCO trimmer caps (TC1/TC2). If you didn't touch those, re-enter the service menu blindly (you may need a strong signal in the room to hear beeps) and set P-01 back to 2.5.

Veteran users will notice a few differences in the latest service menu revision: