Performing a standard CPU reset (FUNC + SCAN at power on) will not restore service menu values to factory defaults.
To access the service menu on the AnyTone AT-5555N II, you must perform a specific sequence of button presses during power-on. This "hidden" menu is primarily used for alignment, such as fine-tuning the frequency or adjusting the Local Oscillator (LO) Google Groups Accessing the Service Menu the radio. Press and hold the button while turning the radio Immediately release and then press the next three buttons in quick succession: anytone at-5555n ii service menu
“I used the Service Menu to bring my AT-5555N II back to life after a failed mod. Reset the PLL reference and SSB ALC—now it’s the best-sounding radio in my shack.” — Mike, K6MRC Performing a standard CPU reset (FUNC + SCAN
All LCD segments will illuminate for approximately 2 seconds. Press and hold the button while turning the
Disclaimer: This article is for educational and informational purposes only. Modifying your radio may violate FCC or local telecommunications regulations. The author assumes no responsibility for damage to equipment or legal issues arising from the misuse of the service menu.
of powering on, release those buttons and quickly press the following sequence in order: (Roger Beep) (Noise Blanker) (Emergency) Important Considerations Calibration Settings
Some units ship with AM carrier set above 4W, causing over-modulation on certain amplifiers. Lowering HI-PWR to 3.5W allows headroom for clean 100% positive peaks.