Here is the essential warning: Unlike the service menu of a Yaesu or Icom, the AT-5555N II’s menu lacks a "Factory Reset" option. If you mistakenly set the PLL reference to an extreme value, the radio will not lock onto any frequency. If you max out the ALC, your transmit signal will become a distorted, splattering mess.
Alternative Method : Some versions use a sequence of pressing all 6 buttons from to EMG after the initial boot. Key Settings and Navigation
Let’s tackle three real-world "service menu work" scenarios.
For standard operational changes like Roger Beeps or SWR protection, it is safer to use the AnyTone PC Programming Software rather than the hidden service menu.
Accessing the service menu on the Anytone AT-5555N II Go to product viewer dialog for this item. anytone at5555n ii service menu work
Technicians use this menu to align the radio digitally without opening the chassis to turn physical tuning coils or potentiometers. Critical Safety Warning Before You Begin
Accessing this engineering level allows you to align the radio, adjust specific parameters, and fine-tune performance without opening the chassis. Warning and Disclaimer
while turning the power on. This defaults the frequency range to 25.615–28.305MHz. Warning: Use with Caution
The service menu interacts directly with the transceiver's firmware to regulate hardware performance. Unlike consumer settings like backlight color or key beeps, the service menu controls core operational voltages and frequencies. Here is the essential warning: Unlike the service
The master reference oscillator dictates the frequency accuracy of all modes (AM, FM, USB, LSB). If your radio reads 28.400 MHz on the screen but transmits on 28.400.3 MHz, the reference frequency needs adjustment. Tuning this service parameter shifts the internal master clock until the transmitted carrier matches your frequency counter exactly. 2. RF Power Output Alignment (TX Power)
Operators typically look for service menu work to resolve specific hardware misalignments. Over time, components age, temperatures fluctuate, and reference oscillators can drift. The service menu provides a software-based method to realign the radio without opening the chassis to turn physical tuning coils. Prerequisite Equipment for Calibration
Elias picked up the mic, his thumb hovering over the transmit bar. "Breaker one-nine, this is the Night Owl. You got your ears on, Big Mike?"
The is not magic—it is engineering. By understanding the map of P-codes, respecting the dangerous parameters, and methodically adjusting values with proper test equipment, you can transform a "good" radio into a "great" radio. Alternative Method : Some versions use a sequence
If your radio starts behaving erratically after you've made changes, follow these steps:
Entering the service menu on the AT-5555N II is not a simple button press. It requires a deliberate sequence, a holdover from the radio's lineage (originating from the Qixiang/AnyTone design family). To access it:
AnyTone AT-5555N II is a popular high-performance 10-meter radio, known for its extensive customization options. While the standard menu allows for basic adjustments, the (also known as the hidden or alignment menu) provides deep access to critical calibration settings like power levels and modulation. Critical Warning: Read Before Proceeding
Setting the TX power values to maximum will not turn the radio into an amplifier. It will simply saturate the circuit, cause severe splatter across adjacent channels, distort your audio, and rapidly burn out the final FETs.