Anytone At-5555n Ii Service Menu 〈CERTIFIED · 2024〉

Introduction

The Anytone AT-5555N II is a popular amateur radio transceiver that offers a range of features and functionalities. To access advanced settings and configuration options, users can enter the service menu.

Entering the Service Menu

To enter the service menu on the Anytone AT-5555N II, follow these steps:

  1. Turn on the radio.
  2. Press and hold the "MENU" button while turning the dial clockwise until the display shows "Service Menu".

Service Menu Options

The service menu provides access to various configuration options, including:

  • TX Power Setting: Adjusts the transmitter power output.
  • RX Sensitivity Setting: Adjusts the receiver sensitivity.
  • Frequency Stability Setting: Adjusts the frequency stability.
  • Modulation Setting: Adjusts the modulation parameters.
  • Display Setting: Adjusts the display settings.

Caution

It's essential to exercise caution when navigating the service menu, as incorrect settings can affect the performance and functionality of the radio. Make sure to consult the user manual or seek guidance from a qualified technician if you're unsure about making changes.

Additional Resources

For more information on the Anytone AT-5555N II and its service menu, you can:

  • Consult the user manual.
  • Visit the manufacturer's website.
  • Join online forums or communities dedicated to amateur radio enthusiasts.

By understanding the service menu and its options, you can optimize your Anytone AT-5555N II for better performance and functionality. However, always exercise caution and seek guidance when making changes to the radio's configuration.

Anytone AT-5555N II Go to product viewer dialog for this item.

, like many advanced radio transceivers, contains a service menu used for factory alignment and calibration. This menu is intended for use by qualified technicians using specialized test equipment such as frequency counters, power meters, and signal generators. Understanding the Service Menu

The service menu allows for the adjustment of internal parameters that are not accessible through the standard user menu. These settings typically include:

Frequency Calibration: Aligning the reference oscillator to ensure the radio transmits and receives on the correct frequency. anytone at-5555n ii service menu

Power Levels: Setting the minimum and maximum output power for different modes (AM, FM, SSB).

Modulation Settings: Adjusting the modulation gain to ensure clear audio transmission within legal bandwidth limits.

S-Meter Calibration: Tuning the signal strength indicator for accuracy. Important Considerations

No Factory Reset: Most service menus do not have a "reset to default" option. Changes made are written directly to the EEPROM. If the original values are not recorded before adjustment, it can be very difficult to restore the radio to its factory state.

Regulatory Compliance: Transmitters are calibrated to meet specific legal requirements regarding frequency stability and bandwidth. Improper adjustments can cause the radio to operate outside of legal specifications, potentially causing interference with other services.

Hardware Risks: Making incorrect adjustments to power stages or bias settings can lead to overheating and permanent hardware failure. Recommended Best Practices

For those looking to optimize or repair a radio, it is recommended to:

Consult the Official Service Manual: The manufacturer's service manual provides the exact procedures and required test conditions for alignment.

Use a Dummy Load: Any testing involving transmission should be done into a dummy load to prevent unnecessary interference and protect the final transistors.

Seek Professional Service: If a radio is off-frequency or underperforming, a professional radio shop with the correct calibration tools can ensure the device is set to peak performance safely and legally.

The Anytone AT-5555N II service menu allows for deep internal alignment and calibration. Because there is no factory reset for these settings, it is vital to record every original value before making changes. 🛠️ Accessing the Service Menu To enter the service menu, follow these steps exactly: Ensure the radio is OFF.

Press and hold the MENU and MODE buttons simultaneously while turning the power ON.

All LCD segments will illuminate for approximately 2 seconds.

Within those 2 seconds, release the buttons and immediately press the following buttons in sequence: RB, NB, SCAN, MEM, EMG. Introduction The Anytone AT-5555N II is a popular

Alternative method: Some versions require holding FUNC while powering on, then pressing the other buttons in the top row (DW to EMG) in order. ⚙️ Navigation and Controls

Scrolling: Use the Channel Selector or VFO knob to cycle through the menu items (there are typically around 53 parameters).

Viewing Values: To see the current numerical value of a setting, press the PTT (key the mic).

Changing Values: Hold the PTT and rotate the Channel Selector or VFO knob to adjust the value up or down.

Saving/Exiting: Power cycle the radio (turn it off and back on) to save settings. 📝 Common Service Menu Parameters

While documentation is limited, users have identified several key settings: CH-52 RFG

Often used to reduce high background noise (S5-S7) present on some units. bfC, fr0-fr9 Frequency Alignment

Used to calibrate the carrier frequency for different modes (USB, LSB, CW). AM Modulation AMC / Modulation

Adjusts the clamping level; smaller values typically equal higher modulation. ⚠️ Critical Warnings

No Factory Reset: Performing a standard CPU reset (FUNC + SCAN at power on) will not restore service menu values to factory defaults.

Record Everything: Always write down every value for all 50+ menu items before changing anything. If you lose your original settings without a backup, the radio may require professional realignment with a signal generator.

Equipment Required: Many frequency-related settings (like fr0) should only be adjusted while using a high-precision frequency counter or signal generator. Anytone 5555n Ii Service Menu - Google Groups

Why Does a Service Menu Exist?

Before we type a single button combination, it is crucial to understand why this menu exists. The AT-5555N II is a precision analog/digital hybrid radio. Over time, temperature changes, component aging, or minor manufacturing tolerances can cause deviations in:

  • Frequency accuracy (The displayed frequency vs. actual transmitted frequency).
  • Transmit power (High power vs. Low power levels).
  • Modulation depth (AM/FM/SSC).
  • S-meter calibration (How accurately the radio reads incoming signal strength).

The service menu allows a technician to digitally trim these values without soldering iron or variable capacitors (trimmers). It is not intended for daily driver adjustments to "squeeze more power" out of the radio. Turn on the radio

5.4 VCO Voltage

  • Parameters: VCO Low, VCO High.
  • Function: Monitors the lock voltage of the Phase Locked Loop. While usually read-only or factory-set, these values ensure the synthesizer can lock across the entire frequency range.

Short how-to story: Accessing the Anytone AT-5555N II Service Menu

Tom needed to tweak his Anytone AT-5555N II handheld for better performance on a local repeater. He wasn’t a radio tech, but he wanted a safe, reversible change — nothing that would void warranty or break the radio.

  1. Preparation

    • Tom fully charged the radio and set aside a quiet, well-lit workspace.
    • He downloaded the official user manual and saved his current CPS (programming software) configuration file to his computer so he could restore settings if needed.
    • He wrote down his radio’s firmware and hardware version from the CPS screen.

  2. Entering service menu (safe approach)

    • Tom powered off the radio.
    • He held both the PTT and MONI (monitor) buttons while powering the radio on to enter a maintenance/service-like mode (note: specific key combos vary by model and firmware; consult the manual first).
    • The radio showed a special menu with versions and adjustable parameters. Tom navigated slowly, only viewing items he could identify: calibration values, battery calibration, and display contrast.

  3. What Tom checked (and what he avoided)

    • Checked firmware and hardware versions to confirm compatibility with the CPS and any available firmware updates.
    • Looked at battery calibration numbers and contrast — safe, reversible changes.
    • Avoided altering RF power stages, TX/RX calibration offsets, or RF alignment values without professional equipment and documentation.
    • Did not change anonymous ID or serial-related fields.

  4. Making a safe change

    • Tom adjusted display contrast and the key beep volume for comfort.
    • He saved the configuration, then exported the new CPS file to his computer.

  5. Testing and rollback

    • He tested transmit and receive on known simplex frequencies at low power.
    • Everything worked; if something had been wrong, Tom was ready to re-import his original CPS file and reboot the radio.

  6. Final notes and best practices

    • Always back up existing settings before entering service menus.
    • Only change parameters you understand; the service menu can contain calibration and RF settings that require specialized tools.
    • Use manufacturer documentation and firmware from official sources.
    • If unsure, contact an authorized service center.

If you want, I can:

  • Provide the exact button sequence for your firmware version (I’ll assume a common combo unless you give the firmware/hardware version), or
  • Draft a step-by-step checklist you can print and follow.

⚠️ Disclaimer: The service menu contains critical calibration data. Incorrect settings can render the radio inoperable, cause it to transmit on illegal frequencies, or violate FCC/Ofcom regulations. Proceed at your own risk.

How to Enter the AnyTone AT-5555N II Service Menu

Unlike older analog radios with physical potentiometers, the AT-5555N II uses a digital encoder and button combination.

Follow these steps precisely:

  1. Power off the radio completely. (Remove DC power or use the front power button until the screen goes dark).
  2. Press and hold the FUNC (Function) button.
  3. While holding FUNC, press and hold the BAND button.
  4. While holding both FUNC and BAND, power on the radio (press the PWR button).
  5. Release all buttons.

If successful, the display will change. Instead of showing a channel or frequency, you will likely see something like "S-01" or "R-01" on the screen, or a parameter code like "POWER HI".

Note: On some firmware versions, the entry method may be slightly different (e.g., holding LCR/MODE instead of BAND). If the above fails, try FUNC + MODE + Power.