Anytone At5555n Ii Service Menu Work ^hot^ Now

This guide focuses on the "Engineer" service menu, which offers granular control over RF performance, far beyond the standard user settings.

Accessing the service menu

1. Power off the radio.
2. Press and hold both the [VFO/MR] and [A/B] buttons (or the two front-panel soft keys marked for mode and function) simultaneously.
3. While holding, power on the radio. Keep holding until the display shows “Service” or a menu of parameters.
4. Release buttons. Navigate with the channel selector knob and use [PTT] or [Menu/Enter] to select/confirm, depending on model specifics.

(Note: Exact button names may vary; consult AnyTone AT-5555N II hardware labeling. If these steps fail, the radio may require an alternate key combo or a firmware debug cable.) anytone at5555n ii service menu work

Step-by-Step Access:

1. Power off the radio completely. Disconnect any programming cables.
2. Press and hold the following three buttons simultaneously:
   • CLAR (Clarifier)
   • DW (Dual Watch)
   • A/F (Audio Filter)
3. While holding these three buttons, power on the radio.
4. Release the buttons once the screen lights up.

If successful, you will not see the standard channel display immediately. Instead, you will see a numeric value (usually representing software version) and you will be in a menu mode where the main encoder changes Menu Items (P01, P02, etc.). This guide focuses on the "Engineer" service menu,

Verification: Turn the "Freq/CH" knob. If the top line displays codes like P-01, P-02, up to P-65 (depending on firmware version), you are inside the Service Menu. Accessing the service menu

Recommended procedure for common tasks

• Before: Backup current configuration using CPS (Customer Programming Software) and note firmware/hardware versions.
• Calibration setup: RF power meter, dummy load, spectrum analyzer or deviation meter, stable frequency reference, dummy antenna load, multimeter, and temperature-stable environment.
• Adjust TX power:
  1. Connect radio to dummy load and RF power meter.
  2. Enter service menu → TX Power Calibration.
  3. Change one power step at a time, measure, and record.
  4. Reboot and verify on-air behavior at permitted power levels.
• Adjust modulation/deviation:
  1. Connect deviation meter or spectrum analyzer.
  2. Transmit test tone at specified level (e.g., 1 kHz, 1 kHz deviation reference).
  3. Adjust Modulation Gain until deviation matches spec.
• VCO/PLL trim:
  1. Use frequency standard and-spectrum analyzer/receiver.
  2. Adjust offsets to minimize carrier error across band.
• PA bias:
  1. Monitor PA current and temperature.
  2. Adjust bias in small increments and verify stability.

Part 2: How to Enter the Service Menu

The AT-5555N II uses a button combination sequence to unlock the hidden engineering parameters. Do not confuse this with the simple "Factory Reset" (hold FUNC + A/F while powering on). The Service Menu is deeper.

Why Do You Need the Service Menu?

Before we dive into the button combinations, let’s understand why you might need to perform service work on the AT-5555N II.

1. Frequency Drift: The TCXO (Temperature Compensated Crystal Oscillator) in the N2 is generally stable, but shipping or extreme temperature changes can knock it off center.
2. Modulation Flatness: Factory settings might prioritize safe limits over performance. You may want to slightly adjust AM modulation depth or SSB ALC (Automatic Level Control).
3. Power Output Trimming: Legal limits vary by region. You might need to lower power for an amplifier driver or raise it to factory specs (usually 60W PEP SSB / 40W AM).
4. Meter Calibration: The on-screen S-meter or power output meter might read incorrectly compared to a professional external meter.

Overview

The AnyTone AT-5555N II includes a hidden service menu used by technicians for calibration, diagnostics, and programming checks. This article documents how to safely access the service menu, common menu items and their meanings, recommended procedures, and safety precautions. Only qualified technicians should perform service-menu operations; incorrect settings can render the radio inoperable or violate regulatory rules.