At5555n Ii Service Menu Updated: Anytone

Anytone AT-5555N II — Service Menu Updated

I've updated the service menu reference for the Anytone AT-5555N II radio to make routine adjustments and troubleshooting easier. Use this as a quick guide — be careful: changing service-menu items can affect radio performance. Only proceed if you know what each setting does.

Recommended Alternative

If your radio has performance issues (off frequency, low power, distorted audio), do not attempt DIY alignment. Instead:

✅ Send to a qualified CB/ham radio technician with a service monitor
✅ Contact AnyTone/Retevis support for official firmware or alignment software (some models use PC software via USB)
✅ Check if your radio just needs a factory reset (usually via menu option or holding two buttons on power-up)

Recommended Values & Tips

• TX Power: Keep within FCC/region-legal limits. Use the radio’s rated power as a starting point.
• Mic Gain: Set so audio peaks without clipping; verify with another receiver for clarity.
• PLL/Frequency: If transmit/receive offset is >1–2 kHz, recalibrate with proper equipment.
• Battery Charge: Match charger specs to battery chemistry (Li-ion vs NiMH).

The Updated Entry Method (2024/2025 Firmware)

Older YouTube videos might show an old button sequence that no longer works on newer firmware revisions. If your radio has the latest software (usually found in units built after mid-2024), here is the updated procedure:

1. Power off the radio completely.
2. Press and hold the following two buttons simultaneously:
   • FUNC (Function)
   • NB/ANL (Noise Blanker)
3. While holding those two, power on the radio.
4. Wait for the boot screen to finish, then release the buttons.

If that doesn't work, try the secondary method used on some production runs: anytone at5555n ii service menu updated

1. Power off.
2. Hold FUNC + BAND.
3. Power on.

You will know you are successful if the screen changes to a black background with white text, showing hex addresses (e.g., 1. 0x00A: 128).

Frequently Asked Questions (Updated)

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.

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. Anytone AT-5555N II — Service Menu Updated I've

1. Abstract

The Anytone AT-5555N II is a popular 10-meter amateur radio transceiver. Unlike its predecessors, the "N II" revision utilizes varying hardware revisions (PCB versions) that dictate specific service menu entry methods. Users attempting to align these radios using legacy instructions (from the original AT-5555 or AT-5555N) may find discrepancies in frequency coverage or menu accessibility. This paper outlines the updated service menu access codes and the critical alignment parameters required for restoring performance after component replacement or frequency expansion.

Common Issues & Fixes in the Updated Menu

Users on modern firmware have reported specific quirks. Here is how the updated service menu solves them:

Problem: "My AM carrier is too high (10 watts), but the radio is set to low power." Solution: Go to P-07 (High Power Scale). Reduce the value from 120 to 85. This digitally reduces the drive voltage to the RD16HHF1 finals. Do not exceed 120.

Problem: "The S-meter shows S9, but the signal is actually S5." Solution: Go to P-09. Key a known S9 signal (or use a signal generator at -73dBm). Adjust the value until the meter reads S9. Recommended Values & Tips

Problem: "My SSB audio sounds distorted on the air." Solution: The updated firmware adds ALC clamping. Go to P-05 (SSB ALC). Reduce from 95 to 85. This cleans up sideband audio significantly.

Safety & Compliance

• Don’t exceed legal transmit power for your region.
• Use correct battery and charging settings to avoid fire risk.
• If unsure, consult a certified technician or the manufacturer.

3. Hardware Variants: The "Old" vs. "New" Board

A critical source of confusion regarding the AT-5555N II service menu is the hardware revision. Anytone updated the main PCB during the production run.

• Old Version (Legacy): Uses the standard entry method found in early AT-5555 manuals.
• New Version (Updated): Often requires a different entry sequence or features a "Quick Menu" system integrated into the normal user interface.

Identification: Check the rear serial number label or the internal PCB silkscreen.

• Some newer models hide the expanded frequency settings behind a "Band" button combination rather than the traditional service mode.
• Recent firmware versions (often found in CRT SS 7900 models) utilize a "User Menu" vs. "Service Menu" split.