Anytone At5555n Ii Service Menu Work
Accessing the service menu on the Anytone AT-5555N II Go to product viewer dialog for this item.
allows you to adjust internal alignment settings such as power levels and modulation. How to Access the Service Menu
To enter the service menu, follow these steps while the radio is OFF: Press and hold the MENU and MODE buttons simultaneously. Turn the radio ON while continuing to hold those buttons. Release the buttons once the radio powers up.
Immediately press the remaining front-panel buttons in sequence, starting from DW and moving right toward EMG (DW, RB, NB, SCAN, MEM, EMG).
The screen should display "FM" (factory menu) to indicate you have entered the service mode. Navigating and Adjusting Settings
Scroll: Use the Channel Selector knob to move through the menu items (there are approximately 53 individual settings).
View Values: Some settings require you to key the microphone (press PTT) to see the current stored numerical value.
Change Values: While holding the PTT key on the microphone, rotate the Channel Selector to adjust the value.
Save: Power the radio OFF and then back ON to save your changes and return to normal operation. Common Service Menu Items Users often access the menu to fine-tune the following: Item #16: AM High Power (AM Hi Pwr). Item #17: AM Low Power (AM Lo Pwr). Items #19 & #20: AM Modulation settings.
Alignment Codes: You may see codes like bfC (BFO frequency), loC (local oscillator offset), and fr0-fr9 (fine-tuning limit voltages). ⚠️ Critical Warning
No Factory Reset: There is no master reset for the service menu. Performing a standard radio reset (holding FUNC + SCAN) will not restore these alignment values to factory defaults.
Document Everything: Before changing any value, write down the original factory setting for every item. If you make a mistake without recording the original numbers, you may permanently decalibrate your radio.
Use a Dummy Load: Always connect the radio to a dummy load or a properly tuned antenna before making adjustments in the service menu to avoid damaging the transmitter.
To access the service menu on the AnyTone AT-5555N II , follow the specific button sequence below. Note that this "hidden" menu is used for internal hardware alignment and calibration; changing these values without a frequency counter or signal generator can significantly degrade your radio's performance. Google Groups Service Menu Access Turn the radio OFF. hold the FUNC button while turning the radio Immediately press the following buttons in sequence: The display will change to show internal alignment codes. Google Groups Common Service Menu Codes
Once in the service mode, you can scroll through settings by pressing the button and adjust values using the Google Groups
: Adjusts the reference frequency for the 10.24MHz BFO (Beat Frequency Oscillator). : Controls the local oscillator offset. fr0, fr4, fr5, fr9
: Used for fine-tuning the voltage limits for specific frequency steps (e.g., .00, .04, .05, .09).
: Specifically found in some versions to control modulation/audio levels (can be increased up to 63 for maximum audio). Standard Reset & Expansion
If you need to revert the radio to default or expand it for 11-meter use: Full Reset FUNC + SCAN while powering on. Frequency Expansion FUNC + EMG
while powering on, then use the channel selector to switch between "BAND 1" and "BAND 2" (Export Mode). Google Groups Important Safety Warning write down your original factory values anytone at5555n ii service menu work
before making any changes. These values are unique to each individual radio's hardware components. functions or instructions for the PC programming software Anytone 5555n Ii Service Menu - Google Groups
The Anytone AT-5555N II service menu is a powerful, hidden feature set used primarily for internal alignment, power adjustments, and signal fine-tuning. Unlike the standard user menu, this interface contains roughly 59 individual settings that directly control the radio's hardware parameters. Accessing it requires a precise power-on sequence and specific button combinations. How to Access the Anytone AT-5555N II Service Menu
To enter the service mode, you must follow a strictly timed sequence immediately upon powering the unit:
Preparation: Ensure the radio is connected to a dummy load or a well-tuned antenna.
Initial Key Press: Press and hold both the [MENU] and [MODE] buttons simultaneously while turning the radio on.
Timed Sequence: All LCD segments will light up for approximately two seconds. Within this window, release the first two buttons and immediately press the following buttons in exact order: [RB], [NB], [SCAN], [MEM], and [EMG].
Verification: If successful, the display will change to show the service menu items (e.g., beginning with modulation modes or specific channel codes like "FM" or "01"). Service Menu Operations
Once inside the service menu, navigation and adjustments differ from standard operation:
Scrolling: Use the Channel Selector (VFO knob) to scroll through the roughly 53–59 available parameters.
Viewing Values: Key the microphone (PTT) to view the currently stored data for a specific menu item.
Changing Values: To adjust a value, hold the PTT button and rotate the Channel Selector up or down.
Saving & Exiting: Turn the radio off to save your changes and exit the service mode. Key Service Menu Settings & Calibrations
While many of the 59 settings remain undocumented officially, experienced users have identified several critical functions: Parameter Code Common Function User Adjustment Notes CH-52 (RFG) RF Gain Adjustment
Often set to ~86 by default. Increasing it (e.g., to 105) can help mitigate "S7 noise" issues reported on some newer units. loC / bfC Oscillator Offsets
Used for local oscillator and BFO alignment to fix "off-frequency" reception in USB/LSB modes. fr0, 4, 5, 9 Fine Tuning Limits
Controls the voltage limits for fine-tuning increments (e.g., .00, .04, .05, .09). IC9 Modulation Level Can be increased (up to 63) to boost transmit audio punch. Critical Precautions
Write Everything Down: There is no factory reset button for the service menu. You must manually record every original value before making changes.
Hardware Risks: Improper adjustments can lead to unstable oscillators or damaged components if transmit power levels are set beyond safe thresholds.
Frequency Expansion: For general frequency "unlocking" (expanding bands), use a different shortcut: hold [FUNC] and [EMG] while powering on to toggle between BAND 1 and BAND 2. Anytone 5555n Ii Service Menu - Google Groups Accessing the service menu on the Anytone AT-5555N
AnyTone AT-5555N II service menu is an undocumented feature primarily used for fine-tuning frequency alignment and modulation. While users report it is effective for resolving specific issues like "S7 noise" on the S-meter, it is generally considered complex and carries a risk of misaligning the radio if not done carefully. Google Groups Service Menu Performance & User Feedback Audio Modulation Improvements
: Users have successfully used the service menu (specifically the
setting) to increase modulation levels from the factory default of 31 up to 63 for "full audio". Addressing S-Meter Noise
: A common complaint for newer units is a high base noise floor (S5-S7) even with no signal. Adjusting the
(RF Gain) setting in the service menu (typically around value 105) has been noted as a working fix by some operators. Precision Alignment
: The menu allows for individual alignment of the local oscillator ( ) and beat frequency (
) for different modes (FM, USB, LSB). Experienced users recommend adjusting first to get as close as possible before tweaking for final steps to preserve other mode settings. Google Groups How to Access the Service Menu
Accessing this menu requires a specific sequence that is not found in the standard manual. Preparation
: Turn the radio off. Ensure all switches are in the upper position except for NB/ANL, which should be set to Activation : Press and hold both the buttons simultaneously while turning the radio on.
: Release the buttons and quickly press the following keys in order: RB, NB, SCAN, MEM, EMG Navigation Channel Selector to scroll through menu items (e.g., CH-52 for RFG). Key the to view the stored value and hold while rotating the VFO to change it. Service Menu vs. Standard Background Menu For most common adjustments, the standard Background Function Menu is safer and more accessible. Bob's CB Radio : Long press [MENU] for 2 seconds. Common Settings : Configure (levels 1-36), SWR Protection SSB Clarifier Bob's CB Radio
There is no official documentation for service menu settings. It is highly recommended to record original values
before making any changes, as a factory reset may not restore these specific internal alignments.
of known setting codes for frequency alignment or instructions for the PC programming software Anytone 5555n Ii Service Menu - Google Groups 24 Jul 2024 —
To access the Anytone AT-5555N II service menu, you must press and hold the MENU and MODE buttons while turning the radio on, then quickly press the remaining top-row buttons (DW, RB, NB, SCAN, MEM, and EMG) in order.
This "Main Boot-up Service Menu" is distinct from the standard user settings menu and is used for internal hardware alignments, such as power output and frequency fine-tuning. Important Warning
There is no factory reset for these specific service menu settings. Before changing any values, you must write down every original number. Improper adjustments can permanently degrade your radio's performance or cause hardware damage. Service Menu Operations
Once you have entered the menu, use the following controls to navigate and adjust:
Navigation: Rotate the Channel Selector knob to scroll through the roughly 53 available menu items.
Viewing Values: To see the current stored value for a selected item, press and hold the PTT (Push-to-Talk) button on the microphone. Part 6: Saving Your Work and Exiting Unlike
Adjusting Values: While holding the PTT button, rotate the Channel Selector to change the value.
Saving and Exiting: Once your changes are complete, simply power cycle (turn off and back on) the radio to store the new settings. Commonly Adjusted Settings
While specific item numbers can vary slightly by firmware version, users on platforms like WorldwideDX Radio Forum have identified these key parameters: Description #16 AM High Power Adjusts the maximum "dead key" for AM mode. #17 AM Low Power Adjusts the minimum "dead key" for AM mode. #19 & #20 Modulation
Controls AM modulation swing; some users reset these to "0" for better RMS swing. bfC, loC, fr0-9 Alignment
Advanced settings for BFO and local oscillator offsets to correct frequency drift on SSB.
For less invasive adjustments like Roger Beep or Squelch levels, it is safer to use the standard Background Function Menu, accessed by holding the FUNC key for two seconds during normal operation.
This guide focuses on the "Engineer" service menu, which offers granular control over RF performance, far beyond the standard user settings.
Part 6: Saving Your Work and Exiting
Unlike older radios (like the Galaxy 959 or Uniden 980), the AT-5555N II service menu does NOT save changes automatically.
To save: After adjusting a parameter (e.g., P-32), you must press and hold the "FUNC" button for 2 seconds. The screen will beep or flash, confirming the write to EEPROM.
To exit: Power off the radio completely. Wait 5 seconds. Power on normally. Your changes are now active.
To verify: Test the radio with a wattmeter, frequency counter, or on-air friend before closing the chassis.
Service Menu Procedure — AnyTone AT-5555N II
Troubleshooting and diagnostics
- Symptom: Low TX power — check PA bias, antenna connector, output transistor, and RF relay.
- Symptom: Frequency drift — check VCO trim, PLL loop filter, and crystal/TCXO stability.
- Symptom: Distorted audio — check mic gain, compression settings, and audio path components.
- Symptom: Intermittent RX — check squelch thresholds, IF alignment, front-end components.
Inside the Chip: A Deep Dive into the AnyTone AT-5555N II Service Menu
The AnyTone AT-5555N II is regarded by many as the last "real" CB radio. While its front-facing user interface offers a basic menu, the true capability of the radio lies hidden behind a key combination known to technicians but rarely explored by the average operator.
Welcome to the Service Menu. This is where the hardware meets the software, and where you can tune your rig from a "stock radio" into a precision communication device.
Conclusion
The anytone at5555n ii service menu work is not a magic factory reset—it is a sophisticated calibration toolkit. By understanding parameters like rEF, PA-H, and Pc-H, you can restore drifting radios, optimize modulation for contesting, and ensure your signal is clean and on-frequency.
Remember the golden rule of service work: Measure twice, adjust once. Keep a log, use a dummy load, and your Anytone will reward you with years of professional-grade performance.
Have you performed a calibration on your AT-5555N II? Share your before/after frequency drift numbers in the comments below!
Disclaimer: Modifying your radio may void the warranty and violate local transmission laws (especially Part 95 for CB use). Always operate within your license privileges.
The Risk: Why "Work" Requires Caution
Here is the essential warning: Do not enter the service menu unless you have a calibrated oscilloscope, a frequency counter accurate to 1ppm, a 50-ohm dummy load, and an RF power meter. 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.
The most common reason people seek out the service menu is to "open up" the radio for out-of-band transmit (e.g., 26-28 MHz or 24-30 MHz). However, on the AT-5555N II, the service menu does not typically contain the band edge limits. Those are often set via a separate software programming cable and PC utility (like the RT Systems software or the free "AnyTone AT-5555N II Editor"). Confusing the two has led many users to incorrectly tweak the reference oscillator, thinking they were expanding coverage, only to end up with a radio that transmits on 27.000 MHz when the dial says 27.200 MHz.
