AvalonMiner 1146 Maintenance & Repair Guide

Introduction

The Canaan AvalonMiner 1146 belongs to the A11 series — the generation that finally brought Canaan into serious contention with Bitmain for SHA-256 mining dominance. Released in late 2019 and shipping by early 2020, the 1146 delivers 56 TH/s of SHA-256 hashrate at 3192 W, yielding an efficiency of roughly 57 J/TH. That efficiency number will not win any awards in 2026, but the 1146’s real value lies in its architecture: Canaan’s A3206 16nm ASIC chip proved that there was more than one viable path to building reliable Bitcoin mining hardware, and thousands of these machines are still hashing across the world.

If you are a home miner running an AvalonMiner 1146 — whether for solo mining, pool mining, or as a heat source during Canadian winters — understanding this machine’s architecture is non-negotiable. The 1146 is not an Antminer. It uses a fundamentally different controller architecture (the external AUC3 controller and Raspberry Pi management module), a different connector system, different firmware, and different diagnostic interfaces. Antminer muscle memory will lead you astray here. This guide is written specifically for the AvalonMiner 1146 and its quirks.

Canaan designed the 1146 with a modular philosophy. The miner itself is essentially a compute-and-hash unit — it contains hashboards, fans, and a power distribution system, but the “brain” lives externally on the AUC3 (Avalon USB Converter) controller connected to a Raspberry Pi running the AvalonMiner Controller software (also known as CGMiner-based firmware). This design means you can daisy-chain multiple AvalonMiners off a single controller, which is elegant for multi-unit deployments but adds complexity compared to Bitmain’s all-in-one control board approach.

This guide is your complete field manual for keeping the AvalonMiner 1146 alive and hashing. We cover routine maintenance that prevents problems, diagnostics that identify them, and repair techniques that fix them. Every AvalonMiner you keep online is another node in the decentralized Bitcoin network — and at D-Central, we believe that network decentralization matters more than any spec sheet number.

Technical Specifications

The AvalonMiner 1146 is architecturally different from Bitmain’s Antminer lineup in nearly every way that matters for maintenance. The external controller model, the connector types, the hashboard layout, the power delivery — all of it is Canaan-specific. Before you touch a single screw, internalize these specs. Assumptions based on Antminer experience will get you into trouble.

A11 Series Variants

The 1146 is part of Canaan’s A11 generation. While this guide focuses on the standard 1146, the maintenance principles apply broadly across the A11 lineup:

All A11 variants share the same fundamental architecture: four A3206-based hashboards, external AUC3 controller, Raspberry Pi management module, and the same form factor. The differences come down to chip binning and operating frequencies. If you can maintain a 1146, you can maintain any A11-series AvalonMiner.

Understanding the Hashboard Architecture

Each AvalonMiner 1146 hashboard contains 72 A3206 ASIC chips arranged in a 12-row by 6-column grid. The chips are organized into groups connected in series, with multiple chips connected in parallel within each group. This is a fundamentally different layout from Bitmain’s domain architecture, and understanding it is critical for diagnostics.

• Power delivery: The PSU supplies 12V DC to each hashboard through 2×7-pin connectors. Voltage regulators, capacitors, and other power supply components on the board regulate power to multiple rails — Vcore, VTOP, and VDDIO — which supply different parts of each A3206 chip.
• CK (Clock) signal: Generated at 25 MHz, this is the working clock for each chip. It maintains timing for operations and coordinates data processing across the chip chain.
• C (Clock Transmit) signal: Operating at 5 MHz, this signal synchronizes operations across all chips in the chain. It is transmitted from chip to chip in series.
• R (Reset) signal: The reset pin initializes and resets chips as needed, maintaining stability and preventing cascading errors during operation.
• D (Data) signal: Carries mining data and results between chips. Proper transmission of the D signal is essential for the hash chain to produce valid work.

The signal direction flows in series through the chip groups. When a chip fails or a solder joint cracks, the signal chain breaks at that point — and every chip downstream of the break will stop producing valid work. Understanding this serial signal flow is the key to rapid fault localization on AvalonMiner hashboards.

Before You Begin

Safety Warnings

Routine Maintenance

Preventive maintenance is the difference between a miner that runs for years and one that dies in months. The AvalonMiner 1146’s four-fan, four-hashboard design generates significant heat and moves enormous air volume, which means it accumulates dust faster than you think. A disciplined maintenance schedule will maximize uptime and extend the operational life of your investment.

Recommended Maintenance Schedule

Visual Inspection

Every maintenance session starts with a visual inspection. Power down the unit, unplug it, and wait five minutes for capacitors to discharge and surfaces to cool. Then systematically inspect:

• External chassis: Look for physical damage, bent metal, loose screws, or dents that might have impacted internal components. The 1146’s reinforcement design uses metal brackets and screws to secure components — check that these are tight and undamaged.
• Fan grilles and vents: Check for dust accumulation blocking airflow. Even partial blockage forces fans to work harder and raises operating temperatures.
• Cable connections: Verify that the AUC3 controller cable, ethernet cable (to Raspberry Pi), and all power cables are firmly seated. Loose connections are the most common cause of intermittent issues on AvalonMiners.
• PSU: Inspect the power supply for bulging capacitors, discoloration, burn marks, or unusual smells. A failing PSU can damage hashboards before showing obvious external symptoms.
• LED indicator: Note the current state of the front-panel LED. We cover LED codes in the diagnostics section, but as a quick reference: green = normal, red = error, blue = booting/updating, yellow = idle.

Cleaning Procedures

Dust is the silent killer of ASIC miners. It insulates heatsinks, clogs fans, and creates thermal hotspots that accelerate chip degradation. Here is how to clean an AvalonMiner 1146 properly:

External Cleaning (Monthly):

1. Power down and unplug the unit completely.
2. Use compressed air to blow dust out of the fan grilles from both the intake and exhaust sides. Blow from inside out when possible to push accumulated dust away from components.
3. Use a soft-bristle anti-static brush to dislodge any stubborn dust clumps around fan frames and vent openings.
4. Wipe the chassis exterior with a dry lint-free cloth. Never use water or liquid cleaners on the exterior near ventilation openings.

Internal Cleaning (Quarterly):

1. Power down, unplug, and wait at least 10 minutes for cooling.
2. Remove the chassis cover screws (Phillips #2) and carefully lift the top panel.
3. Ground yourself with an anti-static wrist strap attached to the chassis.
4. Use compressed air at moderate pressure to blow dust from hashboard surfaces, heatsink fins, and between components. Hold the can upright to avoid spraying propellant liquid. If using an electric blower, keep it on medium setting.
5. Pay special attention to the areas between hashboards — dust accumulates heavily in these gaps where airflow is constricted.
6. Clean fan blades individually. Hold each fan stationary with a finger while blowing air through it — letting fans spin freely under compressed air can generate voltage that damages the fan motor driver.
7. Inspect each 2×7-pin connector for dust, corrosion, or discoloration. Clean with IPA and a lint-free cloth if needed.
8. Reassemble in reverse order, ensuring all screws are seated but not overtightened.

Thermal Paste Replacement

The thermal interface material (TIM) between the A3206 chips and their heatsinks degrades over time. Dried, cracked, or hardened thermal paste causes localized hotspots that reduce chip lifespan and trigger thermal throttling. On a 1146 running 24/7, thermal paste should be inspected every six months and replaced annually at minimum.

Thermal paste replacement procedure:

1. Power down, unplug, and wait at least 15 minutes for full cooling.
2. Remove the chassis cover and ground yourself with an ESD strap.
3. Carefully disconnect the hashboard’s 2×7-pin connectors from the miner management board and PSU.
4. Remove the hashboard mounting screws and slide the board out of the chassis. The 1146’s reinforcement design means there may be additional bracket screws — note their positions for reassembly.
5. Gently separate the heatsink from the hashboard. If the old thermal paste has dried and bonded, use gentle twisting motions — never pry with a screwdriver, which can crack chips or damage PCB traces.
6. Clean old thermal paste from both the chip surfaces and heatsink surfaces using 99% IPA and lint-free cloths. Remove all residue completely.
7. Inspect the chip surfaces under magnification. Look for chips with discoloration (burned), cracks, or uneven surfaces. Flag any suspect chips for further testing after reassembly.
8. Apply fresh thermal paste (Arctic MX-5, Noctua NT-H2, or equivalent non-conductive paste) to each chip. Use the thin spread method — a razor-thin even layer across the entire chip surface. Too much paste is as bad as too little. You want complete coverage without excess squeezing out the sides.
9. Reattach the heatsink with even, firm pressure. Tighten mounting screws in a cross pattern (diagonally opposite corners) to ensure even pressure distribution.
10. Repeat for each hashboard.
11. Reassemble the unit, reconnect all connectors, and power on. Monitor temperatures for the first hour to confirm the thermal paste application was successful. Chip temperatures should drop 5–15°C compared to pre-replacement readings.

Fan Maintenance

The AvalonMiner 1146 uses four high-speed fans — two on each side of the chassis (intake and exhaust). Fan failure is one of the most common issues on any ASIC miner, and the 1146 is no exception. Fan bearings wear out, dust accumulates on blades causing imbalance, and cables develop fatigue from vibration.

Monthly fan checks:

• Listen for unusual sounds: grinding, clicking, rattling, or buzzing indicate bearing wear or blade damage.
• Monitor fan RPM via the AvalonMiner Controller dashboard. A fan showing significantly lower RPM than its neighbors (more than 15% deviation) is degrading and should be replaced preventively.
• Visually inspect fan blades for cracks, chips, or accumulated dust/debris.
• Check fan cable connections for secure seating and signs of heat damage at the connector.

Fan replacement procedure:

1. Power down and unplug the unit.
2. Remove the fan guard screws (usually four per fan) from the chassis exterior.
3. Disconnect the fan cable from the fan connector on the control/management board inside the chassis.
4. Slide the old fan out and insert the replacement. Ensure the airflow direction arrow on the new fan matches the original orientation (intake fans blow inward, exhaust fans blow outward).
5. Reconnect the fan cable and secure the fan guard screws.
6. Power on and verify the replacement fan reports normal RPM in the controller dashboard.

LED Status Indicators & Diagnostics

The AvalonMiner 1146 has a single multicolor LED on the front panel, next to the Ethernet port. This LED provides surprisingly useful diagnostic information if you know how to read it. Unlike Antminers with their red/green indicator scheme, the AvalonMiner uses four colors and multiple blink patterns.

LED Color Reference

Controller Dashboard Diagnostics

The AvalonMiner Controller running on the Raspberry Pi provides a web-based dashboard accessible via the Pi’s IP address. This is your primary diagnostic interface. Here is what to look for:

• Device detection: All four hashboards should appear as detected devices. If fewer than four boards show up, you have a connection, hashboard, or management board issue.
• Hashrate per board: Each board should report approximately 14 TH/s (56 TH/s ÷ 4 boards). A board reporting significantly less indicates chip failures or thermal throttling.
• Chip count: Each board should report 72 chips detected. Missing chips indicate dead chips or signal chain breaks.
• Temperature readings: Monitor both chip temperatures and PCB temperatures. Chip temps should be in the 60–85°C range under normal load. Consistently above 90°C means you have a cooling problem.
• Fan speed: All four fans should report similar RPMs. A fan reporting 0 RPM is dead. A fan reporting significantly different RPM from its neighbors is failing.
• Hardware errors (HW): Some hardware errors are normal in mining. If the HW error rate exceeds 2% of total shares over a sustained period, investigate that board.

SSH Diagnostic Commands

For deeper diagnostics, SSH into the Raspberry Pi controller. The AvalonMiner Controller is CGMiner-based, so you have access to the CGMiner API via the command line.

# Connect to the Raspberry Pi (default credentials: root/root)
ssh root@<raspberry-pi-ip>

# Check CGMiner status via API
echo '{"command":"summary"}' | nc localhost 4028

# Get detailed device stats
echo '{"command":"stats"}' | nc localhost 4028

# Check detected ASICs and chip counts
echo '{"command":"devs"}' | nc localhost 4028

# View pool connection status
echo '{"command":"pools"}' | nc localhost 4028

# Check individual device details (replace 0 with device number)
echo '{"command":"asc","parameter":"0"}' | nc localhost 4028

Multimeter Diagnostics

When the controller dashboard and SSH diagnostics point to a specific hashboard, the multimeter is your next tool. Here are the key measurements for AvalonMiner 1146 hashboard diagnostics:

• PSU output voltage: Measure across the PSU output terminals. Should read 12V DC (±0.5V). Below 11.5V under load indicates a failing PSU.
• Hashboard input voltage: Measure at the 2×7-pin connector on each hashboard. Should match PSU output. Significant voltage drop indicates cable or connector resistance.
• Resistance check (unpowered): Disconnect the hashboard and measure resistance across the main power input pins. A healthy board shows measurable resistance (not zero, not open). A near-zero reading indicates a short circuit. An open reading indicates a broken power trace.
• Signal continuity: Using the continuity mode, trace the CK, C, R, and D signal paths to identify breaks in the chip chain. This requires knowledge of the PCB trace layout and is considered an advanced diagnostic technique.

Common Repairs

Hashboard Not Detected

One or more hashboards not appearing in the controller dashboard is a common issue. The causes range from trivial (loose cable) to serious (dead board). Work through this diagnostic tree from simplest to most complex:

1. Check physical connections: Power down and reseat all 2×7-pin connectors between the hashboards and the miner management board. A connector that looks seated might have one row of pins not fully engaged. Push firmly until you feel the connector click into place.
2. Swap connector positions: If board 3 is not detected, swap its connector position with a known-working board. If the problem follows the board, the issue is on the hashboard itself. If the problem stays at the same connector position, the issue is on the management board or cabling.
3. Inspect the cable: Look for damaged, pinched, or corroded pins on the 2×7-pin cables. Even one damaged pin can prevent board detection. Replace the cable with a known-good spare if you have one.
4. Check the management board: Inspect the connector sockets on the miner management board for physical damage, bent pins, or burned traces around the socket. Management board failures are less common but do occur, especially after power surges.
5. Test the hashboard independently: If available, use a hashboard test fixture to power and test the suspect board in isolation. This eliminates all variables except the board itself.
6. Visual inspection under magnification: Examine the hashboard for visible damage — cracked chips, burned components, swollen capacitors, lifted traces, or cold solder joints. The A3206 chips are BGA packages, so solder joint failures are not always visible without magnification.

Low Hashrate

A 1146 reporting total hashrate significantly below 56 TH/s requires investigation. First, determine whether the issue affects all boards equally (system-level problem) or a specific board (board-level problem).

System-level causes:

• High ambient temperature: The A3206 chips throttle under thermal stress. If your room temperature is above 35°C, the miner’s AI chip will reduce frequencies to protect hardware. Improve cooling or ventilation.
• Insufficient voltage: If the PSU output has sagged below spec (under load), all boards will underperform. Measure PSU output under load — it should hold steady at 12V ±0.5V.
• Firmware issues: Outdated or corrupted firmware can cause performance degradation. Update to the latest stable version from Canaan.
• Network latency: High latency to your mining pool causes stale shares, which reduces effective hashrate. Check your pool connection and consider switching to a geographically closer pool server.

Board-level causes:

• Dead chips: If the controller reports fewer than 72 chips on a board, specific chips have failed. Each dead chip reduces that board’s contribution by roughly 0.78 TH/s (56 TH/s ÷ 72 chips). A few dead chips are acceptable; more than 5–8 suggests the board needs professional repair.
• Thermal throttling on specific board: One board running hotter than others (due to poor thermal paste, blocked airflow, or a failing fan on its side) will throttle independently. Check per-board temperatures and address the thermal issue.
• Connector resistance: A partially seated or corroded connector adds resistance, reducing power delivery to that board. Reseat or replace the connector.

Fan Failure

Fan failure on the 1146 triggers thermal protection within minutes. The four-fan design provides some redundancy — the miner may continue operating with a degraded fan, but at reduced performance and increased thermal stress. A completely dead fan should be replaced immediately.

Diagnostic steps:

1. Identify the failed fan from the controller dashboard (0 RPM reading) or by physical inspection (not spinning, unusual noise).
2. Check the fan cable connection. A disconnected cable is the simplest fix.
3. If the cable is connected, test the fan by swapping it with a known-working fan from another position. If the replacement works in the same position, the original fan is dead. If the replacement also fails in that position, the fan connector on the management board may be damaged.
4. Check fan voltage at the connector with a multimeter. You should see 12V DC. No voltage means a management board or wiring issue.

Replacement fans for the AvalonMiner 1146 should match the original specifications for airflow (CFM) and connector type. Using underpowered fans will result in insufficient cooling and thermal throttling.

Power Supply Issues

The Canaan PSU supplied with the 1146 is rated at 3,500 W and requires 220V AC input. PSU problems manifest as hashboard detection failures, low hashrate, unexpected shutdowns, or complete failure to power on.

PSU diagnostic checklist:

• No power at all: Check the wall outlet (plug in another device to confirm), inspect the power cord for damage, check the PSU fuse (if accessible), verify the power switch position.
• Intermittent power: Loose power cord connection, failing PSU capacitors, or an overloaded circuit (other high-draw devices on the same breaker). The 1146 draws roughly 14.5A at 220V — ensure your circuit can handle this sustained load.
• PSU output low: Measure output voltage under load. Below 11.5V indicates a failing PSU that should be replaced. Do not attempt to repair a PSU internally — high-voltage capacitors inside can kill you.
• Burning smell or visible damage: Immediately disconnect and replace. Never run a PSU with visible damage, bulging capacitors, or burn marks. The risk of fire is real.

Network & Controller Issues

Because the AvalonMiner 1146 relies on an external controller (Raspberry Pi + AUC3), network and controller issues are a category of problems that Antminer owners never encounter. Here are the most common scenarios:

• Raspberry Pi not reachable: Check that the Pi is powered and booted (activity LED should be blinking). Verify the Ethernet cable. Try a different Ethernet cable and port on your router/switch. If the Pi is unreachable, you may need to re-flash the AvalonMiner Controller SD card image.
• AUC3 not detected by Pi: Check the USB connection between the AUC3 and Pi. Try a different USB port on the Pi. Try a different USB cable. If the AUC3 still is not detected, SSH into the Pi and run lsusb to see if any USB device appears. No device = dead AUC3 or cable.
• Miner not detected by AUC3: The AUC3 connects to the miner via the management board connector. Check this cable. Ensure the miner is powered on (fans spinning). Try the miner with a different AUC3 if available.
• Network instability / frequent disconnects: Check for IP conflicts (static IP recommended), replace Ethernet cables, check your router/switch for port errors. An unstable network connection causes pool disconnects, rejected shares, and lost revenue.

Firmware & Software

Firmware Updates

Firmware updates for the AvalonMiner 1146 improve stability, optimize hashrate, and patch security vulnerabilities. Canaan releases firmware updates through their official website and the FMS (Factory Management System) platform.

Manual firmware update via web interface:

1. Download the latest firmware file for the AvalonMiner 1146 from Canaan’s official website. Verify the file matches your exact model — flashing wrong-model firmware can brick the management board.
2. Access the AvalonMiner Controller web interface by navigating to the Raspberry Pi’s IP address in your browser.
3. Navigate to the firmware upgrade section.
4. Upload the firmware file and click “Upgrade.” Do NOT power off the miner during the firmware update — interrupting a firmware flash can corrupt the management board firmware, requiring a factory reset or re-flash.
5. The miner will reboot automatically after the upgrade. Wait approximately 4–5 minutes for the reboot to complete.
6. Verify the new firmware version in the controller dashboard after reboot.

Batch Upgrades Using FMS

If you run multiple AvalonMiners, Canaan’s FMS (Factory Management System) allows you to monitor and update all units from a single interface. This is particularly valuable for the AUC3 daisy-chain architecture, where you might have 5+ miners on a single controller.

1. Download and install FMS from Canaan’s official website on a computer connected to the same network as your miners.
2. Launch FMS and let it scan the network. It will detect all AvalonMiner units and display their IP addresses, hashrates, temperatures, fan speeds, and firmware versions.
3. Select the units you want to upgrade (individually or in batch).
4. Upload the correct firmware file and initiate the upgrade.
5. Monitor progress — each unit will reboot individually as it completes the upgrade. Do not interrupt the process.
6. After all upgrades complete, verify firmware versions across all units in FMS.

Factory Reset Procedure

A factory reset restores the miner’s configuration, network settings, and firmware to default values. This can resolve persistent configuration issues, corrupted settings, or firmware problems. Be aware that all custom settings will be lost — back up your pool configuration, network settings, and any custom parameters before resetting.

1. Power off the miner and disconnect the power cable.
2. Locate the reset button on the back of the miner, near the Ethernet port.
3. Press and hold the reset button for 5 seconds, then release.
4. Reconnect power and turn the miner back on.
5. Wait approximately 4 minutes for the factory reset process to complete. The LED will flash blue during the reset.
6. The miner will reboot with default settings. You will need to reconfigure your network settings, pool configuration, and worker credentials.

Configuration Best Practices

Once your 1146 is running, these configuration practices will maximize performance and reliability:

• Use a static IP: DHCP is convenient but creates a point of failure. If your router reboots and assigns a new IP, you lose monitoring access. Set a static IP on the Raspberry Pi and note it somewhere permanent.
• Configure multiple pools: Set a primary pool, secondary failover pool, and tertiary backup. If your primary pool goes down, the miner automatically switches to the backup — no manual intervention needed, no hashrate lost.
• Do not overclock: The A3206 chip’s AI functionality already optimizes frequency and voltage dynamically. Manual overclocking on the 1146 typically produces diminishing returns with significantly increased power draw and heat. Run it at stock settings for the best efficiency-to-hashrate ratio.
• Monitor firmware versions: Check Canaan’s website monthly for new firmware releases. Security patches and stability improvements are worth the brief downtime of an update.
• Keep logs: Enable logging on the Raspberry Pi controller. Historical logs are invaluable for diagnosing intermittent problems that are hard to catch in real-time.

Advanced Troubleshooting

Abnormal Temperature

Abnormal temperatures on the 1146 can be caused by environmental factors, hardware degradation, or cooling system failures. The miner’s recommended operating range is -5°C to 35°C ambient. Here is a systematic approach:

1. Check ambient temperature: Use a separate thermometer to verify your room temperature. If it is above 35°C, no amount of hardware troubleshooting will help — you need to improve your environment.
2. Verify airflow: The 1146 needs clear intake and exhaust paths. Ensure nothing is blocking within 30 cm of either end of the miner. Avoid placing the exhaust side against a wall.
3. Inspect fans: Check that all four fans are spinning at normal RPM. Even one failed fan can cause localized overheating on the adjacent hashboards.
4. Dust inspection: Open the unit and check for dust accumulation on heatsinks and between boards. Heavy dust acts as thermal insulation.
5. Thermal paste condition: If the miner has been running for over a year without thermal paste replacement, degraded TIM is a likely cause. Follow the thermal paste replacement procedure.
6. Per-board temperature analysis: If one board runs significantly hotter than others, the issue is localized. Check that board’s heatsink attachment, thermal paste, and nearby fan operation. Also check for failed chips that may be consuming excess power (thermal runaway).

High Hardware Error Rate

Hardware errors (HW errors) in the CGMiner output indicate that chips are producing invalid work results. Some HW errors are normal — every miner produces them at a low rate. The threshold for concern is when HW errors exceed 2% of total work over a sustained period.

Common causes of elevated HW errors:

• Overheating chips: Chips operating near their thermal limit produce more errors. Address temperature issues first.
• Degrading chips: A3206 chips degrade over time, especially if they have been subjected to thermal cycling or ESD events. Degraded chips produce errors at increasing rates before eventually failing completely.
• Power delivery issues: Voltage ripple or sag on the hashboard power rails causes computational errors. Check your PSU and connector integrity.
• Signal integrity: Corroded or damaged connectors, cracked PCB traces, or failing passive components (capacitors, resistors) on the signal path cause communication errors between chips.

Complete Failure to Start

If the miner will not power on at all (no fans, no LED), work through this checklist:

1. Verify the wall outlet has power (plug in another device).
2. Check the power cord for damage.
3. Verify PSU switch is in the ON position.
4. Check PSU output with a multimeter — you should see 12V DC at the output connectors.
5. If PSU output is zero, the PSU has failed. Replace it.
6. If PSU output is normal but the miner does not respond, the miner management board may have failed. This requires professional diagnosis.
7. If PSU output is normal and fans spin but no LED lights up, the management board’s microcontroller may be dead or the firmware may be corrupted. Try a factory reset.

Component Overview & Architecture

Understanding the AvalonMiner 1146’s physical layout helps you navigate repairs efficiently. Here is what lives inside the chassis and where:

Internal Components

• Control panel (front): Houses the network port (Ethernet RJ45), fan connectors, reset button, FUNC button, and the multicolor LED status indicator. The control panel is where the miner management board interfaces with the outside world.
• Miner management board: The internal “brain” that communicates with the external AUC3 controller. It connects to the PSU via a 6-pin connector, to each hashboard via 2×7-pin connectors, and to the fans. Handles power distribution, chip initialization, and data routing.
• Hashboards (4 units): The compute engines. Each board contains 72 A3206 ASIC chips in a 12×6 grid, along with voltage regulators, capacitors, and signal routing components. Boards slide into the chassis on guide rails and connect to the management board via 2×7-pin connectors.
• Power supply unit (PSU): External or semi-integrated depending on SKU. Rated at 3,500 W, requires 220V AC input, outputs 12V DC to the miner. The PSU connects to the management board via a 6-pin power connector.
• Cooling fans (4 units): Two intake fans and two exhaust fans create a front-to-back airflow pattern across the hashboards. The fans connect to the management board via dedicated fan connectors.
• Reinforcement structure: Metal brackets and screws throughout the chassis secure components against vibration and shock. This is a Canaan design feature that adds durability compared to some competitor designs, but also adds disassembly complexity — keep track of bracket positions and screw counts during teardowns.

External Controller System

• AUC3 (Avalon USB Converter 3): A small USB bridge device that translates between the Raspberry Pi’s USB interface and the AvalonMiner’s internal communication protocol. Each AUC3 can daisy-chain up to 5 AvalonMiners, making multi-unit deployments more efficient. The AUC3 is a small PCB with USB-A input and a proprietary connector to the miner.
• Raspberry Pi (or compatible SBC): Runs the AvalonMiner Controller software (CGMiner-based). Hosts the web management interface, handles pool communication, and manages all connected miners via their AUC3 links. The Pi connects to your local network via Ethernet and receives power from its own dedicated adapter (5V, not from the miner PSU).

Frequently Asked Questions

When to Call a Professional

This guide covers everything a competent home miner can do with basic tools and some technical confidence. But there are clear boundaries where DIY ends and professional repair begins:

• BGA chip replacement: The A3206 chips are ball-grid-array packages that require hot air rework station, proper flux, temperature profiling, and experience to replace without damaging adjacent components. This is not a soldering iron job.
• PCB trace repair: If a multimeter reveals a broken trace on the hashboard PCB, trace repair requires micro-soldering skills and equipment most home miners do not have.
• Management board failure: If the miner management board is dead (PSU works, fans do not spin, no LED activity), the board needs component-level diagnosis that requires an oscilloscope and deep knowledge of the board’s schematic.
• Multiple dead chips: If more than 5–8 chips are dead on a single hashboard, the root cause may be a power delivery problem that is killing chips sequentially. Replacing chips without fixing the underlying cause just creates more dead chips.
• Water damage or corrosion: If your miner has been exposed to moisture, the damage is often more extensive than what is visible. Professional ultrasonic cleaning and component-level testing is needed.

D-Central Technologies has been repairing ASIC miners since 2016. We have serviced 2,500+ miners at our facility in Laval, Quebec. Our technicians have the equipment, the spare parts, and the experience to handle any repair that exceeds home-level capabilities. We repair Canaan AvalonMiners alongside Bitmain Antminers, Whatsminer, and every other major platform.

Interactive Hashboard Schematic

Explore the AVALONMINER 1146 hashboard layout below. Toggle layers to isolate voltage domains, signal chains, test points, key components, and thermal zones. Hover over any region for quick specs — click for detailed diagnostics, failure modes, and repair guidance.