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Author: Admin | 2025-04-28
This tutorial applies to Avalon A821, A841, A851, and other series of miners. The article takes Avalon 821 as an example to explain the precautions and methods of A821 hash board maintenance.First, we need to understand how to connect the test fixture and hash board.The test fixture consists of the PMU board and the MM board (control board). The connection method is as follows:PMU connection diagram:12V power input port: connect to the power supply of the miner;VCore and GND: Connect the VCore and GND of the hash board to be tested;Signal output: connect to the signal port of the hash board to be tested;Connect with the A821 MM board: Connect the Avalon 821 PMU with the A821 MM board.Notice:1. The A821 MM board is connected to the A821 PMU. Due to the program settings, the DATA2 interface of A821 is connected to J8 of the PMU, and the DATA2 pin1 of the A821 MM board corresponds to the J8 pin2 of the A821 PMU;2. The signal and VCore power of the A821 PMU are only output from the J6 connector and the VCore-2 side, so only the J6 side connector and the VCore-2 power output can be connected. Therefore, it is necessary to pay attention to the interface direction of the signal output end of the A821 PMU; like regular plugs, the pins are reversed.Pay attention to the order of the 12V power input ports, the top is GND (black), and the bottom is 12V (yellow);MM board (control board) connection
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