Harbor Freight Cen-Tech 98614 & Autel MS509 Scan Tools

It's time to do some opening up of my scan tool and attempt to decipher the internals.

Now for a close up of the electronics:

I will be publishing a list of critical components (primarily ICs) on the board soon to help with reverse engineering the unit.

• U1 -74HC03D, Quad 2-Input NAND Gate, http://www.nxp.com/products/logic/gates/nand_gates/74HC03D.html
• U2 - 74HC32D (NXP), Quad 2-Input OR Gate, http://www.nxp.com/products/logic/gates/or_gates/74HC32D.html
• U3 - LM339 (TI)
• U4 - MCP2515(MicroChip), CAN Controller, http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010406
• U5 - MCP2551 (MicroChip), CAN Transceiver, http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010405
• U6 - 74HC138D (NXP), 3-to-8 line decoder, demultiplexer; inverting, http://www.nxp.com/products/logic/decoders_demultiplexers/74HC138D.html
• U7 - 78M05 - 5V Voltage Regulator
• U8 - 74HC244D (NXP), Octal buffer, line driver; 3-state, http://www.nxp.com/products/logic/buffers_inverters_drivers/74HC244D.html
• U9 - AT89C51RD2-UM (Atmel), Microprocessor, http://www.atmel.com/devices/at89c51rd2.aspx
• U10 - CD40106BM (TI), Hex Schmitt Trigger, http://www.ti.com/product/CD40106BM
• U11 - CD4013BM (TI), Dual D Flip-Flop, http://www.ti.com/product/CD4013BM
• U12 - 45DB161D-SU (Atmel), 16 Megabit Flash Memory
• U13 - 
• U14 - 30638
• U15 - HC373 (TI Brand)
• U16 - FT232BL (FTDI Brand), USB to Serial converter, http://www.ftdichip.com/Products/ICs/FT232BM.htm

YOOCNC T62-3AX CNC Controller for 3020T

Many people may want to add additional inputs and outputs to their 3020CNC, but not know how. In this post I will attempt to show others how one could possibly do this with their existing hardware. This eliminates costly (not that costly these days) replacement of the controller board (depending on what you want to do it may be worth upgrading your controller).

The YOOCNC T62-3AX is the controller board on my 3020T CNC. It has only XYZ axes (no A axis like other YOOCNC boards). There are no inputs being used from the factory other than the E-Stop. However, from my analysis of the PCB board we can add at 5 inputs and a single output channel to the existing board without much modification.

The board uses the EL 817 photo coupler as well as 74HC140 Hex Inverting Schmitt Triggers (for the outputs).

PCB Schematic/Routing:

 I tried to make this schematic/PCB design as close as possible to the original. It was drawn in FreePCB, and open source project. It's a great option to quick making quick circuits. Make sure to check it out as it functions very similar to PCB123. I might add more later to show additional options.

On the left you see the 5 photo-couplers that are unused with the exception of U25 which runs the E-Stop. Then on the right side you see U14, U24, & U10 which are an unused output. U4 is a photo-coupler which actually is not soldered to the board, so I would have to order one chip to make that functional. U14 & U10 are hex-inverting schmitt triggers that were mentioned above.

Some pictures of the board itself:

So that's on for now folks! I will follow up this post with the modifications of the circuit board to add my limit switches and possible spindle on/off control.

Unpacking the 3020 CNC

I received my CNC and took a few pictures of how well it was packaged. Take a look!

 The box was not that impressive at all from the outside, but it was deceptively well packed as I found out.

 The foam was cut perfectly to fit every nook & cranny of the box to prevent any movement of the machine during shipping.

 Even the servos were very well packed in a thick foam case made specifically for them.

 Here is the CNC router on it's new base, a craftsman tool bench.