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Revision to Connector and spare part numbers

David Crocker

You will need a hot air desoldering tool with a small nozzle to remove the old mosfet. Use a shield made from corrugated cardboard and Kapton tape to shield connectors and other plastic components from the hot air. The new mosfet can be soldered in place using a fine-tipped soldering iron, or by putting a little no-clean flux on the pads, placing the new mosfet on top, and using hot air again. Hot air soldering/desoldering is easier if you heat the whole board to about 100-125C on an electric hotplate.
Alternatively, use ChipQuik and a soldering iron to remove the old mosfet.
=== VSSA fuse ===
The small green component bearing the letters 'bF' is the self-resetting fuse, and the component with stripes is the optional 10K resistor. A piece of Kapton tape was put on the board first to provide additional insulation.
=== Blade fusefuses ===
=== Blade fusefuses ===
PCB revisions 1.03 and later have a 1A mini auto blade fuse protecting the fan circuits when the fan voltage selection jumper is in the VIN position. Here is an example of a suitable replacement: You can increase the fuse rating to 2A or even 3A if your fans, air pumps etc. draw more than 1A in total.
PCB revision 1.04 has the same 1A fuse for the fan circuits and also a 15A fuse for the bed heater circuit and a 7.5A fuse for everything else. These are mini blade fuses. The 1A can be a little hard to find but the other ratings are widely available.

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