![]() ![]() ![]() Hot air soldering/desoldering is much easier if you heat the whole board to about 100-125C on an electric hotplate. 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. Alternatively, pull the white plastic part off the pins using pliers (this is easier if you heat the pins to 180C with hot air first), and replace it afterwards. corrugated cardboard covered with Kapton tape to shield them from the hot air. If using hot air, the hot air is likely to melt or at least discolour the white plastic parts of the adjacent connectors. To remove the old mosfet, you will need either a hot air desoldering tool with a small nozzle, or low melting point solder such as ChipQuik. The component identifiers on the board are: You can also use type PMV20XNER or AO3400A or AOSS32334C which have a higher peak current rating and are fitted as standard in recent production Duets. The original part number on most Duets is PMV40UN2 or PMV40UN2R which is available from the usual electronic component distributors such as Farnell/Newark/element14, Digikey, Mouser and RS. If you short out a PWM fan, the fan driver mosfet will burn out. Here are the compatible part numbers: Part In general you should use crimp pins and shells from the same manufacturer to ensure compatibility. In particular, they will not lock into Molex 22-01-20x5 shells. The crimp pins made by Würth should only be used with shells made by Würth. Please note that the shells and crimp pins that supplied with Duets are usually made by Würth Elektronik. The commonly available KF2510 connector kits also fit quite well and include extra pieces for future expansion. There are compatible connectors available from Würth Elektronik and JYK. Molex KK connectors are widely available from the usual electronic component distributors, and on eBay. However, for maximum reliability we recommend using the correct Molex female connectors or compatible connectors, because they lock in place and will only fit one way round. The Dupont-style connectors typically used with RAMPS and other electronics will also fit them. The connectors for the stepper motor, endstop switch, thermistors and fans on the Duet 2 are Molex KK type. (many alternatives are available, for example from suppliers on eBay). The fork connectors for the power supply are a generic "blue" max 2.5mm^2 like this version from RS. Crimps for the above: BVH-21T-P1.1B (JST) or VH396T-L (Valcon)Ħ-pin SWD connector (JST ZH) : ZHR-6 note it is normally easier to buy a pre crimped tail and JST ZH are quite fiddly to crimp). ![]() 4 way shell VHR-4N (JST) or VH396-04H (Valcon).2 way shell VHR-2N (JST) or VH396-02H (Valcon).Stepper motor (4-pin) and medium-current (2-pin) outputs: JST VH series or compatible: Please note, the Molex KK compatible shells and crimp pins that we supply with Duets are usually made by Würth Elektronik. These are widely available from the usual electronic component distributors, and on eBay. Vantec 0 0 6.Connectors used on 6HC Mainboard and 3HC ExpansionĢ.54mm Molex compatible connectors are used for everything except stepper motor and medium-current outputs. Not only do these grips make it easier to hold, pressing down on the grips separates the connector from the device slightly, perfect for when the molex connector feels "stuck." Vantec EZ-Grip Molex Connectors are available in a variety of UV reactive colors. The Vantec EZ-Grip Molex connectors simplify the ordeal by putting flexible, rounded grips on the top and bottom of the molex connector. The protrusions on the side of the molex are difficult to hold on firmly and, if you were to exert force, can leave your fingers feeling sore. Removing the power from devices inside your computer can be difficult with standard molex plugs. 2579 Vantec EZ-Grip Molex Connector Kit - UV Yellow 2.69 8.9500 USD InStock /Wire Management/PSU Connector Changeover Kits Removing the power from devices inside your computer can be difficult with standard molex plugs. ![]()
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