![]() ![]() Otherwise, you will need hot air soldering equipment to remove the old fuse. If you choose the Littlefuse part and the old fuse is also the Littlefuse part (recognisable by its metal end caps), you may be able to solder the new fuse on top of the old fuse. Suitable part numbers are Kamaya FCC16151AD-B and Littlefuse 0438.250WR. Replace the original fuse with any fast acting 0603 size fuse having a rated current of between 125 and 250mA and a resistance of between 2 and 4 ohms.If this happens to your Duet, you should first identify and fix the short. The resistance between a VSSA pin on a thermistor connector and a GND pin on an endstop connector, which should normally read less than 5 ohms, will be very high (the pins are labelled on the underside of the Duet).All thermistors will show as open circuit.If you get a short in your wiring between your heater or fan wiring and the VSSA side of a thermistor connection, and you have a Duet 2 board revision 1.0 or 1.01 or a white Duet 2 Wifi pre-production board, then fuse F1 will blow. 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. Connectors used on 6HC Mainboard and 3HC ExpansionĢ.54mm Molex compatible connectors are used for everything except stepper motor and medium-current outputs.
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