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Revision to Connector and spare part numbers

David Crocker

# 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. Suitable part numbers are Kamaya '''FCC16151AD-B''' and Littlefuse '''0438.250WR'''. 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. Otherwise, you will need hot air soldering equipment to remove the old fuse.
# Bypass the original fuse with an external cartridge fuse, fitted between one of the VSSA connections and one of the ground connections.
# Bypass the original fuse with a self resetting fuse as is fitted on Duet 2 board revisions 1.02 and later. Suitable part numbers for the self-resetting fuse are Multicomp '''MC36207''' from Farnell, Bourns '''MF-MSMF014''' and Bel Fuse '''0ZCJ0020FF2E'''. Connect the fuse between the E0 thermistor VSSA pin and the E1 endstop ground pin. Optionally, connect a 10K resistor between the TCK pin of the JTAG pads and the VSSA pin of the E1 thermistor connector, which will allow the firmware to warn you when there is a short to VSSA. Note: the labels on the JTAG pads are wrong, the two columns should be swapped. So the TCK pin is the one labelled GND next to the one labelled TCK. Here is a photograph showing this modification.
# Bypass the original fuse with a self resetting fuse as is fitted on Duet 2 board revisions 1.02 and later. Suitable part numbers for the self-resetting fuse are Multicomp '''MC36207''' from Farnell, Bourns '''MF-MSMF014''' and Bel Fuse '''0ZCJ0020FF2E'''. Connect the fuse between the E0 thermistor VSSA pin and the E1 endstop ground pin. Optionally, connect a 10K resistor between the TCK pin of the JTAG pads and the VSSA pin of the E1 thermistor connector, which will allow the firmware to warn you when there is a short to VSSA. Note: the labels on the JTAG pads are wrong, the two columns should be swapped. So the TCK pin is the one labelled GND next to the one labelled TCK. Here is a photograph showing this modification.
 
[image|348|align=centerimage|1056|align=center]
[image|348|align=centerimage|1056|align=center]
 
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.

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