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Revision to Connector and spare part numbers

Tony

== Molex Style Connectors ==
 
The connectors for the stepper motor, endstop switch, thermistors and fans on the Duet WiFi2 are Molex KK type. The Dupont-style connectors typically used with RAMPS and other electronics will also fit them. 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 connectors for the stepper motor, endstop switch, thermistors and fans on the Duet WiFi2 are Molex KK type. The Dupont-style connectors typically used with RAMPS and other electronics will also fit them. 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.
 
Here are the Molex part numbers for the mating female connectors. These are widely available from the usual electronic component distributors, and on eBay.
=== VSSA fuse ===
 
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 WiFi2 board revision 1.0 or 1.01 or a white Duet WiFi2 Wifi pre-production board, then fuse F1 will blow. The symptoms are:
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 WiFi2 board revision 1.0 or 1.01 or a white Duet WiFi2 Wifi pre-production board, then fuse F1 will blow. The symptoms are:
 
* All thermistors will show as open circuit
# 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 WiFi2 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. Here is a photograph showing this modification.
# Bypass the original fuse with a self resetting fuse as is fitted on Duet WiFi2 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. Here is a photograph showing this modification.
 
[image|348|align=center]

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