Editing Psion Series 3mx (section)

== The SSD door microswitches ==

'''This is the 3mx's own characteristic fault, and it is worth understanding before you open one.'''

Where the [[Psion Series 3c|3c]] senses its SSD slot doors with PCB tracks and a small metal connector on the door hinge, the 3mx uses '''a pair of microswitches set at an angle'''.<ref name="rc3mx">Richard Zealley, [https://www.retrocoding.uk/psion-3mx-ssd-microswitch-repair/ "Psion Series 3mx SSD door microswitch repair"], Retro Coding, 25 May 2020. Source for the microswitch arrangement, the failure mechanism, the "not ready" symptom, the requirement to repair both switches, and the repair method.</ref>

'''The plastic tips of those microswitch buttons snap off''' — almost always because the motherboard was prised out '''with the SSD doors closed'''. The machine then reports "'''not ready'''" and refuses to see a pack in either slot, which looks exactly like a motherboard fault and has sent more than one owner chasing the wrong thing.<ref name="rc3mx" />

'''Open both SSD doors before removing the mainboard.''' The repair, if it is already too late, is on the [[Psion Series 3mx Troubleshooting Guide]].