Since my previous post, one of my units decided to randomly switch into standby state. No problem, i just followed the update procedure to Ver. 1.02 as kindly described in this thread. No issues and seems to have solved it. Whilst I had the software downloaded I thought i would update my second PA400 which has been operating fine. I took the rear cover off, plugged in the usb C and attempted to put the unit into update mode. No dice! Seems the push function on the rotary encoder was bust and I was unable to bypass normal powering of the amp, as per instructions. As i had the case open, it was a straightforward task to unplug the various cable connectors, remove the switching power module and unscrew the pcb with the surface mount rotary encoder. Careful of the ribbon cable i was able to probe the pads and legs of the encoder. Sure enough, one of the two legs was unsoldered to its pad. Quick solder, put it all back together and then the update went smoothly.
Photo of the internals for anybody interested.
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