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I am pleased to report another successful PA5 repair. The old module was a pain to remove, but I just worked it out with a manual solder sucking syringe. I also cut the pins down to allow better access. I find if you can rock the pins slightly in their holes you know they are desoldered. Takes patience. I agree that adding some leaded solder seems to lower the solder melting point.
Many thanks gamerpaddy for making this repair possible!
2 screws on the bottom, 2 on the back.
get some pliers and wrap the tip in cloth or plastic and pull out the volume knob (its just pressed onto a shaft, dont worry breaking it. dont bend, just pull)
then remove a nut behind it.
push the volume shaft and it should pop out on the back.
pull 3 plastic retainers on the bottom to remove the plastic isolation sheet below.
Thanks very much. The amplifier is working again with the new module - an excellent result! We suspected the volume control knob pulled off, but didn't like to exert too much force without being sure! Installed the headers so any future replacement would be a lot easier. There's also a picture with instructions that might help people here - https://www.diyaudio.com/community/...25x-is-a-modification-worth-it.380233/page-19 (well down the page)