Problem is oxidation...Remove and clean the ends of cables with
sandpaper slowly...there is slim and flat cable into the reciver
(together with five cable)...specially remove it's socket and clean
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The F70 error certainly indicates a blown fuse inside. The real problem is why the fuse is blown: there are only two possible reasons 1. there is a short circuit on the output (lines or speakers) 2. you have a blown output transistor (and that means some work and skills to replace).
To be sure, please change the fuse with a same rated fuse (buy more than one because it can blow again). Disconnect the speakers and turn the amp on. If the fuse blows again, it is sure something wrong with the output transistors. If the fuse remains ok, then please check all the wiring to the speakers.
problem is oxidation...Remove and clean the ends of cables with sandpaper slowly...there is slim and flat cable into the reciver (together with five cable)...specially remove it's socket and clean it...
There are poor solder connections at the output amp pacs and the voltage regulators. Once these are resoldered the problem should go away. If you can solder, resolder any connections that appear grainy or have rings. If you can not, this should be effectively a labor only repair for any shop that works on audio gear.
sounds like the speaker protection relay is operating probably from a dc condition appearing on power amplifiers outputs. probable cause is dry solder joints to the output stages. will need some reworking of the PA stage soldering to fix.