Hi there, I've got a Panasonic SA-HE90 which also gives me a F70 error. Luckily I got a full schematic and spent some time to investigate the problem. To my understanding F70 error could mean almost every error. A couple of internal ICs are connected to the central processor via I2C bus. As soon one IC fails to work, it seems the amp reports the error. This does happen when one or more voltages are missing (fuse blown) or because of other reasons. In my case I'm still looking around, which IC is causing the problem. I thought this might be of interest to you. BR Ralf

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