Hi Sansui experts! I can't figure out why my G-9000DB is doing this? it has been recapped about a year ago and it was working fine until yesterday. While It powered on and came out of protection fine but if I turned the "Tone" switch on or press one of the "Filters" button then it would go into protection mode. And while in the protection mode if I turned on the "Muting" switch then it would come out of the protection mode again. So I checked the DC offset but the reading is jumping wildly from + hundreds mv to - hundreds mv.,but the Bias is more stable. Any idea where I should be checking ? Thanks in advance!