On Sun, Jan 6, 2019 at 5:03 PM fabry891 <fabrizio.vita80@gmail.com> wrote: > > Hi, > thanks MiaM for your replay. > I've checked the 6561-101 and there isn't any oxidation, as well as other > parts of mainboard, nothing oxidation. > The power supply that I use is the same for the C64, I checked the ouput and > there is a surprise, 5.22 Volt DC between ground and pin 5, but 1.1 max 2.5V > AC between pin6 vs gnd and 8.7V AC V between pin7 vs gnd, it's very strange. > The frequence is correct 50 hz. > This issue on pin 6 can be the cause of my audio? 9VAC can be measured only between the two AC pins, that supply is just a floating (i.e. not connected to ground) transformer secondary. > I replace the fuse and I saw a strange white material, like oxidaton into > the fuse holder. > If I want to replace the 6561-101, I simply buy a new one and insert into > the socket, or it need to be programmed? 6561 are very expensive and by the way, are you only trying via a RF modulator to a TV? RF modulators easily go out of tune and can produce a way off sound carrier or transmit out of frequency between two channels too. Your TV might be trying to autotune (and might also fail at correctly auto-tune) or might even not try to tune to the correct channel. You can't conclude anything without trying how the audio sound directly at the A/V connector. PS: 6561 don't need to be programmed. FrankReceived on 2019-01-06 18:00:30
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