WhinyLittleRunt
Member
I was cleaning up my M-308 today trying to decide whether or not I need it and want to move it along, and so I was running things through the board and testing, etc. One function I never tested when I bought the board 5-6 years ago was the assign switches, because until I bought my 388 I actually had no idea how to use them. So in testing I'm finding that busses 3 and 4 are distorting and clipping tremendously. But these busses 1-4 also have 2 tape returns on each channel strip, and they have on/off switches on each one, so in order for the input channel to pass through the buss channel, you have to turn it on. There are 2 switches per channel, which also work for the tape returns (I've attached a pic to make it easier). So, for channel 4, as an example, if I turn on the upper channel, it doesn't distort but the needle pegs immediately. If I turn on the lower channel, it distorts. You can use either one. 3 does a similar thing. 1 and 2 are working fine.
I'm not sure what to look for... I've reseated whatever I could and de-oxed connectors inside but this model isn't set up like a 38 R2R where the cards come out. It's more like everything is attached to the top panel and you take off a buss strip that connects everything together rather than the cards themselves... I'll try maybe to re-flow solder on the connections but other than that, any theories?
EDIT: I tried re-flowing the solder on the connection to busses 3 and 4 and that made zero difference. And these cards are not easy to get to on this deck.
I'm not sure what to look for... I've reseated whatever I could and de-oxed connectors inside but this model isn't set up like a 38 R2R where the cards come out. It's more like everything is attached to the top panel and you take off a buss strip that connects everything together rather than the cards themselves... I'll try maybe to re-flow solder on the connections but other than that, any theories?
EDIT: I tried re-flowing the solder on the connection to busses 3 and 4 and that made zero difference. And these cards are not easy to get to on this deck.
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