I doubt J2's output would damage anything, but you could use some sort of gain stage (pre-amp or something?) before your soundcard if you're worried. Pulses should be about 10 ms long, which you should be able to measure on your computer. > To: vintagesynthrepair@yahoogroups.com > From: freckles@freeola.com > Date: Mon, 13 Oct 2008 15:00:59 +0100 > Subject: Re: [vintagesynthrepair] Boss DR-55 sounding problem - FINALLY! > > Oops, how right you are! > > I can't hear any flam on the hi-hat, its quite a soft attack on it > anyway so I might not hear if it was. In the "8" mode the hi-hat lags > behind by what sounds like a constant amount. At faster tempos it sounds > ridiculously out of time! Maybe all dr-55s do that - I don't know... > > A scope would be better but I suppose I could connect J2 to my > soundcard, record it and look at the wave. might be wise to go through a > DI box or something though, don't wanna blow my inputs. > > > Chris > > > Scott Nordlund wrote: >> There actually isn't a CPU- the TC5501 is a RAM chip (interesting design!). >> >> I think this would be a very easy problem to solve with an oscilloscope, but things get a little more "interesting" if you don't have one. >> >> Do you hear the "flam" sound on the hi-hat sound? Do the "16" and "8" modes work properly (8 should be half-speed)? Do they both have the "flam" sound? >> >> Do you have a way of observing what comes out of J2? >> >> C42 should determine the tempo, so it's probably fine. >> >> ________________________________ >> To: vintagesynthrepair@yahoogroups.com >> From: freckles@... >> Date: Sun, 12 Oct 2008 17:23:59 +0100 >> Subject: Re: [vintagesynthrepair] Boss DR-55 sounding problem - FINALLY! >> >> Hi Scott >> >> >> >> thanks for your info, and sorry for the HUGE delay in getting back to this. >> >> >> >> Its not a start-button problem. regardless of what is programmed in the >> >> memory, when the cpu [tc5501] sends out the drum trigger signals, its >> >> like each trigger is doubled. its not a semi-quaver apart but maybe 10ms >> >> or something, which makes me wonder if the sounds are restarting on the >> >> falling edge of the trigger pulse as well? but maybe its more basic than >> >> that.. >> >> >> >> my knowlege of electronics is very limited - i don't even understand >> >> what's happening in the clock circuit, maybe the problem is there as it >> >> connects directly to one of the cpu pins next to the trigger outputs.. ? >> >> what would happen if C42 was faulty? What does NP 1/50 mean [next to >> >> C42]. I tried replacing the 4011UB but no change. >> >> >> >> Any help very much appreciated >> >> >> >> Thanks >> >> >> >> Chris >> >> >> >> Scott Nordlund wrote: >> >> >>> I don't have a DR-55 but I downloaded the service manual for my own >>> >> >> >>> amusement (I'm cool like that). I would guess that the note button is >>> >> >> >>> double-triggering, and the sequencer then correctly plays back the >>> >> >> >>> wrongly-entered sequences (where you can turn the tempo down and hear >>> >> >> >>> two successive steps rather than a double-triggered flam), yes? If >>> >> >> >>> I'm understanding this correctly, the rest button shouldn't >>> >> >> >>> double-trigger, and you should replace C45. >>> >> >> >> >> >>> ---------------------------------------------------------- >>> >> >> >>> To: vintagesynthrepair@yahoogroups.com >>> >> >> >>> From: freckles@... >>> >> >> >>> Date: Thu, 10 Apr 2008 18:10:14 +0000 >>> >> >> >>> Subject: [vintagesynthrepair] Boss DR-55 sounding problem >>> >> >> >> >> >>> Hi just wondering if anyone has some advice/tips for me. >>> >> >> >> >> >>> I have what appears to be a fully working DR-55 except the drum sounds >>> >> >> >>> are double-triggering. most noticeable is the kick which obviously >>> >> >> >>> flams, making it sound very farty. >>> >> >> >> >> >>> I don't have a scope but i've recorded it to my laptop and can see the >>> >> >> >>> double peak. >>> >> >> >> >> >>> Anyone have any idea what it could be? I can mail relevant service >>> >> >> >>> manual pages if that helps. >>> >> >> >> >> >>> Thanks >>> >> >> >> >> >> >> >> >> >>> ---------------------------------------------------------- >>> >> >> >>> More immediate than e-mail? Get instant access with Windows Live >>> >> >> >>> Messenger. >>> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> _________________________________________________________________ >> See how Windows Mobile brings your life together—at home, work, or on the go. >> http://clk.atdmt.com/MRT/go/msnnkwxp1020093182mrt/direct/01/ >> ------------------------------------ >> >> Yahoo! Groups Links >> >> >> >> >> > > ------------------------------------ > > Yahoo! Groups Links > > To visit your group on the web, go to: > http://groups.yahoo.com/group/vintagesynthrepair/ > > Your email settings: > Individual Email | Traditional > > To change settings online go to: > http://groups.yahoo.com/group/vintagesynthrepair/join > (Yahoo! 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RE: [vintagesynthrepair] Boss DR-55 sounding problem - FINALLY!
2008-10-13 by Scott Nordlund