sci sixtk. battery replacement
2002-07-02 by ed hallborg
Hello! has anyone changed the battery on a sci six trak? Mine seems to be fine but I've built so many good patches into the synth over the last couple years and I keep thinking I should change it before it goes and I lose them all. A while back some one was talking about keeping the power turned on a certain korg synth while changing the battery on to prevent losing the memory, is this a universal truth that applys to any synth? Thanks much, ED To unsubscribe from this group, send an email to: vintagesynthrepair-unsubscribe@egroups.com ------------------------------------------------------------------------ There are 3 messages in this issue. Topics in this digest: 1. Re:Repairing power supply.
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From: Peter M Blackett 2. Re:Repairing power supply. From: "ethanzer0" 3. RE: Repairing power supply. From: "Ron Lake" ________________________________________________________________________ ________________________________________________________________________ Message: 1 Date: Fri, 28 Jun 2002 09:27:42 +0100 From: Peter M Blackett Subject: Re:Repairing power supply. HI, in a lot of older power supply units its likely that the electrolytic smoothing caps may need changing . this applies to both the linear and the switched mode supply units . modern electrolytics may be smaller that the older ones you are replacing .you should always use caps with at least the voltage rating of the ones you are replacing .I't not a good idea to increase the capacitance value of the replacements as this can cause other parts to fail [ such as the rectifier diodes ]. remember that a switched mode supply will need a load on it to work corectly . regards Peter ethanzer0 wrote: > > I have an old +/-15v .5A power supply that is very noisy and I > suspect it is in need of servicing; potentially a rebuild. Does and > body have experience doing this kind of thing? I have schematics and > a service manual and my scope should be here monday. > > Any help will be greatly appreciated. > > Thank in advance, > > Ethan > > > To unsubscribe from this group, send an email to: > vintagesynthrepair-unsubscribe@egroups.com > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ -- web page http://home.clara.net/dragonser/index.html ________________________________________________________________________ ________________________________________________________________________ Message: 2 Date: Fri, 28 Jun 2002 15:15:55 -0000 From: "ethanzer0" Subject: Re:Repairing power supply. --- In vintagesynthrepair@y..., Peter M Blackett wrote: > HI, > in a lot of older power supply units its likely that the electrolytic > smoothing caps may need changing . > this applies to both the linear and the switched mode supply units . > modern electrolytics may be smaller that the older ones you are > replacing . Hello Peter, Can this account for the hum coming from the supply? I mean the supply itself actually hums and crackles. I don't mean not hum and crackle in the audio path. The supply actually sounds like electricity sound efx from 1930s/40s b-grade sci-fi and horror movies. Thanks again, Ethan ________________________________________________________________________ ________________________________________________________________________ Message: 3 Date: Sat, 29 Jun 2002 13:04:48 +0100 From: "Ron Lake" Subject: RE: Repairing power supply. Hi Ethan, You will probably find that the 'noise' (if you mean actual sound rather than instability of supply), is caused by the transformer. Check the transformer mountings for security and tighten down where required. This may help. Regards, Ron. -----Original Message----- From: ethanzer0 [mailto:ethanzer0@...] Sent: 27 June 2002 19:47 To: vintagesynthrepair@yahoogroups.com Subject: [vintagesynthrepair] Repairing power supply. I have an old +/-15v .5A power supply that is very noisy and I suspect it is in need of servicing; potentially a rebuild. Does and body have experience doing this kind of thing? I have schematics and a service manual and my scope should be here monday. Any help will be greatly appreciated. Thank in advance, Ethan To unsubscribe from this group, send an email to: vintagesynthrepair-unsubscribe@egroups.com Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. [This message contained attachments] ________________________________________________________________________ ________________________________________________________________________ Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ --------------------------------- Do You Yahoo!? New! SBC Yahoo! Dial - 1st Month Free & unlimited access