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2011-08-22 by Quazimodo
Just to let group members know that Emerson Lake and Palmer tribute: "Noddy's Puncture" will be playing three gigs in East Sussex UK this coming bank holiday weekend (26,27,28 August). Friday at 'Trading Boundaries' near Fletching and Saturday/Sunday at Keith Emerson's old local - 'The Six Bells' in Chiddingly. Hammond's, Leslie's and Moog's will be in use...;c) Please see our website for full details: www.noddyspuncture.co.uk Cheerz, TOM
2011-11-09 by martin.morgan@bnymellon.com
2011-11-09 by bluejinn
Do you have the service manual? This is critical. If not, you can find a partial service manual here: http://www.synthfool.com/docs/Arp/ArpQuadra/ It's actually missing a couple of pages, (a parts list and one PCB diagram) but is complete enough, and if you need the missing page I have it. I am pretty sure this one has all the schematics. Also, most of the other copies of the manual you will find online will in fact be this scan. I am having similar problems with my Quadra, with strings/poly section on certain sharps sounding wrong, and also one note not sounding at all, and I am pretty sure these are separate faults. The Quadra poly synth section is based on the Omni, (and some of the service literature actually says Omni) and I haven't got around to working on mine, but started to look at threads re: similar issues with the Omni. Sorry I can't be of more help at the moment. I'm not that much of a tech either. The Omni manual is also available at that same site above and I started to compare the two to learn about how the notes are produced. --- In vintagesynthrepair@yahoogroups.com, martin.morgan@... wrote:
> > HI all, > > My 1st post to this group - been lurking a while.. :0) > > Quadra question for you - Top C# (C#5) and only this one note is > misbehaving > > On both the Poly & Strings sections when on the 4' setting, this note also > sounds the 8' setting note > > On 8' setting the all the notes play as expected > > Any one come across this sort of thing before? > > Also one other observation is that the keypad itself is not a Pratt & Read > - is this a common thing with Quadra's? > > Hope this makes sense! > > Regards, > > Martin > > The information contained in this e-mail, and any attachment, is confidential and is intended solely for the use of the intended recipient. Access, copying or re-use of the e-mail or any attachment, or any information contained therein, by any other person is not authorized. If you are not the intended recipient please return the e-mail to the sender and delete it from your computer. Although we attempt to sweep e-mail and attachments for viruses, we do not guarantee that either are virus-free and accept no liability for any damage sustained as a result of viruses. > > Please refer to http://disclaimer.bnymellon.com/eu.htm for certain disclosures relating to European legal entities. >
2011-11-09 by bluejinn
Also, I had an issue with the microprocessor, here is a thread regarding that. OT I know, but it is good to have some reference material in case you have the same problem. http://homerecording.com/bbs/general-discussions/analog-only/arp-quadra-computer-problem-325378/2/ --- In vintagesynthrepair@yahoogroups.com, "bluejinn" <nchevatarevich@...> wrote:
> > Do you have the service manual? This is critical. If not, you can find a partial service manual here: > > http://www.synthfool.com/docs/Arp/ArpQuadra/ > > It's actually missing a couple of pages, (a parts list and one PCB diagram) but is complete enough, and if you need the missing page I have it. I am pretty sure this one has all the schematics. Also, most of the other copies of the manual you will find online will in fact be this scan. > > I am having similar problems with my Quadra, with strings/poly section on certain sharps sounding wrong, and also one note not sounding at all, and I am pretty sure these are separate faults. > > The Quadra poly synth section is based on the Omni, (and some of the service literature actually says Omni) and I haven't got around to working on mine, but started to look at threads re: similar issues with the Omni. > > Sorry I can't be of more help at the moment. I'm not that much of a tech either. The Omni manual is also available at that same site above and I started to compare the two to learn about how the notes are produced. > > --- In vintagesynthrepair@yahoogroups.com, martin.morgan@ wrote: > > > > HI all, > > > > My 1st post to this group - been lurking a while.. :0) > > > > Quadra question for you - Top C# (C#5) and only this one note is > > misbehaving > > > > On both the Poly & Strings sections when on the 4' setting, this note also > > sounds the 8' setting note > > > > On 8' setting the all the notes play as expected > > > > Any one come across this sort of thing before? > > > > Also one other observation is that the keypad itself is not a Pratt & Read > > - is this a common thing with Quadra's? > > > > Hope this makes sense! > > > > Regards, > > > > Martin > > > > The information contained in this e-mail, and any attachment, is confidential and is intended solely for the use of the intended recipient. Access, copying or re-use of the e-mail or any attachment, or any information contained therein, by any other person is not authorized. If you are not the intended recipient please return the e-mail to the sender and delete it from your computer. Although we attempt to sweep e-mail and attachments for viruses, we do not guarantee that either are virus-free and accept no liability for any damage sustained as a result of viruses. > > > > Please refer to http://disclaimer.bnymellon.com/eu.htm for certain disclosures relating to European legal entities. > > >
2011-11-10 by babouche369
Hi Martin I don't know the Quadra, but I'm currently repairing an Omni. I had a couple of non-working notes in the string section (Upper Voicing Board) due to bad 4069. An oscilloscope helps a lot fixing that. Also, ARP used a lot a tantalum caps, which tend to go short while aging. I don't like the motto "recap first" and prefer understanding before ironing, but I must admit almost half of the tantalum caps were actually bad! On the keyboard section, I replaced tants by cheaper electrolytics. I've read at that time, tants were choosen by ARP because of a better quality; modern electrolytics have improved quality and can replace tants where leak current is not critical. HTH Francois --- In vintagesynthrepair@yahoogroups.com, "bluejinn" <nchevatarevich@...> wrote:
> > Also, I had an issue with the microprocessor, here is a thread regarding that. OT I know, but it is good to have some reference material in case you have the same problem. > > http://homerecording.com/bbs/general-discussions/analog-only/arp-quadra-computer-problem-325378/2/ > > --- In vintagesynthrepair@yahoogroups.com, "bluejinn" <nchevatarevich@> wrote: > > > > Do you have the service manual? This is critical. If not, you can find a partial service manual here: > > > > http://www.synthfool.com/docs/Arp/ArpQuadra/ > > > > It's actually missing a couple of pages, (a parts list and one PCB diagram) but is complete enough, and if you need the missing page I have it. I am pretty sure this one has all the schematics. Also, most of the other copies of the manual you will find online will in fact be this scan. > > > > I am having similar problems with my Quadra, with strings/poly section on certain sharps sounding wrong, and also one note not sounding at all, and I am pretty sure these are separate faults. > > > > The Quadra poly synth section is based on the Omni, (and some of the service literature actually says Omni) and I haven't got around to working on mine, but started to look at threads re: similar issues with the Omni. > > > > Sorry I can't be of more help at the moment. I'm not that much of a tech either. The Omni manual is also available at that same site above and I started to compare the two to learn about how the notes are produced. > > > > --- In vintagesynthrepair@yahoogroups.com, martin.morgan@ wrote: > > > > > > HI all, > > > > > > My 1st post to this group - been lurking a while.. :0) > > > > > > Quadra question for you - Top C# (C#5) and only this one note is > > > misbehaving > > > > > > On both the Poly & Strings sections when on the 4' setting, this note also > > > sounds the 8' setting note > > > > > > On 8' setting the all the notes play as expected > > > > > > Any one come across this sort of thing before? > > > > > > Also one other observation is that the keypad itself is not a Pratt & Read > > > - is this a common thing with Quadra's? > > > > > > Hope this makes sense! > > > > > > Regards, > > > > > > Martin > > > > > > The information contained in this e-mail, and any attachment, is confidential and is intended solely for the use of the intended recipient. Access, copying or re-use of the e-mail or any attachment, or any information contained therein, by any other person is not authorized. If you are not the intended recipient please return the e-mail to the sender and delete it from your computer. Although we attempt to sweep e-mail and attachments for viruses, we do not guarantee that either are virus-free and accept no liability for any damage sustained as a result of viruses. > > > > > > Please refer to http://disclaimer.bnymellon.com/eu.htm for certain disclosures relating to European legal entities. > > > > > >