What is written on the stickers on the EPROMS? --- In vintagesynthrepair@yahoogroups.com, "Frank Simon" <fsimon001@...> wrote: > > I don't know. How do I find this out. > ----- Original Message ----- > From: Stephen Jones > To: vintagesynthrepair@yahoogroups.com > Sent: Monday, April 28, 2008 12:14 AM > Subject: Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member). > > > Which Rev. Processor board do you have? All the Rev. > 3.1 and 3.2 Prophet 5's have a built in memory test, > and latest software versions also have a basic CPU > test. Which software version do you have? > > --- Frank Simon <fsimon001@...> wrote: > > > Steve, > > The TUNE LED does not come on. Since I am four > > CEM3310s short, should certain slots be populated > > just to get boot up? All the supplies are up. I am > > suspicious of PCB9 due to the 12v applied and you > > mentioned EQ board. There are a couple IC's that are > > warm on the EQ board but not so hot I can't keep my > > finger on it. Can you offer a couple key > > troubleshooting spots for measurements to help me > > isolate this? I'm assuming I have no way to bless > > the Processor. All I have is an Oscope, function > > generator, and multimeter. > > > > > > ----- Original Message ----- > > From: thirteentech > > To: vintagesynthrepair@yahoogroups.com > > Sent: Monday, April 21, 2008 12:21 AM > > Subject: [vintagesynthrepair] Re: Prophet 10 > > repair (was Hi from a new member). > > > > > > When you turn the machine on the front panel > > should be dark with the exception of the > > [TUNE] switch. The machine boots into it's > > autotune mode and suppresses all of the front > > panel lights and controls while it does so. it > > should take 8-10 seconds if the machine is > > functional, longer if voices are way out of > > calibration. > > > > Does the TUNE button LED come on when you power > > up? > > > > --- In vintagesynthrepair@yahoogroups.com, "Frank > > Simon" <fsimon001@> wrote: > > > > > > Steve, > > > I have all power supplies in order. There is > > power to all boards. When I turn it on > > shouldn't it boot up and LED's cycle on or blink > > or even be switchable? The panel is dead. > > Does this sound like processor to you? > > > > > > ----- Original Message ----- > > > From: thirteentech > > > To: vintagesynthrepair@...m > > > Sent: Saturday, April 19, 2008 1:07 AM > > > Subject: [vintagesynthrepair] Re: Prophet 10 > > repair (was Hi from a new member). > > > > > > > > > Each of the 5 voices on each voice board has two > > CEM3310 envelope generators. One > > > controls the volume envelope of the voice, and > > the other controls the filter cutoff of > > the > > > voice if you bring up the filter envelope > > modulation control. If the 3310's in the filter > > > control line are faulty it should only manifest > > when you turn on the filter envelope > > > modulation. If this is off then the voice should > > sound if the VCF cutoff pot is set open. > > If > > > you have bad 3310's in the VCA envelpoe > > position, the voice won't sound. > > > > > > I am assuming that your P10 has Rev 3.x Prophet > > 5 voice boards in it, because in the > > > Sequential System Technical manual which covers > > all Prophets from Rev 3.0-3.2, the > > > Prophet 10 and the Poly Sequencer, they all use > > the same basic voice board. So for > > > instance, in Voice 1 of the voice board, U412 is > > the amplifier envelope generator, and > > > U417 is the filter envelope generator. > > > > > > --- In vintagesynthrepair@yahoogroups.com, > > "Frank Simon" <fsimon001@> wrote: > > > > > > > > Steve, > > > > I am pleased to know there is a technique to > > troube this with the bad ICs. I hope to > > get > > > to that point soon. If I remember there were no > > LEDs on control panel lit when turned > > on. > > > Is there a local spot that isolates that > > symptom? I haven't removed the top boards yet. > > > Hopefully I can handle that. > > > > > > > > I guess I am confused on VCA and VCF envelope > > positions. Can you give me a > > > explanation of how to determine which state the > > IC is in. > > > > Frank > > > > > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > From: thirteentech > > > > To: vintagesynthrepair@yahoogroups.com > > > > Sent: Friday, April 18, 2008 6:04 PM > > > > Subject: [vintagesynthrepair] Prophet 10 > > repair (was Hi from a new member). > > > > > > > > > > > > Well, if you have metered all of the power > > supply rails in the machine, and are > > satisfied > > > > that they are all in spec, then go ahead and > > put the voice boards back in. Remove the > > > > known bad 3310's, and if any were in VCA > > ENVELOPE positions, replace them with > > > 3310's > > > > from VCF ENVELOPE positions. This will allow > > you to set up a patch with the VCF > > > envelopes > > > > control turned off and still have all of the > > voices audible so that you can hear is all > > the > > > > voices are working. > > > > > > > > The EQ board on P10's was another source of > > problems too of you don't get any > > > sound. > > > > > > > > As for the sequencer board, the best way to > > test functionality is to get the rest of the > > > > machine basically playing and then just try > > out the sequencer and see if it loads and > > > plays > > > > back notes. > > > > > > > > Sounds like your power supply lines are the > > most important issue, so as I mentioned, > > > put > > > > all your attention on them being correct > > first. There are lots of CEM3310's in the > > > machine, > > > > so you can definately get the machine playing > > without 4 of them, just make sure that > > > there > > > > are good chips in the VCA envelope positions. > > > > > > > > Steve. > > > > > > > > --- In vintagesynthrepair@yahoogroups.com, > > "fsimon100" <fsimon001@> wrote: > > > > > > > > > > Steve, > > > > > Thanks, obviously I have a Rev 1. My > > schematic is a scanned copy and > > > > > didn't see the note and still don't but I > > know you are correct. What > > > > > do you think I could have damaged with the > > 12v I put in? Like I said > > > > > U931 shorted and got hot. I know that may be > > a tough question > > > > > without personally probing but the board is > > holding the 5v now. How > > > > > could I verify functionality of PCB9. > > > > > > > > > > Also if I put one of the voice boards in > > with 4 CEM3310 missing can > > > > > I continue troubleshooting? Is there a > > chance I could get confidence > > > > > from a oscope or panel lights before I buy > > four CEMs. > > > > > > > > > > --- In vintagesynthrepair@yahoogroups.com, > > "thirteentech" > > > > > <thirteentech@> wrote: > > > > > > > > > > > > The Prophet 10 service manual shows that > > U603 is a +5V for rev. 1 > > > > > machines, or +12V for Rev. 0 machines. It > > looks like that supply is > > > > > for either a 5V > > > > > > cassette drive or a 12V wafer drive > > depending on which version of > > > > > machine you have, but the schematic also > > shows a note on the 5.6V > > > > > rail of the PSU > > > > > > saying: "To PCB 9, Rev 0, not used for Rev > > 1". So depending on > > > > > whether you have a Rev 0 or Rev 1, there > > will be different supplies > > > > > on P603 pins 2 and > > > > > > 3. > > > > > > > > > > > > > > > > > > --- In vintagesynthrepair@yahoogroups.com, > > "Frank Simon" > > > > > <fsimon001@> wrote: > > > > > > > > > > > > > > Hi Steve, > > > > > > > I have a manual I downloaded from > > paintingwithsound.com. It is > > > > > hard to read. I was a little disappointed > > when > === message truncated === > > __________________________________________________________ > Be a better friend, newshound, and > know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ >
Message
Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by thirteentech