That I can find out when I get home tonight. I have seen the sticker on the EEPROMs. This machine has two Processors correct? One on PCB9 and another up by the DAC. Is there EEPROM in both locations? I'll be able to tell. Thanks --- In vintagesynthrepair@yahoogroups.com, "thirteentech" <thirteentech@...> wrote: > > 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@yahoogroups.com > > > > 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@...m, > > > "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 fsimon100