On Tuesday 29 April 2008 04:37, Philip wrote: > Eproms do not need a battery to hold data..it's > permanent(sort of). > > Im not being funny but a lot of your questions are > answerable with a quick google search. for instance: > > http://en.wikipedia.org/wiki/EPROM > > You should do that before asking on lists as you will > gain a much better understanding reading some good > articles. > > Also without some basic understanding of how synths > and basic digital electronics work..IE old CPU's rom , > ram busses...you are going to be pretty much stabbing > in the dark here unless you are lucky. > > I suggest spending some time reading up and > researching properly..I honestly don't mean any of > this in a patronising way. I just think it will help > you to move forward and achieve your goal. > > I believe there are some very good books out there on > these subjects. > > Phil. There's a fairly good set of books covering the basics here: http://www.allaboutcircuits.com/l_sitemap.html If you hit the "pdf" link on the top right corner of each page, you can download the whole books... :-) > --- Frank Simon <fsimon001@...> wrote: > > On Brd 3 there are three EPROMs with the Z80 CPU. > > The first says: 0 TEN 5.0, second says: 1 TEN 5.0, > > third says: 2 TEN 5.0 on their stickers. > > > > On Brd 9 there is one EPROM with the Z80 CPU. The > > sticker on it is not too legible what I do see is: > > SEQ (that part is clear) below it say C1 or C.1 or I > > was thinking maybe 2.1( if upper half of 2 was > > missing). > > > > Both Z80s on pin 6 CLK have 2.5MHz clock at about 4v > > p-p. and 5v dc on pin 11. Does the EPROM lose all > > programming if battery dies? If so how do you > > reload? Will keyboard not boot without EPROM > > program. My friend today is bringing me a Z80 CPU in > > so I can swap out. > > > > > > > > ----- Original Message ----- > > From: thirteentech > > To: vintagesynthrepair@yahoogroups.com > > Sent: Monday, April 28, 2008 7:47 AM > > Subject: [vintagesynthrepair] Re: Prophet 10 > > repair (was Hi from a new member). > > > > > > 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@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 > > === message truncated === > > > > __________________________________________________________ > Sent from Yahoo! Mail. > A Smarter Email http://uk.docs.yahoo.com/nowyoucan.html > > ------------------------------------ > > Yahoo! Groups Links > > > -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin
Message
Re: [vintagesynthrepair] Re: Prophet 10 repair
2008-04-29 by Roy J. Tellason