Re: Prophet 10 repair (was Hi from a new member).
2008-04-29 by thirteentech
BTW, I should mention that running RAM tests on the Prophet will of course erase any user memories stored in the machine. ... opposed ... of ... RAM ...
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Re: Prophet 10 repair (was Hi from a new member).
2008-04-29 by thirteentech
I am not certain what the P10 s last OS revision was, the highest that I have seen on a Prophet 5 is V9.3. Looking at the schematics of the 2 machines the CPU
Re: [vintagesynthrepair] Re: Prophet 10 repair
2008-04-29 by Philip
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.
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-29 by Frank Simon
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
Re: [vintagesynthrepair] KORG SAS problem
2008-04-28 by Philip
Sounds broken reading this: http://www.keyboardmuseum.org/ar/k/korg/s/sas20.html Tried Korg for a service manual? ...
KORG SAS problem
2008-04-28 by marianlucy
Help- DO I need a cartridge for this keyboard to work? All it does is a couple of rhythms - no keys work at all- any help please? Anyone have instructions or a
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by Roy J. Tellason
... If I felt one that was warm I d say that part warranted further investigation, maybe scope it or something... ... Because I don t recall RAM running all
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by Philip
... I wouldnt say most...some do, some don t is better. Anyway most is hardly an accurate diagnosis tool :o) ... 4116 and derivatives..why? Ok too hot to
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by Roy J. Tellason
... Well, most CMOS should not feel at all warm to the touch. ... Which ones are those? -- Member of the toughest, meanest, deadliest, most unrelenting -- and
Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by fsimon100
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
Re: Prophet 600 troubleshooting....Digital Side.
2008-04-28 by inocencio66
... it, and gibberish on the numerical readout. ... maybe tell me some more directed things to try? ... Hi, I do not have a P600 but my Matrix 1000 suddenly
Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by thirteentech
What is written on the stickers on the EPROMS? ... http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
Re: Sh-101 problem
2008-04-28 by inocencio66
... get ... brought this ... devices, ... factory ... for high ... you ... a socket ... changes. A ... Masters ... lies. --James ... Well, the D80C49Cs have
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by Frank Simon
I don t know. How do I find this out. ... From: Stephen Jones To: vintagesynthrepair@yahoogroups.com Sent: Monday, April 28, 2008 12:14 AM Subject: Re:
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by Philip
Surely the machine should still boot up as those chips are nothing to do with the CPU circuit.. Warmth of IC s give no clue to failure. Some ram chips get
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by Stephen Jones
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
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-28 by Frank Simon
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
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-22 by Frank Simon
Further checking even though the 5v to PCB 9 is up I realized the resistance across the rail was 400ohms so I isolated it down to a second dual flip flop that
Re: [vintagesynthrepair] Re: Sh-101 problem
2008-04-21 by Roy J. Tellason
... I was wondering how long it was going to take before somebody brought this up. :-) ... Nope. ... That s incorrect. Those are not One-time Programmable
Re: [vintagesynthrepair] Re: amplifier spitting out noise? (off topic?)
2008-04-21 by Antoine Deschênes
That s possible too, but both the socket and the tube need to be changed. (At least it doesn t cost $40 worth of cleaning products) ... -- Antoine Deschênes
Re: Sh-101 problem
2008-04-21 by oxygeno1313
You can t just replace the CPU 8049 with another 8049, you need get it from roland if still available or from other 101 working CPU. The fact is that the CPU
Re: [vintagesynthrepair] Re: amplifier spitting out noise? (off topic?)
2008-04-21 by Philip
I normally just buy a new one.. Phil. ... __________________________________________________________ Sent from Yahoo! Mail. A Smarter Email
Re: [vintagesynthrepair] Re: amplifier spitting out noise? (off topic?)
2008-04-21 by GB
... Re-tension the pins on the tube socket. I usually use a tiny screwdriver or similar pokie thing to force the female bits to be a little tighter. I think
Re: Prophet 10 repair (was Hi from a new member).
2008-04-21 by thirteentech
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
Re: [vintagesynthrepair] Re: amplifier spitting out noise? (off topic?)
2008-04-21 by Antoine Deschênes
You can look for cold solder joints on the socket, but if alcohol helps, the socket and tube pins probably needs to be cleaned. You ll need Caig DeoxIT and
Re: amplifier spitting out noise? (off topic?)
2008-04-21 by cockandswan
thanks for all the help on this so far guys, i found out that it s one of the tube sockets! i have tried cleaning it with straight alcohol, and it fixes the
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-21 by Philip
Does sound like a logic problem to me... Phil. ... === message truncated === __________________________________________________________ Sent from Yahoo! Mail.
Re: [vintagesynthrepair] Re: Prophet 10 repair (was Hi from a new member).
2008-04-20 by Frank Simon
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
Re: Prophet J wires
2008-04-20 by normandickinson
Try the link http://www.allen-heath.com/UK/companyinfo.asp which give the history of Allen-Heath, and there is also a link on thaat page to their old products.
Re: [vintagesynthrepair] Roland VP-330 no vocoder fault
2008-04-20 by Philip
Hi thanks, I got it fixed a while ago, It was a dead TL082 op-amp(IC2)located in the vocoder board known as ETH16..mine has the push switches by the way not
Re: [vintagesynthrepair] Roland VP-330 no vocoder fault
2008-04-20 by akira honda
hi, i had a similar problem long time ago, i own 2 VP-330 and both had the same problem, i replaced the op amps from each filter, also check the rocker
Re: Prophet J wires
2008-04-20 by pigeonbreath
Pratt-Read. Right. I must be losing my mind. Or wig. Or something. Thanks for the correction. Th.B. Nast ... why you
Re: Prophet 600 troubleshooting....Digital Side.
2008-04-20 by eggwheatis
Well like I say it s way cheaper than that guy sells them for...they come on ebay a lot...I used to fix a lot of old arcade machines like space invaders etc
Anyone heard of 'Chiri plugs' ?
2008-04-19 by nik_a777
Hello group, currently I am trying to refurbish an old Digisound modular synth. This is my first attempt at synth diy so i m quite ignorant. I have fitted a
Re: Jupiter 4 calibration + Voice pre-set fixed!
2008-04-19 by eggwheatis
Cool...I fixed the problem with the voice pre-set and it s one you might want to write in your factory anomalies section..my hunch (below) was right..I
Re: [vintagesynthrepair] Re: Prophet 600 troubleshooting....Digital Side.
2008-04-19 by Roy J. Tellason
... Thanks. ... Looks nifty, but it d have to be *way* cheaper than what he s talking about there for me to even think about it. :-) And then there s the
Re: [vintagesynthrepair] Re: Prophet 600 troubleshooting....Digital Side.
2008-04-19 by Roy J. Tellason
... Hey, it made me feel pretty good to look at those diagrams and know exactly what I was looking at and to be able to come up with all that just off the top
Re: Prophet 600 troubleshooting....Digital Side.
2008-04-19 by eggwheatis
Forgot to say I wouldn t remove the 8253..I think its the I/O timer.. Phil.
Re: [vintagesynthrepair] Re: Prophet 600 troubleshooting....Digital Side.
2008-04-19 by Philip
Good info Roy...Brendan, the circuit looks quite simple compared to a lot of things i ve seen so you should be ok! I actually have a thing called a Fluke 9010
Re: [vintagesynthrepair] Re: Prophet 600 troubleshooting....Digital Side.
2008-04-19 by Brendan Haley
Wow! Thanks, this is AWESOME info....and quick too. (From Everyone....) I really appreciate it. I will give it a shot and let you know what I find! -brendan
Re: [vintagesynthrepair] Prophet J wires
2008-04-19 by Roy J. Tellason
... Who hasn t? :-( -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that
Re: [vintagesynthrepair] Re: Prophet 600 troubleshooting....Digital Side.
2008-04-19 by Roy J. Tellason
... Yup, I looked through the diagrams pointed at, and the behavior described can only be a matter of the last couple of them in there... First thing I d do
Re: [vintagesynthrepair] Prophet J wires
2008-04-19 by Malte Rogacki
... I thought they were built by Pratt-Read? -- Malte Rogacki gacki@gacki.sax.de ... Don t forget to TURN ON THE SYNTHESIZER. Often this is the reason why you
Re: Prophet 600 troubleshooting....Digital Side.
2008-04-19 by eggwheatis
If it were me and I know nothing about this synth by the way...I d start by looking at the PSU with a scope....then assuming this is perfect I d be looking
Prophet J wires
2008-04-19 by pigeonbreath
FWIW, I replaced the broken J-wires in the Prophet 5 keyboard with 0.38mm guitar wire(D Addario PL015, to be specific). Silver solder was used. Seems strong
Re: [vintagesynthrepair] Prophet 600 troubleshooting....Digital Side.
2008-04-19 by Brendan Haley
I actually have a copy of the service manual. But I do not believe it is available for download anywhere. There are schematics in pieces here:
Re: [vintagesynthrepair] Prophet 600 troubleshooting....Digital Side.
2008-04-19 by Roy J. Tellason
... Is there any service information on this unit available online to download? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest
Prophet 600 troubleshooting....Digital Side.
2008-04-19 by Brendan Haley
Is there anyone out there that has experience troubleshooting problems with the Prophet 600, specifically the digital side of things? I have a broken Prophet
Re: Jupiter 4 calibration + BA662 update
2008-04-19 by eggwheatis
Ok fixed the bender circuit... The problem with the voice pre-set sound is that the calibrations make the separate module board VCF trimmer settings too low.
Re: Prophet 10 repair (was Hi from a new member).
2008-04-19 by thirteentech
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