Vintage Synth Repair

Cool..I checked with my electronics guru friend and he
said I am correct about this.

5114 5514 is used in old arcade games like Williams
Robotron or Joust btw, so check vintage arcade part
suppliers too.

Good luck, Phil.


--- Frank Simon <fsimon001@...> wrote:

> I am going to take your recommendation and get the
> 5114. The 2114 was a quick troubleshooter.
>   ----- Original Message ----- 
>   From: Philip 
>   To: vintagesynthrepair@yahoogroups.com 
>   Sent: Saturday, June 07, 2008 1:30 AM
>   Subject: Re: [vintagesynthrepair] Re: Prophet 10
> dead
> 
> 
>   Yeh...Scratchpad can use standard 2114. NV ram =
> Non
>   volatile IE User patch memory..which is obviously
>   battery backed-upped and so uses 5114/6514 CMOS
> ram
>   due to it's low current drain. 
> 
>   Therefore the 2114 will probably drain the memory
>   battery very quickly due to the higher current
> drain
>   of NMOS technology.
> 
>   2114 is not compatible with 5114 in this
> situation,
>   sure it will get it to work in the short
> term..I've
>   done it myself popped in a 2114 to check
>   circuits...5114 5514 6514 D444C are all crosses of
>   each other. They are all hard to find too. 2114 is
>   easy to get.
> 
>   If anyone knows better you are welcome to correct
> me
>   of course!
> 
>   Phil.
> 
>   --- Frank Simon <fsimon001@...> wrote:
> 
>   > I like to hear these details. Off the decoder is
>   > NV1,NV2, and Scratch RAM. On my schematic my
>   > scratchpad RAM are two 2114s. The part that
> failed
>   > was as you know a D444C and was part of NV1. All
> of
>   > these are 1K x 4bit. The NV memory on my
> schematic
>   > say 6514. But at least putting the 2114 in
> showed me
>   > the failed part. If you think the 6514 is more
>   > compatible with 5114 I'll replace it. Do you
> know
>   > details of 6514.
>   > 
>   > 
>   > ----- Original Message ----- 
>   > From: Philip 
>   > To: vintagesynthrepair@yahoogroups.com 
>   > Sent: Friday, June 06, 2008 9:43 PM
>   > Subject: Re: [vintagesynthrepair] Re: Prophet 10
>   > dead
>   > 
>   > 
>   > Well you should have used a 5114 not a 2114,
> that
>   > I'm
>   > pretty sure of, will cause you problems.
>   > 
>   > A 2114 is not a cmos device, it is an
>   > nmos..therefore
>   > they use different currents..a D444 is pretty
> fast
>   > too
>   > 12ns or something.
>   > 
>   > For instance patch memory: a 5114 connected to a
>   > 3v
>   > lithium battery will last years..but with 2114
> it
>   > will
>   > last a few days.
>   > 
>   > Perhaps others with better knowledge than me on
>   > this
>   > subject can explain further?
>   > 
>   > Phil.
>   > 
>   > --- Frank Simon <fsimon001@...> wrote:
>   > 
>   > > I found an Motorola MCM2114P45 from a ebay
>   > seller
>   > > for $3. I was hesitant because it was their
>   > slowest
>   > > access time part at 450nS. I don't know what
> the
>   > > D444C access time spec is. I figured it was
>   > around
>   > > 200nS but hopefully the 450 is ok.
>   > > 
>   > > 
>   > > ----- Original Message ----- 
>   > > From: Philip 
>   > > To: vintagesynthrepair@yahoogroups.com 
>   > > Sent: Friday, June 06, 2008 8:21 AM
>   > > Subject: Re: [vintagesynthrepair] Re: Prophet
> 10
>   > > dead
>   > > 
>   > > 
>   > > Excellent news, well done..so did you use the
>   > Ram
>   > > I
>   > > suggested? Or did you find a 444?
>   > > 
>   > > Thanks, Phil.
>   > > 
>   > > --- fsimon100 <fsimon001@...> wrote:
>   > > 
>   > > > I truly had a great day. I replaced a 1Kx4
> RAM
>   > > and
>   > > > resolved my 
>   > > > computer problem on my P10. Now all LEDs
> light
>   > > up
>   > > > and the unit 
>   > > > behaves somewhat functional. Upon turn on
> the
>   > > unit
>   > > > goes to tune cycle 
>   > > > then all LEDs light up and entire panel is
>   > > > functional. Still no sound 
>   > > > but this is a great milestone. Two problems
> I
>   > > see
>   > > > are sequential 
>   > > > board is dead which I think I'm on top of.
>   > This
>   > > is
>   > > > PCB9 which I over 
>   > > > voltaged when I put the 12V regulator in
>   > instead
>   > > of
>   > > > 5V (due to poor 
>   > > > documentation this is an option for tape or
>   > > wafer
>   > > > drive). I think 
>   > > > this will be easy to fix but I was hoping to
>   > > help on
>   > > > one clue. There 
>   > > > is a window showing voices 1 thru 5 and
> below
>   > 6
>   > > thru
>   > > > 10. The top 1 
>   > > > thru 5 show 1,3, and 4 LEDs on continously
>   > never
>   > > > changing. The bottom 
>   > > > 6 thru 10 change as I hit the keys as if it
> is
>   > > > responding however LED 
>   > > > 7 never comes on. Can someone offer advice.
> I
>   > > have 4
>   > > > CEM3310s out on 
>   > > > the top voice board. It is to my
> understanding
>   > I
>   > > may
>   > > > get a noise out 
>   > > > if configured right to see functionality
>   > before
>   > > I
>   > > > buy expensive chips.
>   > > > 
>   > > > Sorry long but I am very happy to be at this
>   > > status.
>   > > > Can sequencer 
>   > > > shut down operation. Was curious, should I
> get
>   > > sound
>   > > > without 
>   > > > sequencer.
>   > > > 
>   > > > 
>   > > > 
>   > > > --- In vintagesynthrepair@yahoogroups.com,
>   > > "Frank
>   > > > Simon" 
>   > > > <fsimon001@...> wrote:
>   > > > >
>   > > > > I did find a chip pulling down DB4 on U311
>   > it
>   > > is a
>   > > > 6514 4K CMOS 
>   > > > RAM. Thank god for IC sockets. The only
>   > problem
>   > > I'm
>   > > > a little confused 
>   > > > on a cross for it. It appears obsolete. It
> is
> 
=== message truncated ===



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