emulatorII-list

everything ok - worked great - just like yesterday!!!
 
i have tried all outputs - they work, so it must be the factory 
eproms failing slowly but surely. if there isn´t a risk of damaging 
the sp12 i would rather wait until the eproms eventually die out 
completely, before we start replacing them. 
 
if you haven´t got anything to add, we can close the topic!!!

AND START A NEW ONE!!!!
 
 





--- In emulatorII-list@yahoogroups.com, "Simon Wotton" 
<simonabsent@g...> wrote:
> hey rob!!!
> 
> here is what the former owner of the sp12 had to say to the 
problem. 
> meanwhile it has worked again: yesterday everything was fine and 
so 
> i gave it a "one-day-test-run" - had it on all day, it got quite 
warm (like 
> all my other emus :-) but did the job. lets see what happens when 
i 
> power on again today...
> 
> here the email from the former user:
> 
> Simon:
> 
> I'm sorry to hear this is happening.  When I bought the SP-12 in
> 1998, it had a dead internal backup memory battery, and as a 
result would
> not hold user samples in memory for more than a minute or so after 
power
> off.  I also experienced the strange distortion noises at that 
time if I
> powered off and on again after a few minutes, but the distortion 
went away
> after clearing all memory once powered on.  This lead me to 
believe the
> distortion was due to the dead internal battery, since the ROM 
sounds are
> loaded into RAM, similar to the user samples, but are not 
automatically
> reloaded into RAM on each power up to avoid overwriting a user 
sample that
> might have been previously placed in one of the factory sound bank
> locations.  So I concluded the distortion was due to corruption of 
the RAM
> data after power off and capacitors discharging, etc. due to no 
backup
> memory power from the dead battery.  What is confusing to me about 
the
> problem you are experiencing is that after I recently replaced the
> internal battery I didn't experience the distortion problem 
anymore after
> powering off and on again later, and the user samples held their 
memory as
> well.  Before I packed the SP-12 to ship it I powered it up to do 
a final
> check of everything (including obscure features like the cassette 
save and
> SMPTE functions), and to do a final recording of the SP-12 sounds 
using a
> high quality sound card I got a few months ago, to make a mini 
sample
> library for myself, and I didn't experience any problems.
> 
> Since you mentioned you tried clearing all memory and that didn't 
work,
> one idea I can think of at the moment is perhaps to wait 5-10 
minutes
> after the SP-12 is powered on, then clear all memory and try the 
sounds.
> Perhaps a warm up time may be useful, but this is a guess, but let 
me know
> the result.  Also, if you have a voltmeter and feel comfortable 
opening up
> the SP-12, with the power off and power cord disconnected you can 
measure
> the voltage of the internal battery (yellow cylinder type).  It 
should be
> above 2.5 V or so.  Be sure to ground yourself or simply touch the 
metal
> frame before probing with the voltmeter to avoid static discharge.
> 
> Nate
> 
> 
> 
> 
>   ----- Original Message ----- 
>   From: Rob Keeble 
>   To: emulatorII-list@yahoogroups.com 
>   Sent: Tuesday, April 29, 2003 11:11 PM
>   Subject: RE: [emulatorII-list] Re: SP12 fails!!! - - - why 
always me :-(
> 
> 
>   Hi,
>   First check to see if the problem is on one particular channel 
(listen to
>   the individual outs with ROM and RAM sounds). If ROM and RAM 
sounds always
>   cause problems on a channel then its a sample replay problem in 
the analog
>   circuit for that channel.
> 
>   If all the RAM sounds are always okay and some of the ROM sounds 
are
>   distorted/high pitched, particularly if mid way through - then 
suspect the
>   factory EPROM's. EPROM chips do eventually die (yes including 
the EII and
>   SP-12 boot EPROM's....). You can easily get a new set of EPROM's 
burnt by a
>   service centre - I have the binaries. Some E1 users have already 
encountered
>   boot ROM death, and EII users will see this happening over the 
next 5 - 10
>   years. Lucky we have all the EPROM binaries available to 
recreate them!
> 
>   A service centre would also swap the sample EPROM's about to see 
if the
>   problem is the chip or the replay electronics. Please don't 
attempt repairs
>   without thr right equipment/training and the power OFF.
> 
>   Rather Off Topic...if any one is interested in the factory SP-12 
samples in
>   LM-4 format....let me know!
> 
>   Regards
>   Rob
>   www.emulatorarchive.com
> 
>   i have tried it again today...
> 
>   looks like these noisy sounds have now become a permanent error 
on
>   my sp12. when i switched it on again today, there were the same
>   things going wrong as yesterday. i can say more about the problem
>   now, because i have tested a few things:
> 
>   - tried to put user sounds on the "failing" drum-buttons, that 
works
>   fine. i also have a list of all the factory-drums making the
>   described problems.
> 
>   snare1 (completely)
>   snare2 (completely)
>   ride1  (completely)
>   ride2  (completely)
>   crash  (just a slight bit of the end)
> 
>   i have recorded the failure and will send you an email, with an 
mp3
>   attached. you can answer me via email if you want - or in the 
forum,
>   depending on your oppinion wether this could be of any interest 
for
>   other users...
> 
>   thanx in advance and please don´t destroy all my hopes of me,
>   eventually haveing all my emu´s working 100% - ok :-(
> 
>   simon
> 
> 
> 
> [Non-text portions of this message have been removed]