EmulatorII-list

Hi,
The problem is the power supply. It needs to be cheked and repaired - Rob

To Rob Keeble (and all others)
I have a news, regarding my problems. Today I've discovered the 
following new facts:

The problem #2:
Let's say it's morning. So, I try to turn on my EII for the first 
time - It freezes (the display is showing "boot in process", several 
LEDs are shining constantly). I turn it off - then turn it on again - 
the same thing. After several turn offs and ons - the same picture, 
but the disk drives start to make a noise. After another several turn 
offs and ons - EII starts to ask a disc to be inserted - and loads 
and works OK (except the problems 1&3). SO! Since this moment, if I 
try to turn it off - then turn on again - my EII will be always 
booting ok and asking for the disk.
In other words, there is an effect of "warming up" - after many turn 
offs and ons - it always starts and boots ok. But if I turn it off 
for some more time (say, several hours) - it then starts to freeze 
again.
I hope this fact can give you some more understanding of my problem.

The problem #3:
I think it is not the memory, because I found out that after the 
sound is became distorted or even if it "came to silence" - it can be 
playing normal again after some time. This evening, I managed to play 
the presets without the problem #3 during more than 1 hour... I 
suppose, this means that the memory is OK. If I right here, then what 
could be the reason for this problem?

Can you recommend me something more detailed after this new 
information from me? Thank you very much!

***
To Simon:
I live in Moscow, Russia. So, Vienna service is quite far from me :)
Thank you very much, anyway...

***
To Dana:
OK, thank you very much. I'll try to do it tomorrow, when I'm 
planning to open up my EII.

Grigory


--- In emulatorII-list@yahoogroups.com, "Rob Keeble" <rob@e...> wrote:
> Hi,
> Welcome aboard!
> 
> 1. Sounds like the sampling input electronics are in trouble, have 
a look at
> IC62. Check the Sample Gain control is okay and the wiring to the 
sample
> input jack.Replacing the Sample and Volume pots is HIGHLY 
recommended - it
> can really improve the sample and replay sound quality. Use BOURNS 
or
> SPECTROL conductive plastic pots.
> 
> 2. Could well be a power rail out of spec. The firmwave from the 
boot ROM
> has loaded okay, but the EII is failing to load the OS from 
diskette. Check
> the +5V rail on the digital board, and that +12V is on the floppy 
drive.
> 
> 3. Thats bad RAM or a microcontroller problemo. Not good news..
> 
> However start by checking the power supply rails are all okay 
(break out
> that DVM), as the PSU is a weak spot in the EII (and EI and EIII and
> Emaxs...). Check the power rails are supplying the right voltages 
onto the
> digital and analog boards - as the Molex connector on the PSU PCB 
is famous
> for being useless. It is often removed or soldered up.
> 
> Once you are confident that the boards have the right power, you 
can then
> chase down the problems from there. Keep in touch!
> 
> Regards
> Rob
> www.emulatorarchive.com




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