emulatorII-list

Ups...that was what i just sugested :-)
lots of traffic on the E II mailinglist :-)

Am Samstag, 06.09.03 um 01:22 Uhr schrieb Rob Keeble:

> 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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