emu iii CRASH

[ARES]

No i've no scsi device hooked.

here is my opened EMU :

http://cjoint.com/?gjlhzEzjEG

[dr.c]

GIVE ME 10 MINUTES...

[dr.c]

Okay...

Most of the poeoplen, when they re-assemble an EII, put the SCSI cable wrongly, like this :

http://cjoint.com/?gjlBeOynVl

When thay close the machine, the cable is pressed between the cpver and the card cage and the pins if the components of the cover make holes and shorts to the cable, occuring shorts.

You didn't do it ! Congratulations !
(You would not imagine what stupid things people do...)

Okay : do you have any SCSI devide attached on the EIII ?

Does it hang all the time ? At start-up, or sometimes ? When you play ?

What happens if you just leave it powered "ON", will it crash by itself ?

Is it connected on MIDI (Out, In, Thru) ?

Lots of questions, uh ?


 

[ARES]

I've no exterior SCSI device ( the only one is the hard disk inside )

It sometimes turn on without problem and sometimes no and never, at this time because i got my EMu for less than  2 weeks ,  when i play

What happens if you just leave it powered "ON", will it crash by itself ? => I didn't know because it crash directly when i turn it on

I 've connected still no midi device plugged

[ARES]

When i take the tension in the pin with the yellow circle , i've  + 4.96 V

http://cjoint.com/?gjl058nf53

[dr.c]

To be ABSOLUTELY SURE : what kind of circuit is it ?

It should be normaly 5,05 V !!!

This is why I asked you since the beginning, because there is a loss on line, if you adjust it to 5,05 V, you will see at the power supply almost 6,3 V !

[ARES]

What do you mean by what kind of circuit ?

How can i precise it to you ? You mean the model wrote upon the circuit ?

[dr.c]

Yes, exactly !

If it is :

SN74xxx
SN74LSxxx
SN74HCTxxx

its 5,05 V

[ARES]

I've CD74HCTxxxx and not SN74HTCxxx : it's the same
and i've another SN74ALSxxx ...

[ARES]

I've just adjust at  + 5,05 V but the EMU appears like before as shown in my picture ...

Any idea to exit from this hell ?

[dr.c]

Find another disk and put it there, even temporarily. You can put two sheet of paper on the old one without even moving it, (vhite and unused paper, I mean with no ink, some inks are conductive), put the other disk on top of it, plug it, no matter if there is sofware or not on it, don't worry, you don't even have to format it, its just to see !

If the display goes ok and scans disks, it means your disk is faulty.

If this disk is faulty, don't throw it away, I know how to fix it with a probability of 80%.

[ARES]

My EMU goes know ... it's a stranger behaviour ...
I keep your idea with a second hard disk , in case ...

Thanks a lot  for your excellent help Dr.C. ...
Our EMU are not alone in this world ... , someone, somewhere, in sometimes keeps on  watching ! 

PS : better is :
-  change totally the HD by another one with some giga's ?
-  or put a zip drive is a better idea ?

[dr.c]

You will have problems with zip drive. Forget it.

Cheers

[ARES]

HI everybody,

Long time before i post because of the job.

I have use my EMU  a very little bit for time to time ... sometimes it worked , sometimes it crashed at the boot  ( as before , ... up in the topic ) , sometimes it crashed after a time , somtimes i read a message like "SYSTEM ERROR UND "...

I've tried , this morning , to change the HD  by another one ( just to see what happens ) like said Dr.C ... the result is that sometimes the front panel is ok ( no lights )  and sometimes it lights up ( always the same : supermode,segment,song,record,erase,prest management and digital processing )

Any idea

[dr.c]

Are you absolutely sure the SCSI flat cable passes at the right place, that it is not piched between the cover and the card cage when you close the machine ?

I donn't think your machine has a breakdown, there is a bad contact somewhere.