Emax

You should be swapping the indicated IC # with an IC location that is higher / different.

Then, if the ic problem is indicated during the test at this new location, that IC is likely bad.

-T

 
On Aug 16, 2013, at 3:22 AM, odyssey3001 wrote:



Hello,

The files section holds a pdf called "Emax Diagnsotics.pdf". This file seems to contain the missing pages of the service manual.

If you pull one of the RAM-chips does the error message stay the same?

As for the floppy issues: Can you swap the drive with a known good one or a floppy emulator like HXC?

Regards,

Odyssey3001

--- In emax@yahoogroups.com, "ajarlev" <ajarlev@...> wrote:
>
> Hello
> 
> I have the same problem. Eram test says is 71sbc bk01c, AD777778 ADRESS
> The emax se plus works somtimes, but suddenly it frezes up. Also somtimes difficult to load disks. I found the service manual, but the eram dignostics pages were missing.
> 
> I tried the ic cleaning on the ram board. I will try to take it out to see if there is a problem
> on the backside.
> 
> I hope someone here has the answer
> 
> -alx
> 
> 
> 
> --- In emax@yahoogroups.com, "odyssey3001" <odyssey3001@> wrote:
> >
> > 
> > Hello fellow EMAX users,
> > 
> > 
> > 
> > I recently acquired an EMAX Rack. As it seems the unit was stored in a
> > damp environment for quite some time.
> > 
> > It boots up until the "Please Insert Disk" message appears and
> > the following LEDs are lit:
> > 
> > Master, Transponse and Enter.
> > 
> > The Floppy drive did not take any disks, so a HXC-emulator was hooked
> > up.
> > 
> > It is possible to load floppy images with the HXC.
> > 
> > There is no sound, the only thing that is heard is a click sound if
> > notes are sent via midi.
> > 
> > The following measures were taken so far with measures against static
> > discharge:
> > 
> > - PCB cleaning.
> > 
> > - Reseating of all socketed ICs on the digital board, except for
> > the E-Chip because it was not possible to get it out of the socket.
> > 
> > - Results of The Internal tests: Bank RAM test passed, ERAM test
> > failed.
> > 
> > Message:
> > 
> > is80sb01 bk0ic??
> > 
> > ad000000 galpat
> > 
> > - If I remove any of the RAM chips the message stays the same.
> > 
> > 
> > 
> > To make a long story short: What can I do to bring the unit back to
> > life?
> > 
> > As for test equipment I am in possession of a scope and a logic
> > analyzer.
> > 
> > I don't know exactly where to start to look for errors.
> > 
> > 
> > 
> > 
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
>





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