E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - checking floppy ... locked

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+  E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP
|-+  General Category
| |-+  Emax II Technical Issues / Tips
| | |-+  checking floppy ... locked
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audioaddictz
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« Reply #15 on: May 27, 2014, 11:05:57 AM »

This is my process of diagnosis on the emax II

first thing i checked was the power supply .. which in this emax is non standard
its been upgraded and the supply rails are stable and no sign of ware
or damage .

so with that ruled out i moved onto the floppy drive

Powered the system with floppy drive attached -- Result ( Checking
Floppy - System Locked )
Powered the system with my pc floppy drive attached -- Result (
Checking Floppy - System Locked )
Powered the system with no drive attached -- Result ( Checking Floppy
- System Locked )

in all 3 cases the diagnostic lights on the front showed an error with
either floppy drive or controller

pdf for diagnostic http://synthark.com/synthesizer-museum/emu-gallery/emulator-archive/manuals/


so as i knew my drive was working but it failed in the emax and it
failed with no drive attached as well i surmised that it was the
controller chip at issue ..as the original emax drive reacted like my
working drive .. i took it that the drive was ok

.. so next was to do some research to find out which chip was the
floppy controler

a bit of googling and help in this forum  post ...found it to be the  WD1772-ph 02-02

after locating it on the pcb i discovered it was soldered directly to
the pcb rather than in a socket as in later versions of the emax :/
i had to take the sampler completely apart so i could get to both
sides of the pcb

this made the job of replacing it considerably more difficult as there
are 28 legs to de solder on both sides of the pcb to remove it ...
which is quite tricky to do

once the chip was removed and all the lpads cleaned up i then fitted a
28pin dip socket for the new chip to sit in .. so that if ever goes
again it will be a simple job to replace the chip

rebuilt the sampler

Powered the system with floppy drive attached -- Result ( Checking
Floppy - System Locked )
Powered the system with my pc floppy drive attached -- Result (
Checking Floppy - checking scsi ...looped )

this lead me to believe that when the chip went originally that it
took the drive with it .. or vice versa

then this morning i took a standard floppy drive and did a small modification and
swaped the drive id from d1 to d0

. plugged it back into the emax .. and it boots

working sampler

just need to screw it all back together


Photos coming soon
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Reality ..... it might look the same but it don't taste the same
audioaddictz
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« Reply #16 on: May 27, 2014, 12:54:33 PM »

Photos

http://www.facebook.com/media/set/?set=a.10153080903654572.1073741864.573014571&type=1&l=0c4a58594e
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Reality ..... it might look the same but it don't taste the same
FmK@77
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« Reply #17 on: June 08, 2014, 10:47:19 AM »

Did you check if the IDE cable or the pin-layout for the floppy-drive isn't broken?

Kind regards,
Frank
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audioaddictz
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« Reply #18 on: June 08, 2014, 03:08:02 PM »

i never changed the floppy cable ... the problem was with the controller chip and the floppy drive its self .. once both were replace all was fine
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Reality ..... it might look the same but it don't taste the same
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E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - checking floppy ... locked

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