Micropolis 1355 ESDI drive problems.

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1 total messages Started by Frans Meulenbroeks Mon, 23 Nov 1992 10:30

#1282

Author: Frans Meulenbroeks
Date: Mon, 23 Nov 1992 10:30

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Hi,

My 1355 drive gave up last week. Since I had a spare one lying around, I
decided to look into that one. However, I discovered the following
problems:
- the spare one works, but thinks it has only 3 heads instead of 8.
  Is there any way to convince it that it has 8 heads? I tried it, but
  could not get it to use its other heads.
- In order to salvage the data I tried to swap the interface and motor
  control boards of both drives. The old 1355 comes up, but thinks it
  has 3 heads. So the three head info must be stored on the interface
  board. Also it must be the interface board from my old drive that is
  bad, since otherwise it would not come up with the spare boards.
  Does anyone know if it is possible to repair the original board.
  The symptoms of the failing drive are: when the drive is powered the
  led turns on. If the drive comes to speed the led used to go out, but
  now doesn't any more. The led just stays on. No blinking of error
  codes. The drive also does not respond on commands.

Anyone any suggestions? Or probably schematics??

PS: Now I know why I always made backups :-)

--
Frans Meulenbroeks		Philips Research Laboratories
preferred email address: 	meulenbr@prl.philips.nl

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