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From: Patrick Schaefer <pa.schaefer@fz-juelich.de>
Newsgroups: comp.sys.apple2
Subject: Re: Technical question... continued !
Date: Wed, 17 Dec 1997 09:27:35 +0100
Organization: Forschungszentrum Juelich GmbH
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To: eib@club-internet.fr
Xref: news1.icaen comp.sys.apple2:128382

eib wrote:

> 1) The Apple II does not boot. It makes a sort of "bi....bi....bi..."
> noise, like a short boot beep that loops.
> 2) The Apple boots, and the drives load nothing (the red light is lit,
> but it does not read the disk).

You plugged in the drive cable the wrong direction (180=B0 rotated). This=

will kill the 74LS125 and the ULN2003/XR2003 on the Disk ][ Analog
Board. Try booting for some time and you'll see some smoke coming
outside the drive. This is the 2003 chip.

Replacing the chips is easy. Get a new one from your local electronic
shop, remove the old chip from its socket and insert the new one. With a
working 2003 you should be able to move the RW head ('PR#6' -->
'grrrzzz'), the 'LS125 is required for read/write operations.

Patrick