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Re: Disk ][ Drives not working

Subject: Re: Disk ][ Drives not working
From: David Wilson <david@uow.edu.au>
Date: 3 Jul 2004 10:42:26 +1000
Newsgroups: comp.sys.apple2
Organization: University of Wollongong
References: <pan.2004.06.30.23.17.16.824452@alirossdotco.uk> <JoJEc.19790$Fo4.263681@typhoon.sonic.net> <pan.2004.07.01.09.07.07.214677@alirossdotco.uk> <EAVEc.19853$Fo4.264959@typhoon.sonic.net> <pan.2004.07.02.11.21.49.257301@alirossdotco.uk> <UScFc.20013$Fo4.267728@typhoon.sonic.net> <xn0dkap771j071001@powernews.libero.it> <6c6dnRaHjfvu63jdRVn-tw@comcast.com> <nospam-412BD7.11523702072004@news-server-fe-02.columbus.rr.com>
User-agent: nn/6.6.5
Xref: g2news1.google.com comp.sys.apple2:1679

"John B. Matthews" <nospam@nospam.com> writes:
>analog card inside the drive. I seem to recall folks saying it 
>blew the "read sense amplifier" chip, luridly recounting how it 
>would smoke and be visibly burned afterward. Is that the 
>"ULN2003" you mention?

The Read Sense Amp is the MC3470 IC. The ULN2003 is a high voltage, high current
darlington array IC used to drive the stepper motor phases.
-- 
David Wilson  School of IT & CS, Uni of Wollongong, Australia

References:
- Disk ][ Drives not working
  - From: Alistair J Ross <mailat@alirossdotco.uk>
- Re: Disk ][ Drives not working
  - From: Don Bruder <dakidd@sonic.net>
- Re: Disk ][ Drives not working
  - From: Alistair J Ross <mailat@alirossdotco.uk>
- Re: Disk ][ Drives not working
  - From: Don Bruder <dakidd@sonic.net>
- Re: Disk ][ Drives not working
  - From: Alistair J Ross <mailat@alirossdotco.uk>
- Re: Disk ][ Drives not working
  - From: Don Bruder <dakidd@sonic.net>
- Re: Disk ][ Drives not working
  - From: "Igor" <ikanja@despam....com>
- Re: Disk ][ Drives not working
  - From: "Bill Garber" <willy46pa@comcast DOT net>
- Re: Disk ][ Drives not working
  - From: "John B. Matthews" <nospam@nospam.com>

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