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From: russotto@eng.umd.edu (Matthew T. Russotto)
Newsgroups: comp.sys.mac.hardware
Subject: Re: CMS PD-600 Hard Disk and the Mac IIfx; desparately seeking advice
Message-ID: <1991Jan28.055228.976@eng.umd.edu>
Date: 28 Jan 91 05:52:28 GMT
References: <1991Jan26.135408.12332@zaphod.mps.ohio-state.edu>
Sender: news@eng.umd.edu (C-News)
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 25

In article <1991Jan26.135408.12332@zaphod.mps.ohio-state.edu> nevai@mps.ohio-state.edu (Paul Nevai) writes:
>HELP!!! HELP!!! HELP!!! HELP!!! HELP!!! HELP!!! HELP!!! HELP!!! HELP!!!
>
>I have a CMS PD-600 Hard Disk (a Wren V: 94181-702) and a (new) Mac IIfx.
>
>Problem: when I removed the (internal) terminators from the Hard Disk (as I
>am supposed to) it stops working, i.e. doesn't not spin up when I turn on
>the power. As such I can't use it with the IIfx since that requires the new
>(black) terminator. The drive works flawlessly with the normal internal
>terminators (on a Mac II, say).
>
>Can anyone advise me  what to do

First, make sure you have removed the right chips-- there are other resistor
packs on board.  The two you want are PROBABLY below and slightly offset
left of the power connector for one, and the other far to the left, on the
other side of the SCSI cable-- I say probably because that's the way it is on
my Wren IV.  Call Seagate's technical support BBS, and check out the
file sections-- you want the specs on the ST4702N.  (number is 408-438-8771)
The other thing you want to do is make sure the motor start enable pin is
NOT jumpered.  On my Wren IV that is the two vertically set pins just to the
left of the SCSI ID pins, on the same jumper block.
--
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
     .sig under construction, like the rest of this campus.