Path: utzoo!mnetor!uunet!husc6!bloom-beacon!think!ames!aurora!labrea!decwrl!decvax!bhjat!bhj
From: bhj@bhjat.UUCP (Burt Janz)
Newsgroups: comp.sys.att
Subject: Re: More HD on my 3b1.  How?
Message-ID: <176@bhjat.UUCP>
Date: 22 Jan 88 00:50:38 GMT
References: <7637@alice.UUCP>
Organization: BHJ Associates, Nashua, NH
Lines: 28
Summary: So what do I have?

In article <7637@alice.UUCP>, wilber@alice.UUCP writes:
> I only have a 3b1 but I understand that there are a few important differences
> between the 3b1 and the 7300.  One of them is that on the 3b1 the power to the
> disk is taken directly from the power supply, whereas on the 7300 the power to
> the disk is routed through the motherboard (or so I have heard).  So just

Now I'm confused.  The monitor says "ATT UNIX PC", the box says "3B1", and
support says that I have a 3B1.  But, the power supply IS routed on the 
motherboard.  I found this out when my system went dead.

I shut my system down over the Christmas holiday weekend to prevent any
possible problems from power outages.  So, I came in on Monday and turned
the system on.  Noise, dots on the screen... and more dots... and more dots...

The hard disk never went through it's initialization.  I took the system
home, opened it up, and used my DVM to check the power supply.  There are two
sets of power cables on the motherboard: one for the hard disk, and one for
the floppy.  The floppy showed both 5v and 12v, but the hard disk showed only
the 12v.  Using the DVM, I discovered that the board runs from the power
supply went to both the cable sets... parallel connection.  So, I resoldered
the wires to the motherboard, and... POWER!!!  A bad solder connection.

Please note that I said that the power runs were on the motherboard.  My
system is (supposedly) a 3B1.  So, do I have a 7300 in a 3B1 wrapper?

Burt Janz
..decvax!bhjat!bhj
..decvax!bhjatt!bhj