Flickering Rainbow.

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2 total messages Started by $$$I$JV Thu, 03 Dec 1987 02:20

#1251

Author: $$$I$JV
Date: Thu, 03 Dec 1987 02:20

25 lines
2071 bytes

Date: 2 December 1987, 20:02:18 LCL
From: William Kirchhoff         904-392-4601         $$$I$JV  at NERVM
To:   INFO-DEC-MICRO at SCORE.STANFORD

  With all the discussion taking place over the last few weeks, I have
hope that more interesting things can be achieved. This is just a short
note in light of the discussion on Rainbow problems from turning on and
off the system. My system over the last few months has started to burp
quite consistently with the monitor. It dims, flickers, and even flashes
off. Best medicine - a solid little thump and everything clears up.
  Now thinking as an engineer, I hope there is a better solution. Has
anybody had any similar problems? Being a student programmer, I am hoping
for an easier (on the pocket) road then my last bout with DEC.
  Any help will be appreciated.

                   Bill
*---------------------------------------------*---------------------------*
| William S. Kirchhoff -                      |        \   /\             |
|   North East Regional Data Center (NERDC)   |       --)(--  \           |
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| $$$i$jv@nervm.BITNET  wsk@beach.cis.ufl.EDU |      /____________\       |
|         crostyme@pine.circa.ufl.EDU         |     "Touch Tomorrow"      |
*---------------------------------------------*   University of Florida   |
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*---------------------------------------------*---------------------------*

Re: Flickering Rainbow.

#1252

Author: campbell
Date: Fri, 04 Dec 1987 02:50

27 lines
2062 bytes

In article <8712030220.AA03580@ucbvax.Berkeley.EDU> $$$I$JV@NERVM.BITNET writes:
<>
<>            ... My system over the last few months has started to burp
<>quite consistently with the monitor. It dims, flickers, and even flashes
<>off. Best medicine - a solid little thump and everything clears up.

Take heed and beware!  I have observed this problem in several Rainbows,
and every time it has turned out that the power cable -- the hefty ribbon
cable that connects the power supply to the motherboard -- was toasting
itself.

Shut off your Rainbow and remove the power cable.  Inspect it carefully.
You're likely to find one or more of the contacts in the cable ends
darkened or scorched.  If you do, leave your Rainbow powered off, and get
a replacement cable immediately.  Do not delay -- I lost the contents of
my winchester once because of this problem.

I now buy two replacement cables every time this happens, just to make sure
I have a spare on hand.  They're pretty cheap.  And I inspect the power cables
on my Rainbows regularly -- every couple of months -- to be sure I catch
a bad cable before it catches me.

A word to the wise...
-- 
Larry Campbell                                The Boston Software Works, Inc.
Internet: campbell@maynard.bsw.com          120 Fulton Street, Boston MA 02109
uucp: {husc6,mirror,think}!maynard!campbell         +1 617 367 6846

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