Date   : Sun, 06 Feb 2005 16:50:52 +0800
From   : "Tom Drage" <drage@...>
Subject: Re: bbc lockups

 Very strange, it turned out a case of unplug the disk drive and it works
fine....






     www.draget.net 


-----Original Message-----
From: Majordomo List Manager [mailto:majordomo@...] On Behalf Of
W.Scholten
Sent: Saturday, February 05, 2005 3:49 PM
To: bbc-micro@...
Subject: Re: [BBC-Micro] bbc lockups

Pete Turnbull wrote:

> Someone suggested using contact cleaner.  Don't.  It's for switches,
> not socketed chips.  It will make matters worse in the long run.

No. There are various sorts of contact cleaner.

E.g. here in NL (but should be available all over europe) we have:
 Kontakt 60: Eliminates oxide and sulfide layers, and leaves a
protection layer to keep contacts from oxidizing again. Mainly for
switches, relais, but works fine for IC sockets if using *very little*.
Problem here is that when using too much, an oily substance (surplus of
the 'protection layer') will spread over the board. After spraying it's
best to clean the non-metal areas (esp. the PCB) 

 Kontakt 61: As 60 but with lubricant for moving parts.

 Tuner 600: Cleanes and leaves no residue and is used for all delicate
equipment, including Hifi potentionmeters, switches, remote control
keypads, computer equipment. Excellent for ICs and sockets.

I use tuner 600 for ICs/sockets except where I change ICs a lot, then I
use Kontakt 60. Thie latter is also perfect for e.g. the BBC keyboard
cable/contacts if one fiddles with ROMs (moving the keyboard etc.)


Wouter
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