Date   : Wed, 19 Aug 2009 05:49:25 +0100
From   : mike@... (Mike Tomlinson)
Subject: Power supply +5V problem revisited

In article <Pine.WNT.4.64.0908171641190.4080@...>, Anders Carlsson
<anders.carlsson@...> writes

>Today I had some spare time to look into one of my two BBC B's, the one
>with a broken power supply. Based on previous observations and advice,
>the Q2 BU208A transistor was to suspect: power supply silent, no smoke,
>reads 5V unloaded but only 0.8V with load.
>
>I replaced the case transistor and mounted it back together. Now the
>cassette + caps LEDs slowly light up, but nothing else happens 

Replace C9, 220uF 35V, next to the BU208A you have just replaced.  Use a
good quality 105 degree C replacement.

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