Apple /// Power Supply - test-drb@ccmp.vtda.org

1 Jun 2007

On 31 May, 2007, at 17:22, cctalk-request at classiccmp.org wrote:

...
  Date: Thu, 31 May 2007 06:00:46 -0500
 From: Jules Richardson <julesrichardsonuk at yahoo.co.uk>
 Subject:
 To: General Discussion: On-Topic and Off-Topic Posts
 	<cctalk at classiccmp.org>
 Message-ID: <465EAADE.6030809 at yahoo.co.uk>
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 I would hope that somebody here could look inside their machine  
 and tell
 you the markings on the capacitor if the original one is so badly  
 damaged
 as to be unreadable. 
 If it was the mains suppression cap then I believe it's a standard  
 X2 class
 250V part* in the UK (but then presumably a different part gets  
 used here in
 the US version)

 * I think they only sell X2's rated for 275V these days. Farnell  
 and RS do
 them I belive, but I'm not sure that Maplin do any more.

 I might haul mine back home tomorrow (it's at Bletchley, but as we  
 now have an
 A/// there it doesn't need to stay) in which case I can take a look  
 - I need
 to replace that cap in mine anyway. 
There may be a difference between US and European power supplies.  My  
spare one is in its original box, marked AP III Euro, EM WR SUP,  
669-9050. The PCB is marked ASTEC AA11190 and the back panel is  
marked 220VAC 50-60Hz, so NOT 110 volt compatible. If it is one of  
the four black upright ones at the rear of the PCB, they are all  
marked 250v 100microFarad +105 degrees C. There is also a rectangular  
yellow one marked 0.22 microFarad at X 250v~MP whatever that means.  
There's another 20 capacitors on the board, so if yours is a european  
one and its one of the other 20 capacitors, you had better let me  
know which one.

Roger Holmes
Technical Director, Microspot Ltd. Developers of 2D and 3D graphic  
software for the Apple Macintosh.