11/45 revisited

Jay West jwest at classiccmp.org
Fri Mar 9 18:19:15 CST 2007


I was looking at the power control board for the H742A (5409730) that is 
supposed to be putting out my +15v. I couldn't find any schematics on this 
board but the system engineering prints appear to indicate they should be 
present. In the absence of schematics (and any obvious scorching) I figured 
the likely first thing to check is the sole TO-3 power transistor on the 
board. Sure enough, the C-E junction is shorted so at the least I'll need 
one of those.

1) The critter is Motorola "DEC3000" which I'm betting is a DEC house part 
number (since ECG xref shows nothing && it starts with DEC). Can anyone clue 
me in to what part that really is?

2) Are the schematics for 5409730 around so I can try to understand it a 
little better?

Thanks for any pointers!

Jay West





More information about the cctech mailing list