16 Jul
2012
16 Jul
'12
11:57 a.m.
I picked up an 11/04 this weekend, thanks to the generosity of another list
member. It has a known faulty PSU, although I don't yet know if it produces
any output at all or not. Any tips on common failures?
IIRC the 11/04 can be (officially) fitted in several different
mounting boxes.. I have experience of2 o them
The 5.25" one uses an H777 PSU to the right of the backplane. This is a
somewhat evil SMPSU at least if you don't fully understand the scheamtic.
The 10.5" one Has the PSU o nthe back. It has a large mains transformer
in the middle feed DEC power bricks (low-votlage swtiching regualtors)
for the 5V and -15V outputs. The +15V supply is a simple linear regulator
on a PCB under the transforrmer. This one is relatively easy to sort out.
I cant' thin kof any common failures for either one, but let us know what
you have and I'll think of things to check.
-tony