5 Feb
2004
5 Feb
'04
12:25 a.m.
I had a spare moment yesterday so I decided to try and troubleshoot my
bad M7891-DC (128kw) in an 11/34a.
Looks like I have no +12v. The 12v regulator seems to be working as I
have 12v up the 2A fuse. But nothing after that.
I'm assuming the fuse has blown. Easy to replace, but I also suspect it
blew for a reason. (and replacing it might just yield another blown fuse
:-)
Anyone seen this before? Do they sometimes blow due to transients?
I'm tempted to apply 12v after the fuse with a bench supply that has a
current regulator and see what it draws. It's been a while since I
worked with "plain old DRAMs" but I assume the 12v is for them (Vdd).
-brad