3 Jan
2008
3 Jan
'08
4:04 p.m.
--- "Roy J. Tellason" <rtellason at verizon.net> wrote:
On Thursday 03 January 2008 00:48, Gene Buckle
wrote:
DC-DC converter on the
Yeah, like maybe a shorted 1488 :)
See what else uses -12v, and work from there. For what
it's worth, I've replaced quite a few 1488/1489's -
they typically get zapped in terminals when people do
stupid things with the serial lines while the terminal
is plugged in. I don't know if a failed one can short
out the -12v rail though. Never seen it happen
specifically, but that doesn't mean it can't.
-Ian
> I didn't check for -12V. I'll do
that before I
go to the effort of
pulling
the chip and replacing it.
Checked it. -0.60v There's a Elpac/TDC CB-3811 board that may have died. I'll pull the
board
tomorrow and test right at
the legs of the device. Thanks for questioning
whether or not I'd checked
the -12v supply!
Finding a replacement is gonna be a stone b*tch I
think. :(
I may have to go to another DC-DC converter that
is near the same size
that I can wire in.
Something might be loading it down, too. I'd check
for that before assuming
it's bad.