30 May
2010
30 May
'10
11:34 a.m.
There are only a few resistors on the board and
nothing that looks like a
pico fuse. The supply comes from the A500 and I can find it on one of the
OK. Do they have labels like 'R1'. 'R2', etc. If so, just check there
isn't an 'F1' amongst them (it caught me once...). And just to be sure,
cehck the votlage on each end of each ressitor (board plugged in, machine
powered up, of course), just in case one _is_ a fuse in series with the
5V line. If you find 5V on one ened of one component, you have a place to
start looking...
pins that is the memory expansion connector on the
scsi board, but it
doesn't appear to go farther than that.
Can you explain the set-up, please. What is connected to what, and where
the PSU is connected to (the A500 mainboard, right)?
If you plug in this expanison board that you can't find 5V on, does the
Amiga still work, or at least, can you still find 5V on the chips on the
Amiga (and any other expanins devices) _with this board connected. I am
wondering if this board is shorting out the 5V line, rather than it
simplky not being connected.
With the expansion board removed, check the resistance between a 5V pin
and ground on one of the chips,. The value is meaningless, it'll depeend
on the mryer, but if it's very loq, I would suspect a short. Now check
the resistance brtween the 5V pin on the connector and the ground on that
board. Is it infinite, indicating an open-circuit somewhere?
It's not something silly like a dry joint on
the connector, or a broekn
contact, is it?
That's just it, I haven't seen anything. That's why it's making
me nuts.
:)