30 May
2010
30 May
'10
6:14 p.m.
On Sat, 29 May 2010, Tony Duell wrote:
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
pins that is the memory expansion connector on the scsi board, but it
doesn't appear to go farther than that.
I've
tested the Vcc pins on all the chips that are on the board and none
show +5. The A500 works without issue so I know the power supply is ok.
I can find +5 on the .100 dual pin header that the memory expander plugs
in to, but no where else. +12V does show up on the molex power connector
for the drive.
I've also checked both sides of what look like tantalum caps and I get no
power there either. I can't see any visible damage to the board, no cut
or scratched traces, etc. I'm at a total loss as to why it's not getting
any power.
Is there anythign on the PCB that could be a picofuse (may look like a
resistor, just to confuse you!). That's the only thing I'd expect ot
possibly be in series with a 5V supply to an expansiopn board.
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.
:)
g.
--
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