28 Jan
2011
28 Jan
'11
11:53 a.m.
On 27/01/2011 22:34, "Jules Richardson" <jules.richardson99 at gmail.com>
wrote:
Looking at photos of my system (physical hardware is
in storage), it has 6
boards:
32K CPU/ROM/RAM,
FDC/serial,
32K RAM,
VDU #1 (keyboard, modulator, composite out, 1KB RAM),
VDU #2 (composite out, 16KB RAM, 26-way header)
Bus terminator
Obviously the order isn't that important. Mine is (R to L):
32K cpu/rom/ram
VDU #1
32K RAM
VDU #2
FDC/serial
Colour PAL board - modulator goes to TV out and composite plugs into this
too instead of VDU #1
... plus an "RGB board" mounted on the back
panel, which has RGBS BNC outputs
and hooks to the 26-way header on VDU #2. VDU #1 and VDU #2 are connected
together via 16-way DIL headers on the boards.
I don't have that.
>> I should be able to get a Megger at work. The
reason I mention the
>> caps is because the last 3 or 4 machines I've had in have all blown
>> the mains filters.
>
> Right.. Those are not the capacitors that most people replace without
> testing on old machines...
And this machine doesn't have them anyway, it's a brick transformer.
I seem to recall a small tantalum capacitor somewhere
in the PSUs of one of
the 380Zs that I've had letting go after a short while of use after being in
storage - big bang and a lot of smoke. That's the only time I've had that
happen to me, but it was a bit unnerving at the time :-)
There's a few tantalum caps in there. I had one blow on me in my Sharp
MZ80K, THAT was a fright :)
Yes... and if there's a chance of damp, it's
probably worth stripping the
whole system and checking for corroded connectors, IC legs etc. and then
testing the PSU under a dummy load anyway.
Done all that, the boards are in great condition as is the PSU internals.
Problem is the glass fuse has blown and I don't have a spare at home, bah.
It needs 250V/1A and all I have easy access to are PETs which are 250V/.75A.
Hey ho, I'll get some at work on Monday :)
--
Adrian/Witchy
Binary Dinosaurs creator/curator
Www.binarydinosaurs.co.uk - the UK's biggest private home computer
collection?