10 May
2021
10 May
'21
3:06 p.m.
Anyone have any idea on how to open this particular Apple II PSU? It is
a Astec AA 11040B and has like a rivet on each side in the middle. All
the other supplies I've messed with just had screws along the bottom.
Trying to remove the bottom of the casing so I can work on the supply
itself. Link to a pic of it.
Thanks for any help.
http://www.trailingedge.com/images/A2PSU.jpg
David Williams
www.trailingedge.com
10 May
10 May
3:26 p.m.
In a search on eBay for that Astec p/n seems the power supplies made in Hong Kong have the
two rivets you shared in the image.
Those manufactured in Malaysia have screws all around.
Seems to be an tampering deterrent and or warranty void indicator to me. If they are
aluminum pop rivets, they should drill out easily.
Don Resor
Sent from someone's iPhone
On May 10, 2021, at 3:07 PM, David Williams via cctalk
<cctalk at classiccmp.org> wrote:
?Anyone have any idea on how to open this particular Apple II PSU? It is a Astec AA
11040B and has like a rivet on each side in the middle. All the other supplies I've
messed with just had screws along the bottom. Trying to remove the bottom of the casing so
I can work on the supply itself. Link to a pic of it.
Thanks for any help.
http://www.trailingedge.com/images/A2PSU.jpg
David Williams
www.trailingedge.com
3:31 p.m.
Just me that reaches for a 2mm drill then? I realise people may react in horror at this,
but your chances of getting swarf in the PSU are slim to negative. Oh and while you?re in
there, please remove the 0.47uF RIFA before it explodes, assuming it hasn?t already of
course in which case it?d be best to clean up the mess it left when it did.
--
Adrian Graham
Owner of Binary Dinosaurs, the UK's biggest private home computer collection?
t: @binarydinosaurs f: facebook.com/binarydinosaurs
w: www.binarydinosaurs.co.uk
On 10 May 2021, at 23:06, David Williams via cctalk
<cctalk at classiccmp.org> wrote:
Anyone have any idea on how to open this particular Apple II PSU? It is a Astec AA 11040B
and has like a rivet on each side in the middle. All the other supplies I've messed
with just had screws along the bottom. Trying to remove the bottom of the casing so I can
work on the supply itself. Link to a pic of it.
Thanks for any help.
http://www.trailingedge.com/images/A2PSU.jpg
David Williams
www.trailingedge.com
4:17 p.m.
On 2021-05-10 17:31, Adrian Graham via cctalk wrote:
Just me that reaches for a 2mm drill then? I realise
people may react
in horror at this, but your chances of getting swarf in the PSU are
slim to negative. Oh and while you?re in there, please remove the
0.47uF RIFA before it explodes, assuming it hasn?t already of course
in which case it?d be best to clean up the mess it left when it did.
Well given I've never had to drill anything out before, the idea hadn't
occurred to me. As far as replacing anything inside, this unit is
completely dead and I suspect a good bit of it will have to be replaced.
Just need to get inside first.
David Williams
www.trailingedge.com
4:18 p.m.
On Mon, 10 May 2021, Adrian Graham via cctalk wrote:
Just me that reaches for a 2mm drill then? I realise
people may react in
horror at this, but your chances of getting swarf in the PSU are slim to
negative. Oh and while you?re in there, please remove the 0.47uF RIFA
before it explodes, assuming it hasn?t already of course in which case
it?d be best to clean up the mess it left when it did.
This area is so backward, that metric drill bits are considered esoteric!
1/8" works OK, and will chuck in a Dremel.
If it were a damaged screw, rather than a rivet, I would use a left-handed
drill bit.
--
Grumpy Ol' Fred cisin at xenosoft.com
5:34 p.m.
On 2021-05-10 18:18, Fred Cisin via cctalk wrote:
This area is so backward, that metric drill bits are
considered
esoteric!
1/8" works OK, and will chuck in a Dremel.
If it were a damaged screw, rather than a rivet, I would use a
left-handed drill bit.
Which is pretty much what I ended up with. Surprised that this unit
looks in such good shape inside, I expected to see it already exploded.
Well time to get to work on it now and see if I can't get a working unit
out of it.
David Williams
www.trailingedge.com
11 May
11 May
7:59 a.m.
The rivets are likely more of a safety thing than an issue warrantee repair thing. The
inside of a Apple II is intended to have user access. The switching supply has 300 to 400V
DC inside. Definitely a potential lethal hazard.
I hate those filter caps. I had one go at the last Maker Faire ( no more ? ). I was trying
out the Oregon trail when the nasty smoke started pouring out. Luckily we had a drill
handy to remove the rivets.
Dwight
________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of David Williams via
cctalk <cctalk at classiccmp.org>
Sent: Monday, May 10, 2021 5:34 PM
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
Subject: Re: Apple II PSU
On 2021-05-10 18:18, Fred Cisin via cctalk wrote:
This area is so backward, that metric drill bits are
considered
esoteric!
1/8" works OK, and will chuck in a Dremel.
If it were a damaged screw, rather than a rivet, I would use a
left-handed drill bit.
Which is pretty much what I ended up with. Surprised that this unit
looks in such good shape inside, I expected to see it already exploded.
Well time to get to work on it now and see if I can't get a working unit
out of it.
David Williams
www.trailingedge.com<http://www.trailingedge.com>
10:44 p.m.
Dwight.
That smells like one of the Rifa caps. Thick brown smoke.
Or was it one of the big electros?
On Wed, 12 May 2021, 12:59 am dwight via cctalk, <cctalk at classiccmp.org>
wrote:
The rivets are likely more of a safety thing than an
issue warrantee
repair thing. The inside of a Apple II is intended to have user access. The
switching supply has 300 to 400V DC inside. Definitely a potential lethal
hazard.
I hate those filter caps. I had one go at the last Maker Faire ( no more
? ). I was trying out the Oregon trail when the nasty smoke started
pouring out. Luckily we had a drill handy to remove the rivets.
Dwight
________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of David Williams
via cctalk <cctalk at classiccmp.org>
Sent: Monday, May 10, 2021 5:34 PM
To: General Discussion: On-Topic and Off-Topic Posts <
cctalk at classiccmp.org>
Subject: Re: Apple II PSU
On 2021-05-10 18:18, Fred Cisin via cctalk wrote:
This area is so backward, that metric drill bits
are considered
esoteric!
1/8" works OK, and will chuck in a Dremel.
If it were a damaged screw, rather than a rivet, I would use a
left-handed drill bit.
Which is pretty much what I ended up with. Surprised that this unit
looks in such good shape inside, I expected to see it already exploded.
Well time to get to work on it now and see if I can't get a working unit
out of it.
David Williams
www.trailingedge.com<http://www.trailingedge.com>
1321
days inactive
1323
days old
8 comments
7 participants
participants (7)
-
binarydinosaurs＠gmail.com -
cisin＠xenosoft.com -
dkelvey＠hotmail.com -
doug＠doughq.com -
nospam212-cctalk＠yahoo.com -
organlists1＠sonic.net -
pete＠dunnington.plus.com