Most of the old equipment has power supply switch problem. The contacts arc
by electric power and need to be replaced or sand down to refinish the
surfaces to prevent resistance build up. After the resurfacing surface, is
there any chemical can prevent the arc again and the oxidation coming back?
I am using the de-ox cleaner now, any other suggestions.

Thanks

Eric

One more thing I would like to mention, those power switches are coming from
audio equipment such as amplifier, CD player.

Thanks

Eric

"Eric" wrote in message
...
Most of the old equipment has power supply switch problem. The contacts
arc
by electric power and need to be replaced or sand down to refinish the
surfaces to prevent resistance build up. After the resurfacing surface,
is
there any chemical can prevent the arc again and the oxidation coming
back?
I am using the de-ox cleaner now, any other suggestions.

Thanks

Eric

One more thing I would like to mention, those power switches are coming from
audio equipment such as amplifier, CD player.

Thanks

Eric

"Eric" wrote in message
...
Most of the old equipment has power supply switch problem. The contacts
arc
by electric power and need to be replaced or sand down to refinish the
surfaces to prevent resistance build up. After the resurfacing surface,
is
there any chemical can prevent the arc again and the oxidation coming
back?
I am using the de-ox cleaner now, any other suggestions.

Thanks

Eric

Caig Labs DeoxIt product is excellent for oxidized switch contacts. I don't
use abrasives on any contacts (motor or relay contacts, or electronics
switches) because it degrades the surfaces.
I typically use a heavy paper such as file folder strips wetted with DeoxIt
to clean contacts.
Where the contacts are slightly rough or badly oxidized (or dirty) I'll use
the end grain of a hardwood swab stick or a pop-cicle stick cut with a long
tapered bevel.

Badly pitted contacts require replacement, particularly where they carry
larger currents in power applications. I don't put much trust in sandpapered
contacts, as they're reliability is questionable, likely to fail in ways
that could cause other problems.

Cheers
WB
..................

"Eric" wrote in message
...
Most of the old equipment has power supply switch problem. The contacts
arc
by electric power and need to be replaced or sand down to refinish the
surfaces to prevent resistance build up. After the resurfacing surface,
is
there any chemical can prevent the arc again and the oxidation coming
back?
I am using the de-ox cleaner now, any other suggestions.

Thanks

Eric

On Mon, 13 Sep 2004 15:24:30 -0400, "Wild Bill"
wrote:


Caig Labs DeoxIt product is excellent for oxidized switch contacts. I don't
use abrasives on any contacts (motor or relay contacts, or electronics
switches) because it degrades the surfaces.
I typically use a heavy paper such as file folder strips wetted with DeoxIt
to clean contacts.
Where the contacts are slightly rough or badly oxidized (or dirty) I'll use
the end grain of a hardwood swab stick or a pop-cicle stick cut with a long
tapered bevel.

Badly pitted contacts require replacement, particularly where they carry
larger currents in power applications. I don't put much trust in sandpapered
contacts, as they're reliability is questionable, likely to fail in ways
that could cause other problems.

Cheers
WB
.......

Yes, excellent advice.

I don't know what the legal position is in other countries, but over
here you'd come un-stuck...

Power switches are classified as Safety Items and must always be
replaced by the correct item and never repaired. If - as does actually
happen, surprisingly often - the switch failed again and went on fire,
there would be legal and insurance implications. In the event of a fire
in apparatus I'd repaired for someone else, I'd be liable automatically,
whether it was a chargeable job or not; and in the case of equipment of
my own, it would open a large loophole in my insurance if the company
got wind of it.

I still keep my basic Public Liability Insurance up to date, just in
case...

TTFN



--
ajb

On Mon, 13 Sep 2004 15:24:30 -0400, "Wild Bill"
wrote:


Caig Labs DeoxIt product is excellent for oxidized switch contacts. I don't
use abrasives on any contacts (motor or relay contacts, or electronics
switches) because it degrades the surfaces.
I typically use a heavy paper such as file folder strips wetted with DeoxIt
to clean contacts.
Where the contacts are slightly rough or badly oxidized (or dirty) I'll use
the end grain of a hardwood swab stick or a pop-cicle stick cut with a long
tapered bevel.

Badly pitted contacts require replacement, particularly where they carry
larger currents in power applications. I don't put much trust in sandpapered
contacts, as they're reliability is questionable, likely to fail in ways
that could cause other problems.

Cheers
WB
.......

Yes, excellent advice.

I don't know what the legal position is in other countries, but over
here you'd come un-stuck...

Power switches are classified as Safety Items and must always be
replaced by the correct item and never repaired. If - as does actually
happen, surprisingly often - the switch failed again and went on fire,
there would be legal and insurance implications. In the event of a fire
in apparatus I'd repaired for someone else, I'd be liable automatically,
whether it was a chargeable job or not; and in the case of equipment of
my own, it would open a large loophole in my insurance if the company
got wind of it.

I still keep my basic Public Liability Insurance up to date, just in
case...

TTFN



--
ajb

Caig Labs DeoxIt product is excellent for oxidized switch contacts. I don't
use abrasives on any contacts (motor or relay contacts, or electronics
switches) because it degrades the surfaces.
I typically use a heavy paper such as file folder strips wetted with DeoxIt
to clean contacts.
Where the contacts are slightly rough or badly oxidized (or dirty) I'll use
the end grain of a hardwood swab stick or a pop-cicle stick cut with a long
tapered bevel.

Badly pitted contacts require replacement, particularly where they carry
larger currents in power applications. I don't put much trust in sandpapered
contacts, as they're reliability is questionable, likely to fail in ways
that could cause other problems.

Cheers
WB
..................

"Eric" wrote in message
...
Most of the old equipment has power supply switch problem. The contacts
arc
by electric power and need to be replaced or sand down to refinish the
surfaces to prevent resistance build up. After the resurfacing surface,
is
there any chemical can prevent the arc again and the oxidation coming
back?
I am using the de-ox cleaner now, any other suggestions.

Thanks

Eric