In article . net,
"Ralph Mowery" wrote:

Check to see if any or all of the pass transistors are shorted.

Bzzzt, wrong, would you like to try for what is behind Door #3?

If the Pass Transistors were shorted, you would see the voltage of the
filter capacitors and rectifiers on the output. He stated that he had
"No or little output voltage". This would indicate that the Pass
Transistors are OPEN, blown that way by the High Current when the output
was shorted, or the rectifiers are blown OPEN and not producing any
DC to the filter caps.


Me

In article ,
Me wrote:

Check to see if any or all of the pass transistors are shorted.

Bzzzt, wrong, would you like to try for what is behind Door #3?

If the Pass Transistors were shorted, you would see the voltage of the
filter capacitors and rectifiers on the output. He stated that he had
"No or little output voltage". This would indicate that the Pass
Transistors are OPEN, blown that way by the High Current when the output
was shorted, or the rectifiers are blown OPEN and not producing any
DC to the filter caps.

It's still darned good advice. If there's a fuse or fusible component
between the DC filter caps and the pass transistor, it might very well
have blown if the pass transistor shorted during an overload.

From what I've heard, bipolar power transistors are as likely to fail
shorted as they are to fail open.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

Check to see if any or all of the pass transistors are shorted.

Bzzzt, wrong, would you like to try for what is behind Door #3?

If the Pass Transistors were shorted, you would see the voltage of the
filter capacitors and rectifiers on the output. He stated that he had
"No or little output voltage". This would indicate that the Pass
Transistors are OPEN, blown that way by the High Current when the output
was shorted, or the rectifiers are blown OPEN and not producing any
DC to the filter caps.


I don't debate or try very hard to teach idiots but the Astrons have a
crowbar circuit that will activate and the output voltage will drop to a
very low value. Most simiconductors fail by shorting and are not blown
open.

In article . net,
"Ralph Mowery" wrote:

I don't debate or try very hard to teach idiots but the Astrons have a
crowbar circuit that will activate and the output voltage will drop to a
very low value. Most simiconductors fail by shorting and are not blown
open.

Bzzzt, Wrong again, If the Crowbar SCR is shorted or in the conducting
state, then the whole output of the powersupply would be dissipated by
it, and that would then cause the Pass transistors to fail from
overcurrent, or the input AC fuse to fail from overcurrent. He stated
in the original post, that the AC fuse was GOOD, but he was getting no
output voltage on the DC terminals, therefore there would be an OPEN
somewhere in the supply that was caused by the OVER CURRENT of touching
the DC Terminals together.

Your analysis skills are a bit lacking here dude.


Me

In article . net,
"Ralph Mowery" wrote:

I don't debate or try very hard to teach idiots but the Astrons have a
crowbar circuit that will activate and the output voltage will drop to a
very low value. Most simiconductors fail by shorting and are not blown
open.

Bzzzt, Wrong again, If the Crowbar SCR is shorted or in the conducting
state, then the whole output of the powersupply would be dissipated by
it, and that would then cause the Pass transistors to fail from
overcurrent, or the input AC fuse to fail from overcurrent. He stated
in the original post, that the AC fuse was GOOD, but he was getting no
output voltage on the DC terminals, therefore there would be an OPEN
somewhere in the supply that was caused by the OVER CURRENT of touching
the DC Terminals together.

Your analysis skills are a bit lacking here dude.


Me

In article . net,
"Ralph Mowery" wrote:

I don't debate or try very hard to teach idiots but the Astrons have a
crowbar circuit that will activate and the output voltage will drop to a
very low value. Most simiconductors fail by shorting and are not blown
open.

Bzzzt, Wrong again, If the Crowbar SCR is shorted or in the conducting
state, then the whole output of the powersupply would be dissipated by
it, and that would then cause the Pass transistors to fail from
overcurrent, or the input AC fuse to fail from overcurrent. He stated
in the original post, that the AC fuse was GOOD, but he was getting no
output voltage on the DC terminals, therefore there would be an OPEN
somewhere in the supply that was caused by the OVER CURRENT of touching
the DC Terminals together.

Your analysis skills are a bit lacking here dude.


Me

In article ,
Me wrote:

Check to see if any or all of the pass transistors are shorted.

Bzzzt, wrong, would you like to try for what is behind Door #3?

If the Pass Transistors were shorted, you would see the voltage of the
filter capacitors and rectifiers on the output. He stated that he had
"No or little output voltage". This would indicate that the Pass
Transistors are OPEN, blown that way by the High Current when the output
was shorted, or the rectifiers are blown OPEN and not producing any
DC to the filter caps.

It's still darned good advice. If there's a fuse or fusible component
between the DC filter caps and the pass transistor, it might very well
have blown if the pass transistor shorted during an overload.

From what I've heard, bipolar power transistors are as likely to fail
shorted as they are to fail open.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

In article ,
Me wrote:

Check to see if any or all of the pass transistors are shorted.

Bzzzt, wrong, would you like to try for what is behind Door #3?

If the Pass Transistors were shorted, you would see the voltage of the
filter capacitors and rectifiers on the output. He stated that he had
"No or little output voltage". This would indicate that the Pass
Transistors are OPEN, blown that way by the High Current when the output
was shorted, or the rectifiers are blown OPEN and not producing any
DC to the filter caps.

It's still darned good advice. If there's a fuse or fusible component
between the DC filter caps and the pass transistor, it might very well
have blown if the pass transistor shorted during an overload.

From what I've heard, bipolar power transistors are as likely to fail
shorted as they are to fail open.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

Check to see if any or all of the pass transistors are shorted.

Bzzzt, wrong, would you like to try for what is behind Door #3?

If the Pass Transistors were shorted, you would see the voltage of the
filter capacitors and rectifiers on the output. He stated that he had
"No or little output voltage". This would indicate that the Pass
Transistors are OPEN, blown that way by the High Current when the output
was shorted, or the rectifiers are blown OPEN and not producing any
DC to the filter caps.


I don't debate or try very hard to teach idiots but the Astrons have a
crowbar circuit that will activate and the output voltage will drop to a
very low value. Most simiconductors fail by shorting and are not blown
open.

Check to see if any or all of the pass transistors are shorted.

Bzzzt, wrong, would you like to try for what is behind Door #3?

If the Pass Transistors were shorted, you would see the voltage of the
filter capacitors and rectifiers on the output. He stated that he had
"No or little output voltage". This would indicate that the Pass
Transistors are OPEN, blown that way by the High Current when the output
was shorted, or the rectifiers are blown OPEN and not producing any
DC to the filter caps.


I don't debate or try very hard to teach idiots but the Astrons have a
crowbar circuit that will activate and the output voltage will drop to a
very low value. Most simiconductors fail by shorting and are not blown
open.