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aeroflash strobe repair

 
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yellowduckduo(at)gmail.co
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PostPosted: Sat Jul 21, 2018 7:27 pm    Post subject: aeroflash strobe repair Reply with quote

I just had another aeroflash 151-0011 strobe power supply fail.
Interestingly it was the second one I've seen with an open 330K resistor
that was preventing triggering.
On 12 volts the unit would almost immediately charge up to 400 volts and
then shutdown until the voltage decayed.
On about 6 volts the unit would charge continuously to about 300 volts
and you could hear the trigger fire but the signal was not getting to
the white wire going to the flash tube.
Across the 330K resistor measured about 450K in circuit and it was in
fact open. It was the larger (1/2 watt) of the two 330K resistors that
failed.
Simple fix but of course the usual safety cautions of respecting high
voltage and capacitors applies. Mine self discharged quickly but yours
might not.
Ken


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PostPosted: Sun Jul 22, 2018 8:27 am    Post subject: aeroflash strobe repair Reply with quote

At 10:26 PM 7/21/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: C&K <yellowduckduo(at)gmail.com>

I just had another aeroflash 151-0011 strobe power supply fail.
Interestingly it was the second one I've seen with an open 330K resistor that was preventing triggering.
On 12 volts the unit would almost immediately charge up to 400 volts and then shutdown until the voltage decayed.
On about 6 volts the unit would charge continuously to about 300 volts and you could hear the trigger fire but the signal was not getting to the white wire going to the flash tube.
Across the 330K resistor measured about 450K in circuit and it was in fact open. It was the larger (1/2 watt) of the two 330K resistors that failed.
Simple fix but of course the usual safety cautions of respecting high voltage and capacitors applies. Mine self discharged quickly but yours might not.

Good find. Thanks for sharing. I am mystified by
the failure of so high value of resistor. Was
it observably discolored or mechanically compromised?
1/2w was perhaps marginal. 300v/300k is one mil which
is 300 milliwatts. Was it a carbon comp?



Bob . . .


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yellowduckduo(at)gmail.co
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PostPosted: Sun Jul 22, 2018 10:49 am    Post subject: aeroflash strobe repair Reply with quote

It looked like a modern metal film resistor to me. Mounted parallel with
the circuit board with a light conformal coating. No evidence of it
getting hot, discolored, or mechanically stressed. In fact there was no
evidence of anything on the circuit board running hot. This unit was 12
years old and bolted to the main spar in the outboard wing bay. The
other failed unit was about 8 years old at the time and has continued
working OK since the repair. Both units were almost certainly from the
same production run.
Ken

On 22/07/2018 12:26 PM, Robert L. Nuckolls, III wrote:
Quote:
At 10:26 PM 7/21/2018, you wrote:
>
>
> I just had another aeroflash 151-0011 strobe power supply fail.
> Interestingly it was the second one I've seen with an open 330K
> resistor that was preventing triggering.
> On 12 volts the unit would almost immediately charge up to 400 volts
> and then shutdown until the voltage decayed.
> On about 6 volts the unit would charge continuously to about 300
> volts and you could hear the trigger fire but the signal was not
> getting to the white wire going to the flash tube.
> Across the 330K resistor measured about 450K in circuit and it was in
> fact open. It was the larger (1/2 watt) of the two 330K resistors
> that failed.
> Simple fix but of course the usual safety cautions of respecting high
> voltage and capacitors applies. Mine self discharged quickly but
> yours might not.

Good find. Thanks for sharing. I am mystified by
the failure of so high value of resistor. Was
it observably discolored or mechanically compromised?
1/2w was perhaps marginal. 300v/300k is one mil which
is 300 milliwatts. Was it a carbon comp?
Bob . . .



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nuckolls.bob(at)aeroelect
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PostPosted: Mon Jul 23, 2018 7:20 am    Post subject: aeroflash strobe repair Reply with quote

At 01:39 PM 7/22/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: C&K <yellowduckduo(at)gmail.com>

It looked like a modern metal film resistor to me. Mounted parallel with the circuit board with a light conformal coating. No evidence of it getting hot, discolored, or mechanically stressed. In fact there was no evidence of anything on the circuit board running hot. This unit was 12 years old and bolted to the main spar in the outboard wing bay. The other failed unit was about 8 years old at the time and has continued working OK since the repair. Both units were almost certainly from the same production run.

Interesting! By the way, do you happend to
have a schematic and/or maintenance manual
on the device?



Bob . . .


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PostPosted: Mon Jul 23, 2018 7:57 am    Post subject: aeroflash strobe repair Reply with quote

No I could not find any documentation.
Ken

On 23/07/2018 11:19 AM, Robert L. Nuckolls, III wrote:
Quote:
At 01:39 PM 7/22/2018, you wrote:
>
>
> It looked like a modern metal film resistor to me. Mounted parallel
> with the circuit board with a light conformal coating. No evidence of
> it getting hot, discolored, or mechanically stressed. In fact there
> was no evidence of anything on the circuit board running hot. This
> unit was 12 years old and bolted to the main spar in the outboard
> wing bay. The other failed unit was about 8 years old at the time and
> has continued working OK since the repair. Both units were almost
> certainly from the same production run.

Interesting! By the way, do you happend to
have a schematic and/or maintenance manual
on the device?
Bob . . .



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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 720

PostPosted: Mon Jul 23, 2018 8:18 am    Post subject: aeroflash strobe repair Reply with quote

And to make things even more difficult;  The circuit board is conformally coated - NOT IN CLEAR!  A rusty brown.  Getting below the coating to read the component and values becomes a surgeon's job.
Barry
On Mon, Jul 23, 2018 at 11:19 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
At 01:39 PM 7/22/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: C&K <yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com)>

It looked like a modern metal film resistor to me. Mounted parallel with the circuit board with a light conformal coating. No evidence of it getting hot, discolored, or mechanically stressed. In fact there was no evidence of anything on the circuit board running hot. This unit was 12 years old and bolted to the main spar in the outboard wing bay. The other failed unit was about 8 years old at the time and has continued working OK since the repair. Both units were almost certainly from the same production run.

  Interesting!  By the way, do you happend to
  have a schematic and/or maintenance manual
  on the device?



  Bob . . .


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PostPosted: Mon Jul 23, 2018 9:02 am    Post subject: aeroflash strobe repair Reply with quote

Mine just had an amber colored coating that I could see through.
If it helps anyone there are 3 resistors mounted in a row perpendicular
to the edge of the board near where the 3 wires connect that go to the
flash tube.
The middle resistor was the problem one.
Ken

On 23/07/2018 12:17 PM, FLYaDIVE wrote:
Quote:
And to make things even more difficult; The circuit board is
conformally coated - NOT IN CLEAR! A rusty brown. Getting below the
coating to read the component and values becomes a surgeon's job.

Barry

On Mon, Jul 23, 2018 at 11:19 AM, Robert L. Nuckolls, III
<nuckolls.bob(at)aeroelectric.com <mailto:nuckolls.bob(at)aeroelectric.com>>
wrote:

At 01:39 PM 7/22/2018, you wrote:
>
> <yellowduckduo(at)gmail.com <mailto:yellowduckduo(at)gmail.com>>
>
> It looked like a modern metal film resistor to me. Mounted
> parallel with the circuit board with a light conformal coating.
> No evidence of it getting hot, discolored, or mechanically
> stressed. In fact there was no evidence of anything on the
> circuit board running hot. This unit was 12 years old and bolted
> to the main spar in the outboard wing bay. The other failed unit
> was about 8 years old at the time and has continued working OK
> since the repair. Both units were almost certainly from the same
> production run.

Interesting! By the way, do you happend to
have a schematic and/or maintenance manual
on the device?
Bob . . .


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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 720

PostPosted: Mon Jul 23, 2018 9:23 am    Post subject: aeroflash strobe repair Reply with quote

THANK YOU KEN!!!
I have two or three AeroFlash PS's.
I will LQQK for them.
Barry
On Mon, Jul 23, 2018 at 1:02 PM, C&K <yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com)> wrote:
Quote:
--> AeroElectric-List message posted by: C&K <yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com)>

Mine just had an amber colored coating that I could see through.
If it helps anyone there are 3 resistors mounted in a row perpendicular to the edge of the board near where the 3 wires connect that go to the flash tube.
The middle resistor was the problem one.
Ken

On 23/07/2018 12:17 PM, FLYaDIVE wrote:
Quote:
And to make things even more difficult;  The circuit board is conformally coated - NOT IN CLEAR!  A rusty brown.  Getting below the coating to read the component and values becomes a surgeon's job.

Barry

On Mon, Jul 23, 2018 at 11:19 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com) <mailto:nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>> wrote:

    At 01:39 PM 7/22/2018, you wrote:
Quote:
    --> AeroElectric-List message posted by: C&K
    <yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com) <mailto:yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com)>>

    It looked like a modern metal film resistor to me. Mounted
    parallel with the circuit board with a light conformal coating.
    No evidence of it getting hot, discolored, or mechanically
    stressed. In fact there was no evidence of anything on the
    circuit board running hot. This unit was 12 years old and bolted
    to the main spar in the outboard wing bay. The other failed unit
    was about 8 years old at the time and has continued working OK
    since the repair. Both units were almost certainly from the same
    production run.

      Interesting!  By the way, do you happend to
      have a schematic and/or maintenance manual
      on the device?


      Bob . . .



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