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Strobe problem

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Bryan Allsop

Joined: 29 Jun 2007
Posts: 78

Posted: Tue Jun 24, 2008 1:47 pm Post subject: Strobe problem

My strobe has stopped working! The problem could be with the wiring, the strobe, or the box circuit.

  

 Before I start reaching for the box in the confined spaces at the rear of the fuselage, I thought it would be worth while asking advice from others who had the problem. Is there a sensible diagnostic procedure to avoid wasting time?

  

 Bryan

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budyerly(at)msn.com
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Posted: Tue Jun 24, 2008 3:35 pm Post subject: Strobe problem

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Bryan,

 Go to whelen.com and view the Installation and service manual notes.

 Check power and ground to the unit.

 Ohm out from the unit to the wings.

 Remove unit and bench test.  

  

 If a Whelen unit (especially the older ones) has set for a long while, they  need to be brought up to voltage slowly.  I use a 9 volt drill battery to  charge it for 15-30 minutes if the plane has not been used in a long time (12  months).   Some of the units had a fuse inside the unit that could be  changed, but that was a long time ago.  Newer units are pretty full  proof.

  

  If the unit is getting power and not working, best to send it in.  I  have repaired one in the shop at the customer support guys suggestion, and  it was a blown fuse.  Unless you are familiar with the unit, do not open it  up and just poke around.



 Whelen is great about a fast turn around on the box.

  

 Bud Yerly

 Custom Flight

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steven.pitt2(at)ntlworld.
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Posted: Tue Jun 24, 2008 10:14 pm Post subject: Strobe problem

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Wed Jun 25, 2008 1:29 pm Post subject: Re: Strobe problem

Sorry Bryan,



You'll have to get to the box for meaningful diagnosis. There is very little

to do without that step.  You did not describe the failure, is it just 

complete lights out, intermittent, one sided, or something else?



When you flip the switch in the cabin, does the ammeter react?



As Bud suggests, you need to find out if juice is flowing out to the supply

box.  If it is not, you can fix that. If it isn't I would recommend you

disconnect the three wire bulb leads and check continuity one at a time

(since they do not connect at the bulb) with a long extension wire.

If those are OK, then send the box out for repair.  I would not feel

comfortable explaining the innards since very high voltage lives there

and you would probably require a scope to check anything but an

internal fuse.

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