Fw: Re: [1000mp] Maintenance and Repair of the Mark V FP-29 PSU

[Ronald Oberloh]

--- On Sat, 1/26/08, SavageBR at aol.com <SavageBR at aol.com> wrote:

> From: SavageBR at aol.com <SavageBR at aol.com>
> Subject: Re: [1000mp] Maintenance and Repair of the Mark V FP-29 PSU
> To: wa0kds at yahoo.com
> Date: Saturday, January 26, 2008, 8:59 PM
> Ron,
> Please forward the following note for me with the title
> "Cleaning The  
> FP-29".  I think it might be helpful to others.
> Thanks, Bruce AA4Z
>  
>  
>  
> After reading about FP-29 failures due to dust collection
> inside the unit  
> causing shorts on the PC board, I decided to clean my
> supply. I found it to be  
> very dusty dirty. I am sure there are several ways to clean
> the supply, the  
> following approach seemed to work well for me. 
>  
> Obtain a fresh can of "Air Duster" or equivalent
> with a 4-5 inch extension  
> tube. This product is usually available at Radio Shack, a
> camera store or  
> computer store. Also obtain 4-5 cotton swabs and some
> denatured or  isopropyl 
> alcohol. Clear a well lighted place to work.
>  
> Turn off the supply and unplug it at the AC wall plug. Then
> remove the AC  
> cord at the supply. 
>  
> Note that to remove the DC power cord that runs to the Mark
> V, you need to  
> depress the small clip on the flat outside edge of the
> supply  connector. This 
> will release the little finger on the power cord  connector
> that  snaps in 
> place when you mate the connectors.
>  
> Inspect the supply from the outside. If the small blower on
> the bottom has  
> collected considerable dust, the supply needs cleaning. You
> cannot clean the  
> supply properly through the blower opening. I did not
> remove the blower guard 
> or  blower.
>  
> To remove the supply cover, remove 8 black screws and 2
> unpainted  screws 
> from the cover using a small phillips head screw driver.
> Note the  location of 
> the 2 unpainted screws. They will tell you which way to
> replace the  cover. The 
> cover will then slide up and off.
>  
> At this point, use the Air Duster to remove most on the
> "loose dust". If  
> typical, significant dust will remain on the blower.
> Working from both sides of  
> the supply, use swabs damp with alcohol to carefully clean
> the blower blades 
> and  housing.
>  
> The failures mentioned earlier, were apparently caused by
> dust between the  
> internal aluminum chassis and the circuit PC board. To
> clean this area, it is  
> not necessary to remove the PC board. Carefully remove the
> 4 black screws from 
>  the outside bottom of the supply. You can now tilt up each
> end of PC  
> board/chassis assembly. Slide the Air Duster extension tube
> into the space  between 
> the chassis and PCB and blow out the collected dust. Slide
> the  tube in and 
> out, up and down, to remove as much dust as possible. Do
> this  on each end.
>  
> Being careful to not pinch any wires, replace the 4 black
> screws, on  the 
> bottom of the supply, that hold the chassis/PCB assembly in
> place.
>  
> Now clean the inside of the cover to remove all collected
> dust. Inspect the  
> supply assembly to be sure it all looks OK. Blow out the
> assembly one more 
> time  with the Air Duster and replace the cover. Be sure to
> install the cover 
> with the  two holes, for the unpainted screws, in the
> correct location next to 
> the  two brackets. Be sure the cover sits on the ridge of
> the front panel. Check 
>  to see that the cover does not pinch any wires and then
> replace all cover  
> screws.
>  
> 73
> Good luck
> Bruce  AA4Z
> 
> 
> 
> 
> 
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