[Premium-Rx] WJ-8711 and WJ-8712 Power Supply Poll

[Steve Pappin via Premium-Rx]

Hi Gary,

It's getting to the point where many of them they can no longer be repaired 
and made reliable. We have an engineer who repairs them but he's finding it 
harder and harder to diagnose the issues. Once critical parts fail and or 
the plating starts to rot the unit is bound for the trash can. Failures are 
going to start increasing exponentially. I'm not trying to start a stampede 
but we have developed a number of single points:

1) Bad capacitors
2) Failed plating
3) Shorted SCR's
4) Connector contacts loosing tension
5) Blown NTC's

Another words - aging due to heat, smoke, salts, and line disturbances. We 
are also finding latent manufacturing defects.

The power supplies can probably be repaired once and maybe twice, but beyond 
that rework weakens PC boards that were not designed to be reworked.

Best Regards,
Steve

----- Original Message ----- 
From: "Gary Geissinger" <ggeissinger at digitalglobe.com>
To: "'Steve Pappin'" <pappy92651 at yahoo.com>
Sent: Monday, September 21, 2015 2:44 PM
Subject: RE: [Premium-Rx] WJ-8711 and WJ-8712 Power Supply Poll


Steve,

I am late thinking about this so I apologize if this has come up before.

Is it possible for someone to be trained or otherwise get up to speed so 
that they could repair them?  Or is the failure mechanism catastrophic?

Gary WA0SPM, member US Army MARS

-----Original Message-----
From: Premium-Rx [mailto:premium-rx-bounces at mailman.qth.net] On Behalf Of 
Steve Pappin via Premium-Rx
Sent: Monday, September 21, 2015 3:38 PM
To: premium-rx at mailman.qth.net
Subject: [Premium-Rx] WJ-8711 and WJ-8712 Power Supply Poll

I'm taking an informal poll to see what I can do about all of these failing 
SP1348 power supplies. The failure rate is increasing and it's going to get 
ahead of my capacity to service them. So here are two realistic options:

1) New drop in exact fit replacement unit - $$$ Expensive due to low volume 
of manufacturing

2) Replacement unit that drops into the original SP1348 metal enclosure - 
$240.00 to $300.00 depending on quality and volume

There are ways to reduce cost but they are not good:
a. Made in China - I don't want to do this b. A kit that you have to 
assemble - I can see how this could go all wrong with miswires and voltage 
hazards c. Finance - Credit line to buy materials in quantity to keep costs 
low - and the risk if the power supplies don't sell

So the question is multiple choice: Would you be willing to pay; a. $240.00 
?
b. $300.00 ?
c. $500.00 ?

In 10 days I will send out another email with the results of the poll - 
anonymous. My guess is that there will be very little demand until failures 
reach epic proportions. Remember that some of these power supplies are 20 
years old and early switchers commonly failed after 10 years if that.

Best Regards,
Steve
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