HP 8921 problems

[Niel Skousen-2]

Good Afternoon All,

I have an HP 8921 Service monitor, and when I powered it up today, it worked for about 5 min...  then the power supply started to sag, the display crashed, and I powered down.

Any one have any experience with HP8921 service ?    Seems like the power supply overloaded, and I can smell the smoke  8-(   but I cant see anything obvious inside (eg puff'ed up / split electrolytic cap's in the power supply etc)  Its been off for several months after a move.

Anybody with idea's or suggestions, please drop me a note off line

TIA

Niel
WA7SSA
nskousen (at) talisman-intl.com
nskousen (at) ecsecurityinc.com

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[Fred Townsend-2]

Niel:
I think electrolytics are a good guess. Also selenium rectifiers but I don't
think that model uses them.
The problem is aluminum electrolytics are not made anymore. You can
substitute polymer electrolytics but while they are electrically
interchangeable they are not form-fit interchangeable. Sometimes it takes
some mechanical rework to fit them in.
I have seen aluminum electrolytics on the surplus market but they will be
old and unreliable. Your best bet is the polymers. You'll find them at
Digikey, Allied, and the like.
73
Fred, AE6QL
-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Niel
Skousen
Sent: Tuesday, March 17, 2015 2:00 PM
To: Elecraft Reflector; QRP-L Mailing List
Subject: [Elecraft] HP 8921 problems

Good Afternoon All,

I have an HP 8921 Service monitor, and when I powered it up today, it worked
for about 5 min...  then the power supply started to sag, the display
crashed, and I powered down.

Any one have any experience with HP8921 service ?    Seems like the power
supply overloaded, and I can smell the smoke  8-(   but I cant see anything
obvious inside (eg puff'ed up / split electrolytic cap's in the power supply
etc)  Its been off for several months after a move.

Anybody with idea's or suggestions, please drop me a note off line

TIA

Niel
WA7SSA
nskousen (at) talisman-intl.com
nskousen (at) ecsecurityinc.com

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[Phil Wheeler-2]

Try Google and look for a service manual on line.
I've had good luck that way with other such items.

Phil W7OX

On 3/17/15 2:00 PM, Niel Skousen wrote:

> Good Afternoon All,
>
> I have an HP 8921 Service monitor, and when I powered it up today, it worked for about 5 min...  then the power supply started to sag, the display crashed, and I powered down.
>
> Any one have any experience with HP8921 service ?    Seems like the power supply overloaded, and I can smell the smoke  8-(   but I cant see anything obvious inside (eg puff'ed up / split electrolytic cap's in the power supply etc)  Its been off for several months after a move.
>
> Anybody with idea's or suggestions, please drop me a note off line
>
> TIA
>
> Niel
> WA7SSA
> nskousen (at) talisman-intl.com
> nskousen (at) ecsecurityinc.com

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