[Johnson] Invader 2000 fuse blows

Tue, 30 Dec 2003 11:52:25 -0500

OK.  Several people have said check the filter caps in the power supply.  I
forgot to mention that if I disconnect the load (transmitter) from the power
supply, the fuse doesn't blow.  Please correct me if I'm wrong, but wouldn't
a leaky filter capacitor in the supply warm and possibly blow the fuse even
without a load since they are connected in parallel with the load?

George

----- Original Message ----- 
From: "George" <[email protected]>
To: <[email protected]>
Sent: Tuesday, December 30, 2003 10:45 AM
Subject: [Johnson] Invader 2000 fuse blows

> Hi all,
>
> Before I end up with no hair left (from pulling it out one at a time) I
> could use some help.
>
> I have an Invader 2000 that blows the low voltage fuse.  With the high
> voltage supply disconnected and the transmitter in standby, the fuse will
> blow after about 10 minutes of warmup.  I had a standard 5R4 in the power
> supply and it would arc over just before the fuse blew.  I changed the 5R4
> to a military grade and it no longer arcs but the fuse still blows.
>
> If I remove the 5R4 the fuse doesn't blow.  If I remove the 5U4 and leave
> the 5R4 in, the fuse doesn't blow.  With both tubes in, it blows.
>
> Any suggestions?
>
> Thanks
>
> George, NY2O
>
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