[TenTec] How Much Damage From Reversed Polarity?

[Bert Braun, DD5XL]

doc wrote:

> In the process of momentarily relocating my Jupiter
> to another room with a Windows PC (to load the updated
> OS) I think I may have applied reverse voltage to the
> power connector ... Arghhh!

> Symptoms are no response when the power switch is
> activated (the fuse is fine).
> 
> Time to pack it and ship it to TenTec?  ;-(

Wait!
Let us try a more comprehensive diagnosis?
Say, can you hear the power relay clicking when you try to switch on 
your Jupiter?
Regarding my circuit diagram of the 538 Jupiter, there is no reverse 
polarized diode to protect the power input.
But the mains switch triggers a relay via a switching transistor. Only 
when this realy is activated, the main circuits are connected to the 
mains power. So you have a good chance, that you only damaged this 
switching circuit, not the main transceiver circuits.


73 de Bert, DD5XL


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