[Amps] Commander HF-1250 problem

[Carl]

My first pass guess would be the power switch or input relay which is 
activated from the control board. Im assuming the interlock is actuated and 
good.

The relay can be bypassed for testing and an Ohmeter on the switch.

There is nothing in the below deck PS that can affect the input since the 
fuses are good BUT carefully check the holders for continuity; Ive seen a 
few charred and cracked.

The filter caps, equalizing resistors and metering resistors are all below 
deck and if going there replace all at the same time. While supposedly 
cooled by the blower they are actually getting less cooling than if out in 
the open.
Use 100K 3W MOX for equalizers and raise them off the likely already charred 
PC board. For metering resistors IRC has a nice 1M 1000V rated 3W that is 
very reasonable. I use the new 105C CDE 381LQ electrolytics.  While access 
is a PITA, the complete job is 3-4 hours.

Carl
KM1H



----- Original Message ----- 
From: "doug ferguson" <thenewt at msn.com>
To: <amps at contesting.com>
Sent: Tuesday, November 19, 2013 1:35 AM
Subject: [Amps] Commander HF-1250 problem


> Thanks for the replies.  I checked out the cord, plug and all other 
> obvious connections
> that I could reach and everything is hardwired in place and nothing loose. 
> It was
> suggested that it's probably a power supply component which I'm afraid is 
> probably
> the case.  They are very tough to get at so was hoping it was something 
> easy.  One
> other thing I found is some sort of solid state relay between the power 
> switch and
> the transformer.  Not sure how to test it so guess I'll start the research 
> on that
> before I start tearing the tank apart.
> 73,
> Doug - N7NM
>
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