[R-390] [r390] Question -- now PS question

[Paul H. Anderson]

On Wed, 10 Apr 2002, Al Solway wrote:

> Roger, David and All,
> 
> David, post all you want. You are getting through. It would be
> unthinkable if you could not. 
> 
> Roger, he does have a Web page. All the info on the R-390 is still there
> for all to use. Used one his P/S tit bits last night. The one where the
> center tap on high voltage transformer not wired as per the schematic.
> Mine is wired as he indicates and made my problema lot easier to solve.
> 
> http://www.davemed.info/
> 
> Al
> 

Al - were you using a mod-1 power supply, and have you found any chassis
wiring differences?

I'm very confused by this because I'm looking at three different 390/391
power supplies, and there are indications of them having been wired three
different ways:

no-mod PS prior to HV CT change
no-mod PS after HV CT change
mod 1 PS with HV CT going to a different place altogether

The way I read David's page, he mentions two - no-mod prior to HV CT
change, and no-mod after HV CT change, but as near as I can tell, not the
mod-1 PS.

I can get the exact pinout differences if it would help anyone.

Does anyone have a mod-1 r-390/r-391 power supply to compare notes with?

The reason that I care about this is that I have this mod-1 power supply
that appears to be factory wiring, but it doesn't work in a chassis that
does work with a no-mod post HV CT change (the one Dave relates on his
page).

What that means is there must be a corresponding chassis change for a
mod-1 power supply that I need to be looking for, too, and I want to know
what that is before I needlessly hack a good original mod-1 PS.  Hope this
makes sense.

Paul Anderson