Switching PSU Theory of Operation / Repair Tips & Tech niques

From: Douglas Quebbeman <dhquebbeman_at_theestopinalgroup.com>
Date: Thu Jul 27 09:16:20 2000

> Hi
> I'm still puzzled over the 600V reading. My guess
> is that there is a problem in the meter. As far as I know,
> the inputs are usualy configured as a doubler when used
> with 115V and a bridge when used for 220V. I don't
> recall the circuit but I remember it was a clever trick
> in that one could change it with a single jumper.

I wish my Fluke was working (the LCD has gone black). I
dropped my RatShack analog meter a few days back, and
the needle sticks in spots, but a tap on the meter face
usually frees it up.

However, it measures 115v AC correctly.

But, I'm going home at lunch to make a few more careful
measurements of the PSU primary (the PSU is disassembled
now, and I've unsoldered some parts out of the secondary
PCB to test them, so we won't have any of that confusing
the issue).

> What a BBU?

I'm assuming it's a battery backup unit.

-dq
Received on Thu Jul 27 2000 - 09:16:20 BST