Determining input voltage for switchmode PSU

From: Mark <mark_k_at_iname.com>
Date: Thu May 11 15:43:09 2000

Hi,

This isn't specifically classic, but maybe someone can help.

I have a SCSI optical drive mounted in an external case, made in 1992. There
are no labels on the case at all. I was sent this from the United States
(where mains voltage is 110VAC); I'm in the UK (where mains is 240VAC).

Whilst I can use this unit in conjunction with a step-down transformer, is
there any "rule of thumb" method for determining whether a switchmode PSU is
auto-ranging? Rather than just connecting the unit up to 240V and risking
damaging the PSU, I'd like some idea of whether it is designed to run from
240V.

The fuse on the power supply PCB is 2A 250V, if that's any indication. There
is no obvious wire link that could be moved to select between 110V and 220V
operation.


A label on the PSU reads
  MODEL NO. SP35W2P-141

There is also a logo which looks something like this:

  |
  | __
  | /
   \__|___
      |
       \__
That is, the letters L and E joined together. Any idea which manufacturer this
is?


-- Mark
Received on Thu May 11 2000 - 15:43:09 BST