Epson HX-20 repair details

From: Mike <ipscone_at_msdsite.com>
Date: Mon Oct 14 13:52:00 2002

I have most of the manuals for the HX-20. I have some technical
documentations. I will check to see if there is also a schematic.

Mike

> Hi there,
>
> I have a two Epson HX20's (which we use in our reasearch lab - yes still
> - to control some
> equipment) one of which has sufferred a failure of the power supply on
> the main CPU
> board (details below) and I need to get hold of a schematic if one
> exists. I beleive that Epson produced
> a repair guide - does any one know where I might be able to source this
> information.
>
> I have had a plough through the archives to this list and there are some
> very helpful people out there
> and maybe if anyone has some experience with this machine and can give
> me pointers - the following
> might help ...
>
> The batteries and external adaptor are good (new) charging correctly and
> delivering 4.8 V.
> However, the power switch has no effect (no LCD, no beeping)
>
> The main power rails seem to be off - there is 4.8 v at one test point
> 0 at another an 2.8v scattered
> around the board. There seems to be no 17 V which I beleive is needed
> for the LCD.
>
> The previous owner reported a burning smell so component failure is
> suspected, but no obvious signs
> on the transistors.
>
> A previous writor in the archive (Tony Duell) suggests that a volatge
> should be present on the collector of Q8,
> this is absent.
>
> Thanks in advance
>
> Yours
>
> Matthew Clemence
Received on Mon Oct 14 2002 - 13:52:00 BST