Re: (ET) E15HA PTO Problem

["Doug McCorkle" <dmccorkl sover net>]

I just replaced the diode on the diode-varistor board (well, actually I
built an entirely new board, since most of the components were either bad 
or
missing), using Radio Shack bridge rectifiers (half of one for the
forward-reverse diodes, and a quarter of another for the PTO diode), and 
the
PTO works normally now.  Such a nice easy fix!

Doug McCorkle

-----Original Message-----
From: Chris Zach [mailto:czach computer org] 
Sent: Saturday, September 10, 2005 8:40 PM
To: Doug McCorkle
Cc: elec-trak cosmos phy tufts edu
Subject: Re: (ET) E15HA PTO Problem


Might be the problem. If I recall, the E15 had heavy duty electronics, 
and used things like SCRs to set and hold items till power was dropped. 
My initial I haven't seen a thing guess is the SCR that is in series 
with that switch is blown, and as a result doesn't cascade to "on" when 
the switch is triggered and released.

Might also be the diode powers the SCR gate. Replace with something from 
Radio Shack; their bigger silicon diodes should be fine.

Chris


Doug McCorkle wrote:

> Hello all.  I'm a new E15 owner, the HA26E15HA version, and I'm having 
> some trouble with the PTO. The PTO works, but only when I hold the 
> switch up in the momentary on position, not when I release it into the 
> on position.  I just found that the diode CR-3 on the diode varistor 
> assembly board has a broken lead.  Is that all there is to this 
> problem?  And, is that an easy-to-find diode, as in Radio Shack? 
> Thanks for your help. Doug McCorkle
> 
> 
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