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Re: (ET) E15HA PTO Problem
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
missing), using Radio Shack bridge rectifiers (half of one for the
forward-reverse diodes, and a quarter of another for the PTO diode), and
PTO works normally now. Such a nice easy fix!
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.
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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> Elec-trak cosmos phy tufts edu