[Fourlanders] Brian's Big Diesel Generator

[Jim Worsham]

I was thinking the same thing as Ron.  If the 12 VDC came in contact with
the ground connections that would explain the burnt ground traces.  Some
buss wire and careful soldering might be able to repair it.  I have an EPROM
read/write capability also.  Not as fancy as what Ron has though.  I will go
ahead and break out my generator, check the oil, plug, etc. and make sure it
is running OK if we need it.  It hasn't been run in over a year so it will
be interesting to see how much work it is to get it to crank and run. Let me
know if there as anything I can do to help.

73
Jim, W4KXY

-----Original Message-----
From: fourlanders-bounces at contesting.com
[mailto:fourlanders-bounces at contesting.com] On Behalf Of Rogers, Ron
Sent: Saturday, May 05, 2007 4:38 PM
To: rfacres at gmail.com; Fourlanders Contest Group
Subject: Re: [Fourlanders] Brian's Big Diesel Generator

Yep, I have full EAPROM read-write-alter capability !!!   Just give me the
chip.
 
I have a great B&K system here at home QTH and a complete Data I/O system at
work.
 
BUMMER on the generator.....how much for a replacement board ? 
 
 If  ground traces were simply blown by 12 volts coming in contact that
would appear to be a repairable situation with buss wire.
 
Ron
WW8RR
 

________________________________

From: fourlanders-bounces at contesting.com on behalf of Brian McCarthy
Sent: Sat 5/5/2007 4:04 PM
To: Fourlanders Contest Group
Subject: [Fourlanders] Brian's Big Diesel Generator



I have been diagnosing the generator today. At the moment, it is a bit grim.
There are atleast two traces burnt on the control PCB. This PCB has a dip
socketed EPROM and self contained battery backed RAM. The burnt traces are
ground lines that are related to user defined input sensors. I still need to
remove a soldered on ground plate to see if there is further visible damage.

It looks like my worst fear was true. The power connections modified by the
previous owner of the generator left the end of a bolt sticking out of a
piece of heat shrink. This bolt was connecting two wires together with the
bolt and had constant 12VDC on them. I think this hot end of the bolt was
laying on top of a terminal strip in the overall control box. The terminals
where I had seen it laying were the gound connections for the inputs as
noted above.

Does anyone have an EPROM reader/writer? I am guessing the EPROM is a
27256 or 27512, but I will need to lift the label off to make sure. I may
want to see if the EPROM is still readable as part of the diagnostic
process.

It does seem possible to hotwire the generator. It looks like I could do it
with two toggle switches and a momentary switch. The functions seem to be
heater/glowplug, fuel pump and starter. It looks straightforward, but I want
to read through the diagrams a few more times to be sure.

Bottom line, break out the old gas generators. Change the oil and check them
out. I will do this with "big hos" this evening or tomorrow.

I will keep the group advised,
Brian
NX9O
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