Re: (ET) Card 4 status, might work, hm.

["David Roden" <etpost drmm net>]

On 11 Sep 2010 at 22:55, Chris Zach wrote:

> ... blown resistor ... 10 gauge crimps ... melted ... bolts ...
> overheated ... sense wires ... covered with carbon ... speeds 6,7,8
> are still out ... strip of metal gets hot .... card 4 ... amplifier
> transistor is shot ... MOV was once again blown to bits ... caught fire
> ... 

Yikes.

About 5 years ago, I ripped out all that Apollo-era hardware and put in a 
modern PWM controller instead.  That took me from having to tinker with a 
card, reverse relay, or what have you about every third time I used the 
tractor ... to just USING it.  

Since then the only problem I've had has been a flaky reverse switch - and 
that's my own fault for installing a cheap made-in-Taiwan Radio Shack 
toggle 
switch for reverse.

I sympathize with the notion that you can troubleshoot the GE controller 
with an ohmmeter.  However, I don't want to be troubleshooting it all the 
time!  A tool that you have to regularly use other tools on isn't my idea 
of 
a truly useful tool.  ;-)   


David Roden - Akron, Ohio, USA

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