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(ET) E20 - #4 card



Title: Message
I recently tried to rebuild a #4 card from an E20 tractor with interesting results.  I replaced all the diodes on the original board, both the big & little ones.  Checked that all traces were good to and from diodes and other components.  Plugged card into connector and now the tractor is behaving oddly.  In forward position I only have 3 speeds now, in reverse I have 6 plus cruise setting?  I have checked and rechecked all connections and components, but can't figure out what has happened to cause the reversal of dirctions.  My next step will be to replace the resistors and the two ic's on board.  Does anyone know what the 2 components Q401 & Q402 are called, and what type(s) are they?
 
Thanks,
 
Bob K
 
 
 
 
 
Bob Kleinbrahm
Senior Network Engineer
First Republic Bank
San Francisco, CA. 94111
415 288-1478
rkleinbrahm firstrepublic com
 


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