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well i replaced the diodes on both variable channels and Variable 1 world fine - but the Variable 2 is just outputting full input voltage - i have it connected to a z1000 - i have the MTH Handheld set and it shows the voltage as 0 then i can raise it to 5-5.5 etc but the actual output is constant and equal to the input voltage - any ideas on what's is happening?  i tired another TIU and both variable channels work  fine  -

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@ted K posted:

The port is not set to fixed.  if i have a shorted FET(?) what do i need to do to fix? i doubt i will use the Variable 2 port but still would be interested in why its not working - thanks for the information ad replies - really appreciate this forum

The FET's for the variable channels go down the middle of the board, there are four for each channel.  Usually, only one is bad, but finding it in circuit is tricky.  If I have to remote them to test it, I just use a new component.   I typically replace a pair of them, and if that doesn't work, I replace the next pair.  The FET's are fairly cheap, it's the labor of replacing them that runs up the cost.

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