Re: [CAD_CAM_EDM_DRO] Re: G201 death/repair/questions/problems (long post)

Mariss,

Thank you so much for the troubleshooting instructions. Your honesty
and integrity is second to none. I look forward to doing much more
business with you in the future.

Now to find the cause of the problems and solve it before blowing more
FETS or killing any chance of repair.

Thanks again,

Chris

> This is a long post. For trobleshooting non-supported drives, see
> immediately below. To set the record straight about these drives, see
> the "P.S" at the end of this post.
>
> Trouble-shooting non-supported drives:
>
> 1) Inspect the PCB for charring. If a fuse has not been used, enough
> current can flow thru the drive after a fault to char (burn) the
> board. If any burned or carbonized areas are noted, the drive cannot
> be repaired. Carbon conducts electricity.
>
> 2) If it passes test (1) then test the power MOSFETS. Set a
> multimeter to "Ohms" and measure each of the 4 phase output
> resistance to ground terminal and then to the power supply terminal.
> This requires 8 measurements, (1 to 3, 1 to 4, 1 to 5, 1 to 6, 2 to
> 3, 2 to 4, 2 to 5 and 2 to 6).
>
> Good readings will be megohms, bad readings are less than 100 ohms,
> usually a dead short.

<snip>