Deep fried inductor...
ard at p850ug1.demon.co.uk
Fri Feb 19 14:20:35 CST 2010
> On the Siemens drives also used in the H89 and H17, there is an inductor
> in series with the +12 to the spindle motor. It's a hash choke that keeps
> the motor noise from going back into the +12 rail. When the grease in
> the spindle motor gets old and sticky, the motor draws way too much current
> at startup (if it ever does start spinning) and toasts this inductor.
If this is the Siemens drive used in the Z90, I have the schematics here
(io the Z90 hardware manuals). I can't see an 'L5' at all, but the drive
I have has a separate motor control PCB with a series choke (but a 10uH
one) in the supply line. It's easily posible that later drives put
everything on one PCB (as Tandon did).
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