Hi,

I have a Ryobi cordless drill where the speed control has gone but it still
works at full speed.  I was wondering if anyone has taken something similar
apart and could point me in the right direction.  I've searched the web but
come up blank.

This drill has is about 8 years old but has only seen occasional work.  When
using it yesterday I found that I could no longer control the speed.  It was
either all or nothing.  When I slowly squeeze the trigger I can barely hear
a very high pitch noise (as I usually hear with slow speed operation) but
with no movement from the motor and using my hand I can easily turn the
motor in both directions.  As I squeeze a bit more the drill turns on full
speed.

I was wondering if there was a secondary switch in the trigger that would
by-pass the PWM and FET system and connect the battery directly to the
motor.  The high pitched noise I am assuming is the PWM.

Any ideas on how these things work?

Regards,

Gordon Williams

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