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MMD > Archives > December 2009 > 2009.12.15 > 09Prev  Next

Tempo Lever Won't Adjust the Tempo
By John A. Tuttle

Hi All,  Paul Meehan's problem Tempo levers probably share the same
root cause.  I'm going to go out on a limb and suggest that the problem
is the position of the fast reroll slider.  He can check this by visual
examination.  Just open the tempo control box and move the Play/Reroll
lever to the Play position.  In that position, the slider must be
covering the vacuum port 100%.  Then move the Play/Reroll lever to the
Reroll position.  In this position, the slider must uncover the vacuum
port 100%.

While he's in there, it would be a good time to check the position of
the Tempo slider.  Move the Tempo lever to the Zero position.  In that
position, the slider should cover the tempo slot 100%.  Now move it to
the fastest speed (probably 120 or 130).  In this position, the tempo
slot must be open 100%.

Once both sliders are in their correct positions, close the control box
and begin the adjustment of the air motor governor.  Instructions are
located at

If his units use pneumatic switching for Play/Reroll, the facts
concerning the opening and closing of the vacuum port remain the same.
The port must be closed 100% during the Play cycle, and open 100%
during the Reroll cycle.  The only difference is the manner in which
the port is opened and closed.

John A Tuttle
Brick, New Jersey, USA

(Message sent Tue 15 Dec 2009, 16:43:08 GMT, from time zone GMT-0500.)

Key Words in Subject:  Adjust, Lever, Tempo, Won't

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