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Motor fails to turn
With power removed from the control unit, check that the wheel is free to
turn without obstructions. Also, this condition may be caused by a broken
cable between the control unit and the head. Substitution of a known func-
tional cable is the best solution. (See Page 17 for details on replacement
cables.)
Note that the life of the motor is limited. Long term high speed use of the
motor will result in faster wear and shorter life. Because of this limited life-
time, the chopper head has a 90 day warranty, while all other parts have a
one year warranty.
Motor oscillates wildly
Recall the factory default settings. This will place the instrument into known
conditions. If the oscillation stops, then the Sync Input signal may have been
unstable. Verify the stability of Sync Input with an oscilloscope or frequency
counter. The Sync Input frequency may have been outside of operating limits
which are determined by the mode, H, S and the wheel type. Refer to the sec-
tion on FREQ for more details.
Observe F
outer
on an oscilloscope. If the cable or optical sensor is damaged,
the signal will remain high or low. If this is the case replace the cable between
the head and the control unit.
Check for the correct setting of Wheel on the front panel.
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