Replacing Parts
Speed Control:
Replacement of the speed control requires removal of the
bottom cover casting. Turn unit over and remove 6
screws holding cover and lift off.
To replace speed control, remove the control knob (2
setscrews) and a retaining nut to separate it from the
panel. Unplug the terminal connections from the old ter-
minal unit and plug them into the new one. Reverse this
sequence to put the control unit back into position.
The new control unit must be calibrated in the following
manner. Locate the maximum and minimum speed
potentiometers on the speed control. Lay the unit on its
side and elevate the housing so that the titer plate plat-
form will clear the table to permit an unobstructed area of
shaking motion.
Start the unit and turn the speed control knob fully clock-
wise (maximum speed). Using a suitable tachometer and
a small plastic screwdriver, adjust the maximum speed
potentiometer to 1100 rpm.
Next, rotate the speed control fully counterclockwise (min-
imum speed). Now adjust the "minimum" potentiometer to
the point at which platform stops moving.
If the procedure as outlined has been followed carefully,
the new speed control is now calibrated.
Replace bottom cover casting and insert and securely
tighten the 6 screws that were previously removed.
Silicone Tubing Sections:
To replace the silicone tubing sections on the platform,
remove the 4 screws holding the platform and lift off.
Silicone rubber tubing is available from most laboratory
supply houses or from Thermo Scientific. Use 1/4" ID x
7/16" OD and cut to 1-5/16" length.
Reassemble the unit carefully by following the reverse
order from the preceding.
11
Maintenance
Note
Make no attempt to service or repair
a Thermo Scientific product under
warranty before consulting your dis-
tributor. After the warranty period,
such consultation is still advised,
especially when the repair may be
technically sophisticated or difficult.
Warning
Disconnect plug from electrical out-
let before attempting any
maintenance or repair of the unit.
To avoid risk of electric shock, dis-
connect equipment from power
source before removing the bottom
cover or performing any service.
Warning
Do not operate shaker without plat-
form. To do so will produce a serious
imbalance and cause the entire unit
to walk. In addition, exposed rotating
parts will be a hazard to fingers.
