2009 by ELTRA GmbH Germany – July 2009 – Service Manual Thermostep
Page 52
Fig. 3.10.4: RHS – Unscrewing the screws holding the motor
Reverse this procedure to fit the motor. Tension the belt so that there is about 1cm flex when
each side is squeezed. Take care to ensure that the lift mechanism is clear of the motor
mounting when raised and lowered.
To change the drive belt undo the 4 x 2.5 mm allen screws securing the carousel shaft and lift
out carousel. Reduce tension in the belt by loosening the 8mm nut and the 4mm allen screw
which secure the motor mounting plate. Lift off the belt and replace with a new one. Re-
tension the belt, replace carousel and set up the home position as described in the Lower
Furnace Procedure.
General Information
Carousel Motor Drive Gearbox
The Thermostep motor gearbox has a 40:1 ratio.
The Thermostep carousel rotates in a clockwise direction and has 1600 steps between each
crucible position.
3.11
Change of Power supply
Required tools:
5,5 mm allen key
Soldering tools
a.)
Remove the caroussels of the furnace to prevent them falling out of their fitting and
damaging the inside of the furnace.
b.)
Tilt the instrument to the LHS that you get access to the screws at the underside. Make
sure to tilt the instrument to a stable base!
c.)
Unfasten the 2 x 5,5 mm allen screws at the rear metal plate.
d.)
The power supply is covered by tubes, move them carefully aside to get free access.
e.)
The power supply is connected with two cables, one plugged-in and one hard-wired.
Plug off the one cable.
f.)
Trim the hard-wired cable through at appropriate lengh.
g.)
Remove the insulation of the cable and prepare the strands for soldering.
