Emergency locking for 3ESPC(D)s
My 3ESPC or 3ESPCD will not lock and I need to transport it.
This situation may arise when damage has occurred to the power input circuitry of the instrument. The instrument will need to be returned to a service centre for repair but, if transported with the masses unlocked, significant additional damage may be caused.
- If possible, find a safe, clean, dry place to work.
- Remove the lid and tube, exposing the mechanics. Take particular care not to knock or catch any of the internal components when removing the tube.
- Locate one of the horizontal locking motor clamp screws (circled in the
- Using a small, flat-headed screwdriver, loosen the screw by a turn or two,
then slide the motor upwards until the two gears disengage:
- Using a small, flat-bladed screwdriver engaged in the gear teeth, manually
turn the driven gear until the mass is locked:
- Slide the motor back down until the gear teeth re-engage and then re-tighten the motor clamp screw.
- Repeat this procedure for the second horizontal mass.
- Locate the vertical locking gears, as shown in the photograph:
These gears can normally be turned by hand to lock the vertical mass. If they are particularly difficult to move, a small, flat-headed screwdriver can be used to help rotate them.
- Replace the tube and lid. The instrument can now be safely transported to a repair centre.