Metrohm 775 Dosimat - Manual (Page 13)

2.4 Releasing a locked spindle
775 Dosimat
9
2.4 Releasing a locked spindle
with inserted Exchange Unit
The burette drive may very occasionally jam at the top or bottom end of the cylinder. If
jamming occurs at the top or when the drive is out of function, the Exchange Unit can no
longer removed. In this case, it is necessary to proceed as follows:
2 screws (M3 fillister head)
knob
edge of bench
2 screws (M4 countersunk)
Fig. 3
1. Disconnect instrument from power supply!
2. Remove control knob.
3. Place instrument over edge of bench to allow the M3 screws to be removed.
4. Remove M4 screws.
5. Lift off top part of instrument together with Exchange Unit in the manner shown by
the arrow.
The electronic circuits are now accessible!
On no account touch these!
6. Remove spindle from mechanical stop by turning the large gear wheel. (In case
that the motor is inoperative, position spindle by hand to zero position.)