Metrohm 799 GPT Titrino - Manual (Page 210)

4.4. Releasing a locked spindle
799 GPT Titrino 206
4.4 Releasing a locked spindle
with inserted Exchange Unit
• The burette drive may very occasionally jam at the top or bottom end of the cylin-
der. 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. 8
• Disconnect instrument from power supply!
• Remove control knob
• Place instrument over edge of bench to allow the M3 screws to be removed (Fig. 8)
• Remove M4 screws
• 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!
• 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.)