Foerster CIRCOGRAPH DS, Operating Instructions Manual

Page: 56 / 67

5.3 Removing and fitting the test heads MAINTENANCE
48
6.452
NOTE !
Use test heads as a set with the same specifications. The type number
is found on the side of the test heads.
Clean all parts, especially bolt (2), sealing ring (3), collared bushes (ref.
to Fig. 5.6) and test head bearing bush .
Reassembling vice versa.
Note the correct installation position:
The stop on the test head must contact the control edge of the rotating
disc.
Do not kink or twist the ribbon cable.
Check mobility of the test head.
Engage the tension spring in the annular grove of the spring bolt,
the test head is forced to position CLOSED during stand still of rotor.
NOTE !
In application drawing line the spring may bee hooked to the rear side
bolt of the test head to open the test heads, if rotational speed de-
creases under the minimum speed.