Sorvall TC6, Service Manual

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TC6 ® Repair and Replacement
5-5
move the assembly up not more than 1 mm (0.04 inch). Re-
tighten the hardware and go back to step 13 and proceed from
there to see if using the DOOR switch releases the door:
– If the latch is still unable to release the door , check for defective
solenoid, DOOR switch, wiring, or Control P.C. Board.
– If the latch releases the door , go back and perform the checks in
step 12 to make sure the door still closes completely.
5-3. Door Latched Microswitch
Adjustment
1. Open chamber door.
2. Turn centrifuge power off and unplug power cord.
3. Remove two phillips head screws from the bezel. Lift off, but
do not disconnect, the bezel.
4. Check to make sure microswitch is functioning properly:
a. Disconnect P231.
b. Connect the leads of a digital multimeter (DMM) to the
COM and the N.O. tabs on the microswitch and set DMM
for ohms: With the door in the latched position, the DMM
should register a value; with the door open, the DMM should
indicate open.
c. If the microswitch fails either check, manually operate the
microswitch lever.
d. Replace microswitch if it fails the check.
5. With DMM connected as in step 4, adjust microswitch:
a. Set the microswitch mounting screws so that the upper
screw is loose and the lower screw is just loose enough for
the microswitch to rotate.
b. Close and latch the door (when door is latched, the plastic
portion of the latching mechanism pops up).
c. Rotate microswitch so that the lever actuator is against the
latching mechanism until the DMM registers a value, then
(without moving the microswitch) tighten the top screw.
d. Pull down on the latch solenoid shaft to release the door.
The DMM should indicate open.
W A R N I N G
Unless microswitch is prop-
erly adjusted, centrifuge could start
without lid being latched.
!