75
Troubleshooting and Service
8. Then raise the mandrel up around the stir wire. Align the mandrel
so the stir-wire channel is perpendicular to the front edge of the
chassis and so the flange is flush, with no gaps between the flange
and the underside of the chassis. Retighten the two setscrews to
hold the mandrel in place. Do not overtighten—overtightening will
damage the mandrel.
9. The probe length is factory adjusted to the mandrel, and should
not require further adjustment. Proper positioning of the probe
and stir wire can be quickly confirmed with the probe and stir-
wire alignment tool provided with the instrument, or the method
described in the Mandrel, probe, and stir/freeze wire alignment
section shown later on in this chapter.
10. Reconnect the probe connector on the head chassis, taking care
once again not to touch or bend the connecting pins.
11. Arrange the leads so that they will not touch the clapper (Figure 7,
Item 3) or be pinched when the head cover is replaced.
12. Replace the head cover and its two attaching screws.
13. Reconnect the power cord and turn the instrument on.
14. Make sure the Supervisor/Operator keyswitch is in the Supervisor
position while using the SETUP and CALIB menus (see Figure 5).
15. When the operating head rises and Press START to Continue begins
to scroll across the display, press the START key.
16. When the display changes to Osmometer Ready, press the TEST
key. The display will change to Select Test Item.
17. At Select Test Item, repeatedly press the > key until the display
reads Probe Bin Test.
18. At Probe Bin Test, press START. The display will change to [Start]
Ready?.
19. At [Start] Ready?, remove the empty sample tube from the freezing
chamber, pipette or measure a sample of probe bin setting fluid
into a clean sample tube, place the tube in the freezing chamber
and press the START key. The 3250 will run a special freezing point
test to determine the sample probe resistance and bin number.
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