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Troubleshooting and Service
10. Head Up/Down Test
This test enables selectively lowering and raising the operating head. It
may be used to check the operation of the head motor drive, to prime
and drain the heat transfer fluid pump, and to check for obstructions in
the fluid system.
CAUTION To protect the sample probe, place a sample tube in the
freezing chamber before running this test.
1. On entry, [START] Test [STOP] is displayed. Press START to
continuously cycle the operating head down and up.
2. Press STOP to raise the operating head and exit to the test menu
3. Press STOP to exit from the test menu to Osmometer Ready (if the
initial diagnostics had not been completed when the test menu was
entered, the 3250 will complete them before Osmometer Ready is
displayed).
11. Event Record
This menu item displays the last 200 recordable events of the
instrument, and is used when servicing the instrument.
Fuse replacement
If you determine that your instrument is not functioning because of
blown fuses, you will need to replace the fuses using the following
procedure:
1. Switch the power switch to the off position and disconnect the
power cord.
2. Use a small flat-bladed screwdriver or similar tool to remove the
fuse holder door. Remove the fuse holder.
3. Double-check the values marked on the fuses. The Model 3250 will
automatically adjust for voltages between 100VAC and 240VAC,
but appropriately rated fuses (2) must be installed. Use 5 x 20 mm,
250V, time delay (Type T): 2-Amp.
4. Re-install the fuse holder into the back of the instrument.
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