g. At “Stir/Freeze Test”, press START. The display will change
to “[stir] [freeze]”.
h. At “[stir] [freeze]”, a freeze pulse will occur each time the >
button is pressed. Watch the tip of the stir/freeze wire and press
>. The freeze-pulse vibration should produce a loud “buzz”. If
properly adjusted as recommended in section 5, the stir/freeze
wire should vibrate principally fore and aft and should never
strike the probe.
i. Manually move the operating head to a position slightly for-
ward of the probe wipers, such that the stir/freeze wire vibration
will be unimpeded by the wipers and clearly visible in front of
the probe.
Watch the stir/freeze wire vibrate as you press > again. The
freeze-pulse vibration blur at the very tip of the stir/freeze wire
should span at least 1/2” or 13 mm for one second, then cease.
If the freeze vibration is inadequate, do not proceed further but
refer the problem to a qualified service person with a 4C3 ser-
vice manual or telephone for Hot-Line® service as recommend-
ed in Chapter 5, Section C.
If the freeze vibration is adequate, check and adjust the stir
vibration amplitude as follows:
73
Troubleshooting & Service
Figure 11: Probe and Stir/Freeze Wire Alignment
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