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Troubleshooting
Introduction
Problems with the performance of the 3250/4250 are usually identified by the software and
displayed as error messages. The troubleshooting table on the following pages lists all error
messages, indicates why the software generated the message, and lists what may be causing
the problem.
Error messages may be caused by mistakes during testing, worn or defective parts, or parts
set to the wrong specifications. This section includes directions for:
• Checking and resetting the stir and freeze amplitude settings and the probe bin settings;
• Aligning the probe and stir-freeze wire, and adjusting the head sensors;
• Using the A/D test to check the block probe, sample probe, and cooling assembly.
Note Before you repair or replace any parts, turn the instrument off and then back on
after a short delay. This allows the software to reinitialize, and may correct what
appears to be a serious hardware problem.
CAUTION: Some troubleshooting requires the instrument to be turned on while the cover
is removed. Use extreme caution when operating the instrument without the
cover. Hazardous voltages are present at the AC input and circuit components
connected directly to the AC input. Refer to the system schematic for
additional information.
Freeze “Buzz” Amplitude
To check and reset the freeze amplitude setting:
1. Turn on the instrument. If there is a Supervisor/Operator keyswitch, turn it to the
Supervisor position (if required).
2. Press TEST.
3. Press < or > to select Stir/ Freeze Test, and then press START.
4. At [stir] [freeze], watch the tip of the stir/freeze wire and press >. The freeze vibration
should buzz loudly, and the vibration blur at the tip of the wire will last one second. The
amplitude should measure about 13mm (1/2”).
5. If the freeze amplitude is not within the correct range, follow steps 4-6 below.
6. Remove the head cover and clear away any metal chips between the coil frame and the
clapper [A].
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