The Advanced
®
Model 3250/4250 Service Manual
56
1. Abrupt loss of power
(no display)
2. “A/D Init Failure”
“A/D High Filter Error”
“A/D Low Filter Error”
“A/D Cal Mode Error”
3. “Baudrate Error”
4. “Block Probe Failure”
5. "Block Probe Open?"
6. Buzz Point Default Set
7. “Calibration Cancelled”
8. “Calibration Out of
Range; Repeat”
Interrupted power connection or loss of
power.
One or both A/D converters lost initial-
ization.
The baudrate setting is out of range.
The block probe has failed (usually
shorted).
The block probe resistance is greater
than A/D converter can measure.
The freezing point setting was outside
the allowed range.
The default setting has been automati-
cally set.
The STOP button was pressed during
calibration.
The range of the samples tested did not
repeat well enough for calibration.
1. Make sure the power cord is firmly
plugged into both the wall outlet and the
socket on the back of the instrument.
2. Temporarily unplug the power cord from
its wall outlet and replace it with a known
workable lamp or small appliance. Have
the power restored.
3. Measure the AC voltage supplied at the
power outlet used for this instrument.
4. Unplug the power cord from the power
cord socket. Visually check the fuses for a
blown fuse. If there is any doubt, test the
fuses with a continuity checker or ohm-
meter or simply replace them.
5. Check the values marked on the fuses.
6. Replace blown or incorrect-value fuses
with time delay (T) fuses. Refer to instru-
ment serial number label for proper fuse
value.
7. If a fuse was blown and a replacement
fuse blows too, contact our product serv-
ice department for assistance.
1. Turn power off and on.
2. If problem persists, replace application
board.
Reset baudrate in SETUP menu.
Check the block probe resistance (2,300
ohms ±300 at room temp.)
1. Is the probe plugged in?
2. Check the block probe resistance (2,300
ohms ±300 at room temp.)
1. For the 3250, use SETUP menu to
change, if desired.
2. For the 4250, this is a fixed value.
Calibration cancelled.
1. Recalibrate the instrument.
2. Check freeze pulse.
3. Check sample size and quality.
4. Check probe alignment.
Troubleshooting Table
Symptom Explanation Suggested Action
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