60
The Advanced
®
Model 3250/4250 Service Manual
34. Printer fails to print.
35. “RAM Failure”
36. “Recalibration
Needed”
37. “Reset Probe
Configuration”
38. Results not repeatable
(too scattered).
39. “Result Over Range,
Try Higher Setting”
(3250 only)
40. “Result Under Range,
Try Lower Setting”
(3250 only)
41. “Sample Did Not
Freeze, Repeat Test”
Printer may be out of paper.
Paper feed mechanism may be jammed.
Printer may have failed.
Serial Suffix D and higher: Printer cover
may not be fully closed.
The main board has failed.
The calibration data has been lost from
memory. This is caused by:
a. battery back-up failure
b. installation of a new processor board
c. corruption of system memory
d. new probe bin numbers
The probe bin data has been lost from
memory. This is caused by:
a. battery back-up failure,
b. installation of a new processor
board,
c. corruption of system memory, or
d. new software/firmware.
1. Sample probe and stir wire are not
properly positioned.
2. Stir amplitude is too low or too high.
3. Freeze amplitude is too low or too
high.
4. Sample probe is damaged or defective.
The sample tested in the low range set-
ting was over the low range limit.
The sample tested in the high range set-
ting was under 1400 mOsm.
The sample did not freeze (after
“buzzing”).
Check paper. If out, install new paper.
Press FEED key while observing printer
paper feed mechanism. If either slow or no
paper feed is occurring, replace printer.
Serial Suffix D and higher: Make sure that
printer cover is fully closed. On some mod-
els, check diagnostic LEDs D19 and D20 on
PCB605.
Replace the processor board.
1. Recalibrate the instrument.
2. If error message persists after successful
calibration, replace the processor board.
1. Reset sample and block probe bin num-
bers.
2. If problem persists, replace processor
board.
1. Check sample probe and stir wire align-
ment and position.
2. Stir amplitude should be mixing sample
briskly, but without agitation or bubbles.
Check and adjust as needed.
3. Freeze amplitude should be just sufficient
to freeze sample. Too low and the sample
won’t freeze, too high and sample will be
thrown up on the side walls of the sample
tube. Check and adjust as needed.
4. Replace sample probe.
Retest the sample in the high range setting.
Retest the sample in the low range setting.
1. Make sure the sample tube is not empty,
and make sure the sample is not too vis-
cous.
2. Check the freeze amplitude.
3. Make sure the instrument is in the proper
range. (3250, only)
Symptom Explanation Suggested Action
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