Model 3440-L F–13
F. MAINTENANCE
RS-232 PORT DOES NOT FUNCTION CORRECTLY
Check for proper baud rate.
Check printer.
Check cable and connectors.
Check CPU jumper configuration and cable pins 2 and 3. Also,
possible CPU Board malfunction.
COUNTS ARE SATISFACTORY, BUT RESULTS ARE IN ERROR
Ensure the measurement depth corresponds to the actual source rod
depth.
Check the calibration constants.
Check to see if an offset (density, moisture, trench, or special) is
enabled.
Ensure the standard counts are correct.
GARBAGE OR “+++++” IS DISPLAYED
Check the standard counts in memory. If the standard counts are
suspect, perform new standard counts. If counts equal zero for both
systems, replace high voltage board (contact the Service Department).
Check gauge for water damage. If the gauge is wet, dry the gauge
interior with hair dryer (on low heat) for 3 hours.
Check the calibration constants. They should match the constants on
your calibration data sheet if your calibration sheet is in metric units.
Refer to the Calibration Constants section on page 7–6 to determine if
your calibration sheet is metric and, if not, for instructions on
converting B and F values from metric to English units.
If necessary, perform a statistical stability test, record the results and
call Customer Service.
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