40 Stat Fax 303 Plus Operator’s Manual Rev. J
Awareness Technology, Inc.
d. Check the tapes to be sure that no flags were printed that would indicate improper results.
(see section 2.4.4 for a review of flags and error messages.)
IF THE INSTRUMENT CONTINUES TO MALFUNCTION, CALL YOUR DEALER TO
ARRANGE FOR SERVICE.
Problem: The instrument lacks reproducibility.
Solution:
a. Check that the substance is not affected by the warming of the lamp. First, perform the
instrument CHECK OUT PROCEDURE in section 1.4.5 to ensure proper operation. If the
instrument is acceptable, insert a strip with water in all wells, read it several times, and observe
whether or not the “drifting” disappears. A strip of 12 wells of uniformly pipetted water, read in the
absorbance mode and blanked on the first well, should consistently provide results within ±
0.01A.
b. Very high absorbance readings are“noisier” than lower readings. Be sure you are operating
within the acceptable range of the instrument. For best results, make dilutions of very dark
samples before reading.
c. Perform the check out procedure to verify good repeatability when reading air.
Problem: The printing is dim or incomplete.
Solution: Use only the specified paper available from your dealer.
Problem: The normal operation of the instrument is suddenly interrupted.
Solution: As with all microprocessor-controlled devices, fluctuations and interruptions of the
power supply may cause the Microstrip Reader to fail. The keys may not respond to touch, and
the display may remain fixed. Turn the power switch off and wait for about 5 seconds. Then turn
it back on. The instrument will start up normally.
If this interruption to normal operation occurs with frequency, you should try plugging your
instrument into a different circuit. Choose a circuit that is free of large transient voltages such as
pumps, refrigerators, etc. If this is not possible, install a commercially available surge protector
(or noise filter).
Problem: The external printer fails to print.
Solution: Once you are certain that it is turned on, consult the printer manual for the correct dip
switch settings. Refer to sections 1.4.3 of this manual for more information about printer
requirements. If only one setting is wrong, the printer will either print nonsense characters or
nothing at all.
Support is available to help you solve any technical problem or question with this instrument.
Please call, fax, or write your dealer for immediate attention.
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