18
when measured from its terminals.
4.36 NON-FUNCTIONING KEY(S)
Check the front panel keyboard for visible signs of
damage (punctures, dents, etc.). Check that
keyboard tail with connector is properly inserted into
the display board.
If a particular function does not work (example: no
kilogram units) check if that particular function is
turned off in the “SET-UP” mode (see section 2.40)
REMEMBER: Some hospitals have specified that
the scale weigh in kilograms ONLY-- this should not
be modified or changed.
4.37 ERROR MESSAGE DISPLAYED:
“E-FAIL” OR “r-FAIL”
This indicates a failure of the internal
mircocomputer’s memory during the start-up self-test.
“E-FAIL” indicates a failure of the microcomputer’s
EPROM memory during the checksum test. “r-FAIL”
shows a failure of the random access memory. Both
conditions require replacement of the microcomputer.
4.40 CALIBRATION
Your scale has been carefully calibrated at the
factory. This calibration involves matching and tuning
of the load cells and readout electronics. Since there
are no moving parts in the weighing mechanism there
should never be a need to recalibrate the scale.
Errors are typically caused by external interference or
forces. We suggest that the scale calibration be
checked annually. Only use calibrated, certified scale
test weights for this purpose. Traction or physical
therapy weights are NOT ACCEPTABLE SINCE
THEIR ACTUAL WEIGHT CAN OFTEN BE IN
ERROR AS MUCH AS +/-10%. Calibration weights
may be purchased from SCALE-TRONIX® or a local
scale dealer. An alternative to calibration weights is
the weight comparison method. This requires a
known accurate, calibrated scale. A fixed weight is
“weighed” on the calibrated scale; then the same
weight is placed on the scale for comparison.
PRECISION TEST CALIBRATION WEIGHTS ARE
AVAILABLE FROM SCALE-TRONIX®.
TWO (2) 10 KILOGRAM TEST WEIGHTS ARE
RECOMMENDED.
ORDER PART NO. 390025 / 20022: 10 kilogram
test weight (1)
If only “pound” test weights are available, conversion
is as follows:
1.0 Pound = 0.454 Kilograms
5.0 Pounds = 2.268 Kilograms
10.0 Pounds = 4.536 Kilograms
20.0 Pounds = 9.072 Kilograms
25.0 Pounds = 11.34 Kilograms
Large changes in calibration often indicate a
damaged load cell or faulty readout component. It is
generally recommended that if calibration is
necessary for your scale that it should be returned to
the factory. Calibration procedure follows for those
situations where this is not desirable. Calibration
should not be attempted by those not having the
proper tools or knowledge of electronic systems and
their attendant shock hazards.
4.41 PREPARING FOR CALIBRATION
Unplug the scale from the AC line. Unplug the cradle
from the scale. Detach the top cover of the scale’s
enclosure by removing the eight (8) #10 button head
screws. The scale’s instrument board should now be
in full view. Note the location of the trimmer
potentiometer, “P1 Span”.
4.42 ENTERING THE CALIBRATION MODE
Enter the “calibration mode” by following exactly the
procedure outlined below:
1. Be sure scale is off.
2. Press and hold in the “REWEIGH”
pushbutton.
3. While pressing the “REWEIGH” pushbutton,
press and release the “ON / (OFF) / ZERO”
pushbutton.
4. NOTE: The “Print/Send/Data” pushbutton is
a special hidden programming and test
pushbutton located to the right of the front
panel “RECALL PRIOR WEIGHT”
pushbutton. After the scale displays the test
pattern of “888888” release the “REWEIGH”
button and press the “Print/Send/Data”
pushbutton five (5) times. This will cause the
readout to enter the calibration mode. The
display will indicate “CAL”.
5. Press the “Print/Send/Data” pushbutton
once more; the display will indicate “A-d”.
This indicates the start of the “raw”
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