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Example: The ZERO offset value is “11.7” (representing 11.7 pounds). Adding the specified three 25-kilogram test
weights (equivalent to 165.3 pounds) to the platform produces a reading of “177.1” The difference is 177.1-
11.7=165.4 (equivalent to 165.4 pounds). This would indicate the calibration is 0.1 pound “high”.
Using the specified three 25-kilogram test weights, a difference of 165.3 +/-0.1 pound should be obtained. If
necessary, adjust potentiometer P1 (span adj.) on the instrument board until the correct value is obtained. Remove
the test weight and recheck the ZERO offset value. Note that adjusting P1 may also alter the ZERO offset value.
Repeat the process as necessary to obtain the correct difference.
Now you may turn the scale off by pressing the “ON” pushbutton and holding it in for a few seconds. That will force
it to turn off. You may also wait for it to time out and turn off by itself.
DATA OUTPUT (RS232) DETAILS
For detailed help and information regarding the data output capabilities, contact Welch Allyn. RS232 data output
has been made a standard feature on many of our scales in 2013. Existing scales can be easily modified to provide
data output when needed. Consult Welch Allyn for details.
Troubleshooting of Scale
The internal microcomputer contained in the readout constantly monitors the scale’s operation and uses the display
to indicate error conditions when they arise. An explanation of these messages is given below:
“bAttrY”: Indicates the battery has become depleted to the point that it can no longer operate the scale.
Replace the battery to continue operation.
“O-LOAd”: Shows that the scale platform’s weighing capacity has been exceeded. Refer to the inside front
cover specifications for maximum capacity.
“CAbLE”: Displays that the transducer signal is well in excess of its maximum value. This is usually caused
by the transducer cable being disconnected. Check the cable connection between the display and the
weighing platform.
“OFF SCALE, PLEASE –“ : Remove the weight from the weighing platform and allow the scale to obtain
“ZERO”.
“E-FAIL”, “r-FAIL”: Shows that a memory failure has occurred in the internal microcomputer’s memory.
Requires service of the scale.
The following simplified trouble shooting procedures are recommended for identifying defective system
components. Certain corrective measures are provided. More complicated servicing should only be performed by
the factory or authorized service facilities. Most problems can be solved over the telephone. Problems requiring
factory service are usually handled quickly and the scale is on its way back. Call first to discuss the problem.
WEIGHT READING NOT ACCURATE
This can commonly be caused by a mechanical obstruction of the weighing platform. Check that the platform is not
touching some foreign object so that it is restricted in its’ downward movement. Also check that the connecting
cable is firmly plugged into the instrument circuit board (marked “J4 LOAD CELL”).
WEIGHT READING TAKES EXCESSIVE TIME TO DISPLAY
If the platform is in motion, the scale will wait for it to settle before displaying the weight. This can be caused by
excessive patient motion.
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