Welch Allyn ELI 150, Руководство по обслуживанию

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Section 6
6-7
Description of printout
At the top of the writer test print out will be the printable characters of the writer.
The next section will have a 200-mm line. This line should be measured with a ruler and will indicate if there is a
writer motor problem if the line is too short or too long. The tolerance of this line is +/- 2-mm.
The next line that prints is an indication of the cue sensor. At the beginning of the printout there should be a dip
towards the bottom off the page and then it should move to a baseline level. When the cue mark is sensed for the
second page of the printout a second dip is printed.
Note: there will be fluctuation in this line, this is normal. Look
for extreme variations that can indicate possible problems with the cue sensor or cue sensor circuitry.
The next line that prints is a zigzag line. Check to see that none of the dots are missing.
At the bottom of the page, starting in the lower left and continuing to the top of the page, two diagonal lines will be
printed. Check these lines for any missing dots. If dots are missing the print head may need to be cleaned or
replaced. Also check the lines for any “steps” which can indicate a motor problem.
Another item that is printed is a circle. Check the circle to make sure that there are no breaks or gaps in the printing.
This can indicate a problem with the writer motor and the thermal print head.
Near the end of the first page and continuing onto the second page will be two diagonal lines. Check these lines to
see if there are gaps. If there are gaps sections of the print head may be burned out. If this is the case the print head
should be replaced.
When printing an ECG at different paper speeds the calibration pulse printed at the beginning of each trace can be
used to check the paper speed. Check the calibration pulse by measuring the width and amplitude of the pulse at the
beginning of each line of ECG tracing. Use the following table for the correct measurements.
Note: The measurements should be made using a ruler and not the grid on the paper.
Paper Speed Cal Pulse Width
5mm/sec 1mm
10mm/sec 2mm
25mm/sec 5mm
50mm/sec 10mm
Gain Setting Cal Pulse Amplitude
5mm/mV 5mm
10mm/mV 10mm
20mm/mV 20mm