Table of Contents
Advertisement
Revision L
Troubleshooting: Diagnostic Tests
50 mm/s Test Pattern I, 25 mm/s Test Pattern I, and 5 mm/s Test Pattern I. Test
patterns are used to check the paper speed control. Run each test pattern and
check for the following:
The length of the printout from start to finish measures 250 mm ± 5 mm.
Use the grids located on the top and bottom of the page for reference. If the
printout is outside of range, paper speed is too fast or too slow. Replace
thermal writer assembly. See
Replacement"
on page 5-33 .
Check that the long diagonal lines across the test pattern are straight. If
lines are wavy or curved, the paper speed is not constant or the roller is out
of round, replace thermal writer assembly. See
Assembly Replacement"
Check that the test pattern printing is consistent. A white or black line
across the pattern indicates a defective or missing print head dot. See
"Printhead Assembly Replacement"
Roller Test. During the check, perform the following general checks:
After cueing, printing should start at approximately 13-14 mm on the page.
The pattern will appear as diagonal light and dark wavy bands.
Isolated light spots indicate a flat spot on the roller.
A white line across the length of the page indicates a missing print head
dot.
Dark lines across the width of the page indicate gear tolerance problems.
Lines too close together at the start of the test indicate an incorrect start-up
speed.
NOTE
Uneven darkness can appear if AC power is on during this test.
Test Pattern II. This test is not needed. It is a combination of Test Pattern I and
Roller Tests. The first three pages consist of a series of triangular waveforms
and various hashmarks. The fourth page is a partial Roller Test.
Test Pattern II Continuous. This test is not needed. Test Pattern II runs
continuously until stop is pressed.
Continuously Run Out Paper. This test is for manufacturing use only. It tests
how well the unit self-corrects tracking problems.
MAC™ 3500 Resting ECG Analysis System
2021337-036
"Writer Roller/Carriage Assembly
"Writer Roller/Carriage
on page 5-33 .
on page 5-18 .
4-15
Advertisement
Table of Contents
