Revision L MAC™ 3500 Resting ECG Analysis System 4-15
2021337-036
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
t
hermal writer assembly. See “Writer Roller/Carriage Asse
mbly
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 ou
t
of round, replace
thermal writer assembly. See
“Writer Roller/Carriage
Assembly Replacement” on page 5-33.
Check that the test pattern printing is consistent. A white or black line
acros
s the pattern indicates a defective or missing print head dot
. See
“Printhead Assembly Replacement” on page 5-18.
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
do
t.
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 waveform
s
and variou
s hashmarks. The fourth page is a partial Roller Test.
Test Pattern II Continuous. This test is not needed. Test Pattern II runs
cont
inuously 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.
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