GE MAC 3500 Service Manual page 47

After printing the three test patterns, verify the following:
• Each test pattern is 250 mm ± 5mm long from start to finish.
Use the grids located on the top and bottom of each page for reference. If the
printout is out of range, the paper speed is too fast or too slow. Replace the thermal
assembly. Refer to
• The long diagonal lines across the test pattern are straight.
If the lines are wavy or curved, the paper speed is not constant or the roller is out
of round. Replace the thermal writer assembly. Refer to
Roller/Carriage Assembly" on page
• The test pattern printing is consistent.
A white or black line across the pattern indicates a defective or missing printhead.
Replace the thermal printhead. Refer to
Roller Test
The Roller Test checks paper cueing, roller condition, and print head quality. It
generates an alternating pattern of light and dark wavy bands, as seen in the
following illustration.
2046275-019H
"Replacing the Writer Roller/Carriage Assembly" on page
100.
"Replacing the Printhead" on page
MAC™ 3500
Troubleshooting
100.
"Replacing the Writer
98.
47