GE MAC 600 SPY, Service Manual

Page: 35 / 127

Revision G MAC
TM
600 3-11
2047426-002
Troubleshooting: General Fault Isolation
Writer Test
1. From the Diagnostics menu , select Writer Tests .
The following window opens.
2. Perform the 50mm/s Speed Test.
a. Select the 50mm/s Speed Test button. The writer prints the 50
mm/s speed test report.
b. Examine the printed report. Use the following criteria to
determine if the writer passed or failed the 50mm/s speed test.

Count the number of subdivisions printed in a 20mm grid.

If the count is between 19-21, the test has passed.
NOTE
We recommend that you use a wider grid such as 50mm for
more accurate readings. For a 50mm span, the expected
result is a count of 45-55.
3. Repeat step 2 for the 25mm/s and 5mm/s speed tests. The pass-fail
criteria for each of the remaining tests are the same as indicated
above.
4. Perform the Roller Test .
a. Check that the test pattern printing is consistent. A white or
black line across the pattern indicates a defective or missing
print head dot. Replace the thermal printer assembly. See
“Replacing the Thermal Printer” on page 4-6 .
5. Perform the Continuously Run Out Paper Test .
This test continuously rolls out the paper. It also shows the number
of pages ejected if the unit is set in Z-fold paper mode.
If the number of pages does not increase while in Z-fold paper mode,
and if you run out of paper, there is a problem with the Thermal
Printer Cue sensor or the paper is not placed correctly. Check the
paper placement, if the problem persists replace thermal printer
assembly. See
“Replacing the Thermal Printer” on page 4-6 .
6. Select Main menu and press Enter to return to System Diagnostics.