19 January, 2001 LASER UNIT
1-25
Replacement
Adjustment
Laser beam pitch adjustment
After replacing the LD board, perform the laser beam pitch adjustment. There are
two laser beam pitch adjustment procedures: one for 400 dpi, and one for 600 dpi.
These adjustments use the following SP modes.
SP2-110 Test Mode Dpi (0: 400 dpi, 8: 600 dpi)
SP2-109-1: LD Beam Pitch Adjustment – 400 dpi
SP2-109-2: LD Beam Pitch Adjustment – 600 dpi
SP2-109-3: LD Initial Setting – 400 dpi
SP2-109-4: LD Initial Setting – 600 dpi
1. Set SP2-110 to 0 (for 400 dpi), or to 8 (for 600 dpi).
2. Do SP 2-109-8 to reset all the beam pitch data.
3. For SP2-109-1 input 144.
NOTE: The entry “144” is only a starting reference value that will allow the
machine to operate. It is only a starting point for adjustment.
4. Do SP2-109-3.
5. Print the test pattern onto A3 (11" x 17") paper using SP2-902-3 no.15. (☛
Section 5 Service Tables, 5.1.2 Test Pattern Printing (SP2-902).
6. On the test pattern write 144, the value of SP2-109-1.
7. Change the value of SP2-109-1 and then print another test pattern, repeating
steps 2 to 6. Print about 5 patterns with different values for SP2-109-1 (e.g. 48,
96, 192, 240).
8. Check these test patterns. If the laser beam pitch is not correct, the image
looks like a black vertical stripe pattern.
NOTE: For example, if the pattern made with the value 192 has fewer obvious
stripes than the other printouts, the correct value is near 192.
9. Fine adjustment: Do steps 2 to 6 to adjust the laser beam pitch position until
thin lines are of uniform thickness (no stripes should appear on the printout).
NOTE: In step 3, input a value estimated to be correct (e.g., if 192 was the
closest, try 182), then do steps 4 and 5, then if necessary go back to
step 2 and try another value.
10. After adjusting the laser beam pitch for 400 dpi, adjust it for 600 dpi, using the
same procedure as for 400 dpi (use the SP modes for 600 dpi). Laser beam
pitch for 600 dpi should be 24~48 more than for 400 dpi.
B004R552.WMF
B004R553.WMF
Adjustment not complete
Adjustment complete
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