Laser Beam Pitch Adjustment - Ricoh B003 Service Manual

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
SP2-109-1:
SP2-109-2:
SP2-109-3:
SP2-109-4:
1. Set SP2-110 to 0 (for 400 dpi).
2. Do SP 2-109-8.
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. Perform 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 4. 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. Do steps 2, 3, and 4 to adjust the laser beam pitch position until thin lines are of
uniform thickness (no stripes should appear on the printout).
NOTE: In step 2, input a value estimated to be correct, then do steps 3 and 4,
then if necessary go back to step 1 and try another value.
10. After adjusting the laser beam pitch for 400 dpi, adjust the laser beam pitch 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.
A284R512.BMP
Adjustment not complete
SM
CÓPIA NÃO CONTROLADA
Test Mode Dpi (0: 400 dpi, 8: 600 dpi)
LD Beam Pitch Adjustment – 400 dpi
LD Beam Pitch Adjustment – 600 dpi
LD Initial Setting – 400 dpi
LD Initial Setting – 600 dpi
Adjustment complete
3-25
CÓPIA NÃO CONTROLADA
A284R513.WMF
B003/B004/B006/B007
LASER UNIT