Ricoh G035 Service Manual page 217

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.
• SP2-6-1: LD Beam Pitch Adjustment – 400 dpi
• SP2-6-2: LD Beam Pitch Adjustment – 600 dpi
• SP2-6-3: LD Initial Setting – 400 dpi
• SP2-6-4: LD Initial Setting – 600 dpi
• SP2-12-1, no.12: IPU Test Pattern – Cross Stitch – 400 dpi
• SP2-12-1, no.13: IPU Test Pattern – Cross Stitch – 600 dpi
1. Do SP 2-6-5 Data Reset.
2. Input the value "144" into SP2-6-1.
3. Perform SP2-6-3.
4. Print the 400-dpi test pattern onto A3 (11" x 17 ") paper using SP2-12-1 no.12.
(See Service Tables - Test Pattern Printing).
5. Write the value of SP2-6-1 on the test pattern (in this case "144").
6. Change the value of SP2-6-1 and print another test pattern, repeating steps 2
to 4. Print about 5 patterns with different values for SP2-6-1 (e.g. "48", "96",
"192", "240").
7. Check these test patterns. If the laser beam pitch is not correct, the image
looks like a black vertical strip pattern.
NOTE: As an example, if the pattern made with the value "192" has less
obvious strips than the other print outs, the correct value is near "192".
8. Adjust the laser beam pitch position until the thin lines are of uniform thickness
(no striping effect should appear on the printout), doing steps 2, 3, and 4. In
step 2, input a correctly estimated value, then do steps 3 and 4. Then, if
necessary, go back to step 2 and try another value.
9. 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). When starting the adjustment for 600 dpi, input a value for SP2-6-2
between 24 and 48 higher than the final result for 400 dpi.
G035R512.WMF
Adjustment not complete
SM
Feed Direction
6-5
Feed Direction
G035R513.WMF
Adjustment complete
LASER UNIT
G035