Ricoh AP4510 Service Manual download pdf (Page 82)

LASER UNIT

G065 3-14 SM

Laser Beam Pitch Adjustment

After replacing the LD board, do the laser beam pitch adjustment. There are two

procedures: one for 400 dpi, and one for 600 dpi. These use the following SPs.

SP2110 Test Mode Dpi (0: 400 dpi, 8: 600 dpi)

SP2109-01 LD Beam Pitch Adjustment – 400 dpi

SP2109-02 LD Beam Pitch Adjustment – 600 dpi

SP2109-03 LD Beam Pitch Adjustment – 400 dpi Initial Setting

SP2109-04 LD Beam Pitch Adjustment – 600 dpi Initial Setting

NOTE: If you do not have an SMC Report for reference, print the SMC Report so

you can look up and match the SP numbers below with the correct name.

1. Set SP2110 to 0 (for 400 dpi), or to 8 (for 600 dpi).

2. Execute SP2109-08 to reset all the beam pitch data.

3. For SP2109-01 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. Execute SP2109-03.

5. Print the test pattern onto A3 (11" x 17") paper using SP2902-03 no.15. (☛ 5

Service Tables, 5.1.2 Test Pattern Printing (SP2902).

6. On the test pattern write 144, the value of SP2109-01.

7. Change the value of SP2109-01 and then print another test pattern, repeating

steps 2 to 6. Print about 5 patterns with different values for SP2109-01 (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 (see the diagrams below).

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.

G065R553.WMFG065R552.WMF

Adjustment not complete

Adjustment complete

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Ricoh AP4510 Service Manual Page 82