Laser Unit Alignment Adjustment - Ricoh B121 Service Manual

3.5.6 LASER UNIT ALIGNMENT ADJUSTMENT


WARNING
Reinstall the copy exit tray before turning the main switch on. The laser
beam may exit the copier chassis when the copy exit tray is not installed.
The laser beam can seriously damage your eyes.
1. Start the SP mode.
2. Select SP5-902-1 and output the "Trimming Area" pattern (pattern 10).
3. Check that the four corners of the pattern make right angles:
• If they make right angles, you do not need to adjust the laser unit alignment.
• If they do not make right angles, go on to the next step.
4. Check the screw position on the lever
[A].
• If the screw is in the hole [C], go on to
the next step.
• If the screw is in the slot [D], loosen
the screw on the lever, loosen the four
screws on the laser unit, and go on to
step 9.
NOTE: The initial position of the screw
is in hole [C].
5. Four screws in the laser unit (
6. Remove the lever ( x 1), confirm the
position of the hole beneath the slot [D], and reinstall the lever.
7. Install the screw (through the slot [D]) loosely into the hole beneath the slot (do
not tighten the screw).
8. Install the four screws for the laser unit loosely (do not tighten the screws).
9. When you rotate the lever clockwise
or counterclockwise by one notch of
the lever, the corners of the pattern
shift by ±0.4 mm (from the leading
and trailing edges). See the trim
pattern made in step 2, and find how
much the corners should be shifted.
10. Tighten the screw [A].
11. Tighten the screws on the laser unit.
12. Reinstall the copy tray.
13. Print the trim pattern and check the
result. If further adjustment is required, repeat this procedure.
SM
3.5.3)
3-21
LASER UNIT
[A]
[B]
[D]
[C]
B121R967.WMF
B121R968.WMF
B121 Series/B259 Series