Ricoh G176, Service Manual

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Laser Unit
G176/G177/G176L 3-10 SM
3.4.5 LASER DIODE UNIT
ƒ Laser Unit (See "Laser Unit")
[A] Spring
[B] LD unit holders (x 2)
[C] Loosen the screw
[D] Nut
[E] LD Unit
ƒ
Do not remove the screws that secure the LD board.
ƒ Do not touch any variable resistors on the LD board.
Reinstallation:
ƒ Tighten the screw [C] until the unpainted portion of the screw is not visible.
ƒ After installing the LD unit, check the test pattern for the final adjustment (see the
following procedure).
3.4.6 LASER BEAM PITCH ADJUSTMENT
1. Print out the following test patterns – cross-stitch pattern and two-dot argyle pattern.
ƒ Select the test pattern with SP 2902.
ƒ After selecting a pattern, the display automatically goes to SP 5902. Use SP
5902-1 to print one test pattern.
ƒ After completing the adjustment, reset SP 2902 to ‘no specified’.