Laser Unit - Ricoh Aficio MP2550B Service Manual

Do not disassemble the lens unit. Doing so will throw the lens and the copy image out
of focus.
Do not turn any of the CCD positioning screws. Doing so will throw the CCD out of
position.

3.2.4 LASER UNIT

Do not loosen the screws that secure the LD drive board to the laser diode casing.
Doing so will throw the LD unit out of adjustment.
Do not adjust the variable resistors on the LD unit, as they are adjusted in the factory.
The polygon mirror and F-theta mirror are very sensitive to dust.
Do not touch the glass surface of the polygon mirror motor unit with bare hands.
3.2.5 FUSING UNIT
After installing the fusing thermistor, make sure that it is in contact with the hot roller
and that the hot roller can rotate freely.
Be careful not to damage the edges of the hot roller strippers or their tension springs.
Do not touch the fusing lamp and rollers with bare hands.
Make sure that the fusing lamp is positioned correctly and that it does not touch the
inner surface of the hot roller.
3.2.6 PAPER FEED
Do not touch the surface of the paper feed roller.
To avoid paper misfeeds, the side fences and end fences of the paper tray must be
positioned correctly to align with the actual paper size.
3.2.7 OTHERS
The toner bottle should be replaced while the main switch is on.
If the optional tray, drum, and optics anti-condensation heaters have been installed,
keep the copier power cord plugged in, even when the copier main switch is turned off.
This keeps the heaters energized.
SM 3-3
General Cautions
D017/D018/D019/D020