B245/B276/B277/B268/B269 Service Manual 18-Jan-06
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Laser Unit
1. Do not loosen or adjust the screws securing the LD drive board on the LD
unit. This will put the LD unit out of adjustment.
2. Do not adjust the variable resistors on the LD unit. These are adjusted at the
factory.
3. The polygonal mirror and F-theta lens are very sensitive to dust.
4. Do not touch the toner shield glass or the surface of the polygonal mirror
with bare hands.
Fusing Unit
1. After installing the fusing thermistor, make sure that it is in contact with the
hot roller and that the roller can rotate freely.
2. Be careful to avoid damage to the hot roller stripper pawls and their tension
springs.
3. Do not touch the fusing lamp and rollers with bare hands.
4. Make sure that the fusing lamp is positioned correctly and that it does not
touch the inner surface of the hot roller.
Paper Feed
1. Do not touch the surface of the paper feed rollers.
2. To avoid misfeeds, the side and end fences in each paper tray must be
positioned correctly so as to align with the actual paper size.
You must run SP 2214 to initialize the TD sensor after you install a new PCU. After
starting initialization, be sure to wait for it to reach completion (wait for the motor to
stop) before you re-open the front cover or turn off the main switch.
If the optional tray heater or optics anti-condensation heater is installed, keep the
machine's power cord plugged in even while the main switch is off, to keep the
heater(s) energized.
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