Brother International IntelliFax-3550 Service Manual - Page 65

Laser Unit, Toner sensor, Glass, Mirror, Polygon motor flat, cable, Laser diode harness

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1.11 Laser Unit (1) Remove the three screws. (2) Slightly lift up the laser unit and disconnect the following three things from the relay PCB: • Laser diode harness (5-pin) • Polygon motor flat cable (5-pin) • Toner sensor harness (4-pin) NOTE: When handling the laser unit, take care not to touch the inside of the unit, glass, or mirror. On the small PCB at the right side of the laser unit is a 2-pin connector which is for the adjustment in the factory. Do not disturb it. Toner sensor Toner sensor PCB Glass Mirror Laser unit Polygon motor flat cable Laser diode harness Toner sensor harness Sponge Relay PCB s Reassembling Notes • Before putting the laser unit back into place, check for any toner particles, paper dust or dirt, and clean them out. • When installing the laser unit, make sure that the toner sensor harness is routed through the groove as shown above. • Make sure that the sponge is placed below the laser unit. IV - 15

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IV –
15
1.11
Laser Unit
(1)
Remove the three screws.
(2)
Slightly lift up the laser unit and disconnect the following three things from the relay
PCB:
•
Laser diode harness (5-pin)
•
Polygon motor flat cable (5-pin)
•
Toner sensor harness (4-pin)
NOTE:
When handling the laser unit, take care not to touch the inside of the unit,
glass, or mirror.
On the small PCB at the right side of the laser unit is a 2-pin connector which
is for the adjustment in the factory.
Do not disturb it.
Toner sensor
Toner sensor PCB
Glass
Mirror
Laser unit
Polygon motor flat
cable
Laser diode harness
Toner sensor harness
Sponge
Relay PCB
■
Reassembling Notes
•
Before putting the laser unit back into place, check for any toner particles, paper dust or
dirt, and clean them out.
•
When installing the laser unit, make sure that the toner sensor harness is routed through
the groove as shown above.
•
Make sure that the sponge is placed below the laser unit.