Laser Unit - Brother IntelliFax-3550 Service Manual

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,
Toner sensor PCB
Laser unit
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.
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
Glass
Mirror
IV – 15
Polygon motor flat
cable
Laser diode harness
Toner sensor harness
Sponge
Relay PCB