Brother HL-4000CN, Service Manual

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3.3 Trim checklist
C: Check and if necessary clean, replace, or replenish.
A: Always check and clean.
R: Replace at specified intervals.
* See page V-51 for the test pattern output method.
No. Work item Each
time 100K Rep &
Adj No.
Description
1.1 Check before work
(Mechanical noise
check) C - Start up the machine to see that no
abnormal noise occurs
1.2 Check before work
(Test pattern output) C - Output the internal test patterns to check
the print quality.
(Check uneven darkness, deletion, and
drum of belt damage with each 20%
pattern and reproducibility of low darkness
with the document reproducibility pattern.)
2 Cleaning inside the
machine
(Paper transport
system cleaning)
Retard Roll C R - Clean any loose toner and paper dust from
the paper transport path and jam sensors.
- Clean especially the operator area.
- Check and clean the MSI field roll.
3.1 Fuser ASSY A R - Check that the H. Roll and P. Roll are not
scratched.
Replace them when necessary.
3.2 Print Head Cartridge A 30K - Visual check only. Do not touch.
3.3 Transfer Roll
Cartridge Unit ASSY
C 18K - Visual check only. Do not touch.
4 Safety check A - Check the power plug for loose connection.
- Check the power cable for crack or
explosion of its conductor.
- Check that the extension cable of an
insufficient capacity or a nonstandard
power cable (ex. table tap) is not used.
- Check that the power cable is not
connected to the same outlet as some
other cables.
5.1 Check after work
(Print quality check) C - Output the internal test patterns to see that
the print quality satisfies the standards.
5.2 Check after work
(Machine operation
check) C - Check paper feed and noise.
5.3 Check after work C - Create Machine Log Book and a service
report.
CAUTION
Do not touch the print head cartridge or transfer roll cartridge unit directly by hand.
Do not use a drum cleaner or other solvents. (It will take time for the machine to recover.)