Brother HL-4200CN Service Manual page 20

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-54 for the test pattern output method.
No. Work item
1.1 Check before work
(Mechanical noise
check)
1.2 Check before work
(Test pattern output)
2 Cleaning inside the
machine
(Paper transport
system cleaning)
Retard Roll
3.1 Fuser ASSY
3.2 Print Head Cartridge
3.3 Transfer Roll
Cartridge Unit ASSY
4 Safety check
5.1 Check after work
(Print quality check)
5.2 Check after work
(Machine operation
check)
5.3 Check after work
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.)
Each 100K Rep &
time Adj
No.
C
C
C R
A R
A 30K
C 18K
A
C
C
C
CAUTION
xii
Description
- Start up the machine to see that no
abnormal noise occurs
- 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.)
- 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.
- Check that the H. Roll and P. Roll are not
scratched.
Replace them when necessary.
- Visual check only. Do not touch.
- Visual check only. Do not touch.
- 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.
- Output the internal test patterns to see that
the print quality satisfies the standards.
- Check paper feed and noise.
- Create Machine Log Book and a service
report.