Brother HL-4000CN Service Manual page 20

3. Trim Activity
Trim activities for HL-4000CN should be made within every SM/UM, mainly for
maintaining the machine performance. There is no service call performed only for the
trim activity.
3.1 Trim activity procedure
1. Check the overall operation before performing the trim activity.
Print any Internal Test Pattern to output three patterns: all colors of 20 % each,
halftone and grid.
All colors of 20 % each: IBT belt, scratches on the drum surface, and fusing
Halftone pattern: Low density area reproduction problem, color balance and fusing
Grid pattern: Color registration problem and fusing problem are checked.
* See page V-51 for test pattern output method.
2. Clean the interior of the machine.
Clean toner contamination and paper dust in the paper path area.
(Operator area should be cleaned carefully.)
3. Check the periodic replacement parts(consumable parts). Replace as required.
4. Safety check.
Check the Power Cord for damage or loose connection.
5. After 1 to 4 above completes, do the following overall operation checks.
Machine operation
Print quality
Meter reading
3.2 Mechanical consumables and periodic replacement parts
A mechanical consumable should be replaced after checking the printed sheets
count during trim action.
<Mechanical consumables>
Consumable
Black Toner Cartridge
Cyan Toner Cartridge
Magenta Toner Cartridge
Yellow Toner Cartridge
Print Head Cartridge
Transfer Roll Cartridge
(with Toner Collector Bottle)
*1: Condition
Paper size: A4 or LETTER
Toner coverage: 5%
Ratio of B/W to color: 1: 1
Average number of sheets printed at onetime: 4 sheets
<Parts for periodic replacement>
Consumable
Fuser Unit
Retard Roll
problem are checked.
problem are checked.
Product Code
TN-11BK
TN-11C
TN-11M
TN-11Y
PH-11CL
TR-11CL
Replacement interval
100K prints
100K prints
xi
Number of sheets that can be
printed*1
8.5K
6K
6K
6K
30K
25K
Remarks