Service Manual

3.2.3 Nozzle arrays
In each of the BJ print heads, the nozzles are arranged in vertical rows at a pitch of
1/600-in.
In addition to the nozzles shown in Figure 4-19, all BJ print heads have
dummy nozzles at the top and bottom edges.
Also, the color head and photo head have 16 nozzles separating each
color, and designed to prevent neighboring colors mixing. The dummy
nozzles and color separation nozzles are not used for printing.
In the black head and ink optimizer head, up to 304 nozzles are used for
printing.
Nozzles 1 to 3 and 308 to 310 are for adjusting the print head alignment
(between the color head and photo head). According to the alignment
value, the 304 nozzles actually used in printing may shift up or down
within this range of 6 nozzles.
Because the black head and ink optimizer head, and the color head and
photo head, are arranged symmetrically around a center point, the nozzle
arrays are reversed.
For details of alignment, see Part 3, section 1.3.3, "Installing the BJ cartridge"
step 3) "Aligning the print heads" (page 3-5) .
4-21
BJC-7100
Part 4: Technical Reference
Nozzle 310
Nozzle 2
Nozzle 1
Black nozzleInk optimizer nozzle
Nozzle 240
Nozzle 161
Nozzle 160
Nozzle 81
Nozzle 80
Nozzle 2
Nozzle 1
Color nozzlePhoto nozzle
Nozzle 240
Nozzle 161
Nozzle 160
Nozzle 81
Nozzle 80
Nozzle 2
Nozzle 1
Color nozzle
BC-60
BC-61
BC-62e Photo
Print direction forword
Paper feed direction
(Direction in which carriage travels)
Cyan: 80 nozzles
Magenta: 80 nozzles
Yellow: 80 nozzles
Cyan: 80 nozzles
Magenta: 80 nozzles
Yellow: 80 nozzles
Figure 4-19 Nozzle Arrays