Canon BJC-55 Service Bulletin page 134

Part 4: Technical Reference
b) Nozzle arrangement
The bubble jet nozzles are arranged in a vertical line at intervals of 1/360 inch.
BC-11e
c) Signal contact part
The signal contact part of the bubble jet head contacts the carriage contact part to
transfer control signals including print signal, to the bubble jet nozzles.
Nozzle 136
Black
Nozzles 73 ~ 136
Cyan
Nozzles 49 ~ 72
Magenta
Nozzles 25 ~ 48
Yellow
Nozzles 1 ~ 24
Nozzle 1
Figure 4-17 Nozzle Arrangement
3 15 27
10 11 19 20
9 12 18 21 26
2 6 8 13 17 22 25
1 5 7 14 16 23 24
Figure 4-18 Contact Part
4-24
BC-10
29
28
BJC-50
Nozzle 128
Nozzle 1