Canon W6200 Service Manual page 115

Part 4: Technical Reference
1.3.2 Print drive timing
Each printhead has six nozzle arrays (Bk, PC, C, PM, M, Y). These six arrays all use
the data transfer clock (HSCLK) and data latch pulse (LTH) signals.
The even nozzle data (E_DTBK1, DTBK2, DTLC1, DTLC2, DTC1, DTC2, DTLM1,
DTLM2, DTM1, DTM2, DTY1, DTY2), odd nozzle data (O_DTBK1, DTBK2, DTLC1,
DTLC2, DTC1, DTC2, DTLM1, DTLM2, DTM1, DTM2, DTY1, DTY2), heat enable
signals (HE_BK, LC, C, LM, M, Y), and subheat enable signals (SHE_BK, LC, C, LM,
M, Y) are sent to a specific array as required to control each array separately.
Printing is performed in both the carriage forward and reverse directions.
The encoder sensor installed on the carriage generates 300-dpi pitch linear scale
detection signals (CRENCA) and 90°-phase shift signals (CRENCB). The carriage
recognizes the movement direction by the state of the CRENCB signals with respect to
the rising of the CRENCA signals.
The printhead is driven using the 1200-dpi timing signals (XCOL-STR) that divide the
CRENCA signals detected by the 300-dpi timing into four equal parts.
Forward printing is based on the rising of the detection signals (CRENCA).
Reverse printing is based on the falling of the detection signals (CRENCA) and is
performed in the same manner as forward printing, except that the transmission
order of the even nozzle data and odd nozzle data reverses the heating order of the
printhead nozzles.
HSCLK
O_DTBK1
Data of block 0
O_DTBK2
Data of block 0
E_DTBK1
Data of block 0
E_DTBK2
Data of block 0
LTH
HE_BK
Low active
SHE_BK
Low active
Figure 4-4 Example of Print Drive Timing (Nozzle Array Bk in Forward Printing)
300dpi
Linear scale
CRENCA
CRENCB
1200dpi
XCOL-STR
Data of block 2 Data of block 4
Data of block 2 Data of block 4
Data of block 2 Data of block 4
Data of block 2 Data of block 4
4-6
1200dpi
Data of block 20 Data of block 22
Data of block 20 Data of block 22
Data of block 20 Data of block 22
Data of block 20 Data of block 22
W6200