Chapter 2
2-4
2. Print drive timing
Each printhead houses 12 trains of nozzles, which share the same data transfer clock (Hx-CLK) and data latch pulses (Hx-LT).
Even-numbered nozzle data (Hx-x-DATA-x-EV), odd-numbered nozzle data (Hx-x-DATA-x-OD) and the Heat Enable (Hx-x-HE-x) signal are generated for each
nozzle train and controlled individually.
Printing is carried out in two ways through reciprocating motion of the carriage.
An encoder sensor mounted on the carriage generates a 150-dpi-pitched linear scale detection signal (ENCODER_A) and a signal (ENCODER_B) shifted 120 de-
grees in phase. The direction of carriage motion is detected from the status of the ENCODER_B signal relative to the leading edge of the ENCODER_A signal.
The printhead is driven using a 2400-dpi timing signal (internal signal), which is generated by dividing the ENCODER_A signal detected at the 150 dpi timing into
16 equal sections.
Printing in the forward direction is triggered at the leading edge of the detection signal (ENCODER_A).
Printing in the backward direction is carried out the same way as printing in the forward direction but at the trailing edge of the detection signal (ENCODER_A),
when the order of heated nozzles is reversed depending on the sequence of transfer of even-numbered nozzle data and odd-numbered nozzle data.
F-2-4
150dpi
2400dpi
Internal signal
2400dpi
Low active
Linear scale
Data of block 0
Data of block 0
Data of block 0
Data of block 0
Data of block 2
Data of block 2
Data of block 2
Data of block 2
Data of block 4
Data of block 4
Data of block 4
Data of block 4
Data of block 22
Data of block 22
Data of block 22
Data of block 22
ENCODER_A
ENCODER_B
H0_CLK
H0_A_DATA_0_EV
H0_A_DATA_1_EV
H0_LT
H0_A_HE_1
H0_A_DATA_0_OD
H0_A_DATA_1_OD
Summary of Contents for iPF825
Page 2: ......
Page 6: ......
Page 11: ...Chapter 1 PRODUCT DESCRIPTION...
Page 12: ......
Page 14: ......
Page 67: ...Chapter 2 TECHNICAL REFERENCE...
Page 68: ......
Page 78: ...Chapter 2 2 8 Printing Modes...
Page 79: ...Chapter 2 2 9...
Page 121: ...Chapter 3 INSTALLATION...
Page 122: ......
Page 124: ......
Page 138: ...Chapter 3 3 14...
Page 139: ...Chapter 4 DISASSEMBLY REASSEMBLY...
Page 140: ......
Page 142: ......
Page 200: ......
Page 201: ...Chapter 5 MAINTENANCE...
Page 202: ......
Page 204: ......
Page 208: ...Chapter 5 5 4 5 Close upper cover 1 F 5 6 1...
Page 209: ...Chapter 5 5 5...
Page 210: ......
Page 211: ...Chapter 6 TROUBLESHOOTING...
Page 212: ......
Page 214: ......
Page 241: ...Chapter 7 SERVICE MODE...
Page 242: ......
Page 244: ......
Page 265: ...Chapter 7 7 21...
Page 266: ......
Page 267: ...Chapter 8 ERROR CODE...
Page 268: ......
Page 270: ......
Page 305: ...Appendix...
Page 306: ......
Page 314: ......
Page 315: ...Feb 27 2017...
Page 316: ......