Canon BJC-5000 Service Manual page 77

BJC-5000
even/odd enable signals (Even/Odd ENB). The heat enable signals (HENB 0, 1, 2, 3)
are the heat drive control signals for the heater boards.
In the drop modulation mode, the HENB0 signals drive the heater at the back of the
black nozzles; the HENB1 signals drive the heater in the front of the black nozzles;
the HENB2 signals drive the heater in the front of the color nozzles; and the HENB3
signals drive the heater at the back of the color nozzles.
The heat enable signals are comprised of a pre-pulse and main pulse. To achieve
optimum ink discharge constantly, internal conditions such as the head's rank,
printer temperature, and head temperature are monitored and the heater drive pulse
width is varied before the pulse is output.
HLATCH
0
HDATA
HCLOCK
Odd ENB
Even ENB
BENB 0
BENB 1
BENB 2
HENB 0,1,2
HENB 3
Odd ENB
Even ENB
BENB 0
BENB 1
BENB 2
HENB 0,1,2
HENB 3
The signals HENEB 0, 1, 2, and 3 are driven independently
when the multi-drop type color BJ cartridge is used.
The names of signals for the LEFT and RIGHT BJ cartridges are different.
LEFT BJ cartridge: HENB 0L, 1L, 2L, 3L
RIGHT BJ cartridge: HENB 0R, 1R, 2R, 3R
Standard 154 s (6.51kHz)
Graphics 154 s (6.51kHz)
High
100 s (10kHz)
128 or 136
1 2 3 4
1(0) 0(1) 1(0) 0(1)
1(0) 0(1)
1(0) 0(1)
1 Block
1(0) 0(1) 1(0) 0(1) 1(0) 0(1) 1(0)
1(0) 0(1) 1(0) 0(1)
1(0) 0(1)
1 Block
Figure 4-5 Print Signals
Data transfer to shift register
Head driving in high mode (divided into 16)
0(1)
Head driving in standard mode (divided into 8)
Variable Pulse
Width
4-5
Part 4: Technical Reference
Pre-Pulse
Main Pulse