EPSON Stylus CX3500/CX3600/CX3650/CX4500/CX4600 Revision A
OPERATING PRINCIPLES Electrical Circuit Operating Principles 74
2.4.2.2 Print Head Driver Circuit
The Print Head driver circuit consists of the following two components:
T Head common driver circuit (Common driver IC11 & Wave amplifier
transistor Q9, Q10)
T Nozzle selector IC on the Print Head driver
The common driver (IC11) generates a basic drive waveform according to the output
signals from CPU (IC8). The basic drive waveform is amplified by the transistors Q9
and Q10 (the amplified one is called drive waveform.) and then transferred to the
nozzle selector IC on the Print Head driver board. Print data is converted to serial data
by the CPU and then sent to the nozzle selector IC on the Print Head driver board.
Based on the serial data, the nozzle selector IC determines the nozzles to be actuated.
The selected nozzles are driven by the drive waveforms amplified by the transistor Q9
and Q10. Refer to Figure 2-19 (p.74) for the Print Head driver circuit block diagram.
V Head common driver circuit
The basic drive waveform is generated in the common driver (IC11) based on the
following 13 signal lines output from the CPU (IC8); DATA0-DATA9, LAT,
RESET, and PSCNT.
By the DATA signal output from the CPU, the original data for the basic drive
waveform is written in the memory in the common driver (IC11). The addresses
for the written data are determined by DATA0-DATA9 signals. Then, the
necessary data is selected from the address and appropriate basic drive waveform
is generated. Generated basic drive waveform is transferred to nozzle selector IC
on the Print Head driver board through the transistor Q9 and Q10 and applied to
the nozzle PZT specified by nozzle selector IC.
V Nozzle selector circuit
Printing data is allocated to the four rows (the number of the head nozzle rows)
and converted into serial data by the CPU (IC8). Then the converted data is
transferred to the nozzle selector IC through the four signals lines (HS01 to HS04).
Data transmission from the CPU to the nozzle selector synchronizes with the LAT
signal and SCK clock signal. Based on the transmitted data, appropriate nozzle is
selected and the PZTs of the selected nozzle are driven by the drive waveform
output from the head common driver.
Figure 2-19. Print Head Driver Circuit
CPU
(IC8)
Head Driver
(IC11)
Nozzle
Selector IC
+4.2V
Head
Drive
Pulse
CN6
CN5
HDAC_D0
HDAC_D1
HDAC_D2
HDAC_D3
HDAC_D4
HDAC_D5
HDAC_D6
HDAC_D7
HDAC_D8
HDAC_D9
HDAC_CLK
HDAC_RST
PS3
HCH
HSOCLK
HS03
HS04
HLAT
NCHG
HS01
HS02
AN1
VHV
COM
COM
CH
SCK
SI3_Ma
SI4_Cy
COM
COM
LAT
NCHG
SI1_Bk
SI2_Ye
XHOT/TMM
DATA0
DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
DATA8
DATA9
LAT
RESET
PSCNT
VCC2
OUT1
OUT1
OUT2
OUT3
A15
B15
C15
D15
C13
B13
A13
C14
B14
A14
C16
C17
B1
A8
C12
B7
C10
B9
C11
B8
A7
A5
4
3
2
1
28
27
26
25
24
23
5
6
8
F1
+3.3V
21
Q9
5
2
4
9
11
11
13
8
6
4
2
1
7
13
Q10
F2
To Next Page
Loading...
Need help?
General