EPSON Stylus PHOTO 2000P
Revision A
OPERATING PRINCIPLES
Electrical Circuit Operating Principles
51
PTS (Print Timing Signal) production
The circuit produces PTS signal (cycle: 1/360 inches) by dividing
waveform cycles of Phase A. The print timing signal is used to eject
ink at a correct timing.
Figure 2-18. Print Timing Signal and Linear Encoder Phase A
PF motor driver circuit
A DC motor is used as the PF motor in this printer. In addition to the CPU
and ASIC, a slave CPU is mounted on the C304MAIN board. Since the
slave CPU is exclusively used to control DC motors, it reduces duty of
CPU and ASIC to offer faster data processing. The block diagram for the
PF motor driver circuit is as shown below:
Figure 2-19. PF Motor Driver Circuit Block Diagram
Slave CPU (C90A26CA) controls paper feeding amount by referring to the
encoder pulses sent from ASIC (IC18). It sends a proper drive current
value to the motor driver. Based on the control signal from the slave CPU,
the motor driver (IC19) outputs drive current to the PF motor.
Unlike a stepping motor, this DC motor can not detect paper feeding
amount by referring to the pulses given. For this reason, a loop scale is
Phase B
Phase B
1/180”
1/360”
Phase A
Phase A
IC19
A3958SB
IC15
C90A13CA
IC8
E05B70CD
PF-A
PF-B
42V
C116
0.22U
OUTA
OUTB
CP1
CP2
VREG
SENSE
C120
022U
C119
0.22U
GND
GND
GND
ENABLE
PHASE
MODE
RANGE
REF
OSC
CLOC
DATA
STOROBE
PD3
PD1
PD0
PD4
DA0
-
SCON
PD6
PD5
PD7
P17
P15
P20
P21
NMI
NMI
P31
RD1
P33
TD1
P32
CRBI3
P30
CRPHAB
P64
CRENBB
RES
CRAI2
MD2
P25
CPU
IC24
M62552FP
R138
4.4B
R139
4.99B
C137
0.1U
R113
0.24
CRAI3
CRBI0
CRPHAA
ENA
ENB
CRENBA
CN12
PE Encorder
Содержание 2000P - Stylus Photo Color Inkjet Printer
Страница 5: ...5 Revision Status Revision Issued Date Description A May 11 2000 First Release ...
Страница 9: ...C H A P T E R 1 PRODUCTDESCRIPTIONS ...
Страница 31: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Страница 55: ...C H A P T E R 3 TROUBLESHOOTING ...
Страница 75: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Страница 118: ...C H A P T E R 5 ADJUSTMENT ...
Страница 138: ...C H A P T E R 6 MAINTENANCE ...
Страница 148: ...C H A P T E R 7 APPENDIX ...
Страница 166: ...04 03 01 02 for S E ASIA 03 03 06 05 MC 2000 EPSON STYLUS PHOTO 2000P No 6 Rev 01 10206 ...
Страница 167: ...805 804 804 800 802 803 801 806 806 08 MC 2000 EPSON STYLUS PHOTO 2000P No 7 Rev 01 10206 ...
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