C257 Main, (For Stylus Color 740) - Epson Stylus Color 640 Service Manual

EPSON Stylus Color 440/640/740

2.2.4 C257 Main, (for Stylus Color 740)

Various DC voltage generated on the C257 PSB/PSE board is added
various signals in order to drive the printer function on the C257 main
board the drive of CR/PF (Pump) motor and printing head is performed.
Following figure shows the circuit diagram for Stylus Color 740.
Chapter 2 Operating Principles
CN3 USB
P-ROM
(IC3)
Head
D-RAM
(IC4)
CN1 Parallel
D-RAM
(IC5)
Buffer
(IC9)
M-ROM
(IC6)
E05B588
(IC2)
C90A05
(IC1)
Address
Data
Transceiver
(IC10)
CN2 Serial
Figure 2-19. C257 Main Board Block for Stylus Color 740
CN9 HD FFC
CR1
Batt1
Q2&Q3
Timer
Common
Counter Driver
(IC8)
(IC14)
EEPROM
Reset IC
Motor
(IC7)
(IC9) Driver
(IC11)
CN11
CN6
CN4
CN5
HP Sensor
PE Sensor
CR Motor
PF Motor
CN7
CN8
Motor
Driver
(IC12)
Motor
Driver
(IC13)
C209 PNL
ASF Sensor
Revision A
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