EPSON Stylus Color 900

Revision C

The following tables list the major components on the C265 main board and their functions.

Table 2-14. Major Components on the C265 Main Board (1/2)

Component

Functions

 

 

 

• A Hitachi H8-series CPU.

CPU:

• Performs high-speed data processing running at 24.0

Mhz with an external transmitter.

 

 

• Bus width is 16-bit.

 

 

ASIC 1:

• Controls all interfaces but USB.

(E05B60: IC3)

• Monitors the signal from each sensor.

 

 

ASIC 2:

• Controls printheads, motors, ASF solenoid, cooling fan,

(E05B59: IC2)

USB I/F, and EEPROM.

 

 

 

• For PROM, either one-time PROM or Mask ROM is

 

used. Specifications vary depending on the

 

destinations, as shown below:

 

<Standard version>

 

• PROM size: 16 M bit

PROM/MROM:

• Contents: Unattached

 

• Bus width: 16 bit

 

<NLSP version>

 

• PROM size: 16 M bit

 

• Contents: 16 M bit

 

• Bus width: 16 bit

D-RAM:

• Manages the various buffers and work area.

• Bus width is 16 M bit.

 

 

 

 

• Counts total power off time of the printer, which offers

 

the basis for determining the cleaning type to be

 

performed at the next power on. Power is supplied by

 

an external button-cell battery (a lithium battery). This

Timer IC:

IC also serves to produce reset signals connecting to

(RTC9810: IC8)

each major IC, such as CPU, ASIC1, ASIC 2, and motor

 

drive ICs. The head driver ICs (CXA2128 x 2: IC15 and

 

IC16) individually produce a reset signal when detecting

 

abnormal voltage so the printhead can stop in the

 

proper sequence.

 

 

Table 2-15. Major Components on the C265 Main Board (2/2)

Component

Functions

 

 

 

• The LB1847 (IC11 and IC12) is used to drive PF motor

 

and CR motor and enables 4W1-2 phase excitation

 

mode for the first in EPSON line. This control system,

 

called micro stepping, materializes the control of the

Motor driver IC

carriage vibration during printing and improvement of

(LB1847: IC11, 12)

accuracy in paper feeding on the hardware basis.

(A3957: IC13, 14)

• The A3957 (IC13 and IC14) used to drive Pump, ASF

 

motor also supports the 4W1-2 phase excitation mode on

 

the hardware basis, but differs from the former IC in the

 

point that the IC13 and IC14 individually excite the phase

 

A and B.

 

 

 

• The head driver ICs, directory attached to the board,

 

consist of two separate circuits; charging circuit and

 

discharging circuit, to produce trapezoidal waveform.

Head driver IC

This IC creates the trapezoidal waveform by combining

(CXA2128 x 2: IC15,

the signals input from the input port E05B59 (IC2) of the

16)

IC. This is performed to change the characteristics and

 

voltage levels of charging and discharging, and the

 

trapezoidal waveforms specific to normal dot print and

 

micro dot print are produced as the result.

 

 

Operating Principles

Electrical Circuit Operation Principles

60

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Epson SEIJ98006 manual Major Components on the C265 Main Board 1/2, Major Components on the C265 Main Board 2/2
Page 59 Page 61

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