C265 Main Board - Epson SEIJ98006 Service Manual

EPSON Stylus Color 900

1.7.2 C265 Main Board

The main features of the C265 Main board are as follows.
1. IEEE1284 compliant
ECP mode is available
Type-B I/F is available
2. Mac serial I/F is available (at 900 K bps, 1.8 M bps, 3.6M bps).
3. USB full-speed is available (at 12 M bps without the hub).
4. All motors (CR motor, Pump/ASF motor, and PF motor) are
controlled with the micro step system (using up to 4W1-2 phase
excitation mode) and current attenuation mode (First, Slow, Mixed,
and Decay).
5. Intensive temperature control of the new type of the printhead:
operates the cooling fan using the thermistors and the abnormal
temperature detection circuit on the printhead board.
H8S2357, a CPU which is the hub of the C265 Main board, has an
internal flash memory with the size of 128 KB. Since the CPU runs with
24 MHz, it can send print data efficiently for a high throughput. The
C265 Main board has two independent exclusive ASICs, ASIC1 and
ASIC2. The former controls all interfaces but the USB I/F and sensors,
while the latter controls the printhead, motors, encoder, and USB I/F.
The combined IC (IC8) which has a normal timer IC and EERPOM in
one chip also features the printer. Since the EEPROM counts ink
consumption at the valuable printing
*1: The valuable dot system, or many-valued dot system, enables the
printer to freely fire three different sizes of dots (normal, middle, and
small dots) in one raster. In other printers, if the super micro dot
mode is once selected through the printer driver, the printers prints
only in the selected mode until the current print data is completed.
Product Description
*1
, its size has increased to 2 K bit.
Component Layout
However, the valuable dot system of this printer enables the printer
to fire three different sizes of dots in one raster, and ink-jet specific
adverse conditions such as uneven printing and white banding are
improved as a result.
The C265 Main board is also equipped with a CG-ROM which deals
with DOS users. The CG ROM attachment condition and size are as
shown in Table 1-24.
Table 1-24. Relation between P-ROM and CG ROM
Destination
Standard version 16 M (TEE01X)
NLSP version 16 M (TEE01X)
NOTE:The "X" in the table represents the version.
Revision C
P-ROM CG-ROM
Not installed.
16M (M160B16XA)
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