C144 Main Board - Epson ActionLaser 1300 EPL-3000 Service Manual

General Description

1.5.1 C144 MAIN Board

The C144 MAIN board is a video controller circuit and engine controller arcuit board. The primary
functions of the video controller circuit are receiving print data from the host, generating the print
image (video), and sending the print image to the engine controller arcuit via the video interface. A
Motorola 68ECCX10, 16-bit, 16.7 MHz CPU (location: IC6) is used, and the following memory chips
and custom ICS are assigned to the 16 MB memory space.
Memory chips
Code ROM: two 4Mbit EEPROM (IC17, 18) or one 8Mbit mask ROM (IC19)
Font ROM: one 8Mbit mask ROM (M80ATBD: IC8)
Code and font ROM: one 16Mbit mask ROM (IC8)
Note: This printer can select one included code and font ROMora separate type.
Jumper Settings
J2 J4
1-2 1-2
1-2 1-2
1-2 2-3
Custom ICS
PAL E06A01 (IC22)
The engine controller arcuit consists of an M37451M4 8-bit CPU (including a MASK ROM) and a
gate array. The circuit controls laser scanning (the polygon mirror drive motor), image
synchronization, laser beam pulse width, and power.
There are two types of C144 MAIN boards used as after-service parts. The following table shows
differences between them.
Table 1-12. Differences in Components for the C144 MAIN Boards
Optional intefface connector
Jumper J3
Note: The first release C144 MAIN board also has a small board (C144 SUB board).
1-24
Table 1-11. ROM and Jumper Settings
I
Code U
—
.
Connector used
short
ROM Locations
—
Code L
.
Code ROM
— —
ActionLaser 1300
None
None
. .
Font ROM
Font ROM
Code & Font
ROM
Rev. A