Epson 2080 Service Manual - Page 24

LQ-2080, Revision A, Operating Principles, Control Circuit - driver lq

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LQ-2080 Revision A The following figure shows the data flow from the host computer to the printhead. Data sent from the host computer is converted to image data and transmitted to the printhead through the gate array. Figure 2-2. Data Flow The table below lists the each function of the main components of the C273 Main Board. IC CPU Gate Array EEPROM ROM RAM CG SLA7024M A2917SEB Table 2-1. Functions of the Main Board Location Function Receives data from the host computer and sends it to the input buffer in RAM (under interrupt IC 4 processing control). Extends the input data held in the buffer to create image data. Loads this image data to the image buffer in RAM. Transfers the image data to the printhead driver circuit. Controls the functions below: • Controls output data from the internal block • Memory management • Address latch of the address/data bus from the CPU IC 3 • Clock control unit • Bit manipulation • Interface control • Expanded parallel port • Printhead control • Motor control An electrically writable and erasable ROM used to IC 5 hold information such as the TOF position and bidirectional adjustment value. IC 10 The ROM contains the program that runs the CPU and holds the character design (also called the character generator). IC 8 The RAM contains the CPU working area and the buffers. IC 6 The CG contains the bitmap fonts for each character table. IC 11 Driver circuit for the CR motor. IC 12 Driver circuit for the PF motor. Operating Principles Control Circuit 24

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LQ-2080
Revision A
Operating Principles
Control Circuit
24
The following figure shows the data flow from the host computer to the
printhead. Data sent from the host computer is converted to image data
and transmitted to the printhead through the gate array.
Figure 2-2.
Data Flow
The table below lists the each function of the main components of the
C273 Main Board.
Table 2-1.
Functions of the Main Board
C
P
U
TM
P
96C
041B
F
G
a te A
rray
E
05B
24Y
B
P
r in th e a d d r iv e
c ir c u it
P
r
i
n
t
d
a
t
a
c
o
n
v
e
r
s
i
o
n
1
P
r
i
n
t
d
a
t
a
c
o
n
v
e
r
s
i
o
n
2
D
a
t
a
l
a
t
c
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a
n
d
d
a
t
a
o
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t
p
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t
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d
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a
t
r
a
n
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f
e
r
H
ost
C
om
p u te r
P
a
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a
l
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l
I
/
F
O
p
t
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I
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F
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A
M
In p u t
B
u ffe r
Im
a g e
B
u ffe r
L in e E
d it
B
u ffe r
IC
Location
Function
CPU
IC 4
Receives data from the host computer and sends it
to the input buffer in RAM (under interrupt
processing control). Extends the input data held in
the buffer to create image data. Loads this image
data to the image buffer in RAM. Transfers the
image data to the printhead driver circuit.
Gate Array
IC 3
Controls the functions below:
•
Controls output data from the internal block
•
Memory management
•
Address latch of the address/data bus from the
CPU
•
Clock control unit
•
Bit manipulation
•
Interface control
•
Expanded parallel port
•
Printhead control
•
Motor control
EEPROM
IC 5
An electrically writable and erasable ROM used to
hold information such as the TOF position and
bidirectional adjustment value.
ROM
IC 10
The ROM contains the program that runs the CPU
and holds the character design (also called the
character generator).
RAM
IC 8
The RAM contains the CPU working area and the
buffers.
CG
IC 6
The CG contains the bitmap fonts for each character
table.
SLA7024M
IC 11
Driver circuit for the CR motor.
A2917SEB
IC 12
Driver circuit for the PF motor.