Epson FX 1170 Service Manual - Page 67

REV.-A, TMP90C041F, printhead, E2PROM, UPA1475H, Table 2-5. Functions of Main Components - parts list

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. REV.-A Table 2-4 lists the functions of the main components of the C094 MAIN. Table 2-5. Functions of Main Components of C094 MAIN IC or Circuit Functions TMP90C041F (2C1) Receives data from the host computer and loads it to the input buffer in RAM. Expands the input data held in the buffer to create image data. Loads the image data to the image buffer in RAM. Transfers the image data to the printhead drive circuit. Also controls various printer mechanism parts, such as the motors. E05A66YA (IC4) This gate array mainly performs the following five functions: " Memory management q Centronics l/F control q Control panel control q E2PROM control q Printhead drive circuit control PROM (IC3) The PROM contains the program that runs the CPU. RAM (IC2) The RAM contains the CPU working area and the buffers. E2PROM (5CI) The EZPROM is used to store information such as the top-of-form position. UPA1475H (lCl) Drive circuit for PF motor SLA7024M (IC5) Drive circuit for CR motor 2-24

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.
REV.-A
Table 2-4 lists the functions of the main components of the
C094
MAIN.
Table 2-5. Functions of Main Components of
C094
MAIN
IC
or Circuit
Functions
TMP90C041F
(2C1)
Receives data from the host computer and loads it to the input buffer in RAM.
Expands the input data held in the buffer to create image data. Loads the image
data to the image buffer in RAM. Transfers the image data to the
printhead
drive circuit. Also controls various printer mechanism parts, such as the
motors.
E05A66YA
(IC4)
This gate array mainly performs the following five functions:
“
Memory management
Centronics l/F control
Control panel control
E2PROM
control
Printhead
drive circuit control
PROM
(IC3)
The PROM contains the program that runs the CPU.
RAM
(IC2)
The RAM contains the CPU working area and the buffers.
E2PROM
(5CI)
The
EZPROM
is used to store information such as the top-of-form position.
UPA1475H
(lCl)
Drive circuit for PF motor
SLA7024M
(IC5)
Drive circuit for CR motor
2-24