Operating Principles
Table 2-3. Main IC Functions
Name
Location
Functions
Receives data from the host computer via the gate array,
loads the data to the input buffer in PS-RAM, and
converts the image data to print data.
features are:
CS (Chip Select) signal creation
Address decoding
Address latching
P R O M
P S - R A M
S D C 0 3
NJM2903
Clock pulse creation (divided from the CPU clock)
Printhead driver control
CR motor driver control
CR and PG motor pulse encoder
(input/output)
Encoder pulse
Phase signal creation for the motors
port control
Interface control
Abnormal CR and PF motor detection
RESET signal creation
Control signal creation for the power supply board
PROM
Contains the program that runs the CPU.
Holds the CPU working area and buffers (input, line, and
image buffers).
Drives the RF motor and controls the constant current.
Drives the PG motor.
Detects the current in the CR motor driver and feeds it
back to the gate array.
Drives the CR motor.
Reset Circuit
This section describes the hardware reset circuit. When the hardware reset signal
is input, all
in the control circuit are reset, and the CPU executes the program
from the starting address. Figure 2-20 shows the reset circuit block diagram.
The printer is equipped with two reset
is used for resetting the + 5
VDC line and M5 1955 is used for resetting the
VDC line. These reset
are
described on the following page.
EPSON
Service Manual
2-25
Summary of Contents for DFX-5000+
Page 1: ...EPSON Service Manual Epson America Inc TM DFX5K ...
Page 154: ......
Page 212: ...Appendix Table A S CN7 C117 MAIN Board Assembly A 8 EPSON DFX 5000 Service Manual ...
Page 218: ......
Page 219: ...Appendix DFX 5000 Exploded Diagram 1 EPSON DFX 5000 Service Manual A 15 ...
Page 220: ...Appendix Figure A 5 Exploded Diagram 2 A 16 EPSON DFX 5000 Service Manual ...
Page 221: ...597 J86 ...
Page 222: ...Appendix A 18 EPSON DFX 5000 Service Manual ...
Page 223: ...Appendix Figure A 7 C117 MAIN Board Circuit Diagram EPSON DFX 5000 Service Manual A 19 ...