Eeprom Control Circuit; Csmotorassembly Circuit - Epson LX-300 Service Manual

Operating Principles

2.3.10 EEPROM Control Circuit

shows the
information as the top-of-form position. The EEPROM is non-volatile memory, so information is
not lost if the printer is powered off. Since the EEPROM is a serial I/O-type device, the CPU
converts 8-bit data into serial data.
SYSTEM IC
Figure 2-22. EEPROM Control Circuit Diagram
2.3.11 CS Motor Assembly Circuit
Figure 2-23 shows a block diagram of the CS motor assembly arcuit in the optioml color upgrade
kit. The CS motor assembly is a pe rmanent ma~et (PM) stepping motor, driven with
excitation in proportion to the desired mtatioti
direction and stopped at any position. Four phase signals are directly output from the system IC
and pass through a transistor array. The drive voltage is constant (i.e., +35 VDC from the VP line).
Source Voltage
Current Con~ump60n
SYSTEM
Figure 2-23. CS Motor Assembly Circuit Diagram
2-18
(ICI)
1
9
Cs
7
2
2
3
3 4
Do
speed. W motor GUI be rotated in either
35 VDc *
10
245 mA ( peak)
147
14a
I
Printer
Service Manual
2-2
MOTOR ASSY.,CS
CS_A
Color Upgrade Kit
"-%
phase