Operating Principles
LQ-300
Service Manual
2.3.11 EEPROM Control Circuit
Figure 2-23 shows the
EEPROM
control circuit block diagram. The
EEPROM
(IC6)
contains such
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.
CPU (lCl)
EEPROM
(IC3)
+5
v
A
05
3
ā
Cs
Vcc
L
}
38
06
2
CK
07
::5
3
DI
17
4
ā
DO
GND
)
+ā7-
Figure 2-23.
EEPROM
Control Circuit Diagram
2.3.12 CS Motor Circuit
Figure 2-24 shows a block diagram of the
CS
motor circuit in the optional color upgrade kit. The
CS motor is a permanent magnet (PM) stepping motor, driven with 2-2 phase
exatation
in
proportion to the desired rotational speed. This motor can be rotated in either direction and
stopped at any position. Four phase signals are directly output from the system
IC
and pass
through a
tcansistorarray.
The drive voltage is constant (i.e., +35
VDC
from the VP line).
Source Voltage
35 VDc
*
10
?40
Current Consumption
245
mA
( peak)
I
GATE ARRAY
(IC2)
I
CS
MOTOR
-
1
MT3
MT2
MT1
MTO
I=%z
9
i
Q1
49
4a
47
04
*
CS-B
CS-A
CS
B
CS A
CS-HOLD
Printer
Figure 2-24. CS
I
Color Upgrade Kit
Motor Circuit
.
.-
2-18
Rev.A
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