Product Description
LQ-300
Service Manual
1.5 MAIN COMPONENTS
The main components of the
LQ-300
is
components are:
■
C143
MAIN board: control board
■
C130
PSB/PSE
(120 V/230 V) board:
■
M-5M1O: Printer mechanism
■
Housing
1.5.1 C143 MAIN Board
designed for easy removal and repair. The main
power supply board
The
C143
MAIN
board consists of the
TMP90C041
(CPU), an
E05B02(GA),
a
program/CG
ROM, a
PS-RAM,
an
EEPROM,
etc.
PROM
PSRAM256K
TM P90C041 (CPU)
(Program /
CG)
EEPROM
E05B02(GA)
4-2
SC5060
a
a
o o’/
(PF Motor Driver)
I
\
[
6-STA475A
(Printhead Driver)
boll
n
0
00
SLA7022M
(CR Motor Driver) /
/
_
UPC78M05AHF
(Regulator
IC)
2-M51955B
(Reset
IC)
\ (Color Option)
Figure 1-8.
C143
MAIN Board Component Layout
1.5.2
C130
PSB/PSE
Board
The power supply boards are the same as those for the LX-300. The boards have two ratings for
input AC voltages:
120 VAC
(C130
PSB)
and 230 VAC
(C130
PSE),
Both boards consist of a
transformer, switching
FETs,
regulator
IC,
diode bridge, etc. The power supply board provides
+5 VDC and +35
VDC
for the main board and printer mechanism.
Switching FET
Diode Bridge
Transformer
Power Switch
“n=.
(j
yu
❑
n
nnnn
II
--
~
I
1-----
m
l/--
lu~uuul
—1
\
\
/
Reaulator
IC
Figure 1-9.
C130
PSB/PSE
Board Component Layout
1-24 Rev. A
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