
Service Manual
ALS/XLS 20x/256/272
02/2019 | 03
183
Block diagram
[131] Block diagram of operator panel (ALS)
Stand-By-Key
+5V
+5V
Display 128 x 32 dots
Sitronix ST 7920-0B
with extension segment driver
ST 7921
LCD controller / driver
with build in
GB code simplified Chinese
character set
COM 32
SEG 128
Vo
(contrast)
+5V
+5V
back light
+5V
/('JUHHQ21
+5V
/('UHG(5525
0LFURFRQWUROOHU
$70(/
ATmega 168-20AU
16kBytes Flash
TQFP32
D
B
[0
..7
]
LCD-RS
L
C
D-RW
LCD-E
+5V
+5V
1
6
5
4
3
2
RS485
transceiver
SP491E
UART-RXD
UART-TXD
+5V
+5V
1
2
.H\
(6&
main boar
d c
onnec
to
r
J
S
T
B6B-
PH
-K
-S
+5V
UART-TXEN
4k7
4k7
470R
470R
line
termination
8$57
N%DXG
power s
uppl
y
c
onnec
to
r
M
o
le
x
53047-
0210
Display 128 x 32 dots
Y
A
21
67$786
OD
PP
IN
PP
PP
PP
IN
IN
IN
PP
PP
IN
VCC
GND
RST\
Program & Debug (SPI)
.H\
83
.H\
2.
.H\
'2:1
LCD-RS
T
\
PP
prog / debug
1
2
3
4
5
6
MISO
VCC
SCK
MOSI
RST\
GND
Reset\
(OD)
14.7456 MH
z
XTAL
XTAL
I2C-Bus
I2C-Bus
1
2
3
4
VCC
SCL
SDA
GND
Molex 53398-0471
Molex 53398-0671
OD
Status
Содержание ALS/XLS 204
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Страница 8: ...Service Manual ALS 20x 256 272 05 2019 8 Contents ...
Страница 110: ...Service Manual ALS XLS 20x 256 272 02 2019 02 110 ...
Страница 258: ...Service Manual ALS XLS 20x 256 272 02 2019 03 258 Repair 199 Removing the fan C A B C D ...
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