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Model
ER-A850 (serv.man2)
Pages
92
Size
1.18 MB
Type
PDF
Document
Service Manual
Brand
Device
EPOS / ERA850 880 Service Manual
File
er-a850-sm2.pdf
Date

Sharp ER-A850 (serv.man2) Service Manual ▷ View online

ER-A880 LCD unit
1. Structure and external view
Structure: 640 
×
 480 full dot graphic display unit
This dot matrix LCD unit is composed of the LCD panel,
the PWB which includes electrical components, the TAB
(Tape Automated Bonding) which connects them, the
backlight section which is composed of the cathode ray
tube, the optical guide plate, and the diffusion sheet, and
the plastic chassis and the bezel which fix them mechani-
cally. 
2. Mechanical specifications
Item
Specifications
Unit
Unit external dimensions 253 (W) 
×
 174 (H) 
×
 7 MAX. (D)
mm
Effective display area
196 (W) 
×
 147.6 (H)
mm
Display format
640 (W) 
×
 480 (H) full dot
Dot size
0.27 
×
 0.27
mm
Dot interval
0.03
mm
*
1 Dot color
White 
*
2
*
1 Background color
Black 
*
2
Weight
About 340g
g
*
1:
The color of the LCD panel varies depending on the environ-
mental temperature. 
*
2:
Negative type display unit
Data "H" 
 ON = White
Data "L" 
 OFF = Black
3. Absolute max. ratings
(3-1) Electrical absolute max. ratings
Item
Symbol
Min.
Max.
Unit
Remark
Logic circuit
V
DD
 – V
SS
0
  6.0
V
Ta = 25°C
LCD drive circuit
V
DD
 – V
EE
0
30.0
V
Ta = 25°C
Input voltage
V
IN
0
V
DD
V
Ta = 25°C
(3-2) Environmental conditions
Item
When storing
When operating
Remark
Min.
Max.
Min.
Max.
Ambient
temperature
–25°C
+60°C
0°C
+45°C
Note (4)
Humidity
Note (1)
Note (1)
Free from
dew.
Vibration
Note (2)
Note (2)
XYZ,
3 directions
Shock
Note (3)
Note (3)
±
±
±
Z,
6 directions
Note (1): Ta 
t
 40°C......95%RH max.
Ta > 40°C.....Absolute humidity Ta = 40°C, 95%RH or less
Note (2): Conforms to IEC 68-2-6.
Frequency range
10 Hz 
 57 Hz
57 Hz 
 500 Hz
Vibration level
9.8 m/s
2
Full amplitude
0.075 mm
Sweep frequency
10 Hz 
 500 Hz 
 10 Hz/11 min
2 hours in each direction of X, Y, and Z (6 hours in total)
Note (3): Acceleration 490m/s
2
, pulse width 11ms, 3 time in each of
±
X, 
±
Y, 
±
Z directions
Note (4): This LCD unit must not subject to temperatures outside the
specified range. 
4. Electrical specifications
(4-1) Electrical characteristics
Item
Symbol
Conditions
Min.
Standard
Max.
Unit
Logic circuit
power volt-
age
V
DD
 –
V
SS
4.75
5.0
5.25
V
LCD drive
circuit power
voltage
V
EE
 –
V
SS
(Note 1) (Note
2)
–23.2
–18.9
–15.1
Input voltage
V
IN
HIGH level
0.8 V
DD
V
DD
V
LOW level
0
0.2 V
DD
V
Input leak
current
I
IL
HIGH level
250
µ
A
LOW level
–250
µ
A
Logic circuit
power cur-
rent
I
DD
(Note 3)
24
36
mA
LCD drive
circuit power
current
I
EE
15
25
mA
Power
consumption
Pd
380
590
mW
(Note 1) The view angle (
θ
) which provides the max. contrast can be
set by varying the lCD drive voltage (Vzz – Vss). For the
definition of the view angle, refer to Fig. 4.
(Note 2) The max. and main. values of the standards show the max.
and min. voltages in the range of the operating temperature
(0°C 
 45°C).
The standard value is at 25°C.
(Note 3) High frequency pattern
V
DD
 = 5V, Vzz – Vss = –18.9V, F = 85 Hz, Display pattern = 1 bit
plover
LCD
LSI (TAB)
PWB
CCFT
Bezel
(Antiglare process, hard coat 3H rquivalent)
Optical guide plate
Backlight holder
P-shassis
Display
Pattern
– 78 –
(4-2) Input capacity
Signal
Input capacity 
S
 40 pF
TYP.
CP1, DISP
250 pF
TYP.
CP2
200 pF
TYP.
DU0 
 DU3
200 pF
TYP.
DL0 
 DL3
200 pF
TYP.
(4-3) Interface signal
LCD
Pin No.
Symbol
Content
Effective signal
level
  1
S
Scan start signal
H
  2
CP1
Input data latch signal
 L
 3
CP2
Data input clock signal
 L
  4
DISP
DISP control signal
Display on: H, off: L
 
5
V
DD
Logic circuit power (+5V)
 
6
V
SS
GND potential
 
7
V
EE
LCD drive power (–)
 8
DU0
Display data signal
(Upper half screen)
H (ON), L (OFF)
 9
DU1
10
DU2
11
DU3
12
DL0
Display data signal
(Lower half screen)
H (ON), L (OFF)
13
DL1
14
DL2
15
DL3
CCFT
Pin No.
Symbol
Content
Effective signal
level
1
GND
GND pin (From invertor)
2
NC
3
NC
4
HV
High voltage input pin
(From invertor)
Fig. 1 Dot table of display
1dot
2dot
3dot
640dot
1dot
2dot
3dot
240dot
241dot
480dot
1
1
2
1
3
1
1
2
2
2
3
1
240
241
1
1
480
1
1
240
241
480
640
640
640
640
Vertical
Lateral
Note: "1.2" shows the first vertical and second lateral dot.
1
2
3
640
1dot
2dot
3dot
240dot
241dot
480dot
DU3 DU2 DU1 DU0 DU3 DU2 DU1 DU0
DU3 DU2 DU1 DU0 DU3 DU2 DU1 DU0
DU3 DU2 DU1 DU0
DU3 DU2 DU1 DU0
DL3 DL2 DL1 DL0
DL3 DL2 DL1 DL0
4
5
6
7
8
DU3 DU2 DU1 DU0
DU3 DU2 DU1 DU0
DL3 DL2 DL1 DL0
DL3 DL2 DL1 DL0
Vertical
Lateral
– 79 –
Fig. 2 Data input timing chart
CP1
CP2
DU3
240 637
1
1
1
5
1 637
2
1
2 637
Invalid
Invalid
DU2
240 638
1
2
1
6
1 638
2
2
2 638
Invalid
Invalid
DU1
240 639
1
3
1
7
1 639
2
3
2 639
Invalid
Invalid
DU0
240 640
1
4
1
8
1 640
2
4
2 640
Invalid
Invalid
DL3
480 637
241
1
5
637
242
1
637
Invalid
Invalid
241
241
242
DL2
480 638
241
2
6
638
242
2
638
Invalid
Invalid
241
241
242
DL1
480 639
241
3
7
639
242
3
639
Invalid
Invalid
241
241
242
DL0
480 640
241
4
8
640
242
4
640
Invalid
Invalid
241
241
242
S
DU0 ~ 3
1 (1 ~ 640)
CP1
240 (1 ~ 640)
1 (1 ~ 640)
DL0 ~ 3
241 (1 ~ 640)
480 (1 ~ 640)
(1 ~ 640)
CP2 X 640/4 pulses
S
CP1 X 200 pulses
241
Reduction
– 80 –
Fig. 3 Interface timing
tr
tf
t
LWH
t
S12
t
S21
T
CP2
t
CWL
t
CWH
tr
tf
CP1
CP2
t
SU
t
H
DU0~3
CP2 X (640/4) pulses
S
t
SSU
t
SIL
T
FRM
=8.0 ~ 16.9ms
CP1
S
first
line's
data
transfer
second
line's
data
transfer
240th
line's
data
transfer
CP1 X 200 pulses
V
IH
=0.8
VDD
V
IL
=0.2V
DD
Note1
Note1: Refer to Tab.7
Reduction
– 81 –
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