ER-A850 (serv.man2). ERA850 880 Service Manual - Sharp EPOS Service Manual (repair manual). Page 85

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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
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