DOWNLOAD Sharp ER-A850 (serv.man5) Service Manual ↓ Size: 100.38 KB | Pages: 7 in PDF or view online for FREE

Model
ER-A850 (serv.man5)
Pages
7
Size
100.38 KB
Type
PDF
Document
Service Manual
Brand
Device
EPOS / ERA8DP One Line Display Service Manual
File
er-a850-sm5.pdf
Date

Sharp ER-A850 (serv.man5) Service Manual ▷ View online

SERVICE MANUAL
CODE: 00ZERA8DPSM/E
COSTOMER DISPLAY
OPTION FOR ECR
MODE 
ER-A8DP
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
2. Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
3. Circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
4. PWB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
Parts guide
SHARP CORPORATION
CONTENTS
Parts marked with "
!
" is important for maintaining the safety of the set. Be sure to replace these parts with specified ones
for maintaining the safety and performance of the set.
1. General
The ER-A8DP is a customer display option for the ECR.
7-segment display:
Font:
Positions:
7 positions
Character size:
13.0(H) 
 6.0(W) mm
2. Circuit description
2-1. Display unit power supply circuit 
(converter transformer circuit)
2-1-1. Oscillation circuit
1) When the pin-14 output level of the comparator IC1C is at high
(open), the positive voltage of the pin-9 becomes about +2.7V by
the voltage division with the positive side divider resistors (parallel
connection R112, R111, R10) and R109. At this point, the nega-
tive voltage on the pin-8 is charged from R104 to C101 and begins
to rise.
2) When the negative side voltage turned higher than the positive
side, the output is then inverted to low level.
3) When the pin-14 output of the comparator IC1C has turned low,
the pin-9 positive voltage turns to about 2.3V by the voltage divi-
sion with R111 turned to the negative side voltage dividing resistor
and the parallel inserted resistors R109 and R111, and R10 volt-
age division. Then, for the negative voltage on the pin-8, the
charge in C101 is discharged through R104.
4) The output turns high when the negative side voltage went lower
than the positive side voltage.
Above steps 1) through 4) are repeated to oscillator.
2-1-2. Basic drive circuit
1) The converter transformer is driven with the signal from the oscilla-
tion circuit in 2-2-1. In case the feedback signal and the overcur-
rent are not detected, it will be driven by this circuit.
2-1-3. Feedback circuit
These signals are used for input to the comparator IC1D, pin-11 (+)
line of the feedback circuit.
 
1
  –29V feedback signal
 
2
 Overcurrent monitor signal (reter to "2-1-4")
1) The feedback from –29V line is sent to the pin-11 of IC1D as a
voltage divided by R113 and R101. The comparator IC1D com-
pares the signal from the pin-11 with the comparator IC1C pin-8
signal of the oscillation circuit to control the feedback.
2) When the level on the pin-10 goes above that of the pin-11 at a
rising of the comparator IC1D pin-10 signal (Q1 turns on when the
comparator IC1A of the basic drive circuit turned off), the compa-
rator IC1D output turns on and Q1 turned off to stop driving the
converter transformer.
If the level of the pin-11 signal was  higher than the level of the
pin-10 (–29V being shallow), the drive time prolong. If the level of
the pin-11 signal was lower than the level of the pin-10 (–29V
being deep), the drive time shortens.
R111
51k
9
8
14
IC1C
IR2339N
R109
10KF
R104
100K
C10 1
330P
R112
1.5K
R10
10KF
VCC
(+5V)
VCC
(+5V)
5V
0V
2.7V
2.3V
14Pin
9Pin
8Pin
2.7V
2.3V
IC1A
IR2339N
6
Q1
C3144
7
3
12
1
5V
From oscillation circuit
A
C103
0.1µ
IC1D
IR2339N
10
11
13
R113
30KF
From pin-8 of IC1C
-29V
VCC(+5V)
A
R101
2.4K
B
2.7V
2.3V
2.5V
High
Low
High
Low
ON
OFF
10pin (-)
11pin (+)
TR1 output
Comparator IC1D
Comparator IC1B
Comparator IC1D
pin-2 output
pin-13 output
– 1 –
2-1-4. Overcurrent monitor circuit
1) The pin-4 of the comparator IC1B is the overcurrent monitor input.
2) If the Q1 driving current increased and the voltage across R1
becomes above 0.5V, the comparator IC1B output turns on and its
level goes low and the voltage at 
B
 turn low.So, Q1 turns off by
the feedback circuit.
2-2. Display control
2-2-1. CKDC4 (HD404728A75FS)
1) General description
The CKDC4 is a 4-bit microcomputer developed for the ECR and
provides functions to control the real-time clock, keys, and displays.
The basic functions of the CKDC4 are shown below.
Keys:
The CKDC4 is capable of controlling a maximum of 256
momentary keys. (Sharp 2-key rollover control)
Simultaneous scanning of key and switch
(When a key is scanned, the state of a mode and clerk
switch is also buffered. The host can scan the state of
switch together with the key entry data at the same time
the key is scanned.)
Switches:
Mode switch with 14 positions maximum
8-bit clerk (cashier) switch
2-bit feed switch
1-bit receipt on/off switch
1-bit option switch
4-bit general-purpose switch (1-bit is used for keyboard
select)
Displays:
16-column dot display
12-column 7-segment display (column digit selectable)
All column blink controlled for the dot and 7-segment
display decimal point and indicators
Programmable patterns for 7-segment display:
Four patterns
Internal driver for 7-segment display
Buzzer:
Single tone control
Clock:
Year, month, day of month, day of week, hour, minute
Alarm:
Hour, minute
Interrupt request (event control):
Detection of key input, switch position change, alarm
issue, and counter overflow
Fig. 2-5
IC1B
IR2339N
Q1
C3144
5
4
1
B
R1
0.39/1W
About 0.5V
R103
4.3K
3
A
VCC
(+5V)
R102
6.2K
R108
1.1K
IRQ
SHEN
STH
HTS
SCK
POFF
STOP
SRES
CKDCR
HOST
SYSTEM
7SEG-DISPLAY 12DIG
DOT-DISPLAY 16DIG
GO
~
G
1
1
SA
~
S
G
P0
,1
,4
CKDC 4
P2,3
DI
G0
0
DI
G1
5
SE
G
0
0
SE
G
1
5
DOT DISP CONT.
M66004EP
SRES,DCS,DSCK,DSO
ST0~3
KEX0,1
DECODER
LS138
DECODER
LS138
KEYBOARD
MAX. 244key
DECODER
LS153
DECODER
LS153
D
ISPS
L
SKR
O
Q
BUZZ
BUZZER
CSFR
MODR
KR0
~
3
– 2 –
2) Pin assignment
Pin
No.
Port
I/O
RESET
State
Signal
name
I/O
Notes
PULL
 
UP
DOWN
1
R0
1
I/O
H-Z
SB
O
DB4 : SEG-B 
PULL-DOWN
2
R0
2
I/O
H-Z
SC
O
DB4 : SEG-C
PULL-DOWN
3
R0
3
I/O
H-Z
SD
O
DB4 : SEG-D
PULL-DOWN
4
R1
0
I/O
H-Z
SF
O
DB4 : SEG-E
PULL-DOWN
5
R1
1
I/O
H-Z
SE
O
DB4 : SEG-F
PULL-DOWN
6
R1
2
I/O
H-Z
SG
O
DB4 : SEG-G
PULL-DOWN
7
R1
3
I/O
H-Z
P4
O
DB7 : 7SEG COM
PULL-DOWN
8
R2
0
I/O
H-Z
P0
O
DB2 : DOT DP : NU
PULL-DOWN
9
R2
1
I/O
H-Z
P1
O
DB3 : DOT COM : NU
PULL-DOWN
10
R2
2
I/O
H-Z
P2
O
DB5 : 7SEG DP
PULL-DOWN
11
R2
3
I/O
H-Z
P3
O
DB5 : 7SEG  ID
PULL-DOWN
12
RA
0
I
I
MODR
I
MODE RETURN  : NU
PULL-UP
13
RA
1
I
I
CFSR
I
CASHIER, PAPER
FEED SWITCH   :
NU RETURN 
PULL-UP
14
R3
0
I/O
H-Z
KEX0
O
KEY    EXCHANGE0 : NU
15
R3
1
I/O
H-Z
KEX1
O
KEY    EXCHANGE1 : NU
16
R3
2
I/O
H-Z
RQ
O
INPUT Q : NU
17
R3
3
I/O
H-Z
SKR0
O
kEY SELECTO : NU
18
R5
0
I/O
I
ST0
O
KEY SCAN ST0 : NU
19
R5
1
I/O
I
ST1
O
KEY SCAN ST1 : NU
20
R5
2
I/O
I
ST2
O
KEY SCAN ST2 : NU
21
R5
3
I/O
I
ST3
O
KEY SCAN ST3 : NU
22
R6
0
/INT0
I/O
I
POFF
I
P-OFF : NU
23
R6
1
/INT1
I/O
I
STOP
I
STOP : NU
PULL-UP
24
R6
2
/INT2
I/O
I
DDIG
O
DOT  DISPLAY DIGIT INPUT : NU
25
R6
3
/INT3
I/O
I
DCS
O
DOT DISPLAY CONT./CS : NU
26
Vcc
Power supply
27
R4
0
/SCK
I/O
I
SCK
I
SCK
28
R4
1
/SI
I/O
I
HTS
I
HTS
29
R4
2
/S0
I/O
I
STH
O
STH
30
R4
3
/PWM
I/O
I
SDISP
I
DISP SELECT : NU
31
R7
0
/BUZZ I/O
I
BUZZ
O
BUZZER : NU
32
R7
1/
SCK2
I/O
I
DSCK
O
DOT DISP CONT. SCK : NU
33
R7
2
/SI2
I/O
I
SRES
O
SYSTEM RESET : NU
PULL-DOWN
34
R7
3
/S02
I/O
O
DS0
O
DOT DISP CONT. SO : NU
35
R8
0
I/O
O
SHEN
O
SHEN
36
R8
1
I/O
O
IRQ
O
IRQ : NU
37
R9
0
I
I
KR0
I
KEY RETURN 0 : NU
38
R9
1
I
I
KR1
I
KEY RETURN 1 : NU
39
R9
2
I
I
KR2
I
KEY RETURN 2 : NU
40
R9
3
I
I
KR3
I
KEY RETURN 3 : NU
41
RESET
CKDC IV RESET 
42
OSC2
4.91 MHz
43
OSC1
4.91MHz
44
GND
GND
45
CL1
32.768 KHz
46
CL2
32.768 KHz
47
TEST
I
I
+5V
5V
48
D0
I/O
H-Z
G0
O
7 SEG DIG 0
PULL-DOWN
49
D1
I/O
H-Z
G1
O
7 SEG DIG 1
PULL-DOWN
50
D2
I/O
H-Z
G2
O
7 SEG DIG 2
PULL-DOWN
51
D3
I/O
H-Z
G3
I
7 SEG DIG 3
PULL-DOWN
52
D4
I/O
H-Z
G4
O
7 SEG DIG 4
PULL-DOWN
53
D5
I/O
H-Z
G5
O
7 SEG DIG 5
PULL-DOWN
54
D6
I/O
H-Z
G6
O
7 SEG DIG 6
PULL-DOWN
55
D7
I/O
H-Z
G7
O
7 SEG DIG 7 : NU
PULL-DOWN
56
D8
I/O
H-Z
G8
O
7 SEG DIG 8 : NU
PULL-DOWN
57
D9
I/O
H-Z
G9
O
7 SEG DIG 9 : NU
PULL-DOWN
58
D10
I/O
H-Z
G10
O
7 SEG DIG 10 : NU
PULL-DOWN
59
D11
I/O
H-Z
G11
O
7 SEG DIG 11 : NU
60
D12
I/O
H-Z
PO0
O
 : NU
61
D13
I/O
H-Z
PO10
O
 : NU
62
D14
I/O
H-Z
PO2
O
 : NU
63
D15
I/O
H-Z
PO3
O
 : NU
64
R0
0
I/O
H-Z
SA
O
DB4 : SEG-A
PULL-DOWN
NOTE 3: Pull-up/down in the table indicates that the lines concerned
require external pull-up/down resistance.
2-2-2. General description
As ER-A8DP connection check signal, the signal OPD is sent to
ECR PWB.
2-2-3. Signal description
The ER-A8DP incorporates only one new interfacing signal which is
described below. For other interfacing signals, refer to the main PWB
description.
OPD: Option display presence signal
ER-A8DP
OPD level
Main PWB judgement
Connected
High
Connected
Not connected
Low
Not connected
ERC side
KRES
HT S
SCK
SHEN
STH
ODS
ER-A8DP
RESET
HT S
SCK
SHEN
STH
OPT DISP CN
CKDC4
ECR Main PWB
+5V
RESET
SHEN
SCK
– 3 –
Page of 7
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  • Here you can View online or download the Service Manual for the Sharp ER-A850 (serv.man5) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp ER-A850 (serv.man5) EPOS. Information contained in Sharp ER-A850 (serv.man5) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.