I/O Circuits; Printing Control Circuits; Fig. 2.13 Printer Control Signals; Fig. 2.14 Printer Motor Control And Control Of The Journal Winding Motor - ELCOM Euro-500 Handy Series Service Manual

Euro-500TX Handy

2.3 I/O circuits

2.3.1 Printing control circuits

The Euro-500TX ECR employs the thermal printer CITIZEN LT-1320. For the reliable functioning of the
printer it is necessary to provide control for:
• printing signals for flawless print,
• printer step-motor
• journal winding motor
• signals ensuring proper functionality and protection of the printer
The following circuits provide all these requirements:
U5
D0
3 2
D0 Q0
D1
4 5
D1 Q1
D2
7 6
D2 Q2
D3
8 9
D3 Q3
GND
13 12
D4 Q4
GND 14 15
D5 Q5
D6
17 16
D6 Q6
D7
18 19
D7 Q7
PR-SEL
1
20
OE
VCC
LATCH
11 10
CLK GND
74HC374
VCC
1
A
2
GND
VCC
4
B
5
GND
VCC
9
10
GND
VCC
12
13
GND

Fig. 2.14 Printer motor control and control of the journal winding motor

Service manual
STB1
STB2
STB3
STB4
W-MOT
D16
P-LATCH
LL4148
VCC1
PR-SEL
R38
C40
10k
C65 100n
1n
P-LATCH
R94
VCC1
LATCH
1k
R95
PR-DATA
1k
R96
PR-CLK
220R

Fig. 2.13 Printer control signals

C48
100n
D5
x VCC1
14
U8A
LL4148
&
AN
3
74HC00
7
x
14
U8B
&
BN
6
74HC00
7
x
14
U8C
&
8
74HC00
7
x
14
U8D
&
11
74HC00
7
VCC1
D17
FMKA140
U7
1
Vin
C43 2
C41
GND
3
ON/OFF
1u/35V 100n
LP2985IM5-3,3
R12
0R
VCCA
U6
VCCA 1
#TDI
D0 2
D1 3
D2 5
D3 6
VCCA 7
#TMS
D7 8
D6 10
D5 12
PR-SET 13
D4 14
15
18
19
20
21
22
EPM70(30)32STC44-10
R55
EN GND
10k
U17
EN
1 16
1,2EN VCC1
9 8
3,4EN VCC2
AN
2 3
1A 1Y
A
7 6
2A 2Y
BN
10 11
3A 3Y
B
15 14
4A 4Y
4 13
GND GND
5 12
GND GND
L293D
AVA 5400-2P-S
W-M
R46
VCC
1
0R
2
C73
100n
C74
100n
© Elcom, s. r. o.
VCCA
5
Vout
4
Cb
C58
C64
C47
4,7u/6,3V 100n
10n
23
25
26 GND
#TCK
27
28
31
32
#TDO
33 A19
34 PR-DATA
35 PR-CLK
37 SYSCLKs
INCLK
38
OE1
39
GCLRn
40
OE2
42 CS4
43 HWR
44 LATCH
VCC1
VH
PA1N
PA2
PB1N
PB2
D10
LL4148
R40
W-MOT
4k7
T13
BC817
17