Service manual
© Elcom s. r. o.
Euro 2500
TX
18
• error signals
• printer status signals
• paper tape feed signals
• paper cutter end position signal
All these functions are provided by the circuits described in the following subchapters.
Tab. 2.2: Pin description for U4 circuit
Fig. 2.10: Printing control signals
Pin #
Descritpion
Type
Signal description
1
LATCH
I
Signal of data logging into a circuit
2
STB1
O
Printer head activation signal
3
D0
I
Data input from data bus
4
D1
I
Data input from data bus
5
STB2
O
Printer head activation signal
6
M+
O
Tape cutter control signal
7
D2
I
Data input from data bus
8
D3
I
Data input from data bus
9
M-
O
Tape cutter control signal
10
GND
I
0 V power supply
11
PR-SEL
I
Circuit activation
12
EN1
O
Printer motor activation signal
13
D4
I
Data input from data bus
14
D5
I
Data input from data bus
15
EN2
O
Printer motor activation signal
16
W-MOT
O
Signal of journal winder control
17
D6
I
Data input from data bus
18
D7
I
Data input from data bus
19
P-LATCH
O
Signal of data logging into the printer latching register
20
VCC
I
+5 V power supply
Tab. 2.3: Pin description for U5 circuit
Pin #
Description
Type
Signal description
1
VCC3V3
I
+3.3V power supply
2
D7
I
Data input from data bus
3
D6
I
Data input from data bus
4
GND
I
0 V power supply
5
D5
I
Data input from data bus
6
D4
I
Data input from data bus
7
VCC3V3
I
+3.3V power supply
8
D3
I
Data input from data bus
9
VCC3V3
I
+3.3V power supply
10
D2
I
Data input from data bus
