© Elcom s. r. o.
Service manual
Euro 2500
TX
19
Fig. 2.11: Control circuit for the printer step motor (the LTP 2W42 printers contains two step motors, each with its independ-
ent control)
Pin #
Description
Type
Signal description
11
GND
I
0V power supply
12
D1
I
Data input from data bus
13
CS7
I
Circuit activation for printer hour and data production
14
A19
I
Address input
15
D0
I
Data input from data bus
16
GND
I
0V power supply
17
VCC3V3
I
+3.3V power supply
18
PRNCLK
O
Printer clock output
19
A20
I
Address input
20
CS4
I
Address decoder input
21
PRINTMOD1
I
Circuit actuating signal for printer hour and data production
22
CS6
I
Address decoder input
23
PRINTMOD2
I
Circuit actuating signal for printer hour and data production
24
GND
I
0V power supply
25
8MHz
O
Clock output for DUART
26
GND
I
0V power supply
27
CSCRT
O
Current time circuit activation
28
CSUSB
O
Additional communication channel activation
29
VCC3V3
I
+3.3V power supply
30
GND
I
0V power supply
31
HWR
I
Sigal of data logging into circuit
32
NC
Unused
33
CS42
O
#2 RAM memory activation
34
CS43
O
#3 RAM memory activation
35
CS44
O
#4 RAM memory activation
36
GND
I
0V power supply
37
INCLK
I
System clock input
38
GND
I
0V power supply
39
GND
I
0V power supply
40
GND
I
0V power supply
41
VCC3V3
I
+3.3V power supply
42
DPR
O
Data output for printer
43
LATCH
O
Signal of data logging into U4 circuit
44
CS41
O
#1 RAM memory activation
Tab. 2.3: Pin description for U5 circuit (cntd.)
