© Elcom Ltd.
Service manual
7
Euro-500T Handy
+4,9 ±0,05V (only if S AVE PW R is logic 1)
C7
330 u/25V
VC C 1
VC C
SAVE PW R
T15
R F P1 5P05 (SF P9 Z3 4)
R29
100 k
T14
BC 817
R35
100 k
T16
BC 817
R113
100 k
LV OF F /N M I
+5 ±0 ,05V
+ 4,8 ± 0,05 V
BAT S EL 3 is interconnected for se ale d battery
BAT S EL 3 is no t in tercon nected fo r N iM h batte ry
1
2
BATT
AVA 54 00-2P-S
R5
510 R
R9
1k 0/F
C9
220 0u/25 V
BT1
3V 6, 60 m Ah
VC C
VR AM
VB AT
D4
1N 5 819
2
1
4
3
U14
KA 278 R 05
F1
3.1 5A+ h olde r
JP 1
Ba tt 3p
VC C
2
G N D
3
R S T
1
U12
V6 340/F
R6
6k 8
LV OF F /N M I
LV OF F /N M I
VB AT 1
C8
1u/35V
1
2
PW RS W
AVA 54 00-2P-S
D3
1N 5 822
D20
LL4 148
JBP 3
BAT S EL 3
C13
100 n
C70
100 n
R30
0R
R112
47k
VB AT f
N M I
R S T
1
IN
2
G N D
3
N .C .
4
N .C .
5
U12 A
N C P 301L SN 45T 1
LV O F F /N M I
C O M P IN
Va lue s of c om p on e nts for differe nt com p arators :
V 6340/F
N C P 301LSN 45T 1
R 5
R 6
R 112
4 7K
0 R
6 k8
2 2k/F
2 k/F
5 10 R
R50
4 7k
1 0k
2.1.3 Voltage stabilizer
To reduce the amount of power, logical circuits of the cash register are divided into two groups:
1. the group connected by VCC voltage, which can be switched on only by a PWSWR switch
2. the group connected by VCC1 voltage, which can be switched by the micro-processor only when printing,
communicating and recording into the fiscal memory
The U14 voltage stabilizer functions as a means to switch on and stabilize a VCC connecting voltage for the first group of the cash
register logical circuits. The circuit was designed to be switched on by a PWRSW on/off switch connected through AVA 5400-2P-S 2-
pin connector. T14, T15, and T16 transistors produce VCC1 voltage for the second group of logical circuits. They are operated by a
micro-processor SAVEPWR signal. An integrated U12 circuit controls the values of the battery voltage. If the voltage gets too low it
automatically generates the signal for switching off the supply.
To keep current time and data stored in RAM memory, the cash register is supplied with a reserve BT1 battery. When the cash register
is switched on the battery is being recharged through R9 resistor and when the cash register is switched off it serves as a supply of the
reserve voltage.
Figure 2.3 Voltage stabilizer
Measured values:
VBAT1:
6,0 V +0,3 V -1 V; when using the internal accumulator without the connected external adapter
(the supply is automatically switched off at a voltage of 5 V),
6,9 V ±0,2 V; when using the lead accumulator with the connected external adapter.
VBAT1:
7,6 V +0,9 V, -1 V; when using the internal NiMh accumulator without the connected external adapter
(the supply is automatically switched off at a voltage of 6,6 V),
8,4 V +0,2 V, -0,6 V; when using NiMh accumulator with the connected external adapter.
VRAM:
4,8 V ±0,05 V; when the cash register is switched on (VCC = 5 V),
3,6 V +0,5 V -0,1 V; when the cash register is switched off (VCC = 0 V).
Note:
The removal of the JP1 jumper when the cash register is switched off will cause the deletion of all data in RAM memory and in
the current time circuit.
Internal accumulator scheme
Accumulator
BATT
+
(red)
2
-
(black)
1
