The +5 V Power Source (Vcc1); Power Supply For The Printer Performance Circuits (Vh); Accumulator Voltage To The Vh Voltage Converter; Fig. 2.3 Vcc1 Power Supply - ELCOM Euro-500 Handy Series Service Manual

Euro-500TX Handy

2.1.4 The +5 V power source (VCC1)

This power source supplies a group of logical circuits with power. Those circuits are not powered all the
time (printing, serial port transmission, etc... in normal mode) and function from time to time as needed. In
the economy and standby mode this power supply is ineffectual.

2.1.5 Power supply for the printer performance circuits (VH)

This power source is used for the supplying of the printer's thermal head performance circuits, the step-
-motor circuit, and the produces programming voltages for the fiscal memory.

2.1.6 Accumulator voltage to the VH voltage converter

The voltage converter is used to produce the VH voltage for the printer's thermal head performance circuits.
The core element here is the LM2588-ADJ that converts the accumulator voltage to the fixed voltage of
23 V. The converter is switched off automatically when the EECR gets connected to the external power
source.
Service manual
RFP15P05(SFP9Z34)
VCC
R29
100k
R35
SAVEPWR
100k
R113
NMI
100k

Fig. 2.3 VCC1 power supply

D2
VIN
MBRS340T3
C16
2200u/25V

Fig. 2.4 VH power supply

Ls1
47uH
LM2588-ADJ
7
Vin
BAT+
2
Comp
Rs3
2k7/F
Cs1
Cs2
330u/25V
100n
Cs3
1u
Rs7
22k

Fig. 2.5 Accumulator voltage converter circuit

VCC1
C7
T5
330u/25V
T6
BC817
T7
BC817
T1
RFP15P05(SFP9Z34)
VH
R1 R2
100k 100k
R3
T2
SAVEPWR
BC817
100k
R4
T3
NMI
BC817
100k
MBRS340T3
Ds1
Rs2
47k
3
FB
Cs4
100n
Us1
Rs1
2k7/F
Ds2
Rs5
VIN
10k
LL4148
Ds3
Rs6
2k2
LL4148
Rs4
1M
Ts1
Rs8
47k
NMI
2N7002
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