Samsung ER-220 User manual

SERVICE MANUAL
ER-220/ER-240
ELECTRONIC CASH REGISTER
SPECIFICATION
ITEM SPECIFICATION ITEM SPECIFICATION
POWER AC 120, 220, 240/50Hz, 6OHz | DRAWER 4B/8C,5B/5C,3B/4C,4B/4C
RATING 16 WATT VOID, OFF, REG, X, Z, PGM
PRINTER CP121CRS
DISPLAY FRONT(9), REAR(Q)
Design and specifications are subject to change without notice.

This
equipment
generates,
uses,
and
can
radiate
radio
frequency
energy,
and
if
not
installed
and
used
in
accordance
with
the
instruction
manual
,
may
cause
interferance
to
radio
communications.
It
has
been
tested
and
found
to
comply
with
the
limits
for
a
Class
A
computing
device,
pursuant
to
subpart
J
of
part
15
of
FCC
Rules,
which
a
redesigned
to
provide
reasonable
protection
against
such
interferance
when
operated
in
a
commercial
environment.
Operation
of
this
equipment
in
a
residential
area
is
likely
to
cause
interferance,
in
which
case
the
user
at
his
own
expense
will
be
required
to
take
whatever
measures
may
be
required
to
correct
the
interferance.
SSeS TS SSS STS SSS SSS SSS SS SSS SS SSS SS
This
ELECTRONIC
CASH
REGISTER
is
the
microprocessor
based
system,
using
an
8 - bit
single
chip
microcomputer.
This
service
manual
provides
technical
information
for
many
individual
component
systems,
and
circuit,
and
gives
an
analysis
of
the
operations
performed
by
the
circuits.
The
Keyboard,
power
supply,display
and
printer
circuit,and
the
other
circuitry
are
covered.
Also
included
is
technical
information
on
the
CITIZEN
single
station
printer
used
in
this
machine.
If
you
need
more
technical
service,
please
call
our
service
branch.
Schemetics
and
specifications
provide
needed
information
for
the
accurate
trouble-shooting.
All
information
in
this
manual
is
subject
to
change
without
prior
notice.
Therefore
you
must
check
the
correspondence
of
your
manual
with
your
machine.
No
part
of
this
manual
may
be
copied
or
reproduced
in
any
form
or
by
any
means
without
the
prior
written
consent.
of
ours.

1.
SYSTEM
BLOCK
DIAGRAM
-
----------------------
1
2.
DISASSEMBLY
MAIN-PWB
-
-
-
-
-
-------------------
2
3.
SYSTEM
INSTALLATION
- -
-
-
-
-------------------
3
3-1
BATTERY
ON/OFF
SWITCH
-
-
-
------------------
3
3-2
SYSTEM
RESET
PROCEDURE
-
-
------------------
3
4.
CIRCUITRY
di.
APOWER
CURCUIT™
S208
S
ee
See
Sie
ee
ae
ae
4
4-2.
BATTERY
CIRCUIT
-
----------------------
5
4~3
RESET
AND
POWER
FAIL
DETECTION
CIRCUIT
-
-----------
6
4-4
DISPLAY CIRCUIT
-----------------------
6
4-5
DRAWER
CIRCUIT
- -
-
-
-
-
OS
2
SS
Lah
SG
ee
Sek
7
4-6
BUZZER
CIRCUIT
-
-----------------------
7
4-7
KEYBOARD
CIRCUIT-
--
-
-
-------------------
8
4-8
REAL TIME
CLOCK
-
----------------------9
4-9
PRINTER
CIRCUIT
-----------------------
10
5.
PART
SPECIFICATION
-
-
- -
----------
----------
11
6.
MAIN
PCB
LAY
OUT
-
----------r
-
er
rte
er
er
err
eee
ee
14
7.
CIRCUIT
DIAGRAM
-------------------------
15
8.
PART
LIST
9.
DISASSEMBLY
SYSTEM

1.SYSTEM BLOCK DIAGRAM
Vv
POWER Bae ae! DISPLAY a DISPLAY
SUPPLY ae DRIVER
VDD | VPF
RESET
K CIRCUIT eae? PRINTER
DRIVER
CPU
POWER FAIL
CIACUIT 8032
CASH DRAWER
Wi
CLOCK
12MHZ
CLOCK
32. 768KHZ
REAL TIME
CLOCK
RPSC15 KEY BOARD
BUZZER
BACK UP DATA MEMORY PEDGHAM
BATTERY MEMORY

2.DISASSEMBLY
MAIN-PWB
DRAWER
COMPULSQGRY
POWER-TRANS
STAMP/PAPER FEEDING MOTOR
0
DISPLAY
10P} PRINTER
MODE SWITCH
KEY BOARD

3.SYSTEM INSTALLATION
3-1 BATTERY ON/OFF SWITCH
Look at the MAIN PWB, you can find a small JUMPERED SWITCH at the
BATTERY side. The purpose of this switch is to minimize the consumption
of battery power when this machine is not used for a long time.
For the normal operation, this switch must be placed at the ON position.
WARNING : If you turn OFF this switch while using the set, it changes the
' time and values that are preseted.
3-2 SYSTEM RESET PROCEDURE
When install the machine, SYSTEM RESET must be performed before
operation.Plug in, while depress [-%], [VD]. [#/NS] keys in 3 seconds at
PGM mode. Then, this system will be reset and all data will be cleared.
(REFER TO USERS MANUAL)
WARNING :You should not do this procedure after installation.
If you do so, all counter and total sums be lost.
TRANSFORMER SPECIFICATION
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a [reir [sonny [cum
Pasa [av ome m0 iran]
eno [ a ste 6) 8.58 ot] ne
[nk 0 ne er on | oe
ee
3
4
5
FUSE1
PRI. 6
7
8
9
LOC. NO EUROPE CODE NO. U.S.A CODE NO.
FUSE1 | 250V FIA 949 115003FHNA 125V NM1A | 949 115101NLNA
FUSE2 | 250V T2A 949 115009THNA | 125v SBzA | 949 115101SLNA

4.CIRCUITRY
4-1 POWER CIRCUIT
This machine has two different power sources, the one is a power
circuit and the other is a BATTERY.
The power circuit generates five different DC voltage sources, +5V
for the logic, +17¥ for the printer driving, +4V and -24V for the display
and +11.2V for the power fail detection circuit.
The BATTERY applies +3.6V to the back-up circuit.
A. VPP(+17V)
The VPP voltage is used for the source voltage of the printer drive
circuit. The AC 18V is rectified by the BRIDGE DIODE RECTIFIER BD1 and
it is regulared by the capacitor 50V 2200uF.
The switching circuit composes circuit of 2 Transistors KSC945 and
KSD288,a zener diode 18V, to maintain the output voltage at DC 17V.
B. VPF(+11.2V)
The VPF voltage is used for the input voltage of the power fail
detection and reset circuit.
The AC9.5V is rectified by the BRIDGE DIODE RECTIFIER BD2 and
regulated by the capacitor 35V 10uF. Then the output is +11.2V.
C. VCC(+5V)
The VCC is used for the power source of the system logic.
The most part of this voltage, rectified by the BD2 and passed
through the diode 1N4003 , is regulated by the capacitor 35V 2200uF,
and it input the 3 - terminal regulating IC MC7805. Then output voltage
is applied to directly to the logic and other +5V terminal.
1N4003
VF
a
VF
K
VDI
+
OZ
24v
SOVI0OUF
si
680
D
GND
1N4003
OC
TE: <\PF
Rees “<V GE
Ss tri BV 100UE
ae
es,
“a
pane Los rr
1K-1W
Since
a Mav
(a) ae
2200UF

D. VE(+4V)
The VF voltage is used for providing the power to the filament
of the DIGITRON. The AC 4V is rectified by the diode rectifier 1N4003
and regulated by the capacitor 16V 470uF. The 4V output voltage heats
the filament of the DIGITRON.
E. VDI(-24V)
The VDI voltage is used for providing to the GRID and PLATE of
DIGITRON. The AC 22V is rectified by the diode rectifier 1N4003 and
then regulated by the capacitor 50V 100uF. The switching circuit composes
of a zener diode 24V and a transistor KSA733, it maintains the output
voltage at DC -24V.
4-2 BATTERY CIRCUIT
In the normal operation, VCC voltage goes to the BATTERY through D2,
R for the charge. At the power off, BATTERY voltage goes to the RAM
(HY6116) and RTC(RP5C15). This operation is able to keep saving the DATA
for a long time without the external power source.
>
1N4148
CON S/W
1N4448
HY6116
(RAM)
— _NI-CD 3/60D
T fas i GEOG
| (RTC)

4-3 RESET AND POWER FAIL DETECTION CIRCUIT
The reset circuit prevents the CPU f i
rom st
the ace is fully powered-up and initialized. pune aPetinnes ees oke
e power fail detection circuit is to save th
oe
we
e
state
of
th
nm
s
meaningful
data
before
the
logic
voltage
of
CPU
goes
Pisani
e
normal
operation
voltage
on
the
condition
such
as
main
power
off
=
VPF
VCC
VGC
4-4 DISPLAY CIRCUIT
This circuit is composes display and turret(c
; ustomer) for di
lager ia i og Parr Digit and segment sinal Bd rane
: tout: vie : :
Fee cea p e Digitron by the amplituding IC IR2CO5 through LATCH
Re
es
a
i,itt—l,
Ii
J-i,{_i,i_t,lI,l—,
Sson
eee
oe
Cae
a
RM400KX6P
3EA
ialialidislis§
|
asm
|
slualieladislas,
|,
IR2C05
ae
IR2C05
“ey
erg
i
ei
ree
1 VDI
es
Sl
ai
Sh
GSR
Gb
ne
2
wo
LS574
°
sor
iss74
[s
2@aaal
a
a[e|s]9]7/s[3|2
it
G43a(
TT
cae
Ai4
Ait
DO:
-
sce
07
|)
pe
wm
ase

4-5 DRAWER CIRCUiT
The
Drawer
circuit
is
activated
by
using
the
signal
P1.1
from
the
CPU.
This
signal
is
normally
LOW,
and
goes
HIGH
to
cause
STA301
to
turn
ON
and
activate
the
drawer
solenoid,
then
the
Drawer
is
opened.
» VPP
1N4003
STA301
SOLENOIDE
DRAWER
4-6 BUZZER CIRCUIT
The
Buzzer
is
activated
by
the
NORMAL
INPUT
of
the
key
and
ERROR
state.
This
signal
is
normally
LOW,
and
goes
HIGH
to
turn
on
the
ULN2003A
and
activates
the
BUZZER
.
In
the
case
of
the
normal
input
of
the
key,
it
activates
during
about
50msec,
in
the
case
of
ERROR
state,
it
activates
until
stop
operation
such
as
CLEAR
key
input.
BUZZER

4-7 KEYBOARD CIRCUIT
Key scun is completed by applying the scan signal on the address
line and the return signal on the data line of CPU through key switch and
74HCTLS541.
41
wT
Ww
Yu)
—J
a s
~
O
x

4-8 REAL TIME CLOCK CIRCUIT
The clock circuit composes of a timer IC RP5C15, a crystal 32.768KHz
and two capacitor.
CPU directly accesses RP5C15 by the DATA bus therefore any
desirable Time counters can be written to or read from the clock in the
same way as writing to or reading from RAM as well as calendar, time
counters and alarm function allowing battery back-up
cs voD
32 | 768KHZ

4-9 PRINTER CIRCUIT
At the first, CPU drives DC motor through STA301, the timing signal
CP and RP is generated from the ptinter to CPU for appling information of
the any character position. The TR converts the analog timing signal
to the digital signal.
When the signal of desirable position is detected, CPU activates the
appropriate Hammer Solenoid through the ULN2003A, then meaningful
information will be printed on the paper.
CPU
8032 INTO
[oa
oO
“7
9°]
~t
i
a.
Oo
ac
J
=
=
—
x
a
-10-

5. PART SPECLFLICATLUN
8032 CPU
USER
PRN MOTOR
DRAWER
STAMP
SPOOL
TS1( PRINTER )
TS2( PRINTER)
TS3( PRINTER)
TS4( PRINTER ) Pl.
RESET RST
DIGIT 1 P3.0 EA/VPP
BUZZER P3.1 ALE/PROG
RP( PRINTER) P3.2 PSEN
CP(
PRINTER
)
INT1
P2.
COMPULSORY
P3.4
P2.
BREAK(+18N)
P3.5
P2.
WRITE
WR
P2.
READ
RD
P2.
P2.
P2.
P2.
- jl -

EPROM 27128 RAM
_ Ad
VPP vcc A7 VCC
A12
PGM
A6
A8
A7
A13
AS
A9
A6
A8&
A4
WR
A5
AQ
A3
OE
All A2 A10
A3 OE Al CE
A2 A10 AO D7
Al CS DO D6
AO D7 Dl DS
DO D6 D2 D4
D1 DS GND D3
D2 D4
GND D3
8 X 16KByte EPROM
oc ycc oc
1D 1Q 1D
2D 2Q 2D
3D 3Q =63D
4D 4Q 4D
5D 5Q 5D
6D 6Q 6D
7D 7Q #=7D
8D 8Q 8D
GND E GND

ING
IN7
GND
' DARLINGTON TR-ARRAY
G1
Al
A2
A3
A4
AS
AG
AT
A8
GND
OUT1
OQUT2
OUTS
OUT4
OUTS
OUT6
OUT?
vcc
FUNCTION TABLE(LS541)
IR2C05
CURRENT DRIVER
STA301
1 GND
2 IN1
3 OUTi
4 IN2
5 OUT2
6 IN3
7 OUT3
8 GND
DARLINGTON TR-ARRAY
-438-
OUT1
OUT2
OUT3
OUT4
OUTS
OUT6
NC
SUB

6.MAIN
PCB
LAY
OUT
ee
on
Bim
02+
AyBNGLE
LAL”
82
or 125V NALA ||
g0001BAi(
;t;!;*!~!SCSCO
RAG
aa CNS
wn
n —
- oO
as vT ~~
CNS
JAI6
JAi2
[cso
JAILS
JAI4
“SALLY
agg
CAL
CN7
JAQ
R26. JB20
-~ 14 -

PART Li#s T¥
( ER-220N )
- 16-

1. ASSY LOWER CASE
813 390012AA
813 390013AA
813 390018AC
821 390058BA
821 390123AC
841 214022BA
842 343022AB
842 344022AB
842 345027AB
842 444013AB
842 840007BG
842 840009AA
855 133001BB
955 001380AAAA
955 001382AAAA
965 001384AAAA
955 001385AAAA
965 00141GAAAA
923 390001AA
923 390001BA
923 390001CA
923 390001DA
842 344022AB
855 124001BB
813 390049AA
842 443008AB
847 501009DA
855 124001BB
855 133001BB
955 390043AAAA
3. ASSY HOLDER MOTOR
813 390044AA
821 390034AA
821 390044AB
821 397011AA
841 312603BB
842 44302248
855 114002AB
855 122601BB
953 280032AA
IMP, HOLDER CORD:SBHG1 T1.0
IMP, BRACKET-CAS ING :SBHG1.6
IMP, BRACKET-FOOT:SCP1 T1.6
PLT, HOLDER-PRINTER: ABS VO
PLT, CASE-LOWER : ABS VO VH-
(POWER-CORD)
CBF-POWER CORD, 1600MM:LP-33 HOVV-F 0.75
CBF-POWER CORD, 1600MM:KP-550 LTSA-3
CBF-POWER CORD, 1600MM:HS-3 SVT
CBF-POWER CORD, 1600MM:GTBS-3 HOVV-F
CBF-POWER CORD, 1600MM:GB13A4 HOVV-F
(POWER-TRANS )
TRANS-POWER, 220V /SOHZ
TRANS~POWER, 240V /SOHZ
TRANS-POWER, 120V/60HZ
TRANS-POWER, 110, 220V/60HZ
TAPPING, Pt, 2,M4,L10:PH, +
WASHER, SPRING, M4:M4, ID4. 1
(GROUND-PLATE)
IMP, PLATE-GROUND:SBHG1 T1.0
TAPPING, RH+, 2,M3,L6:RH, +,
SPECIAL, TAPTITE, P+, M4*6
WASHER, SPRING, M4:M4, ID4. 1
WASHER, TOOTHED ET,M3:M3, I
CBF-TERMINAL LOG, 90MM
IMP, HOLDER MOTOR :SBHG1 T1
PLT, PULLY-WINDING A:ABS
PLT, HOLDER-WINDING : ABS vo
-17-
[wm [quem | mescmaerion /sactrctio =
mr OD DY Oe DD OD DO
mm 09 DO RD be et et
UN.
| eee
SEES SESE R EEE
SBEBEEE BEBEBEE EEEEE
SESE EEEEE

813 390030AA
813 390042AA
813 390060AA
821 390047AA
821 390048AA
821 397006AA
821 397006AB
821 397006AD
831 521032AA
857 boiler
380008AA
353 033124AAAA
813 390114AA
813 390115AA
821 390138AA
23004-701-010
23004-701-310
23004-701-410
23599-700-210
26402-700-710
26403-700-410
26402-702-010
26402-702-110
813 390097AA
26403-701-510
26674~710-610
26674-710-710
26674-7 10-810
27148-530-060
27
9} 28131-701-910
DIGITAL PRINTER :CP-121CR
INC, LABEL SERTAL
TAPPING, RHt, 2, M3, L8
TAPPING, Pit, W, 25, M3, LB
WASHER, TOOTHED
WASHER, PLAIN
, >
FERRITE, TOROIDA
MAG-OORE,
CBF-TERMINAL RING, 260M
TOP 1:ABS
TOP 2:ABS
TOP 3:ABS
TOP 4:ABS
TOP 6:ABS
TOP 7:ABS
TOP 8:ABS
TOP 9: ABS
TOP 00:ABS
TOP 5:ABS
~1B-