Samsung ER-3715 Series User manual

& SAMSUNG
Electronics
SERVICE
MANUAL
ELECTRONIC
CASH
REGISTER
ER
—
3715/3615
SERIES
CR-802A/812A
FRONT(10), REAR(9)
Design and specifications are subject to change without notice.

w*k* TABLE OF CONTENTS kk
1. SYSTEM INSTALLATION
1-1 START UP INSTRUCTIONS
1-2
1-3
GENERAL WARNING
TRANSFORMER AND FUSE SPECIFICATION
2. CIRCUITRY
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
POWER CIRCUIT
BATTERY CIRCUIT
RESET AND POWER FAIL DETECTION CIRCUIT
DISPLAY CIRCUIT
DRAWER AND BUZZER CIRCUIT
KEYBOARD CIRCUIT
REAL TIME CLOCK CIRCUIT
PRINTER CIRCUIT
3. SPECIFICATION OF MAJOR COMPONENT
3-1
3-2
3-3
3-4
CPU-PORT DESCRIPTION
CR-802A/CR-812A PRINTER
F.P.C. TERMINAL ARRANGEMENT
GENERAL SPECIFICATIONS
KA2657,LM339, 74HCT138
74HCT573, 74HCT574, 74HCT541, IR2CO5
SRAM 62256,SRAM 6264,EPROM 27C512
DIGITRON FG97D6/FG1010RB6
4. GENERAL OVERVIEW
SYSTEM BLOCK DIAGRAM
MAIN PCB LAYOUT
DISASSEMBLY MAIN PCB
CIRCUIT DIAGRAM
5. SERVICE PARTS LIST
MAIN PART
EXPLODED VIEW
ASSY KEY-BOARD
DRAWER
PRINTER
3 - 8
10
11
11
12
12
13
14
15
16
17
18
19
20
21
12

WARNING (US ONLY)
This
equipment
has
been
tested
and
found
to
comply
with
the
limits
for
a
class
A
digital
device,
pursuant
to
part
15
of the FCC Rules.
These
limits
are
designed
to
provide
reasonable
protection
against
harmful
interference
when
the
equipment
is operated
in a
commercial
environment.This
equipment
generates,uses,and
can
radiate
radio
frequency
energy
and,if
not
installed
and
used
in
accordance
with
the
instruction
manual,may
cause
harmful
interference
to
radio
communications.
Operation
of
this
equipment
in
a
residential
area
is
likely
to
cause
harmful
interference
in
which
case
the
user
will
be
required
to
correct
the interference
at
his
own
expence.
SYSTEM OVERVIEW
This
ELECTRONIC
CASH
REGISTER
is
the
microprocessor
based
system,
using
an 8-bit single chip microprocessor.
This
service
manual
provides
technical
information
for
many
individual
‘component
systems,circuit
and
gives
an
analysis
of
the
operations
performed by the circuits.
Also
included
is
technical
information
on
the
EPSON
two
station
printers used in this machine.
If
you
need
more
technical
service,please
call
our
service
branch.
Schematic
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.
MODEL KEYBOARD PRINTER SRAM TRANS
MAX 60 CR-802A
60 812A 120V 60Hz —
90 812A
160 802A
60
60 812A
90
230V 50Hz
Note:When
first
configuring
these
ECR,it’s
recommended
that
the
register
|
remain
powered
on
in
the
"REG"
mode
for
at
least
twenty-four
hours.
|
This
allows
the
Ni-Cad
battery,
which
maintains
the
memory
of
the
|
machine
while
the
power
is
off,
to
charge
completely.

1. SYSTEM INSTALLATION
1-1 START UP INSTRUCTIONS
STEP 1 Initial Clear
The Samsung ER-3715/3615(3715/4715/3740/4100, 3615/3640) Series may be
Initial
Cleared
at
any
time.The
Initial
Clear
procedure
may
be
used
to
clear keyboard lock-ups and constant error conditions.
This procedure will exit the current transaction/operation and clear
temporary memory buffers.An initial clear procedure will not effect register
programming,or clear previously stored totals in RAM memory.
Caution: An initial clear will cause balancing discrepancies if
performed in the middle of a transaction.
Turn the keylock to the " P " position and depress the " SUBTOTAL " key.
While holding the "SUBTOTAL" down, power the register off and back on.
The following receipt will be issued.
aeeeseeres
Sete ee
RNR RN NS
22009792
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STEP 2 Clearing Totals From Memory
The memory of the ER-3715/3615 series must be RAM Cleared before initial
programming may take place.
Memory RAM Clear is performed with the "C” key in
the S-Mode position.See the opposite diagram to
locate the S-Mode position.
Totals and counters may be reset to zero either
all at once ,or a section at a time. Using the
following as a guide ,choose the procedure for
clearing the desired section of memory.
TOTAL MEMORY RAM CLEAR (00 Key) S-Mode keylock position
RAM clearing the cash register erases all totals and installs the defau!t
program. Use this procedure the first time the cash register is programmed.

Selective Clearing of RAM Memory.
RESET ALL TOTALS & COUNTERS(CHECK Key)
This procedure will reset ALL totals and counters(Transaction numbers, Z-counter,
Grand total) while leaving register programming intact.
RESET GRAND TOTAL ONLY(CASH Key)
This procedure resets the Grand Total only, leaving all other programming ,totals
and counters intact.
Follow this procedure to clear totals from memory:
Unplug ECR.
Locate control lock key marked C.
Insert’ key into the control lock (See figure on preceding page) and turn
clockwise, past the position marked P,to the Master Clear position.This position
is not marked on the control lock, but the C key can travel to this position.
Choose the desired operation from those listed below. While holding the SPECIFIED
key down,plug-in the ECR.
CONTINUE TO HOLD THE KEY DOWN UNTIL THE RECEIPT PRINTER STOPS PRINTING AND THE DISPLAY
SHOWS 0.00.
KEY
C8%*19%92
eeveee*e?e#8e
0001 09
17255 G0
G6¥19%92
KKKKEMKE
00000000
Oco1 00
17655 09
CEX19%92
HERR EERE
11111171
0002 00
17.55 00
00 CHECK CASH
Total Memory Reset All Reset Grand Total (inmly
Ram Clear Total & Counters

STEP
3
Service
Mode
Diagnostics
The
Samsung
ER-3715/3615
series
offers
several
diagnostic
routines
which
are
formed
in
the
S-
or
Service
Mode.
Each
of
these
tests
require
the
"C"
key
be
turned
to
the
S-Mode
position.
See
Illustraion
on
page
5.
These are:
©
Printer/Display Test
Enter
1
and
press
the
CASH
TEND
Key.
The
register
will
cycle
completely
through
the
print
character
set
while
testing
the
display.
This
test
will
repeat
until
the
machine
is
unplugged
from
the
power
source.
Keyboard Test
Enter
2
and
press
the
CASH
TEND
key.One
at
a
time,press
all
the
keys
on
the
keyboard.
Each
key
will
show
its
location
code
on
the
display
as
it is
depressed.
Exit
the
keyboard
test
mode
by
pressing
the
"CLEAR"
key
twice.
Keylock Test
Enter
3
and
press
the
CASH
TEND
key.
The
corresponding
code
will
appear
on
the
display
as
the
"C"
key
is
rotated
from
position
to
position.
06%19%92
#
OTL
01kS
12k
012306
O1234A
012345171
012345611
O12 565.67 2
{123456780
X23456789X
BZ456789%%
R456789%.ST
W56789%.-
&789X.- OTL
HB9GXe- ONS
BOX¥e- O17 2R
R¥en- O12306
We- 0123468
@- 01234510
A 01234567!
012345672
4123456780)
X23456789X
BZ45678°%%
0003 00
1655 00
Printer Test

STEP 4 EPROM CHECK SUM
03x%x01%92
KER KEK K
Enter
4
and
press
the
CASH
TEND
key.The
EPROM
4100
.01
type
will
print
on
the
receipt.
eo
eeaee
nT
KRKKKKKK
0004 00
230535 90
@
Setting
the
Number
of
Departments
(3715/4715/3740
/3615
/3640
)
©
Locate
control
key
marked
C.
O
Insert
key
into
the
control
lock(see
page
3)
and
turn
clockwise
to
the
Master
Clear(S-Mode)
position.This
position
is
not
marked
on
the
control
lock,
and
only
the
key
will
travel
to
this
position.
© Enter the following KEY SEQUENCE
(XX) - [X/TIME] - [CASH/TEND]
XX :ER-3715/4715 (5,10,15)
ER-3740 (15,40)
ER-3615 (5,10,0[15])
ER-3640 (15,0[40])
Now, the SAMSUNG ECR is now ready to operate using the default progran.
The balance of programming procedures take place with the control lock in the ’P’
Position.

@
Setting
the
ER-4100’s
Department
Reporting
Order:
or....
The presence of shift keys for levels 1,2, &3, allow
"stacking" departments three to a key position. This
gives the ER-4100’s 117 department key locations
three levels each,or 351 departments in all.
Department
reporting
order
is
fixed
in
one
of
two
ways;
selectable
by
the
following
S-mode
programming
procedure:
RCPT
FEED
DETL
FEED
RCPT
ON/OFF || 84 9
82
83
Department key position # 1 shall
be occupied by departments 1,2, veueta
and 3, on levels 1,2, and 3. LEVEL 2 «
Department key position #2 shall ever3«
be occupied by departments 4,5,
and 6 on levels 1,2, and 3 ....
55 65 ;
56 86
10 |{57 = 49 J] 8
ww wo
.o @o
RCPT || DETL || RCPT || ‘45
FEED || FEED ||ON/OFF || 262 25
LEVEL
1
=
10
19
29
LEVEL
2
=
127 136
146
LEVEL3
=
244
4g
[]
253
4g
| |
26°
Departments
1-117
shall
occupy
key
positions
1-117,level
1.
Departments 118-234 shall occupy
20
137
ee
= rere) wo
ne
~~ i)
departments key positions 1-117, 236 ar
level 2, and so on. A
120 129
237 24F
w
"| Ny ~~
—_
nN
cy
~~.
Departments will always report in numeric order (1-351) and may be programmed
for Zero-skip.
—7T—

Programming Procedure:
@ Locate control key marked C.
@ Insert key into the control lock(see page 3) and turn clockwise to the
Clear (S-Mode) position. This position is not marked on the control
lock, and only the C key will travel to this position.
@ Enter the digit for desired department assignment order (see below)
press the "X/TIME” key, followed by the " CASH " key.
(0 OR 1) - [X/TIME] - [CASH]
0 = level 1 = 1-117, level 2 = 118 - 234, level 3 =235 - 351
(DEFAULT)
1
=
Key
position
1
=
Dept.
1,2,&
3
(levels
1,2,
&
3),
position
2
is
4,5,
&
6,
and so
on.
NOTE: Unless stated otherwise, all program operations default to "0" value.
The
balance
of
programming
procedures
take
place
with
the
control
lock
in
the
’P’
position.

1-2 General Warning
When
you
assemble
the
Key-Board
to
the
MAIN
PCB,
the
membrane
sheet
should
be
the
shape
as
fig.
(b)
If
you
assemble
as
Fig.
(a),
the
key
operations
may
incorrect
Upper
case
Upper
case
KBD ven
Membrane Membrane
sheet
MAIN
PCB
TR
MAIN
PCB
a - Lower case good Lower case
bad
(a) (b)
SIDE VIEW
1-3
TRANSFORMER
AND
FUSE
SPECIFICATION
TRANSFORMER _ SPECIFICATION
EUROPE
;
|
men
|
PRIMARY
SECONDARY
U.S.A.
-S.A.
SPECIFICATION
jo
v0.
|
SPECIFICATION
CODE
NO.
3-4 AC 19.5V
120V 60Hz 5-6 AC 9.5V
EUROPE 230V S50Hz
RED
BLUE
ORANGE
YELLOW
7-8 AC 26V |
9-10 AC Sv
FUSE SPECIFICATION (SECONDARY)
949 115003FHN B
949 145009THNA

2.CIRCUITRY
2-1 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,+20V
for
the
PRINTER
driving,
+5V
and
-30V
for
the
display.
The
BATTERY
applies
+3.6V
to
the
back-up
circuit.
1) VPP(+20V):MARK A ON PCB
The VPP
voltage
is
used
for
the
source
voltage
of
the
printer
driver
circuit.
The
AC
19.5V
is
rectified
by
BRIDGE
DIODE
BD2
and
it
is
regulated
by
the
capacitor
4700
pF
CEZ.
The
switching
circuit
is
composed
of
two
transistors
and
a
zener
diode.
2) VCC(+5V):MARK E ON PCB
The
VCC
is
used
for
the
power
source
of
the
system
logic.
The
AC
9.5V
is
rectified
by
the
BRIDGE
DIODE
BD1
and
regulated
by
the
capacitor
4700
pF
CE1.The
regulated
voltage
is
applied
to
the
input
of
the
regulator
MC7805.
The
output
voltage
of
the
MC7805
is
supplied
to
the
logic
and
+5V
terminal.
3) VF(+5V):MARK C ON PCB
The
VF
voltage
is
used
for
providing
the
power
to
the
filament
of
the
DIGITRON.
4) VDI(-30¥) :MARK B ON PCB
The
VDI
voltage
is
used
for
providing
to
GRID
and
PLATE
of
the
DIGITRON.

2-2 BATTERY CIRCUIT
When the AC power is turned on, the VCC voltage goes to the BATTERY through
D9,R30 for the charge.
When the AC power is turned off , the BATTERY voltage goes to the RAM and
RCT(real time clock).
VCC RAM VBT
pg
EK-04
220
R30 RTC VBT
(MARK F ON PCB)
= 3, 6V
oe
2-3 RESET AND POWER FAIL DETECTION CIRCUIT
The reset circuit prevents the CPU from starting to operate before the
system is fully powered-up and initialized.
The power fail detection circuit is used to save the state of the CPU and
the RAM data before the logic voltage of CPU goes down below the normal
voltage on the circuit such as main power off.
(RESET) (POWER FAIL)

2-4 DISPLAY CIRCUIT
This
circuit
is
composed
of
front
display
and
rear
display.
The
CPU
send
the
digit
and
segment
signals
to
the
LATCH(74HCT574).
These
latched
signals
are
amplified
by
the
drive
IC(IR2CO5)
or
TR.
These
amplified
signals
drive
the
digits
and
segments
of
the
DIGITRON.
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2-5
DRAWER
AND
BUZZER
CIRCUIT
The
drawer
solenoid
is
driven
for
100mS
by
giving
a
high-level
signal
to
the
LATCH(74HCT574).The
TR4(D288)
drive
the
drawer
solenoid.
The
drawer
open
sensor
is
a
optional
item
in
the
DRAWER.
This
sensor
switch
closes
for
the
drawer
open
condition,
the
CPU
detect
a
low-level
Signal
at
PIN
2.
The
BUZZER
is
actived
by
the
ON/OFF
state
of
the
CPU
PIN
6.
7
VPP
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2-6 KEYBOARD CIRCUIT
The
CPU
sends
a
scan
data
to
the
decoder
IC(74HCT138)
sequentially.
When
the
key
switch
is
depressed,
the
decoded
signal
goes
to
the
input
pin
of
the
buffer
IC20(74HCT541),
and
then
the
CPU
reads
a
return
data
from
the
output
pin
of
the
buffer
IC20(74HCT541).
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The
CPU(PINS)
sends
a
mode
scan
data
to
the
mode
switch,
and
then
the
CPU
reads
a
mode
return
data
from
the
output
pin
of
the
74HCT541.
CPU
33
|
65
|
89
|
73
|
41
|
49
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81
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2-7 REAL TIME CLOCK CIRCUIT
a crystal and
The clock circuit is composed of a timer IC19(RP5C15),
two capacitors. The CPU reads a time data from RP5C15, and writes a new
time data to the RP5SC15.
The address line means the content of the secs, mins, hours, etc.
VBT
30P cois
32.768
KHz
30P CCi5
40

2-8 PRINTER CIRCUIT
This machine uses the EPSON CR-812A or CR-802A Printer.
Validation
printing
:
only
CR-812A
20
column/1
line
Printing
speed
:
Approx.
2.6
lines/sec
Roll
size
:
44.5
mm(W),83mm(Max.
Diameter)
The
CPU
sends
a
high
signal
to
IC6
PIN19,
then
TR9 and
TR11
are
turned
ON.
As
a
result,the
motor
in
the
printer
starts
to
rotate.
The
printer
generates
the
timing
pulse
which
determines
the
position
of
the
character
wheel.The
CPU
detects
the
timing
pulse,compares
the
pulse
count
and
the
data
for
printing.If
the
count
meets
the
data,
the
CPU
sends
a
high
Signal
to
the
LATCH
IC(74HCT574)
during
the
next
pulse.
TR7
and
TR8
are
used
for
individual
printing,
such
as
JOURNAL
printing
or
RECEIPT
printing.
TR10
is
used
for
motor
break
circuit
which
immediately
stops
the
motor
when
the
motor
signal
is
turned
OFF.
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3 SPECIFICATION OF MAJOR COMPONENTS
3-1 CPU PORT DISCRIPTION(MCS-51 FAMILY)
I/O
I/O
FUNCTION
ADDRESS DATA BUS
P1.0
P1.1
8
2] 3
8
2
2
e
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Sl3is
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ADDRESS DATA BUS
I
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37 /0 ADDRESS DATA BUS
MODE CONTROL 1/0
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ADDRESS
DATA
BUS
is 0
ADDRESS LATCH
/INTO PGM STORE ENABLE
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(ADB ) ADDRESS BUS

3-2 PRINTER(CR-802A/CR-812A)
1)GENERAL SPECIFICATIONS
The EPSON Digital Printer CR-802 Series is designed as a printer to be used
exclusively for the cash register(ECR) and has the following features which
match the ECR more than the conventional printers.
1. Independent paper feeding of receipts and journals and quick feeding of
receipts are possible.
2. Stamp print and validation print can be conducted.
3. Inking system using ink rollers.
4. Validation sensor is equiped.The printer also features that the printing
system is a non-impact system and sound is "zero" when the printer is in
stand-by mode due to the intermittent motor drive.
2)Character print form(CR-802A/812A)
We
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Print wheel
number
—-17-

3-3
F.P.C
Terminal
Arrangement
Stamp trigger coil
J-side paper feeding trigger coil
R-side paper feeding trigger coil
J-side trigger magnet unit common wire (+)
J-side trigger magnet unit column No.
J-side trigger magnet unit column No.
J-side trigger magnet unit column No.
J-side trigger magnet unit column No.
J-side trigger magnet unit column No.
J-side trigger magnet unit column No.
J-side trigger magnet unit column No.
J-side trigger magnet unit column No.
J-side trigger magnet unit column No.
J-side trigger magnet unit column No.
Motor (+)/stamp trigger coil/paper feeding coil
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QUYGUOO
000000
H000GC
D000UU
YEQVVY
VUD VY
YOOUYY
stances ah (ea fs ee
AHHH O
common
wire
(+}
is
Motor
(—)
ig
R-side
trigger
magnet
unit
common
wire
(+)
20
aE
R-side
trigger
magnet
unit
column
No.
1
BO
TT
R-side
trigger
magnet
unit
column
No.
2
ite
OKT
4
)
R:side
trigger
magnet
unit
column
No.
3
200
Nite
“Si
i
it
col
4
R-side
trigger
magnet
unit
column
No
210
OKI
R-side
trigger
magnet
unit
column
No.
5
o
ma
220)
666060
“si
i
t
unit
col
No.
6
R-side
trigger
magnet
unit
column
No
230
Or
R-side
trigger
magnet
unit
column
No.
7
24
()
VOUS
0
R-side
trigger
magnet
unit
column
No.
8
250
440000
R-side
trigger
magnet
unit
column
No.
9
e
v
2
26
©)
600009
“si
i
et
unit
column
No.
10
R-side
trigger
magnet
uni
270
TIT
Empty
2O
Detector
power
source
(+5V)
¥g
Timing
signal
=
Detector
power
source
(GND)
4
NOTE:
For
the
arrangement
of
F.P.C.
terminals
are
numbered
31...
1
from
the
ink
roller
holder
ice.

3-4 GENERAL SPECIFICATIONS
IN2 (+) 7 8 | IN3(-)
A Vee
B YO
Cc Yi
KS74HCTLS138(3-Line
to
8-Line
Decoder/Multiplexer)
on
.
Gl |] Ys
Y7 Y5
GND ¥6
Function
TABLE
LOGIC
DIAGRAM
INPUTS
OUTPUTS
ENABLE! SELECT
Y4 Y5 Y6 Y7
3 OR.
ai “De
G2A
GzB
i
ENABLE d
INPUTS (
s DATA
QUTPUTS
SELECT
INPUTS
CRP Rr Rm Corer xe Ss
bp eee Cees ERO OEE ce co ea et . GR da i Ce Ee our oo XS Gor Lore Le Lor x. xX po ne Coo SE SS COO SU SE pon GR ae a) SE: SE ate Ee a A SE ae Ee fm Dt or ee Ee Ee a. ae Ee Ee Qtr Ls Lee eS
ae = 2 SD Soy Se ae 3 a EC a EE WS ee
x
L
H
H
H
H
H
H
H
H
* G2= G2A+G2B
—19—