SHARP ERA242U, ER-A242 Service Manual
SERVICE MANUAL
MODEL ER-A242
CONTENTS
CODE : 00Z
ERA242USME
ELECTRONIC
CASH REGISTER
(U version)
CHAPTER 1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
CHAPTER 2. OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CHAPTER 3. MASTER RESET AND PROGRAM RESET. . . . . . . . . 5
CHAPTER 4. HARDWARE DESCRIPTION . . . . . . . . . . . . . . . . . . . . 6
CHAPTER 5. TEST FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
CHAPTER 6. CAUTION TO BE USED WHEN CONNECTING
THE RS-232 CABLE. . . . . . . . . . . . . . . . . . . . . . . . . . 15
CHAPTER 7. CIRCUIT DIAGRAM AND PWB LAYOUT . . . . . . . . . 16
Parts marked with "!" are important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.
This document has been published to be used
SHARP CORPORATION
for after sales service only.
The contents are subject to change without notice.
CAUTIONS
THERE IS A RISK OF EXPLOSION IF THE BATTERY
IS REPLACED BY AN INCORRECT TYPE.
PROPERLY DISPOSE OF USED BATTERIES ACCORDING
TO THE INSTRUCTIONS.
ER-A242U
CHAPTER 1. SPECIFICATIONS
1. APPEARANCE
Front view Rear view
Customer display
Operator display
(Pop-up type)
Printer cover
Receipt paper
Power cord
Mode switch
Drawer
Drawer lock
Keyboard
RS-232C connector
Printer
Take-up spool
Print roller arm
Print roller
release rever
Inner cover
Paper roll cradle
Paper positioning
guides
2. RATING
ER-A242
Weight 16.3lb (7.4kg)
Dimensions 13.0 (W) x 16.9 (D) x 11.0 (H) inches
Power source AC 120V (m 10%), 60Hz
Power consumption Stand-by 7.7W, Operating 30W (max.)
Working temperature 0°C~40°C (32°F to 104°F)
(330 (W) x 428 (D) x 280 (H) mm)
■Key names
KEY TOP DESCRIPTION
2 Paper feed key
RA Received-on account key
RCPT/PO After receipt issue key/Paid out key
VOID Void key
ESC Error escape key
CONV Exchange (Currency Conversion)
%1, %2 Percent 1 and 2 key
RFND Refund key
- Markdown key
@/FOR Multiplication key
• Decimal point key
CL Clear key
0-9,00 Numeric Keys
PLU/SUB PLU code entry key
DEPT# Department code entry key
DEPT SHIFT Department shift key
CLK# Clerk code entry key
Dept1-32 Department 1- 32 keys
TAX Manual tax key
Tax 1 SHIFT Tax 1 shift key
Tax 2 SHIFT Tax 2 shift key
AUTO Automatic entry key
CHK Check key
CH Charge key
MDSE SBTL Merchandise subtotal key
#/TM/SBTL Non-add code/Time/Subtotal key
CA/AT/NS Cash/Amount tender/Non Sales key
4. MODE SWITCH
3. KEYBOARD
1) KEYBOARD LAYOUT
Type Normal keyboard
Key position STD/MAX 53
Key pitch 19 (W) x 19 (H) mm
Key layout Fixed type
2) KEY LIST
■Keyboard layout
PLU
CL
00
/SUB
4
3
2
1
RCPT
/PO
VOID
DC
ESC
BS
CONV
NUMBER
–
RFND
%1RA
%2
SHIFT
SPACE
@/
FOR
•
789
456
123
0
Note: The small characters on the bottom or lower right in each key
indicates functions or characters which can be used for character
entries for text programming.
DEPT
DEPT
#
A
20
B
8
19
C
7
18
D
6
17
E
5
CLK
SHIFT
F
24
G
12
23
H
11
22
I
10
21
J
9
#
P
K
28
32
L
Q
16
27
31
M
R
15
26
30
N
S
14
25
29
O
T
13
AUTO
TAX
TAX1
SHIFT
CHK
MDSE
SBTL
X
U
TAX2
SHIFT
Y
V
CH
Z
W
#/TM
SBTL
CA/AT/NS
ER-A242U SPECIFICATIONS
1) LAYOUT
• Rotary type
MA
OP
REG
OP
X/Z
PGM
MGR
X
1/Z1
X2/Z2
OFF
VOID
The mode switch can be operated by inserting one of the two supplied
mode keys - manager (MA) and operator (OP) keys. These keys can be
inserted or removed only in the “REG” or “OFF” position.
– 1 –
Manager key (MA)
Operator key (OP)
MA
OP
The mode switch has these settings:
OFF: This mode locks all register operations. (AC power turns off.)
No change occurs to register data.
OP X/Z: To take individual clerk X or Z reports, and to take flash
reports.
It can be used to toggle receipt state “ON” and “OFF” by
pressing he [RCPT/PO] key.
REG: For entering sales.
PGM: To program various items.
VOID
: Enters into the void mode. This mode allows correction after
finalizing a transaction.
MGR: For manager’s entries. The manager can use this mode for an
override entry.
X1/Z1: To take the X/Z report for various daily totals.
X2/Z2: To take the X/Z report for periodic (weekly or monthly) consol-
idation.
5. DISPLAY
1) OPERATOR DISPLAY
Display device: LED numeric display
Number of line: 1 line
Number of positions: 10 positions numeric display
Color of display: Yellow / Green
Character form: 7 segment + DP
Character size: Numeric 14.2 (H) x 7.9 (W) mm
Layout:
0.1.2.3.4.5.6.7.8.9.
2) CUSTOMER DISPLAY
Display device: LED
Number of line: 1 line
Number of positions: 7 positions
Color of display: Yellow / Green
Style: Pop up type
Character form: 7 segment + Dp
Character size: 14.2mm (H) x 7.9mm (W)
Layout:
3.4.5.6.7.8.9.
Operator display Customer display (Pop-up type)
PLU/SUB
DEPT REPEAT
RCPT
OFF
Clerk code
NUMBERSHIFT
DC
Amount: Appears in the far-right eight (max.) positions. When the
amount is negative, the minus symbol “-” appears before the
amount.
Number of repeats for repetitive registrations:
The number of repeats is displayed, starting at “2” and incremental with each repeat. When you have registered ten
times, the display will show “0.” (2 3 3
.....
9 3 0 3 1 3 2
Receipt function status:
The indicator “_” appears in the RCPT OFF position when
the receipt function is in the OFF status.
Time: Appears in the far-right six positions (hour-minute - ”A” or
hour-minute - ”P”) in the OP X/Z, REG, or MGR mode. “A” is
displayed in the morning (AM), and “P” in the afternoon
(PM). In the REG or MGR mode, press the [#/TM/SBTL] key
to display the time.
■Machine state symbols
: Appears during programming.
: Appears when an error is detected.
: Appears when the subtotal is displayed or when the amount
tendered is smaller than the sales amount.
: Appears when the [CONV] key is pressed to calculate a subto-
tal in foreign currency.
: Appears when a transaction is finalized by pressing the [CA/AT/
NS], [CHK] or [CH] key.
: Appears when the change due amount is displayed.
: May appear in the far-left three positions at the timing of key
entry when the electronic journal (EJ) memory is full. (Depending on programming.)
: Appears when the voltage of the installed batteries is under the
required level. You must replace with new ones within two days.
: Appears when the batteries are not installed, or the installed
batteries are dead. You must replace with new ones immediately.
: May appear right below the eighth and ninth places at the timing
of finalization of a transaction when the electronic journal (EJ)
memory is nearly full.
Also appears right below the tenth place when power save
mode is effective.
: Appears when the print roller arm is not locked.
: Appears when the paper is not set or out.
...
)
ER-A242U SPECIFICATIONS
– 2 –
Segment
Display
position
Amount 1-8
Minus sign 2-10 -: Floating
Error 8-10 Exx:xx = error code
PGM Mode 10 P
CASH, CHECK,
CHARGE
SUB TOTAL/
short tender
Change 10 C: Light up when ever the change
Currency
Conversion
Department 9-10 No zero-suppressed
PLU 7-10 No zero-suppressed
Repeat 8 Endless count, starting from 2.
Receipt OFF 9 _
DC _: Double size character entry status
SHIFT _: Shift character entry status
NUMBER _: Number character entry status
Clerk No. 2, 3 -xx-: clerk number
EJ FULL 8-10 E-E: Light up when EJ memory is
Low Battery 10 L:
No Battery 10
10 F: Light up when a registration is
10 o
10 c: Light up whenever the foreign
finalized by depressing CASH,
CHECK, CHARGE key
due amount appears in the display.
amount appears in the display.
FULL at the timing of key entry (by
PGM selection).
:
L
Description
Decimal Point
Display
position
Decimal point 7-1
TAB 4-1
EJ near full 8, 9 (by PGM selection)
Description
6. PRINTER
1) Printer
• Part number : M-T53II
• NO. of station : 1 (Receipt or journal)
• Validation : No.
• Printing system : Line thermal
• No. of dot : 288 dots
• Dot pitch : Horizontal 0.167mm
Vertical 0.167mm
• Font : 10 dots (W) u 24 dots (H)
• Printing capacity : max. 24 characters/Line
• Character size : 1.67mm (W) u 4.17mm (H) at 10 u 24 dots
• Print pitch : Column distance 2.0mm
Row distance 5.21mm
• Print speed : Approximate 60mm/s (Approximate 12 l/s)
• Paper feed speed : Approximate 60mm/s (Approximate 12 l/s)
(Manual feed) : Approximate 60mm/s (Approximate 12 l/s)
• Reliability : Mechanism LIFE 6 million lines used to highquality thermal paper
• Paper end sensor : Set up
• Cutter : Manual Cutter
• Near end sensor : No
2) Paper
• Paper rolldimension: 2.25 m 0.02 inch
57.5 m 0.5mm in width
Max. 3.15 inch
Max. 30mm in diameter
• Paper quality: High-quality thermal paper
paper thickness: 0.06 to 0.08mm
Nihon seisi thermal paper TF50KS-E2C
KANZAN thermal paper: KF50
KSP thermal paper: P350
3) Logo stamp
• No
4) Printing area
Number of thermal head heater elements 288 dots
ER-A242U SPECIFICATIONS
– 3 –
(4.75) (4.75)48 (288 dots)
print area
(max.24 characters)
0.167
57.5±0.5
(Paper dimension)
(units : mm)
7. DRAWER
8. BATTERY
[OUTLINE]
• Standard equipment: Yes (1)
• Max. number of additional drawers: 0
• The drawer consists of:
1) Drawer box (outer case) and drawer
2) Money case
3) Coin case
4) Lock (attached to the drawer)
[SPECIFICATION]
1) DRAWER BOX AND DRAWER
Model name of
the drawer box
Size (mm)
Material Metal
Bell —
Release lever Standard equipment: situated at the bottom
Drawer open
sensor
Separation from
the main unit
SJ423
420 (W) x 427 (D) x 114 (H)
—
—
2) MONEY CASE
Separation from the drawer Allowed
Separation of the bill compartments from the
coin compartments
Bill separator Allowed
Number of compartments 5B/6C
Layout:
Allowed
1) MEMORY BACK UP BATTERY
For memory back up, the dry battery AA (3 pieces) are needed.
1. Memory holding time:
Approx. 1 year after New dry batteries are installed.
2. Battery exchange method:
When the low battery symbol “L” lights up, replace the batteries (3
AA) by the following method;
1) Power on the ECR.
2) Mode switch turn to “REG” mode.
3) Remove the OLD dry batteries (3 pieces).
4) Insert the NEW dry batteries (3 pieces).
5) Confirm the low battery symbol “L” is off.
2) LOW BATTERY
Low battery indication will appear on the left side of display when the
battery voltage is low.
CASE 1: When any numeric entry & any item entry is not done or just
after finalization.
The machine can indicate the low battery condition. (Always)
CASE 2: When numeric entry or item entry is done.
Battery condition will not appear.
Exceptionally, when the power is restored after a power failure, the
low battery condition will appear on the display only when the battery is low.
And the indicator will disappear after any key entry.
[Display sample]
“ 0.00”: Battery is OK.
“L 0.00”: Low battery (You have to change the batteries.)
“
L 0.00”: No battery (You have to change the batteries immediately.)
After finalization
“F 12.34”: Battery is OK.
“L 12.34”: Low battery. (“L” indicate instead of “F”.)
“
L 12.34”: No battery. (“L” indicate instead of “F”.)
5B/6C
3) LOCK (LOCK KEY : LKGIM7331BHZZ)
Location of the lock: Front
Method of locking and unlocking:
To lock, insert the drawer lock key into the lock
and turn it 90 degrees counter clockwise.
To unlock, insert the drawer lock key and turn it 90
degrees clockwise.
Key No: SK1-1
k
c
o
SK1-1
L
Note: “NO BATTERY”: When the “NO BATTERY” is display, the mas-
ter reset is executed at the timing of “POWER
ON” after the “POWER OFF”.
k
c
o
l
n
u
ER-A242U SPECIFICATIONS
– 4 –
CHAPTER 2. OPTIONS
1. OPTIONS (NO)
2. SERVICE OPTIONS (NO)
3. SUPPLIES
NO NAME PARTS CODE
1 Thermal roll paper TPAPR6656RC05 BA 5 ROLLS/PACK 70 φ
PRICE
RANK
4. SPECIAL SERVICE TOOLS
NO NAME PARTS CODE
1 RS-232 Loop-back connector UKOG-6705RCZZ BC
PRICE
RANK
CHAPTER 3. MASTER RESET AND PROGRAM RESET
1. MASTER RESETTING
Master resetting clears the entire memory and resumes initial values.
Master resetting can be accomplished by using the following procedure:
Procedure A: 1) Plugin the AC cord to the wall outlet.
2) Set the mode switch to REG position.
3) Let the ECR be witout the memory backup battery.
4) Unplug the AC cord from the wall outlet.
5) Wait over 1 minute for discharging.
6) Plugin the AC cord to the wall outlet.
The master reset can also be accomplished in the following case.
In case power failure occurs when the machine has no battery
attached to it, the master reset operation is automatically performed
after the power has been restored.
(This is because if power failure occurs with no battery attached to
the machine, all the memories are lost and the machine does not
work properly after power recovery; this requires the master reset
operation.)
2. PROGRAM RESETTING
(INITIALIZATION)
This resetting resumes the initial program without clearing memory.
This resetting can be operated at below sequence in PGM mode.
Procedure: 1) Unplug the AC cord from the wall outlet.
2) Wait over 1 muinite for discharging.
3) Set the mode switch to the PGM position.
4) While holding down the FEED key, plugin the AC
cord to the wall outlet.
Note: In case power failure occurs when the machine has no battery
attached to it, the master reset operation is automatically performed after the power has been restored.
DESCRIPTION
DESCRIPTION
ER-A242U OPTIONS
– 5 –
CHAPTER 4. HARDWARE DESCRIPTION
1. HARDWARE BLOCK DIAGRAM
POWER SUPPLY
CPU
Data bus
Address
bus
DRIVER , SENSOR
ROM : 256K Byte
RAM : 20K Byte
STANDARD
DRAWER.
RAM
128K Byte
PRINTER
M-T53II
PAPER TAKE
UP MOTOR
4 to 16
DECORDER
KEY SCAN SIGNAL
KEY RETURN SIGNAL
RS232C
DRIVER
POPUP
Seg. DRIVER
FRONT
LED
Dig. DRIVER
KEYBOARD
MODE SWITCH
RS232
ER-A242U HARDWARE DESCRIPTION
– 6 –
TRANSFORMER
PQ1CG2032
/POFF detect point
PQ1CG2032
ON/OFF Control (MODE SW)
LM2574
+ Tr.
VH, VP (8V)
PRINTER HEAD, MOTOR
PAPER TAKEUP MOTOR
ON/OFF Control (MODE SW,
/POFF, CPU P105)
2. DESCRIPTION OF MAIN LSI’S
2-1. CPU (M30624FGAFP)
1) Pin configuration
D6
D5
D4
D3
D2
D1
D0
DTS
LATCH
P105
P104
P103
Vref
P101
GND
TH
VDD
VDD
P97
9998979695949392919089888786858483828180797877
P96
P95
P94
P93
P92
P91
P90
VDD
GND
XCIN
XCOUT
/RESET
XOUT
GND
XIN
VDD
VDD
CTCRL
/FRDY
P-OFF
MOTOR
BUZ1
P77
P76
P75
100
AN4
AN3
AN2
AN1
AN0
SIN4
VREF
AVSS
AVCC
1
SOUT4
2
CLK4
3
TB4IN
4
TB3IN
5
SOUT3
6
SIN3
7
CLK3
8
BYTE
9
CNVss
10
XCIN
11
XCOUT
12
/RESET
13
XOUT
14
Vss
15
XIN
16
Vcc
17
NMI
18
INT2
19
INT1
20
INT0
21
TA4IN/U
22
TA4OUT/U
23
TB3IN
24
TBEOUT
25
TA2INW
TA2OUTW
TA1IN/V
TA1OUT/V
26272829303132333435363738394041424344454647484950
P74
P73
CLK
TB5IN
P71
TB5OUT
TXD1
P67
DAT
M30624FGAFP
RXD1
CLK1
CLKS1
P66
P64
/FRES
AN5
TXD0
FSD
AN7
AN6
RXD0
CLK0
FRD
FSCK
D0
/RTS0
DR1
D1
/RDY
/RDY
D2
ALE
HOLD
D3
/HOLD
VCC
D4
/HLDA
NC
D6
D5
CBCLK
/RD
NC
/RD
D7
D7
/BHE
NC
V0 24V
Battery
P11
P10
D9
D8
D13
D14
D15
VSS
VCC
/WR
/CS3
/WR
/CS3
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
VLED 5.7V
VCC 5V
VDD 5V
PH1
P13
P12
76
D12
D11
D10
75
74
73
A0
72
A1
71
A2
70
A3
69
A4
68
A5
67
A6
66
A7
65
64
A8
63
62
61
A9
60
50
58
57
56
55
54
53
52
51
/CS2
/CS1
/CS0
BUSY
/RAS1
/ROS1
Drawer
PH2
PH3
PH4
A0
A1
A2
A3
A4
A5
A6
A7
GND
A8
VDD
A9
A10
A11
A12
A13
A14
A15
A16
A17
NC
NC
2) Pin description
Pin
SYMBOL
No.
1 SOUT4 P96 In Key IN
2 CLK4 P95 In Key IN
3 TB4IN P94 In Key IN
4 TB3IN P93 In Key IN
5 SOUT3 P92 In Key IN
6 SIN3 P91 In Key IN
7 CLK3 P90 In Key IN
8 BYTE VDD In VDD
9 CNVss CNVss In Normal : L Booting : H
10 XCIN XCIN In Calender clock :32.768KHz
11 XCOUT XCOUT In Calender clock :32.768KHz
12 /RESET /RESET In Reset
13 XOUT XOUT Out Open
14 Vss Vss In Vss
15 XIN XIN In System clock
16 Vcc VDD In VDD
17 NMI P85 In Not used
18 INT2 P84 Out PRINTER/STB2
19 INT1 /RDY In NU FMC (/RDY)
20 INT0 P-OFF In Power off
21 TA4IN/U MOTOR Out Paper take up motor drive
22 TA4OUT/U BUZ1 Out Buzzer drive
23 TB3IN P77 In RS232 :DR
24 TBEOUT P76 In RS232 :CS
25 TA2INW P75 In RS232 :CD
26 TA2OUTW P74 Out RS232 :ES
27 TA1IN/V P73 Out Drawer drive 2
28 TA1OUT/V CLK2 Out Printer data clock
29 TB5IN P71 Out NU FMC (BUSY)
30 TB5OUT TXD2 Out Print data
31 TXD1 P67 Out RS232 :SD
32 RXD1 P66 In RS232 :RD
33 CLK1 /FRES Out NU FMC (/FRES)
34 CTS1/RTS1 P64 Out RS232 :RS
35 TXD0 FSD Out FMC :Send data
36 RXD0 FRD In FMC :Receive data
37 CLK0 FSCK Out FMC :Shift clock
38 /RTS0 DR1 Out Drawer drive 1
39 CLKOUT /RDY In /RDY (CGROM)
40 ALE NC Out NOT USE
41 /HOLD /HOLD In /BOOT MODE
42 /HLDA NC Out NOT USE
43 CBCLK BCLK Out BCLK
44 /RD /RD Out Read
45 /BHE NC Out NOT USE
46 /WR /WR Out Write
47 /CS3 CS3 Out Display segment latch
48 /CS2 /CS2 Out Chip select :for RAM
49 /CS1 /CS1 Out EPM Control
50 /CS0 /CS0 Out Chip select : for ROM
51 A19 A19 Out Address bus :19
52 A18 A18 Out Address bus :18
SIGNAL
NAME
In/
Out
Function
ER-A242U HARDWARE DESCRIPTION
– 7 –
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