Page 1
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.
Page 2
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
Page 3
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
Page 4
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 –
Page 5
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)
Page 6
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 –
Page 7
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 –
Page 8
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 –
Page 9
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 –
Page 10
Pin
No.
SYMBOL
SIGNAL
NAME
In/
Out
Function
53 A17 A17 Out Address bus :17
54 A16 A16 Out Address bus :16
55 A15 A15 Out Address bus :15
56 A14 A14 Out Address bus :14
57 A13 A13 Out Address bus :13
58 A12 A12 Out Address bus :12
59 A11 A11 Out Address bus :11
60 A10 A10 Out Address bus :10
61 A9 A9 Out Address bus :9
62 VCC VDD In VDD
63 A8 A8 Out Address bus :8
64 VSS VSS In VSS
65 A7 A7 Out Address bus :7
66 A6 A6 Out Address bus :6
67 A5 A5 Out Address bus :5
68 A4 A4 Out Address bus :4
69 A3 A3 Out Address bus :3
70 A2 A2 Out Address bus :2
71 A1 A1 Out Address bus :1
72 A0 A0 Out Address bus :0
73 P17 ENA2 Out Paper feed motor :ENA2
74 P16 ENA1 Out Paper feed motor :ENA1
75 P15 IN2 Out Paper feed motor :IN2
76 P14 IN1 Out Paper feed motor :IN1
77 P13 P13 Out Key/Display
78 P12 P12 Out Key/Display
79 P11 P11 Out Key/Display
80 P10 P10 Out Key/Display
81 D7 D7 InOut Data bus :7
82 D6 D6 InOut Data bus :6
83 D5 D5 InOut Data bus :5
84 D4 D4 InOut Data bus :4
85 D3 D3 InOut Data bus :3
86 D2 D2 InOut Data bus :2
87 D1 D1 InOut Data bus :1
88 D0 D0 InOut Data bus :0
89 AN7 STB1 Out Printer head strobe
90 AN6 LATCH Out Printer data latch
91 AN5 P105 Out Printer head voltage ON
92 AN4 P104 Out CG ROM Bank
93 AN3 P103 In VBAT
94 AN2 Vref In NU Vret
95 AN1 P101 In Printer head voltage check
96 AVSS VSS In VSS
97 AN0 TH In
Print head temperature check
98 VREF VDD In VDD
99 AVCC VDD In VDD
100 SIN4 P97 In Key IN
3. CLOCK GENERATOR
1) CPU
15
XIN
13
XOUT
CPU
XCOUT
Two oscillators are connected to the CPU.
The basic clock X2 is supplied from a 12MHz oscillator.
If the CPU was not operating properly, the signal does not appear on
this line in most cases.
The sub-clock X1 generates 32.768KHz which is primarily used to
update the internal RTC (real time clock).
During the standby mode, it keeps oscillating to update the clock and
monitoring the power recovery.
XCIN
12MHz
R
C
18P
330
X1
32.768KHz
C
27P
11
10
4. RESET CIRCUIT
VDD
MODE SWITCH
SRV' position
R
R
S-80928ANMP
C
(1) When the mode switch is placed in the “SRV” position, the reset sig-
nal is sent to the CPU to reset the hardware.
(2) When VDD t 2.8V, a reset signal is outputted from the reset IC.
(S-80928ANMP)
VDD
IC
R
C
11
CPU
/RESET
5. P-OFF CIRCUIT
VCC VLED
R15
2.7K
1uF/50V
R16
9.1KG
C14
R17
0
8
3
2
IC4A
4
BA10393
R18
3.9K
R20
2.7K
R19
56K
1
BA10393
8
5
7
C15
0.1uF
/POFF
6
4
IC4B
ER-A242U HARDWARE DESCRIPTION
– 8 –
ZD4
MTZJ5.1B
P-OFF
Page 11
The P-OFF signal detects two signals by two comparators and sent to
the CPU.
V0 (24V) signal: If the power voltage V0 (24V) falls bellow the specified
level, the P-OFF signal is driver to LOW by the comparator ICAA.
VLED signal: If the LED/Logic power voltage VLED falls below the
specified level, the P-OFF signal is driven to LOW by
the comparator IC4B.
6. MEMORY CIRCUIT
1) Address map
00000h
00400h
05400h
06000h
08000h
28000h
40000h
C0000h
FFFFFh
2) RAM control
CPU
CPU internal RAM
20kbytes
Segment latch address
External S-RAM : 128kbytes
(128kbytes area)
CPU internal ROM
256kbytes
Power supply circuit
or
Dry battery
VDD
VCC
VCC
A0-A16
D0-7
10K
150pF
10K
10K
A0-A16
D0-7
/CS2
/RD
/WR
/CS2
/RD
/WR
/CS3 area
06000h - 07FFFh
/CS2 area
08000h - 27FFFh
CS2
A0-A16
VCC
I/O0-7
/CS1
S-RAM
128K byte
IC
/OE
/WE
VDD
0.1M
11
7. PRINTER CONTROL CIRCUIT
1) Paper feed motor circuit
CPU
P14
P15
P16
P17
VCC
IC13
LB1838M
Stepping motor control
The 2-phase, bi-polar stepping motor is driven at a constant voltage by
LB1838M (made by SANYO).
1 step: 0.087mm
1 dot: 2 steps
CPU port
No. CPU port Signal used
76 P14 IN1
75 P15 IN2
74 P16 ENA1
73 P17 ENA2
Drive step
Driver IC input
(CPU output)
STEP
IN1 IN2 ENA1 ENA2
1LLH H H H L L
2HLHHL HH L
3HHH H L L H H
4LHH H H L L H
2) Print circuit
Thermal head configuration
As shown in the equivalent circuit in the figure, thermal head consists of
heating elements and head drivers which drives and controls those
heating elements.
The serial print data input through the DATA IN (D1) is transferred to
the shift register synchronizing with the CLOCK (CP) and stored in the
latch register by the LATCH (LA) signal.
The head conduction signals (print commands 1 ~ 6) turn the gate on to
conduct the heating element corresponding to the print data.
VH
10uF/50V
A
/A
B
/B
MOTOR
Motor drive signal
A
(OUT1)B(OUT3)/A(OUT2)/B(OUT4)
ER-A242U HARDWARE DESCRIPTION
– 9 –
Page 12
Thermal head block daigram
Dot #1Dot #288
Latch register
Shift register
5,6,18,19
9,10,14,15
11
13
7
16
17
12
Connector
Thermal head strobe terminals
STB No. Dot No. Number of dots
1 1 ~ 144 144
2 145 ~ 288 144
VP
GND
STB1
STB2
LAT
CLK
DAT
VCC
9. DRAWER DRIVE CIRCUIT
V0
F6
CPU
/RTS0
DR1
(38pin)
T400mA/250V
DIA
IN4002
R102
1K
C80
FB2
0.1u
CN6
FB3
Q9
2SD2212
FB2, FB3: Jumper Wire
DRAWER
When the DR1 signal from the CPU is HIGH, Q9 is turned on to operate
the solenoid.
10. BUZZER DRIVE CIRCUIT
8. PAPER TAKE UP MOTOR DRIVE CIRCUIT
VH
CPU
TA4IN/U
MOTOR
(21pin)
R101
1K
C79
CN5
Q13
2SD2212
M
MOTOR
When the MOTOR signal from the CPU is HIGH, Q1 is turned on to
operate the motor.
11. KEYBOARD CIRCUIT
P10-13
P10-13
P10-13
P92-97
HC138
HC138
/S0-7
/S8-9
/S0-9
P92-97
Key
Matrix
/S0-7
Mode
Switch
CPU
TA4OUT/U
22pin
470
R86
BZ
BZ
When the pulse signal (about 4KHz) is generated from the CPU, the
buzzer sounds.
/S0-9
/S1
Paper
feed key
/S3 /S4
Head up
sensor
Paper end
sensor
/S9
RS232
signal
/CI
/S0 - 9
P90
CPU
P91
D0-7
/CS3
D0-7
/CS3
P91
74HC374
a,b,c,d,e,f,g,dp
A',B',C',D',E',F',G',DP'
Four P10-13 signals from the CPU are converted into 16 strobe signals by two 74HC138 for use in various functions.
ER-A242U HARDWARE DESCRIPTION
– 10 –
Front
display
G1',G2',
G3'G4',G5',
G6',G7
Pop-up
display
Page 13
1) Keyboard
Scan signal: 10 /S0-9 signals
Return signal: 6 P92-97 signals
The keys are read by the key matrix following the above signals.
2) Mode switch
Scan signal: 8 /S0-7 signals
Return signal: 1 P90 signal
The positions are read by the above signals.
Scan
signal
Mode
switch
position
/S0 /S1 /S2 /S3 /S4 /S5 /S6 /S7
SRV PGM (OFF) TIME REG MGR X1/Z1 X2/Z2
5) Paper end sensor
Scan signal: 1 /S4 signal
Return signal: 1 P91 signal
The paper end sensor state is read by the above signals.
Receipt near end sensor End detected End not detected
P91 Low High
6) RS232/CI signal detection
Scan signal: 1 /S9 signal
Return signal: 1 P91 signal
The RS232/CI signal is detected by the above signals.
RS232 /CI signal /CI signal detected /CI signal not detected
P91 Low High
3) Paper feed key
Scan signal: 1 /S1 signal
Return signal: 1 P91 signal
The paper feed key is read by the above signals.
4) Head up sensor
Scan signal: 1 /S3 signal
Return signal: 1 P91 signal
The Head up sensor state is read by the above signals.
Head up sensor Head up detected Head up not detected
P91 Low High
12. RS232 CIRCUIT
CPU
P91
/S9 Q14
D16
P75
P66
P67
P74
P77
P64
P76
R2OUT
R1OUT
T3IN
T2IN
HIN211
R4OUT
T1IN
R5OUT
R3OUT
IC14
7) Display
Scan signal: 10 /S0-9 signals
The above 10 scan signals are used as the following digit signals.
Digit signal:
Scan signal /S0 /S1 /S2 /S3 /S4 /S5 /S6 /S7 /S8 /S9
Digit signal:
Front
Digit signal:
Pop-up
Segment signal : Segment signals: a, b, c, d, e, f, g, and DP are output
R2IN
R1IN
T3OUT
T2OUT
R4IN
T1OUT
R5IN
R3IN
G1’ G2’ G3’ G4’ G5’ G6’ G7’ G8’ G9’ G10
G1’ G2’ G3’ G4’ G5’ G6’ G7’
by the IC:74HC374, using the data bus signal:D0-7
from the CPU as an input signal and the chip select
signal:/CS3 as a latch signal.
CD
RD
SD
ER
1
2
3
4
5
DR
RS
CS
CI
6
7
8
9
CD
RD
SD
ER
GND
DR
RS
CS
CI
D-SUB 9pin connector
’
The signals from the CPU are converted by the HIN211 into the RS232 level to input and output them.
ER-A242U HARDWARE DESCRIPTION
– 11 –
Page 14
CHAPTER 5. TEST FUNCTION
1. TEST ITEMS
Key turned to PGM. The test items are as follows:
NO. Code Description
1 100 Display buzzer test
2 101 Key code
3 102 Printer test
4 104 Keyboard test
5 105 mode switch test
6 106 Printer sensor test
7 107 Clock display test
8 110 Drawer 1 open & sensor test
9 120 External RAM test
10 121 CPU internal RAM test
11 140 CPU internal ROM test
12 160 AD conversion port test
13 500 RS232C test
14 550 Sleep mode test
2. DESCRIPTION OF EACH DIAGNOSTIC
PROGRAM
2) KEY CODE
1 Key operation
RCPT/PO101
2 Test procedure
Display
KEY CODE
3 Check that:
KEY code: Every time a key is pressed, the code of that key is displayed as a decimal number.
When a key is pressed twice or pressed in an incorrect manner, --will be displayed.
4 End of testing
You can exit the test mode by turning the mode switch to a position
other than the SRV mode. The printer prints as follows:
101
3) PRINTER TEST
1 Key operation
RCPT/PO102
1) DISPLAY BUZZER TEST
1
Key operation
RCPT/PO100
2
Test procedure
Display at operator side 1.2.3.4.5.6.7.8.9.0.
Display at front side 4.5.6.7.8.9.0.
The decimal point will shift in steps of 1 digit from the lower digit to
the upper (every 200 m sec).
After that, all segments turn on (about 1 sec)
Display at operator side 8.8.8.8.8.8.8.8.8.8.
Display at front side 8.8.8.8.8.8.8.
This mode is repeated.
At the same time, the buzzer sounds continuously.
3
Check that:
A) Each position is correctly displayed.
B) The brightness of each number is uniform.
C) The buzzer sound is normal.
4
End of testing
You can exit the test mode by pressing any key. The following is
printed.
100
2 Test procedure
Display 1234567890
ZZZZZZ ----------------ZZZZZ
ZZZZZZ ----------------ZZZZZ
ZZZZZZ ----------------ZZZZZ
3 lines of 24 Z's are printed.
3 Check that:
The print is free from contamination, blur, and uneven density.
4 End of testing
The test will end automatically.
4) KEYBOARD TEST
1 Key operation
RCPT/PO104
2 Test procedure
The keyboard is checked using the sumcheck data of the key code.
Display 104
KEY CODE
3 Check:
A) The content of completion print
ER-A242U TEST FUNCTION
– 12 –
Page 15
4
End of testing
When the test ends normally 104
When an error occurs E- ~ - 104
Note: Calculation of key sumcheck data
The hard code (hexadecimal number) at the position (excluding
feed key) where there is an input data contact is added.
However, the end key (CA/AT/NS) is not added.
This data to which hard codes have been added is converted into
a decimal number value, which will become the sumcheck data
that will be entered when the Diag is started.
3
Check that:
“-” blinks and the clock counts up.
4
End of testing
When any key is pressed, the date and time are printed and the test
mode will terminated.
Display 1 0 6 XXXXXX - XXXXXX
year month day hour min sec
5) MODE SWITCH TEST
1
Key operation
RCPT/PO105
2
Test procedure
Display 105 X
MODE:
x :
3
4
_PGM_VOID_OFF_OP X/Z_REG_MGR_X1/Z1_X2/Z2____PGM
1293 456 7 1
The above x must be read in the correct order. (If the contact is
open, 9 will be displayed.)
Check:
The display during testing and the content of the completion print.
End of testing
When the test ends normally: 105
When an error occurs: E- ~ - 105
6) PRINTER SENSOR TEST
1
Key operation
RCPT/PO106
2
Test procedure
Check the status of paper end sensor and head up sensor.
7-segment display: 106 XY
3
Check the following:
X:1 - Paper present Y:1 - Head DOWN
O - Out of paper O - Head UP
4
End of testing
You can exit the test mode by pressing any key and the printer prints
the following:
106
7) CLOCK TEST
1
Key operation
RCPT/PO107
2
Test procedure
Displayed digit:
7-segment display:
8 7 6 5 4 3 2 1
hour min sec
Blinks at an interval of 0.5 sec.
8) DRAWER 1 OPEN AND SENSOR TEST
1
Key operation
2
Test procedure
3
Check that:
A) The drawer opens normally.
B) The sensor correctly indicates the status of the drawer 1.
*On the ER-A242, “C” (CLOSED) is always displayed.
4
End of testing
You can exit the test mode by pressing any key. The printer prints
the following.
9) EXTERNAL RAM TEST
1
Key operation
2
Test procedure
The standard 128 Kbyte RAM is checked.
The contents of the memory are lost after this test.
RAM(08000H ~ 27FFFH area) is tested in the following procedure:
a) Data in the test area is stored.
b) Write “00H”
c) Read and compare “00H” and then write”55H”
d) Read and compare “55H” and then write”AAH”
e) Read and compare “AAH”
f) Restore stored data.
If an error occurs at a step, the error is printed.
If an error does not occur, the following addresses are checked.
Addresses to be checked:
3
Check:
A) The completion print.
ER-A242U TEST FUNCTION
– 13 –
RCPT/PO110
Display 110 X
O = DRAWER OPEN
X:
C = DRAWER CLOSED
110
RCPT/PO120
10000H , 10001H , 10002H , 10004H , 10008H
10010H , 10020H , 10040H , 10080H ,
10100H , 10200H , 10400H , 10800H ,
11000H , 12000H , 14000H , 18000H ,
20000H
Display 120
Page 16
4 End of testing
The program ends after printing.
When the test ends normally. 120
When the test ends abnormally. Ex- ~ - 120
*****
x = 1: Data error
x = 2: Address error
When an error occurs, the printer outputs the error message and
then the address where the error has occurred in the area ****.
10) CPU internal RAM test
1 Key operation
RCPT/PO121
2 Test procedure
The test program checks internal RAM of the CPU.
The contents of the memory are lost after this test.
RAM (00400H - 053FFH area) is tested in the following procedure.
a) Data in the test area is stored.
b) Write “00H”
c) Read and compare “00H” and then write “55H”
d) Read and compare “55H” and then read “AAH”
e) Read and compare “AAH”
f) Stored data is restored.
If an error occurs at a step, the error is printed.
If an error does not occur, the following addresses are checked.
Addresses to be checked:
01000H , 01001H , 01002H , 01004H , 01008H
01010H , 01020H , 01040H , 01080H ,
01100H , 01200H , 01400H , 01800H ,
02000H , 04000H
Display 121
3 Check:
The completion print.
4 End of testing.
The test program ends after printing.
When the test ends normally. 121
When the test ends abnormally. Ex- ~ - 121
*****
x = 1: Data error
x = 2: Address error
If an error occurs, the printer outputs the error message and then
the address where the error has occurred in the area ****.
11) CPU internal ROM test
1 Key operation
RCPT/PO140
2 Test procedure
The test program checks that the checksum of the CPU internal
flash ROM (C0000H - FFFFFH) is correct.
The lower two digits of the checksum should be 10H.(pending)
Display 140
3 Check:
The completion print.
4 End of testing
The test will automatically be terminated and the printer prints as follows:
When the test ends normally. 140
ROM ******** (CPU CODE)
******** (Version)
When the test ends abnormally. E- ~ - 140
ROM ******** (CPU CODE)
******** (Version)
12) AD conversion port
1
Key operation
2
Test procedure
The test program displays the voltage of each AD port.
3
End of testing
You can exit the test mode by pressing any key.
The printer prints the follwing.
13) RS232C test
Install the RS232C loopback connector. (UKOG-6705RCZZ)
1
Key operation
2
Test procedure
Control signal check
/ER /RS /DR /CI /CD /CS
OFF OFF OFF OFF OFF OFF
OFF ON OFF OFF ON ON
ON OFF ON ON OFF OFF
ON ON ON ON ON ON
Data communication check
A loopback test of 256-byte data between SD-RD is performed.
DATA: $00 - $FF BAUD RATE: 9600 BPS
3
Check:
The completion print.
4
End of testing
Completion print RS TEST OK
Error print RS TEST **NG**ERxx
14) Sleep mode test
1
Key operation
2
Test procedure
The test program checks the system in SLEEP MODE (The display
goes off and the Decimal point comes on) and then waits for any
status change (KEY input or RS PORT change).
3
Check that:
A) The display goes off (excluding Decimal point)
B) The system turns active when any key is pressed.
4
End of testing
The test program will automatically be terminated and the printer
prints the following.
ER-A242U TEST FUNCTION
– 14 –
RCPT/PO160
1. Head temperature
2. Head voltage
3. Battery voltage
1601
1602
1603
160
RCPT/PO500
OUT PUT IN PUT
7-segment display: 500
xx Contents of the error
01 ER DR error
02 ER CI error
03 RS CD error
04 RS CD error
05 SD RD error DATA data
06 SD RD error DATA error/framing error
RCPT/PO550
550
XXX
XXX
XXXX
Page 17
CHAPTER 6. CAUTION TO BE USED
WHEN CONNECTING
THE RS-232 CABLE
When connecting the RS-232 cable to the ER-A242, be sure to observe
the following condiiton:
Use RS-232 cable (with core) of accessories.
[This is a necessary to support the EMI (Electronics Magnetic
Interface).]
RS-232 CONNECTOR
Use RS-232 cable
(with core) of
accessories.
ER-A242U CAUTION TO BE USED WHEN CONNECTING THE RS-232 CABLE
– 15 –
Page 18
B
B
B
D
D
D
D
C
C
C
C
B
A
1/4
12345678
12345678
12345678
12345678
VCC
VCC
1. MAIN PWB CIRCUIT
CHAPTER 7. CIRCUIT DIAGRAM AND PWB LAYOUT
/WR
NOT
C68
R88
10K
A15
VDD
VCC
NC
IC9
123456789
A16
VCC
VCC
P66
P67
31
CLK1
TXD1
RXD1
VREF
AVCC
SIN4
99
100
VDD
P97
+
VCC
47K
R55
R54
A9
A13
A8
A8
WE
A13
A15
CS2
A16
A14
A12A7A6A5A4A3A2A1A0
A14
A5
A6
A12
A7
R85
10K
R84
R83
R82
C57
100pF
R81
47K
TB5OUT
30
TB5IN
BUSY
29
TA1OUT/V
28
TA1IN/V
27
TA2OUTW
26
TA2INW
25
TBEOUT
24
TB3IN
23
TA4OUT/U
22
TA4IN/U
21
INT0
20
INT1
/FRDY
19
INT2
18
NMI
17
VCC
16
XIN
15
VSS
14
XOUT
13
RESET
12
XCOUT
11
XCIN
10
CNVSS
9
BYTE
8
CLK3
7
SIN3
6
SOUT3
5
TB3IN
4
TB4IN
3
CLK4
2
SOUT4
1
VDD
R58
C107
4.7UF/16V
VDD
R
A
K
IC6
240
C36
1000pF
30pF
A10
A11
A9
10111213141516 17
A2
A4
DAT
47K
47K
47K
100K
R56
KIA431A
VCC
cdefg
dp
a
b
abcdefg
dp
C65
0.1uF
VCC
Vcc:20pin
2569121516
Q0Q1Q2Q3Q4Q5Q6
D0D1D2D3D4D5D6D7OC
IC8
347
D0
D1
D[0..7]
A[0..19]
A[0..19]
D[0..7]
R74
10K
VCC
A11
A17
A13
A8
A15
A14A2A10
A16
A9
A12
10K
R72
10K
R71
10K
R70
10K
R69
10K
R68
10K
R67
10K
R66
10K
R65
10K
R64
10K
R63
R32
10K
R31
10K
R30
10K
R29
10K
R28
10K
R27
10K
R26
10K
R25
10K
R24
10K
R23
10K
R22
10K
R21
10K
A4
A1
A6
A3
A5
A7
D
D
D
D
R73
10K
C54
C53
C52
C51
C50C45
C49
C48
C47
150pF*10(C45-C54)
C46
C27
C26
C25
C24
C23
C22
C21
C20
C19
C18
C17
C16
R36
R35
ENA1
ENA2
R34
R33
IN1
IN2
KST2
KST1
KST0
KST3
A0
GND:10pin
19
Q7
CLK
74HC374
8
131417
18111
D7
D5
D4
D6
D3
R79
VCC
A19
ONLY
FOR
201S
TP1
C55
150pF
/CS0
R78
47K
VCC
R77
10K
R76
10K
R75
10K
50494847464544434241403938373635343332
CS0
CS1
A19
51
A18
52
A17
53
A16
54
A15
55
A14
56
A13
57
A12
58
A11
59
A10
60
A9
61
VCC
62
A8
63
VSS
64
A7
65
A6
66
A5
67
A4
68
A3
69
A2
70
A1
71
A0
72
D15
73
D14
74
D13
75
D12
76
D11
77
D10
78
D9
79
D8
80
D7
81
8283848586878889909192939495969798
IC5
M30624
R47 100
R46 100
150pF*8(C20-C27)
VCC
10K
R45
10K
R44
10K
R43
100pF*4(C16-C19)
10K
R42
10K
R41
10K
R40
10K
10K
R39
10K
10K
R38
10K
VCC
10K
R37
10K
D7
VDD
10k
C56
30pF
/CS3
/WR
/CS2
WR
CS2
CS3
BHE
201UC/AC RH-IX201 5BHZZ
201VCTQ/BCTQ/VCKB RH-I X2016BHZZ
D6D5D4D3D2D1D0
R49 100
R48 100
R52 100
R51 100
R50 100
/RD
RD
BCLK
CBCLK
R53 100
D0D1D2D3D4D5D6
HLDA
AN7
/STB1
C33
C32
HOLD
201VCKA VHI30624 FGA-1
C35
C34
C31
C30
C29
C28
AN6
/LAT
NOT
C66
R80
ALE
CLKOUT
201S VHI30624F GA-1
AN5
VPON
100pF*8(C28-C 35)
C
C
C
C
C67
/RDY
AN4
CGBANK
INSTALL
+
10uF/50V
0.1uF
P64
TP2
47K
DR1
FSD
FRD
FSCK
CLK0
RTS0
TXD0
RXD0
CLKS1
FLASH ROM
202U/V VHI30624 FGA-1
AN3
AN2
AN1
AVSS
AN0
P101
P100
VBAT
/FRES
VCC
/RD
INSTALL
R89
10K
VCC
D3
D7
D4
D5
D6
181920212223242526272829303132
A10OEA11
I/O3
I/O4
I/O5
I/O6
CS1
T/O7
I/O0
I/O1
I/O2
VSS
LP621024D-T 70ns
D2
D0
D1
A0
A1
+
B
BZ
CLK
470
R86
P75
P77
P74
DR2
P76
MOTOR
P90
P91
P92
P95
P94
P93
P96
VCC
C39
100pF
4
C38
NC
VDD
VSS
OUT CD
IC15
SII
S-80928ANMP
2315
C37
3.3K
100pF
R57
820
/RESET
NOT
INSTALL
C69
30pF
PIEZO BZ
/POFF
VCC
R87
SP1
2200pF
NOT
INSTALL
/STB2
10K
202U/A
R60
R59
47K
"H":BOOT ON
SHORTPIN
CST12.0MTW
VDD
R61
0
330
VDD
3
1
X1
202U/A
VCC
IC7
123
3
X3
2
B
B
B
B
/CS2
R90
C70
10K
150pF
C59
0.1uF
+
C58
XE-A201 : 10u F/10V,OS
XE-A202 : 10u F/16V,AL
2
X2
CST12.0MTW
C44
27pF
32.768KHz
C43
18pF
202V4/6/7
+
C42
10uF/10V,OS
C41
0.1uF
R62
678
S0
VSS
VDD
FSOUT
XIN
XOUTS1LF
FS781
45
R91
3.3K
C40
330pF
1
C108
91pF
33
202V4/6/7
+
VCC
C64
0.1uF
C63
A4
A1
A2
2311109876544241403938373635343
A0A1A2A3A4A5A6A7A8
VCC
CG ROM
IC12
D0D1D2D3D4D5D6D7D8D9D10
151719212426283016182022252729
D1
D5
D4
D0D2D6
D2
D3
D[0..7]
A[0..19]
1013
VCC
/RDY
41
C61
0.1uF
VCC
C60
0.1uF
VCC
IC10A
10uF/10V,OS
A8
A6A9A3
A7A3A13
D7
C62
9
Q
D
IC11B
12
5
Q
D
2
IC11A
3
1
2
/CS0
A10
A9
220pF
PRCL
CLK
11
PRCL
CLK
3
BCLK
74F32
/RD
21
21
21
21
3
3
3
3
NOT INSTA LL
VCC
CGBANK
A17A5A15
A12
A19
A14
A16
A11
2
43
32
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
VSS
D14
D15/A-1NCNC
31144
A0
VCC
OE/OE
CE/CE
BHE
131412
33
/RD
/CS0
/CS0
/RD
/RESET
VCC
LH5388WS(CGROM)
VSS
Vcc:14pin
GND:7pin
87654
87654
87654
87654
NOT INSTALL
(ONLY FOR 201S)
D11
D12
D13
8
Q
74F74
6
Q
74F74
Vcc:14pin
GND:7pin
A A
A A
A A
A
ER-A242U CIRCUIT DIAGRAM AND PWB LAYOUT
– 16 –
Page 19
B
B
B
D
D
D
D
2/4
12345678
12345678
12345678
12345678
C
C
C
C
B
A
VH
VH
NOT
VH
jumper
VCC
VCC
VH
MAX 9A
D
D
D
D
MOTOR
1
CN5
C79
INSTALL
A/AB
A/AB
4113512108
VS1
VS2
OUT1
IC13
VCC
ENA1
ENA2
1
213697
ENA1
ENA2
R96
30KF
C71
R93
10KF
R94
P101
2
0.1uF
OUT2
OUT3
IN1
IN1
TH
P100
R95
0.1uF
10KF
/B
B2B-EH-A
/B
C78
+
OUT4
VCONT
IN2
GND
GND
14
IN2
C73
S
10K
/VPON
Q13
10uF/50V
LB1838M
330pF
JP1
D
G
2SD2212
R101
MOTOR
Q6
MTD2955V
1K
VCC
VP
NOT
INSTALL
STRAIGHT CON
123
CN6
JUMPER WIRE
VCC
/S1
/S0
Y0
VCC
IC16
ABC
1234567
KST0
KST1
KST2
G
S
D12
1SS133
/S4
DRAWER1
RIGHT-ANGLE CON
123
CN7
5045-03A
FB3
D1A
1N4002
C66673
C80
0.1uF
FB2
C66673
VDR
F6
VO
C96
/S2
G2A
KST3
Q9
T500mA/250V
R102
DR1
C98
10uF/16V
+
0.1uF
/S6
/S5
/S4
/S3
10111213141516
Y5Y4Y3Y2Y1
74HC138
G2BG1Y7
GND Y6
89
/S7
PE
C72
0.1uF
2SK2731
D
Q7
P91
P91
C
C
C
C
5046-03A
FB4
JUMPER WIRE
C81
2SD2212
1K
VCC
C97
/S8
/S9
Y0
VCC
IC17
ABC
G2A
1234567
HUPS
Q8
D13
P91
C66673
JUMPER WIRE
0.1uF
R104
4.7K
R103
22K
Q10KRC111S
D14
1SS133
/S6
P91
P91
/S6
0.1uF
10111213141516
Y5Y4Y3Y2Y1
74HC138
G2BG1Y7
GND Y6
89
VP
VLED
KRC111S
VCC
1SS133
CN3
/S3
VCC
C75
47uF
50V
+
AB/LAT
123456789
CN4A
C74
FB5
C66673
VDR
R97
10K
/STB1
/STB2
0.1uF
cdefg
a
b
abc VDRdefg
B
B
B
B
RIGHT-ANGLE CON
DRAWER2
123
CN8
5046-03A
FB6
C66673
0.1uF
JUMPER WIRE
Q11
2SD2212
1K
R105
DR2
VCC
DAT
PE
R99
101112
ONLY HOLE
dp
/S0
/S1
dp
/S0
/S1
/S2
JUMPER WIRE
C83
10K
/S2
/S7
JUMPER WIRE
C82
FB7
C66673
0.1uF
/B
123456789
CN4B
P90
/RESET
/S7
/S8
/S8
/RESET
P90
P91
NOT
FB5,FB6,FB7:JUMPER WIRE
C76
0.1uF
CLK
/A
P91
TH
101112
P92
P93
P94
P95
P96
P97
/S9
/VON
P92
P93
P94
P95
P96
P97
/S9
/VON
10111213141516171819202122232425262728293031323334
INSTALL
HUPS
C77
R100
R98
ONLY HOLE
/S3
/S4
/S6
/S5
/S3
/S4
/S5
/S6
123456789
34FE-BT-VK-N
A A
A A
A A
A
0.1uF
4.7K
2K
21
21
21
21
3
3
3
3
87654
87654
87654
87654
ER-A242U CIRCUIT DIAGRAM AND PWB LAYOUT
– 17 –
Page 20
B
B
B
D
D
D
D
3/4
12345678
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VH
VH +7.86V +/-0.13V
ZD1
PTZ 9.1B
C
C
C
C
VB AT
100
R246
R10
22K
VLED +5.8V
VCC +5V
VCC
VDD
D9
RB721Q
R8
+C8330uF
R9
220
16V
B
1
2
CN2
B2B-XH-A -E(BLUE)
3.3M
0.1uF(M)
C9
A
21
21
21
21
L1
IPEAK>12A :100%
Q1
KT D998
Q1:HEAT SINK
R4
63uH
with FUSE
R2
+
C3
4700uF
R5
17.8KF
D2
FMB-G 24H
10(FUSE)
LM 2574
1
IC1
57
R1
50V
+
3300uF
C2
16V
3.3KF
R3
18K
L:ON
6,8pin:N.C
3
2
4
22K
H:OFF
VOUT=1.23X(1+R4/R5)
/VPON
Q2
KRC 106S
0
R114
24K
D5
R241
R113
2.2K
1SS 133
VLE D
HEAT SINK
1SS 133
D3
D7
L2
IPEAK>2.2A
G2032FZ
2
PQ1C
4
1
IC2
1SS 133
D4
VO:23.8V
1N40 02
1N40 02
D8
ZD2
PTZ 6.2A
C6
10 uF/10V,OS
+
16V
C5
1000uF
+
R6
2.7KF
180uH
D6
5
3
C4
R7
+
910F
RB060L40
220 uF/50V
REGURATOR
<- CLOSE TO
/VOF F
/VOF F
L:OFF
VOUT=1.26X(1+R13/R14)
L3
IPEAK>2.2A
H,OPEN:ON
PQ1C G2032FZ
IC3
HEAT SINK
VO
VO
C13
1000 uF/35V
+
R13
R14
560
10K
220uH
D10
2
5
4
3
1
+
C11
R11
10K
RB060L40
220 uF/50V
REGURATOR
<- CLOSE TO
C12
0.02uF(M)
R12
51
D11
Q4
KRC 106S
NOT
UD Z4.3B
ZD3
MTZJ 5.1B
INSTALL
3
3
3
3
D1
F1
POWER T RANS
202V6/7:23 0V-240V
2021V4: 220V-230V
CP301
-+
C1
MYLO R
0.033u F
3.15A
1
2
CN1
B2P -VH
1
2
202U/A : 120 V
D
D
D
D
NO T
POWER T RANS
USED
F3
/VOF F
/POF F
VP ON
NOT
INSTALL
R245
VO
0
R244
C
C
C
C
ER-A242U CIRCUIT DIAGRAM AND PWB LAYOUT
T1.0A L
0
R20
R16
R15
2.7K
9.1KG
2.7K
VCC VLE D
84
R19
56K
8
R17
0
+
C14
1uF /50V
/POF F
7
+
-
5
6
1
+
-
3
2
– 18 –
IC4B
IC4A
R18
Q3
KRA106 S
0.1uF
C15
BA10 393
MODE SW
4
BA10 393
3.9K
B
B
B
B
P-OFF
ZD4
MTZ J5.1B
/VO N
R249
33
OFF - OPEN
ON - GND
C10
0.1uF
87654
87654
87654
87654
A A
A A
A A
A
Page 21
B
B
B
D
D
D
D
4/4
12345678
12345678
12345678
12345678
C
C
C
C
B
A
VCC
C87
0.1uF
C88
+
10uF /50V
C89
CN9
/SD
/R S
/ER
FB8
FB9
FB10
EFCB322513TS X 8
0.1uF
123456789
/R S
/DR
/ER
/SD
/CD
RD RD
/CD
/CI
FB11
FB12
FB13
R1 09
R1 08
R1 10
/C S
/DR
FB14
R1 11
DB R50-09K1300
/C S
FB15
R1 12
100ohm*5
VCC
C94
C93
C91
C90 C92
1000pF*5
/CI 5V
21
21
21
21
3
3
3
3
13
17
2312894272318
V-
V+
T1OUT
VCC10
VCC
D
D
D
D
1110
C1+
C1-
C2+
C2-
C8 6
10K
R2 43
T1IN
7
6
16
0.1uF
(BUSY:FOR BOOT)
P7 4
P6 4
P64
C
C
C
C
C84
0.1uF
121415
C8 5
0.1uF
R2 42
10K
10K
R2 47
T2OUT
T2IN
20
P6 7
P74
T3OUT
T3IN
21
P67
T4OUT
T4IN
8
P6 6
R1IN
R1OUT
5
P7 5
P66
R2IN
R2OUT
P75
R3IN
R4IN
R3OUT
R4OUT
262219
P7 7
P77
R5IN
R5OUT
P7 6
P76
25
24
D16
/SHDN
/EN
/S9
/S9
IC14
HIN 211
Q14
KRC 111S
1SS3 55
P9 1
P91
B
B
B
B
A A
A A
A A
A
87654
87654
87654
87654
ER-A242U CIRCUIT DIAGRAM AND PWB LAYOUT
– 19 –
Page 22
D
D
D
D
1/12. PRINTER I/F PWB CIRCUIT
12345678
12345678
12345678
12345678
B
B
B
C
C
C
C
B
A
21
21
21
21
CN31
VCCVP
A/BB/AN.CVPVP
123456789
/LAT
/TH
GND
GND
/STB1
VCC
/STB2
GND
GND
CLK
DATVPVP
N.C
N.C
1011121314151617181920212223242526
VCC
LEDPEHUPS
N.C
27FMN-BTK-A
27
3
3
3
3
C200
0.1uF
C201
0.1uF
123456789
CN4C
D
D
D
D
101112
ONLY HOLE
C
C
C
C
ER-A242U CIRCUIT DIAGRAM AND PWB LAYOUT
123456789
CN4D
B
B
B
B
101112
ONLY HOLE
87654
87654
87654
87654
A A
A A
A A
A
– 20 –
Page 23
PWB LAYOUT
1. MAIN PWB LAYOUT
A. side
ER-A242U CIRCUIT DIAGRAM AND PWB LAYOUT
– 21 –
Page 24
B. side
ER-A242U CIRCUIT DIAGRAM AND PWB LAYOUT
– 22 –
Page 25
2. KEY INTERFACE PWB LAYOUT
A. side
B. side
3. PRINTER I/F PWB LAYOUT
ER-A242U CIRCUIT DIAGRAM AND PWB LAYOUT
– 23 –
Page 26
4. REAR DISPLAY PWB LAYOUT
5. DISPLAY PWB LAYOUT
ER-A242U CIRCUIT DIAGRAM AND PWB LAYOUT
– 24 –
Page 27
COPYRIGHT
No part of this publication may be reproduced,
electronic, mechanical, photocopying, recording, or otherwise,
without prior written permission of the publisher.
2006 BY SHARP CORPORATION
All rights reserved.
Printed in Japan.
stored in a retrieval system, or transmitted.
In any form or by any means,
SHARP CORPORATION
Information and Communication Systems Group
Quality Assurance Department
Yamatokoriyama, Nara 639-1186, Japan
2006 March Printed in Japan t
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