Sharp ER-A750 User manual

SERVICE MANUAL
CODE: 00ZERA750USME
MODEL ER-A750
(For"U"&"A"version)
CHAPTER 1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
CHAPTER 2. OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
CHAPTER 3. SERVICE PRECAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
CHAPTER 4. SRV RESET (Program Loop Reset) and switch to SRVmode . . . . . . . . . . . . . .4-1
CHAPTER 5. MASTER RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
CHAPTER 6. DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
CHAPTER 7. CIRCUITDESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
CHAPTER 8. PWB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
CHAPTER 9. CIRCUITDIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1
PARTS GUIDE
CONTENTS
SHARP CORPORATION This document has been published to be
used for after sales service only. The con-
tents are subject to change without notice.
Parts marked with "!" is 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.

TheRBRCTM Seal
TheRBRCTM Seal on the easily removable nickel-cadmium battery pack contained
in our product indicates that SHARP is voluntarily participating in an industry program to
collect and recycle these battery packs at the end of their useful life, when taken out of
service within the United States. The RBRCTM program provides a convenient alternative to
placing spent nickel-cadmium battery packs into the trash or municipal waste stream,
which is illegal in some areas.
SHARP’spaymentstoRBRCTM makes it easy for you to drop off the spent battery pack at local retailers of
replacement nickel-cadmium batteries, or at authorized SHARP product service centers. You may also contact
your local recycling center for information on where to return the spent battery pack. SHARP’s involvement in this
program is part of its commitment to protecting our environment and conserving natural resources.
(RBRCTM is a trademark of the Rechargeable Battery Recycling Corporation.)

CHAPTER 1. SPECIFICATION
1. Apearance
Externalview
Frontview
Rear view
2. Rating
External dimensions 11.4 ×14.4 ×10.3 in. (290 ×365 ×262
mm)
Weight 11.2 lbs. (5.1 kg)
Power source 120VAC ±10% 60 Hz
Power consumption Stand-by: 22W
Operating: 25W (max.)
Working temperatures 32 to 104˚F (0 to 40˚C)
3. Keyboard
1) Standardkeyboardlayout
2) Key top name
1 Standard key top
KEYTOP DESCRIPTION
0 ∼9,00 Numeric keys
• Decimal point key
CL Clear key
@/FOR Multiplication / Split-pricing key
RCPT Receipt print key
RPSEND Remote printer send key
d 1 Discount 1 key
%1 Percent 1 key
TAX1SHIFT
TAX2SHIFT Tax 1 and 2 shift keys
RFND Refund key
VOID Void key
PASTVOID Past void key
SBTLVOID Subtotal void key
RTN Return key
PLU/SUB Price lookup / Subdepartment key
1 ∼99 Direct price look up key
LEVEL 1 ∼5 PLUlevel shift 1 ∼5 keys
SRVC Servicekey
FINAL Final key
BAL Balance key
DRVNC New check 2 key (For drive-through)
DRVGLU Gest look up 2 key (For drive-through)
SERV# Server code entry key
EMP# Employee code entry key
MISCFUNC Miscellaneous function key
MODE Mode key
ENTER Enter key
AUTO1,2 Automatic sequencing 1 and 2 keys
CH# Charge menu key
CHK# Check menu key
TRAYSBTL Tray subtotal key
MDSESBTL Merchandise subtotal key
Operator display
Keyboard
AC cord
Power switch in
sure that the power
switch is placed in the
OFF position prior to
connecting AC power
Left side of
the machine
IR receiver cover Brightness
control
Contrast control
Power switch
Customer
Display
Rear cover
91
82
73
64
55
46
38
30
22
14
7
1
92
83
74
65
56
47
31
23
39
15
8
2
93
84
75
66
57
48
40
32
24
16
9
3
94
85
76
67
58
49
41
33
25
17
10
4
95
86
77
68
59
50
42
34
26
18
11
5
96
87
78
69
60
51
43
35
27
19
12
6
97
88
79
70
61
52
44
36
28
20
13
89
80
71
62
53
45
90
81
72
63
54
37
29
21
ENTER
CANCEL
PAGE
VOID
PAGE
UP
DOWN
LEVEL
2
LEVEL
1
LEVEL
3
LEVEL
4
LEVEL
5
MISC
FUNC
TEX1
SHIFT
RP
SEND
RCPT
1
NDSE
PAST
SERV
#
SBTL
VOID
7
4
1
0
8
5
2
00
9
6
3
TEX2
SHIFT
AUTO
1
MODE
EMP
#
BAL
1%
CHK
#
SBTL
@/
VOID
FOR
AUTO
2
RFND
RTN
CH
#
PLU/
SUB
CL
DRV
NC
DRV
GLU
SRVC
FINAL
TRAY
SBTL
$5
$10
$20
SBTL
CA/AT
1–1

KEYTOP DESCRIPTION
SBTL Subtotal key
CA/AT Cash / Amount tendered key
$5,$10,$20 Speed tender key
(Used for AUTO8,9,and 10 key)
PAGEUP Page up key
PAGEDOWN Page down key
→Cursor right key
←Cursor left key
↑Cursor up key
↓Cursor down key
CANCEL Cancel key
2 Optional key top
KEYTOP DESCRIPTION
000 000 key
98 ∼135 Direct price look up keys
1 ∼50 Department keys
%2 ∼%9 Percent 2 ∼9 keys
d 2∼d 9 keys Discount 2 ∼9 keys
CH1 ∼CH8 Charge 1 ∼8 keys
CA2 Cash 2 key
CONV1 ∼CONV4 Conversion 1 ∼4 keys
RA1,RA2 Received on account 1 and 2 keys
PO1,PO2 Paid out 1 and 2 keys
AUTO3 ∼AUTO7 Automatic sequencing 3 ∼7 keys
CHK1 ∼CHK4 Check 1 ∼4 keys
BT Bill totalize / Bill transfer key (CHECK-
ADD)
TRANSOUT Transfer out key
TRANSIN Transfer in key
CASHTIP Cash tip key
CHARGETIP Charge tip key
TIPPAID Tip paid key
EAT IN 1 ∼EAT IN 3 Eat in 1 ∼3 keys
TAX3SHIFT
TAX4SHIFT Tax 3 and 4 shift keys
DEPOSIT Deposit key
DEPOSITRF Deposit refund key
TAX Manual tax key
GRTEX Gratuity exempt key
COVERCNT Cover count entry key
BILL Bill print key
CONV# Currency conversion menu key
SHIFT1 ∼SHIFT5 Pricelevel shift 1 ∼5 keys
BACKSPACE Backspace key
DELETE Delete key
NC New check key
GLU Guest look up key
# Non-add code entry key
NS No-sale key
MGR# Manager code entry key
OPENTARE Tare entry Key
REPEAT Repeat entry key
PERSON# Person number entry key
IND.PAYMENT Individual payment key
EMPL.SALES Employee sales key
RCPSW Receipt ON / OFF key
KEYTOP DESCRIPTION
SCALE Scale entry key
3) Textprogrammingkeysheetlayout
4) Blank key sheet layout
(ENTER)
PAGE
(DC)
PAGE
UP
DOWN
1
7
4
1
0
8
5
2
00
9
6
3
(MODE)
=
1%
@/
FOR
CL
(INS)
BACK
SBTL
CA/AT
!
Q
A
@
W
S
#
E
D
$
R
F
%
T
G
^
Y
H
&
U
J
*
I
K
(
O
L
Z X CVBNM ,
P
/
.
( ((
(
(CANCEL)
(
(
(RECALL)
N
_ -
}{
+ ][
?
,,,
><
(DEL)
SPACE
NEXT
PECORD
(
(SHIFT)
(SPACE) (SPACE) (SPACE) (SPACE) (SPACE)
~
1–2

3. Display
1) Operatordisplay
•Screen example 1 (REG mode)
•Screen example 2 (PGM mode)
Mode name
Merchandise subtotal excluding taxes
Tax amounts
Sales amount including taxes
Time
Sentinel mark (X):
Appears in the lower comer of the
screen when the cash in drawer exceeds a
programmed sentinel amount. The sentinel
check is performed for the total cash in
drawer.
Menu level shift indicator (L1):
Shows the menu level currently selected.
Price level shift indicator (P1):
Shows the PLU price level currently selected.
Numeric entry:Entered figures appear at the cursor position.
Received media type
Window
In the REG mode, it shows sales information you have just entered such as items, tax amounts
and media types.
Server name
Receipt ON/OFF status:
Stock alarm lamp
Receipt OFF:R
Receipt ON:Blank
Time
Mode name
Casp lock indicator(A/a):
The upeer-case letter "A" appears when
Caps Lock is on, and the lower-case
letter "a" appears when Caps Lock is off
during text programming.
Double-size character mode indicator(W):
Apperars when the double-size character
mode is selected during text programming.
Window
In the PGM mode,
programmable items are listed.
Items remain bottom of the window
1–3

Device type LCD display
Dot format 320(W)×240(H) Full dot
Dot size 0.33 ×0.33 mm
Dot space 0.03 mm
Dot color White
Back color Dark blue
Weight 180 g
2) Customerdisplay
ST: Lights up when a subtotal is displayed.
CG: Lights up when the change due amount appears in the dis-
play or when the total sale amount is negative.
TL: Lights up when you finalize a transaction by pressing the
CA/AT , CA2 , CHK
1throuth
CHK
4or
CH
1through
CH
8
without any amount tendered entry.
VOID: Lights up when the VOID key or PAST
VOID key is pressed or
when an item void entry is made.
RFND: Lights up when the RFND key is pressed or when a refund
item entry is made.
Device type 7 segment display tube
Number of lines 1 line
Number of positions 7 positions numeric display
Color of display Green
Character size 13(H) ×6(W) mm
3) Displayadjustment
You can adjust the brightness and contrast of the display by using
the corresponding controls.
ST CG TL VOID RFND
Machine state
indicator lamps
Amount
Contrast control
Turning the control backwards
darkens the display and turning
it forwards lightens the display.
Brightness control
Turning the control backwards
darkensthe display and turning it
forwards brightens the display.
1–4

CHAPTER2. OPTIONS
1. System configuration
2–1

2. Options
No. NAME MODEL DESCRIPTION
1 ON-LINESYSTEM ER-A7RS 2 port RS232 I/F
MCRI/F
2 EXPANSION
MEMORYBOARD ER-03MB 1MBPS-RAM
ER-04MB 2MBPS-RAM
3 REMOTEPRINTER ER-03RP
ER-04RP
4 MCR
(Magnet Card Reader) ER-A8MR
5 DATABACKUP
SYSTEM ER-02FD FD unit
CE-IR2 WirelessI/Ffor IR
comunication
CE-IR4
3. Service tools
No. NAME PARTSCODE PRICE
RANK DESCRIPTION
1 TERMINATOR(50Ω) QCNCM7145RCZZ AZ For SRN in-line system
2 EXPANSIONPWB CKOG-6724BHZZ BX
3 MCR test card UKOG-6718RCZZ BE ForER-A8MR
4 RS232LOOPBACKCONNECTOR UKOG-6705RCZZ BC For RS232 connector
4. Supplies
No. NAME PARTSCODE PRICE
RANK DESCRIPTION
1 STANDARDKEYSHEET PSHEK6849BHZZ AS
2 PROGRAMMINGKEYSHEET PSHEK6850BHZZ AH
3 BLANKKEYSHEET PSHEK6818BHZZ AQ
2–2

5. How to use service tools
5-1. ExpansionPWB:CKOG-6724BHZZ
•Extrenal view
•Plain view
•Connection diagram
5-2. MCR test card: UKOG-6718RCZZ
•Used when executing the diagnostics of the ER-A8MR.
•External view
Test pins : Used to check the bus signals.
Bus connector : Used to check the bus signals.
Connected to the ER-A750 Mother PWB.
ER-A750 bus connector
ER-A7RS
2–3