7875 Scanner/Scale
7875 Scanner / Scale
1999 SYMBOL TECHNOLOGIES, INC. All rights reserved.
Symbol reserves the right to make changes to any product to improve reliability,
function, or design.
Symbol does not assume any product liability arising out of, or in connection with, the
application or use of any product, circuit, or application described herein.
No license is granted, either expressly or by implication, estoppel, or otherwise under
any patent right or patent, covering or relating to any combination, system, apparatus,
machine, material, method, or process in which Symbol products might be used. An
implied license only exists for equipment, circuits, and subsystems contained in Symbol
products.
Symbol is a registered trademark of Symbol Technologies, Inc. Other product names
mentioned in this manual may be trademarks or registered trademarks of their
respective companies and are hereby acknowledged.
Symbol Technologies, Inc.
One Symbol Plaza
Holtsville, N.Y. 11742-1300
http://www.symbol.com
Quick Reference
Installation Steps
When installing the 7875 Scanner/Scale, follow the installation
steps below. Skip step 4 if the unit does not have a scale.
1. Verify Checkstand Preparation, see page 1
- Checkstand Cutout
- Display Clearance
- Service Clearance
-Item Diverter
- Ventilation Requirements
- Electrical Wiring
- Cable Hole Requirements.
2. Connect the Cables, see page 7
- Power Supply
- Remote Display
- Interface Cables
- RS-232 Peripheral Cable.
3. Install 7875 in Checkstand, see page 10
- Set Communications Protocol Switch
- Put the 7875 in Checkstand Cutout
- Align the 7875 to the Checkstand.
4. Calibrate the Scale, see page 13
- Access Calibration Switch
-Exercise the Scale
- Perform Calibration
- Validate the Calibration
- Secure Calibration Switch.
5. Check the Scanner Operation, see page 20
- Modify Program Parameters
- Scan Valid Bar Code Tags.
1
7875 Scanner / Scale
Verify Checkstand Preparation
Checkstand Cutout 7875-1000/2000
C
D
I
H
DD
CC
E
B
ABCDE
7875-1000
Scanner
7875-2000
Scanner/Scale
29.51 cm 50.95 cm 3.49 cm 0.95 cm 43.97 cm
11 5/8 in. 20 1/16 in. 1 3/8 in. 3/8 in. 17 5/16 in.
30.63 cm 50.95 cm 3.49 cm 1.27 cm 43.97 cm
12 1/16 in. 20 1/16 in. 1 3/8 in. 1/2 in. 17 5/16 in.
FGHI
7875-1000
Scanner
7875-2000
Scanner/Scale
3.49 cm 13.0 cm 18.10 cm 18.42 cm
1 3/8 in. 5 1/8 in. 7 1/8 in. 7 1/4 in.
3.49 cm 13.0 cm 17.78 cm 18.42 cm
1 3/8 in. 5 1/8 in. 7 in. 7 1/4 in.
B
E
C
A
*F
A
No electronics under 7875
F
* Recommended shelf to catch the 7875 if
dropped during installation, although 7875
must not be supported by this shelf.
G
2
Quick Reference
Note: Dimension A for a 7875-2000 includes a spacer along
the side of the unit so that it fits an existing 7870-2000
cutout.
Checkstand Cutout – 7875-3000
D
H
G
D
C
E
B
ABCD
29.51 cm 40.96 cm 3.49 cm 0.95 cm
11 5/8 in. 16 1/8 in. 1 3/8 in. 3/8 in.
EFGH
37.34 cm 12.54 cm 18.10 cm 18.42 cm
14 3/4 in. 4 15/16 in. 7 1/8 in. 7 1/4 in.
C
No electronics under NCR 7875
B
A
A
F
Note: The 7875-3000 must sit on a shelf below the checkstand
surface. The shelf should be open at the front and back.
3
7875 Scanner / Scale
t
Display Clearance
50
30
This area must b e clea r
for viewing optional
integrated display.
60
Service Clearance
Mounting surface for keyboard mus
be removable for servicing and
vertical window replacement.
B
A
All Installations
A
8.0 in. (20.3 cm) minimum if checkstand structure is not removable
for servicing. 1.0 in. (2.5 cm) minimum if checkstand structure is removable for servicing.
B
14.0 in. (35.6 cm) minimum if checkstand structure is not removable
for servicing. 7.0 in. (17.8 cm) minimum if checkstand structure is removable for servicing.
C
5.1in. (13.0 cm) minimum clearance to closest checkstand panel.
7875
must not be supported by this panel.
A
Installations Without Integrated Display
60
C
The
4
Quick Reference
Item Diverter
7.25 in. (18.4 cm)
Item Diverter
(Must be removable to service
Scanner/Scale in checkstand)
Ventilation Requirements
The 7875 Scanner/Scale is designed to operate without an exhaust
fan in the checkstand; however, there must be adequate convection
airflow. The ambient temperature inside the checkstand cannot be
higher than 104° F (40° C). Also, the ambient temperature inside
the checkstand cannot be higher than 12.6° F (7° C) above the
ambient temperature outside the checkstand. For example, if the
ambient temperature outside the checkstand is 76° F (24.4° C), the
ambient temperature inside the checkstand cannot be greater than
88.6° F (31.4° C). If the checkstand contains other heat producing
equipment, you may need to use forced air to keep the temperature
within the specified range. However, air coming into or leaving the
checkstand
MUST NOT
enter or exit past the 7875 Scanner/Scale.
5
7875 Scanner / Scale
Electrical Wiring to the Checkstand
Input Voltage
Neutral and
Ground Bus
L3
Main Service
Panel
N
G
Conduit
Circuit A: Checkstand
Note:
Feeder wiring and insulated ground from
main service panel to distribution panel
to be run in metal conduit.
Belt Control
Lighting
Misc. equip.
The electrical wiring must meet all
electrical codes, laws and regulations.
Motor
Checkstand
Frame
Belt
Isolated/Insulated
Ground Bus
Neutral
Bus
Distribution Panel
L2
L1
Circuit Breakers
Symbol circuits should be run in
separate metal conduits.
Note:
Circuit B: Terminal
Circuit C: Scanner/Scale
Receptacle should be easily
assessible and near the
Scanner/Scale.
Isolated Ground Receptacles
Symbol circuits must be dedicated to
Symbol equipment or other logically
connected electronic equipment
(modems, DAA, bridges, etc.)
Installation Type Input Voltage L1, L2 Circuit Breakers
U.S., Canada,
Japan
International 220 VAC to
100 VAC to
120 VAC
240 VAC
100 VAC to
120 VAC
220 VAC to
240 VAC
Standard single-pole;
value determined by
type of device branch
and by electrical code.
European 220 VAC 220 VAC European double-pole.
6
Quick Reference
Note: The 7875 outlet in the checkstand must be connected to
a circuit breaker switch. This switch must be located
close to the operator and is used as the On/Off switch
for the 7875.
Hole Requirements for Cables
To run the various cables through the checkstand, you may need to
drill holes in some of the panels. The holes must be large enough for
the connector on one end of the cable to pass through. Ensure there
are no sharp edges to cut the cable. The following table gives the
minimum hole size for each of the 7875 cables.
Cable Cable Length Minimum Hole Size
Power Cord – Outlet
to Power Supply
Power Cord – Power
Supply to the 7875
Interface Cable 8.0 m (26.24 ft.)
Remote Display Cable 8.0 m (26.24 ft.)
3.05 m (10 ft.) 3.18 cm (3/4 in.)
1.22 m (4 ft.) 1.52 cm (1/2 in.)
1.90 cm(3/4 in.)
4.0 m (12.12 ft.)
4.0 m (12.12 ft.)
1.90 cm (3/4 in.)
1.90 cm (3/4 in.)
1.90 cm (3/4 in.)
Connect the Cables
There are several cables associated with the 7875, some required
with every installation and some optional, depending on the system.
Make sure you have all the necessary cables for your installation.
Connect the cables according to one of the following two
illustrations.
7
7875 Scanner / Scale
Single Cable Installation
AC
Power
Cord
Power
Supply
DC Power
Cable
Remote
Display
Check switch settings
C
R
Y
E
D
E
T
A
L
O
W
P
M
O
E
IS
P
R
D
R
X
E
A
N
M
N
A
A
C
5
S
V
5
7875
Scanner/Scale
Interface Cable
Host Terminal
DUAL PERIPHERAL PORTS
PORT 1
PORT 2
RS-232
Peripheral
8
Quick Reference
Dual Cable Installation
AC
Power
Cord
Power
Supply
DC Power
Cable
Remote
Display
Chec k switch sett ing s
C
Y
R
E
D
T
E
A
L
O
W
P
M
O
IS
E
P
D
R
Scanner
Interface
Cable
X
A
M
A
5
V
5
/
R
T
E
R
N
O
N
A
P
C
X
S
U
A
7875
Scanner/Scale
Scale Interface
Cable
Host Terminal
DUAL PERIPHERAL PORTS
R
K
H
C
A
T
A
D
PORT 1
PORT 2
RS-232
Peripheral
9
7875 Scanner / Scale
RS-232 Peripheral Cables
The cable on some RS-232 hand-held peripheral devices is not long
enough to connect to the 7875 (under the checkstand) and still
permit easy use of the device. In these cases, Symbol recommends
installing an extension cable. You can obtain one from Symbol or
you can make your own. If you make your own, it should be
approximately 39 inches (1 meter) long with 8-pin phone type
connectors on each end.
J1 P1
J1 Wire Number P1
111
222
333
444
555
666
777
888
Install 7875 in Checkstand
Set the Communications Protocol Switch
Before setting the 7875 into the cutout in the checkstand, verify that
the Communications Protocol Switch is properly set. Single cable
units have one switch, dual cable units have two. The switches are
located on the Interface Board and you can access them through
holes in the side of the unit. For RS-232 communications, both
switches must be toward the front (operator side) of the unit. For all
10
Quick Reference
other communication protocols, both switches must be toward the
back (customer side) of the unit.
AUX PORT/
DATACHKR
DATACHKR OCIA/IBM
RS-232 RS-232
Make sure power is
off before changing
switch setting
Switches
SCANNER
Installing 7875 into Checkstand Cutout
Grasp the 7875 Scanner/Scale and lower it into the checkstand
cutout. Be careful not to damage any of the cables. After the unit is
properly sitting on its supports, install the Top Plate.
Note: It is important that the 7875 does not rock on its sup-
ports. Make sure all adjustable supports are securely
fastened and that the 7875 is sitting on all supports.
11
7875 Scanner / Scale
Align the 7875 to the Checkstand
The leading edge of the Top Plate must be flush or up to 1/16 in.
(0.15 cm) below the top of the checkstand. The trailing edge of the
Top Plate must be flush or up to 1/16 in. (0.15 cm) above the top of
the checkstand.
Note: The four adjustable support posts on the Scale Hinge
Assembly are set at the factory. Do not attempt to adjust
the Top Plate using these posts. Adjust the 7875 supports to align the Top Plate with the checkstand.
If the Top Plate is properly aligned with the checkstand, an item
should easily slide from the checkstand onto the Top Plate and then
from the Top Plate onto the checkstand. The following illustration
shows this alignment.
12
Loading...