Symbol QRG 7875 User manual

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

1
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
-ItemDiverter
- 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
-ExercisetheScale
- Perform Calibration
- Validate the Calibration
- Secure Calibration Switch.
5. Check the Scanner Operation, see page 20
- Modify Program Parameters
- Scan Valid Bar Code Tags.

2
7875 Scanner / Scale
Verify Checkstand Preparation
Checkstand Cutout 7875-1000/2000
ABCDE
7875-1000
Scanner
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.
7875-2000
Scanner/Scale
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.
FGH I
7875-1000
Scanner
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.
7875-2000
Scanner/Scale
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.
No electronics under 7875
*F
G
F
A
CC
B
DD
E
H
IA
B
E
C
C
D
* Recommended shelf to catch the 7875 if
dropped during installation, although 7875
must not be supported by this shelf.

3
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
Note: The 7875-3000 must sit on a shelf below the checkstand
surface. The shelf should be open at the front and back.
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.
F
A
C
B
D
E
G
H
A
B
C
D
No electronics under NCR 7875

4
7875 Scanner / Scale
Display Clearance
Service Clearance
A8.0 in. (20.3 cm) minimum if checkstand structure is not removable
for servicing. 1.0 in. (2.5 cm) minimum if checkstand structure is re-
movable for servicing.
B14.0 in. (35.6 cm) minimum if checkstand structure is not removable
for servicing. 7.0 in. (17.8 cm) minimum if checkstand structure is re-
movable for servicing.
C5.1in. (13.0 cm) minimum clearance to closest checkstand panel. The
7875 must not be supported by this panel.
30
50
60
60
This area must be clear
for viewing optional
integrated display.
B
C
A
A
Mounting surface for keyboard mus
t
be removable for servicing and
vertical window replacement.
All Installations Installations Without Integrated Display

5
Quick Reference
Item Diverter
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.
7.25 in. (18.4 cm)
Item Diverter
(Must be removable to service
Scanner/Scale in checkstand)

6
7875 Scanner / Scale
Electrical Wiring to the Checkstand
Installation Type Input Voltage L1, L2 Circuit Breakers
U.S., Canada,
Japan
100 VAC to
120 VAC
100 VAC to
120 VAC
Standard single-pole;
value determined by
type of device branch
and by electrical code.
International 220 VAC to
240 VAC
220 VAC to
240 VAC
European 220 VAC 220 VAC European double-pole.
Input Voltage
Main Service
Panel
Neutral and
Ground Bus
L3
Conduit
Circuit A: Checkstand
Belt
Motor
Belt Control
Lighting
Misc. equip.
Isolated/Insulated
Ground Bus
Distribution Panel
Neutral
Bus
Circuit B: Terminal
Circuit C: Scanner/Scale
Receptacle should be easily
assessible and near the
Scanner/Scale.
Isolated Ground Receptacles
Checkstand
Frame
Note: The electrical wiring must meet all
electrical codes, laws and regulations.
Feeder wiring and insulated ground from
main service panel to distribution panel
to be run in metal conduit.
Circuit Breakers
Symbol circuits should be run in
separate metal conduits.
Note: Symbol circuits must be dedicated to
Symbol equipment or other logically
connected electronic equipment
(modems, DAA, bridges, etc.)
L1
L2
GN

7
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.
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.
Cable Cable Length Minimum Hole Size
Power Cord – Outlet
to Power Supply
3.05 m (10 ft.) 3.18 cm (3/4 in.)
Power Cord – Power
Supply to the 7875
1.22 m (4 ft.) 1.52 cm (1/2 in.)
Interface Cable 8.0 m (26.24 ft.)
4.0 m (12.12 ft.)
1.90 cm(3/4 in.)
1.90 cm (3/4 in.)
Remote Display Cable 8.0 m (26.24 ft.)
4.0 m (12.12 ft.)
1.90 cm (3/4 in.)
1.90 cm (3/4 in.)

8
7875 Scanner / Scale
Single Cable Installation
DC
POWER
REMOTE
DISPLAY
5A
MAX
SCANNER
Check switch settings
5V
PORT 1 PORT 2
DUAL PERIPHERAL PORTS
AC
Power
Cord
Power
Supply
DC Power
Cable
Interface Cable
Host Terminal
7875
Scanner/Scale
RS-232
Peripheral
Remote
Display

9
Quick Reference
Dual Cable Installation
DC
POWER
REMOTE
DISPLAY
5A
MAX
SCANNER
AUXPORT/
DATACHKR
Check switch settings
5V
PORT 1 PORT 2
DUAL PERIPHERAL PORTS
AC
Power
Cord
Power
Supply
DC Power
Cable
Scale Interface
Cable
Host Terminal
7875
Scanner/Scale
RS-232
Peripheral
Remote
Display
Scanner
Interface
Cable

10
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.
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
J1 Wire Number P1
111
222
333
444
555
666
777
888
J1 P1

11
Quick Reference
other communication protocols, both switches must be toward the
back (customer side) of the unit.
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.
AUX PORT/
DATACHKR
SCANNER
DATACHKR OCIA/IBM
RS-232 RS-232
Make sure power is
off before changing
switch setting
Switches

12
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 sup-
ports 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.

13
Quick Reference
Calibrate the Scale
Note: To comply with governmental weights and measures
regulations, you must be certified to perform the cali-
bration function. Also, you MUST calibrate the scale
when you install an 7875 Scanner/Scale.
Note: Your 7875 Scanner/Scale may not have an integrated
display, and may not have a remote display when con-
nected to some host terminals. If this is the case, a Field
Correct Alignment
Bad Alignment
Scanner Too High
Bad Alignment
Scanner Too Low
High Surface
Low Surface
High Surface
Low Surface

14
7875 Scanner / Scale
Service Calibration Display is required unless your 7875
has voice enabled. Calibration information is NOT sent
to the host terminal. Contact your Symbol representa-
tive about calibrating the scale.
Note: The interface cable between the 7875 and host terminal
must be disconnected during calibration. Some hosts
may cause interference that invalidates scale calibration.
You can calibrate the scale after power is supplied for 30 minutes if
the ambient air conditions are 68° F (20° C) for at least 24 hours. If
this condition has not been met, the scale must be on for at least 6
hours before you can calibrate it. Also, you must use a certified
weight set to calibrate and certify the scale.
The EEPROM on the scale board maintains an audit trail of scale
calibration and programming activity. The audit trail contains an
event counter that records the number of times the scale has been
calibrated. You can display the audit trail count on an integrated,
remote, or Field Service Calibration Display by pressing the Scale
Zero Button on the Operator Display Panel. The display alternates
between Cal xxx and PAr xxx.
Exercise the Scale
You must exercise the scale before performing a calibration. Add
and remove weight to your scale in the order provided in the
following chart. In this building procedure you start with no weight
(0) and sequentially add and remove weight to obtain the values
shown in the chart. Perform this procedure four times.
Wei gh t
Feature Total Weight on Top Plate
9.995 kg 0.0 kg 2.5 kg 5.0 kg 10. 0 kg 5.0 kg 2.5 kg 0.0 kg
13.995 kg 0.0 kg 2.5 kg 5.0 kg 15.0 kg 5.0 kg 2.5 kg 0.0 kg
30.0 lb. 0.0 lb. 5.0 lb. 15.0 lb. 30.0 lb. 15.0 lb. 5.0 lb. 0.0 lb.

15
Quick Reference
Access the Calibration Switch
The Calibration Switch is located below the Top Plate. Remove the
Top Plate to access to the Calibration Switch cover. Lift the cover up
to remove.
Remove the screw that secures the Calibration Switch cover. Also
remove the seal if one is present. Rotate the Calibration Switch
cover to access to the Calibration Switch.
Calibration
Switch Cover
Calibration Switch
Security Cover
Screw
Wire Seal
Calibration
Switch

16
7875 Scanner / Scale
Calibrate the Scale
1. Press the Scale Zero Button to display the Cal and PAr values.
Record these values.
2. Access the Calibration Switch, then place the top plate on the
unit before pressing the switch. Raise the front edge of the Top
Plate just enough to reach the switch.
3. Press the switch, then immediately lower the Top Plate into
position. The display should show Ready C-00 kg (00 lb.).
4. Follow the steps in the following chart.
Verify the Calibration
The scale accuracy test meets government requirements of testing
the accuracy of the scale after performing a scale calibration. It
contains a series of four tests that must be run in the continuous
sequence given.
Increasing Load Test
This test checks the scale’s accuracy when incrementally adding
weight to the center of the top plate. Use weights that correspond to
the 7875 weight feature.
Display Add Weight Remove Weight
Ready C-2.5 kg (05 lb.) 2.50 kg (5.00 lb.)
Ready C-05 kg (15 lb.) 2.50 kg (10.00 lb.)
Ready C-10 kg (30 lb.) 5.00 kg (15.00 lb.)
Ready C-00 kg (00 lb.) 10.00 kg (30.00 lb.)
Ready 0.000 kg (0.00 lb.)
Step
Weig h t
Feature Add Weight
Remove
Weight Display Result
1 9.995 kg 0.1 kg 0.1 ± 0.00 kg
13.995 kg 0.1 kg 0.1 ± 0.00 kg
30.0 lb. 0.2 lb. 0.2 ± 0.00 lb.

17
Quick Reference
Note: Do NOT remove any weight from the Top Plate.
Over-Capacity Test
This test checks for the proper indication from the scale when too
much weight is placed on the top plate.
Note: This test must immediately follow the increasing load
test; do not remove any of the weights prior to running
this test.
Place additional weight on the center of the top plate as shown in
the following chart. Use the weight that corresponds to the 7875
weight feature. The display shows a series of dashes to indicate an
over-capacity condition.
2 9.995 kg 2.5 kg 0.1 kg 2.5 ± 0.00 kg
13.995 kg 2.5 kg 0.1 kg 2.5 ± 0.00 kg
30.0 lb. 5.0 lb. 0.2 lb. 5.0 ± 0.00 lb.
3 9.995 kg 2.5 kg 5.0 ± 0.005 kg
13.995 kg 4.5 kg 7.0 ± 0.005 kg
30.0 lb. 5.0 lb. 10.0 ± 0.01 lb.
4 9.995 kg 2.5 kg 7.5 ± 0.005 kg
13.995 kg 3.0 kg 10.0 ± 0.005 kg
30.0 lb. 10.0 lb. 20.0 ± 0.01 lb.
5 9.995 kg 2.495 kg 9.995 ± 0.005 kg
13.995 kg 3.995 kg 13.995 ± 0.005 kg
30.0 lb. 10.0 lb. 30.0 ± 0.01 lb.
Step
Weig h t
Feature
Add
Weig h t
Remove
Weight Display Result
1 9.995 kg 0.04 kg --.---
13.995 kg 0.04 kg --.---
30.0 lb. 0.08 lb. --.---
Step
Weig h t
Feature Add Weight
Remove
Weight Display Result

18
7875 Scanner / Scale
Note: Do NOT remove any weight from the Top Plate.
Decreasing Load Test
This test checks the scale’s accuracy when incrementally removing
weight from the top plate. Use weights that correspond to the 7875
weight feature.
Note: This test must immediately follow the over-capacity test;
do not remove any of the weights prior to running this
test.
2 9.995 kg 0.04 kg 9.995 ± 0.005 kg
13.995 kg 0.04 kg 13.995 ± 0.005 kg
30.0 lb. 0.08 lb. 30.0 ± 0.01 lb.
Step
Weigh t
Feature Add Weight
Remove
Weight Display Result
1 9.995 kg 2.495 kg 7.5 ± 0.005 kg
13.995 kg 3.995 kg 10.0 ± 0.005 kg
30.0 lb. 10.0 lb. 20.0 ± 0.01 lb.
2 9.995 kg 5.0 kg 2.5 ± 0.00 kg
13.995 kg 7.5 kg 2.5 ± 0.00 kg
30.0 lb. 15.0 lb. 5.0 ± 0.00 lb.
3 9.995 kg 0.1 kg 2.5 kg 0.1 ± 0.00 kg
13.995 kg 0.1 kg 2.5 kg 0.1 ± 0.00 kg
30.0 lb. 0.2 lb. 5.0 lb. 0.2 ± 0.00 lb.
4 9.995 kg 0.1 kg 0.0 ± 0.00 kg
13.995 kg 0.1 kg 0.0 ± 0.00 kg
30.0 lb. 0.2 lb. 0.0 ± 0.00 lb.
Step
Weig h t
Feature
Add
Weigh t
Remove
Weight Display Result