OHAUS T71P User manual

SERVICE MANUAL
7000 Series
T71 Indicators
T71P T71XW
Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 [phone]

SERVICE MANUAL
7000 Series T71 Indicators:
T71P & T71XW
The information contained in this manual is believed to be accurate at the time of publication, but Ohaus
Corporation assumes no liability arising from the use or misuse of this material. Reproduction of this
material is strictly prohibited.
Material in this manual is subject to change.
© Copyright 2008 Ohaus Corporation, all rights reserved.
TM Registered trademark of Ohaus Corporation.

TABLE OF CONTENTS
CHAPTER 1 GETTING STARTED Page No.
1.1 Introduction................................................................................................................1-1
1.2 Service Facilities........................................................................................................1-1
1.3 Tools and Test Equipment Required.........................................................................1-2
1.3.1 Special Tools and Test Equipment List..............................................................1-2
1.3.2 Standard Tools and Test Equipment List ...........................................................1-2
1.4 T71P and T71XW: Top and Bottom Housing ............................................................1-2
1.5 Specifications.............................................................................................................1-4
1.6 Hardware Setup or Disassembly...............................................................................1-5
1.6.1 Connecting the Scale Base’s Load Cell.............................................................1-5
1.6.2 Jumper Connections ..........................................................................................1-6
1.6.3 RS232 Interface .................................................................................................1-6
1.7 Operation...................................................................................................................1-7
1.7.1 Power Supply.....................................................................................................1-7
1.7.2 Overview of the Controls....................................................................................1-7
1.7.3 Overview of the Display Indicators.....................................................................1-7
1.7.4 Overview of the Control Functions .....................................................................1-8
1.7.5 Menu Setup........................................................................................................1-9
1.7.6 Language Menu Setup.....................................................................................1-12
1.8 Calibration................................................................................................................1-13
1.8.1 Zero Calibration................................................................................................1-13
1.8.2 Span Calibration...............................................................................................1-14
1.8.3 3-point Linearity Calibration..............................................................................1-15
1.8.4 5-point Linearity Calibration..............................................................................1-16
1.8.5 Calibration Test ................................................................................................1-17
1.8.6 Geographical Adjustment Factor......................................................................1-17
1.9 RS232 Interface Connection....................................................................................1-18
1.9.1 Setting Communications Parameters...............................................................1-18
1.9.2 Interface Commands........................................................................................1-19
1.9.3 Output Format..................................................................................................1-20
1.10 Legal For Trade (LFT) .............................................................................................1-21
CHAPTER 2 TROUBLESHOOTING
2.1 Introduction................................................................................................................2-1
2.2 Visual Inspection........................................................................................................2-1
2.3 Diagnostic Guide .......................................................................................................2-2
2.2.1 Diagnosis............................................................................................................2-2
CHAPTER 3 MAINTENANCE PROCEDURES
3.1 Preventive Maintenance............................................................................................3-1
3.1.1 Preventive Maintenance Checklist .....................................................................3-1
3.2 Replacement of Major Components..........................................................................3-1
3.2.1 Main Printed Circuit Board (PCB) Replacement.................................................3-2
3.2.1 Display Printed Circuit Board (PCB) Replacement.............................................3-3
3.2.3 Membrane Switch Replacement.........................................................................3-4
CHAPTER 4 TESTING
4.1. Testing.......................................................................................................................4-1
4.2 Power Test.................................................................................................................4-1
4.3 Performance Tests Using a Scale Base....................................................................4-1
Ohaus Corporation www.ohaus.com 1 7000 Series T71 Indicators Service Manual

TABLE OF CONTENTS
CHAPTER 4 TESTING (continued) Page No.
4.3.1 Increasing/Decreasing Load Test.......................................................................4-2
4.3.2 Overload/Underload Test...................................................................................4-2
4.4 Performance Tests Using a Load Cell Simulator.......................................................4-3
4.5 Calibration Retention Test.........................................................................................4-3
4.6 RS232 Interface Test.................................................................................................4.3
4.7 Print Test ...................................................................................................................4-3
CHAPTER 5 PARTS LISTS & DIAGRAMS
5-1 7000 Series T71P Indicator: Housing & Internal Parts..............................................5-2
5-2 7000 Series T71XW Indicator: Housing & Internal Parts...........................................5-4
APPENDIX A SETUP & CALIBRATION VALUES
Appendix A. Geographical Adjustment Values .................................................................. A-1
LIST OF TABLES
TABLE NO. TITLE Page No.
1-1 Specifications........................................................................................................1-3
1-2 Functions of Display Controls................................................................................1-7
1-3 Functions of Display Keypad.................................................................................1-8
1-4 T71 Menu Structure ..............................................................................................1-9
1-5 Interface Command Table...................................................................................1-18
1-6 Default Serial Output Format...............................................................................1-19
2-1 Diagnostic Guide...................................................................................................2-3
4-1 Increasing/Decreasing Load Test..........................................................................4-2
5-1 T71P Indicator: Housing & Internal Parts..............................................................5-3
5-2 T71XW Indicator: Housing & Internal Parts...........................................................5-5
A-1 Geographical Adjustment Values......................................................................... A-1
LIST OF ILLUSTRATIONS
FIGURE NO. TITLE
1-1 Top and Bottom Housing, and Rear Panel, T71P.................................................1-2
1-2 Top and Bottom Housing, and Rear Panel, T71XW..............................................1-3
1-3 Printed Circuit Board (PCB), T71 Indicator ...........................................................1-5
1-4 Load Cell Terminal Blocks J4 (Scale 1) and J7 (Scale 2).....................................1-5
1-5 Load Cell wiring.....................................................................................................1-6
1-6 Open/shorted jumpers...........................................................................................1-6
1-7 RS232 Pins ...........................................................................................................1-6
1-8 Battery charge symbol...........................................................................................1-7
1-9 T71 Display ...........................................................................................................1-7
1-10 T71 Display Indicator.............................................................................................1-7
1-11 Changing the menu language.............................................................................1-12
1-12 T71P Wire Seal...................................................................................................1-16
1-13 T71P Paper Seal.................................................................................................1-16
1-14 T71XW Wire Seal................................................................................................1-16
1-15 T71XW Paper Seal..............................................................................................1-16
2-1 Visual Checking Procedures.................................................................................2-1
5-1 Series 7000 T71P Indicator: Housing & Internal Parts..........................................5-2
5-1 Series 7000 T71XW Indicator: Housing & Internal Parts ......................................5-4
7000 Series T71 Indicators Service Manual 2 Ohaus Corporation www.ohaus.com

CHAPTER 1 GETTING STARTED
7000 Series T71 Indicator Service Manual 1-1 Ohaus Corporation www.ohaus.com
1.1 INTRODUCTION
This service manual contains the information needed to perform routine maintenance and
service on the Ohaus T71 Indicators. The contents of this manual are contained in five
chapters:
Chapter 1 Getting Started – Contains information regarding service facilities, tools and test
equipment, specifications, hardware setup or disassembly, operating the Indicator, scale setup
and calibration, and configuring the Indicator’s communication and Legal-for-Trade menus.
Chapter 2 Troubleshooting – Contains a diagnosis/diagnostics chart and error code table.
Chapter 3 Maintenance Procedures – Contains preventive maintenance procedures and
disassembly, repair and replacement procedures.
Chapter 4 Testing – Contains an operational test, segment display test, performance tests and
adjustments.
Chapter 5 Drawings and Parts Lists – Contains exploded views of T71 Indicators, identifying
all serviceable components.
Before servicing the indicator, you should be familiar with the Instruction Manual which is
packed with every indicator.
1.2 SERVICE FACILITIES
To service an indicator, the service area should meet the following requirements:
•Must be protected from electrostatic discharge.
•Should be temperature controlled and meet the indicator specifications for temperature
environmental requirements. See specifications for temperature range.
•Must be free of vibrations such as fork lift trucks close by, large motors, etc.
•Must be free of air currents or drafts from air conditioning/heating ducts, openwindows,
people walking by, fans, etc.
•Area must be clean and air must not contain excessive dust particles.
•Work surface must be stable and level.
•Work surface must not be exposed to direct sunlight or radiating heat sources.

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-2 7000 Series T71 Indicator Service Manual
1.3 TOOLS AND TEST EQUIPMENT REQUIRED
In order to properly service the Indicator, certain special tools and test items are required in
addition to standard electronic tool kits. These items are listed as follows:
1.3.1 Special Tools and Test Equipment List
1. Ohaus Scale Base.
2. Load Cell Simulator optional.
3. Computer with RS232 Interface.
4. RS232 Interface cable.
5. Data Printer for use with RS232 communications.
6. ESD work station or mat.
1.3.2 Standard Tools and Test Equipment List
1. Standard Electronics Tool Kit
2. Digital Voltmeter (DVM), with clip-on probes. Input impedance of at least 10 megohms in
the 1 Volt dc position.
3. Soldering Iron, solder and flux remover.
1.4 Top and Bottom Housing
Figure 1-1. Top and Bottom Housing, and Rear Panel, T71P.
Adjusting
Knobs
Mounting
Bracket
Security screw
4 screws
Battery
Compartment
Power
Receptacle
RS232
Connector
Hole plug
for option
Scale 2 Load Cell Cable Gland
Scale 1 Load Cell
Cable Gland Load Cell Connector for Scale 1

CHAPTER 1 GETTING STARTED
7000 Series T71 Indicator Service Manual 1-3 Ohaus Corporation www.ohaus.com
1.4 Top and Bottom Housing
Figure 1-2. Top and Bottom Housing, and Rear Panel, T71XW.
Adjusting
Knobs
Mounting
Bracket
4 hex-head
bolts
RS232 Cable
Security screw Power Cord
RS232,
Scale 2 RS485/422
Scale 1 Load Cell
Cables
Relay Option Cable

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-4 7000 Series T71 Indicator Service Manual
1.5 SPECIFICATIONS
TABLE 1-1. SPECIFICATIONS
Model T71P T71XW
Maximum Displayed
Resolution 1:50,000
Maximum Approved Resolution 1:10,000
Maximum Counting Resolution 1:500,000
Weighing Units Kg, lb, g, oz, lb:oz, tonnes, custom
Functions Static Weighing, Dynamic Weighing, Parts Counting,
Checkweighing, Percent Weighing, Vehicle Weighing
Display 25 mm / 1 in High, 2-line LCD
Over/Accept/Under Indicators Red, Green, Yellow LED
Backlight White LED
Ingress Protection --- IP66
Load Cell Excitation Voltage 5V DC
Load Cell Drive Up to 8 x 350 ohm load cells
Load Cell Input Sensitivity Up to 3mV/V
Stabilization Time Within 2 seconds
Auto-Zero Tracking Off, 0.5, 1 or 3 divisions
Zeroing Range 2% or 100% of capacity
Span Calibration 1 kg or 1 lb to 100% capacity
Interfaces RS232, External Input; optional Com2*
Overall Dimensions
(W x D x H) (in/mm) 10.2 x 2.7 x 6.6 / 260 x 71 x 168 10.3 x 3.0 x 5.8 / 262 x 76 x 149
Net Weight (lb/kg) 3.3 / 1.5 7.7 / 3.5
Shipping Weight (lb/kg) 5 / 2.3 9.5 / 4.3
Operating Temperature Range –10°C to 40°C / /14°F to 104°F
Main Power 100-240 VAC / 50-60 Hz, Internal Universal Power Supply
Battery Power 6 C-type (LR14) Batteries Rechargeable battery pack
(option)
Rechargeable battery pack
(option)
*Can be either RS232 or RS422/485.

CHAPTER 1 GETTING STARTED
7000 Series T71 Indicator Service Manual 1-5 Ohaus Corporation www.ohaus.com
1.6 HARDWARE SETUP OR DISASSEMBLY
Both the T71P and T71XW connect to a scale base through a Load Cell Cable that connects to
the Indicator’s Main Printed Circuit Board (PCB).
CAUTION:
ELECTRICAL SHOCK HAZARD. REMOVE ALL POWER CONNECTIONS TO THE
INDICATOR BEFORE SERVICING OR MAKING INTERNAL CONNECTIONS.
The process of opening the Housing varies slightly for each model:
T71P:
1. Remove the four Phillips head screws
from the rear housing.
2. Open the housing; disconnect the
ribbon cable from the top of the PCB.
T71XW:
1. Remove the four hex head screws from
the rear housing.
2. Open the housing by carefully pulling
the top of the front housing forward.
Figure 1-2 shows T71’s Main PCB, with connectors, jumpers, terminals and switches indicated.
Figure 1-3. Printed Circuit Board (PCB), T71 Indicator.
1.6.1 Connecting the Scale Base’s Load Cell
The T71P has a circular connector jack on its Bottom Housing. The white plastic six-wire plug
connects to the Scale 1 Load Cell Connector J14. (See Figure 1-3.)
Attach a base without a circular connector to one of the Load Cell Terminal Blocks on the Main
PCB. Pass the load cell cable through a Cable Gland (see Figure 1-1) and attach it to Terminal
Block J4 or Terminal Block J7. (See Figure 1-4.) Tighten the Cable Gland to secure the cable
and maintain a tight seal. Jumper connections must be shorted or opened as follows:
Figure 1-4. Load Cell Terminal Blocks J4 (Scale 1) and J7 (Scale 2).
Power Supply
connector
Battery
connector
(T71P only)
Scale 1 Load Cell
Connector J14
(T71P only)
Real Time
Clock Battery
Scale 2 Load
Cell Terminal
Block J7
Scale 2 Sense
Jumper W4
RS232 Terminal J7
(T71XW only)
External Input
Terminal Block J9
COM2 Connector
J8 (Optional:
RS232 or
RS422/485)
RS232 Connector
(T71P only)
Scale 2 Sense
Jumper W3
Scale 1 Sense
Jumper W2
Scale 1 Sense
Jumper W1
Scale 1 Load Cell
Terminal Block J4
Alibi Option
PCB Connection
Rechargeable
Battery
Connection J3
(T71P opposite side)
Security Switch
SW1

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-6 7000 Series T71 Indicator Service Manual
1.6.2 Jumper Connections
When a 4-wire load cell is attached to terminal block J4, jumpers W1 and W2 must be shorted.
When a 6-wire load cell is attached to terminal block J4, jumpers W1 and W2 must be open.
When a 4-wire load cell is attached to terminal block J7, jumpers W3 and W4 must be shorted.
When a 6-wire load cell is attached to terminal block J7, jumpers W3 and W4 must be removed.
+EXC +SIG -SIG -EXC
+SENS GND -SENS
Figure 1-5. Load Cell wiring.
Pin Connection
1 +Excitation
2 +Sense
3 +Signal
4 GND
5 –Signal
6 –Sense
7 –Excitation
Figure 1-6. Open/shorted jumpers.
1.6.3 RS232 Interface
The T71P has a built-in RS232 Interface: a standard 9-pin D-style female connector on the back
of the T71P Housing. In addition, each model (T71P and T71XW), has an optional COM2
connector, which can be either RS232 or RS422/485. The optional interface is available
separately, with its own instructional manual for installation and configuration.
The RS232 pin configuration for the T71P is illustrated in Figure 1-7, below.
1
2
3
4
5
6
78
9
Figure 1-7. RS232 Pins.
Pin Connection
1 N/C
2 TXD
3 RXD
4 N/C
5 GND
6 N/C
7 CTS
8 RTS
9 N/C
For software setup of the RS232 Interface, through the Indicator’s menu, see Section 1.9.
All other aspects of hardware configuration and setup are described in the Instruction Manual.

CHAPTER 1 GETTING STARTED
7000 Series T71 Indicator Service Manual 1-7 Ohaus Corporation www.ohaus.com
1.7 OPERATION
This section contains information on the basic operation of the Indicator. An exploded view
drawing is included in Chapter 5 which identifies all components of the indicator. The
descriptions in this manual refer to the names of the components identified in the exploded view
drawing with the numbered callout.
1.7.1 Power Supply
Both models have an Internal Universal Power Supply, 100-240 VAC / 50-60 Hz. For the
T71XW, connect the power cord to a properly grounded electrical outlet. For the T71P, connect
the AC power cord to the power receptacle on the rear of the Bottom Housing, then connect the
AC plug to an electrical outlet.
0 % - 5 % charged
5 % - 25 % charged
26 % - 50 % charged
51 % - 75 % charged
76 % - 100 % charged
The T71P indicator can also be operated on six alkaline
batteries (not supplied) when AC power is not available.
It will automatically switch to battery operation if there is power
failure or the power cord is removed. The indicator can
operate for up to 80 hours on battery power.
During battery operation, the battery charge symbol indicates
the battery status. The indicator will automatically turn-off
when the batteries are fully discharged. Figure 1-8. Battery charge
symbol.
1.7.2 OVERVIEW OF THE CONTROLS
Figure 1-9. T71 Display.
1.7.3 OVERVIEW OF THE DISPLAY INDICATORS
Figure 1-10. T71 Display Indicator.
7-segment, 6-digit
LED display
Control Buttons
Capacity label
window
Under, Accept &
Over LEDs
Preset Tare, Tare,
Brutto, Gross,
Memory symbols
Net symbol
Dynamic
symbol
Stable weight
indicator
Center of Zero
indicator
Negative symbol
Kilogram, Gram,
Percent, Pound, Ounce,
Pound:Ounce, Tonne,
Pieces symbols
Battery charge
symbol
Range symbol
Scale symbol
14-segment
display
Keypad

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-8 7000 Series T71 Indicator Service Manual
1.7.4 OVERVIEW OF THE CONTROL FUNCTIONS
TABLE 1-2. FUNCTIONS OF DISPLAY CONTROLS
Button
Primary
Function
(Short
Press)
ON/ZERO
Turns the
Indicator on
If Indicator is
on, sets zero.
PRINT
Sends the
current value to
the COM port if
AUTOPRINT is
set to Off.
FUNCTION
Initiates an
application mode.
Temporarily
displays the
active mode’s
reference data.
TARE
Performs a tare
operation.
LIBRARY
Display the library
data.
Secondary
Function
(Long
Press)
Off
Turns the
Indicator off.
Units
Changes the
weighing unit.
Mode
Allows changing
the application
mode.
Press and hold
allows scrolling
through modes.
Menu
Enter the User
menu.
Edit
Enable editing
the current library
record.
Menu
Function
(Short
Press)
Yes
Accepts the
current menu or
setting.
No
Advances to the
next menu or
menu item.
Rejects the
current setting
on the display
and advances to
the next
available
setting.
Increments the
value.
Back
Moves back
to previous menu
item.
Decrements the
value.
Exit
Exits the User
menu.
Aborts a
calibration in
progress.
Library
Function
(Short
Press)
Yes
Accepts the
current setting.
No
Advances to the
next library or
setting.
Increments the
displayed value.
Back
Moves back
to previous library
or setting.
Decrements the
displayed value.
Exit
Exits the library.

CHAPTER 1 GETTING STARTED
7000 Series T71 Indicator Service Manual 1-9 Ohaus Corporation www.ohaus.com
1.7.4 OVERVIEW OF THE CONTROL FUNCTIONS
TABLE 1-3. FUNCTIONS OF DISPLAY KEYPAD
Button
Primary
Function
(Short
Press)
1
Enter 1 on
the display.
2ABC through 9WXYZ
Enter alphanumeric values on the
display using the multi-tap text entry
method.
. _ -
Enter
decimal
point,
space or
dash on the
display.
0
Enter 0 on
the display.
CLR
Clear the
last
character
from the
display
Secondary
Function
(Long
Press)
1s2
Change
display
between
Scale 1 and
Scale 2.
Info
Show the
Accumulation
statistics on
the display.
+/-
Change the
polarity of
the
displayed
value.
1.7.5 Menu Setup
To enter the Menu Mode, press and hold the TARE/Menu button until MENU appears on the
display. The first upper level menu appears on the display.
Use Yes, No, Back,and Exit to navigate in Menu Mode:
– Yes Allows entry into the displayed menu.
Accepts the displayed setting and advances to the next menu item.
– No Skips by the displayed menu.
Rejects the displayed setting or menu item and advances to the next available item.
– Back Moves backwards through the upper and middle level menus.
Backs out of a list of selectable items to the previous middle level menu.
– Exit Exits from menu directly to the active weighing mode.

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-10 7000 Series T71 Indicator Service Manual
1.7.5 Menu Setup
Table 1-4. T71 MENU STRUCTURE (Part 1).
CAL READOUT
AZT
(2)
OFF
0.5d
1d
3d
LINEARITY1
(1)
END
CAL
END
READOUT
Y
N
Y
UNITMODE
END
UNIT
END
MODE
N
N
Y
Y
ZERO1
(1)
CAL TEST1
RESET YES
NO
CAPACITY1
(2)
SELECT CAP
AND UNIT
GRAD1 (2)
SELECT GRAD
ZERO
RANGE
(2)
2%
100%
STABLE
RANGE
(2)
0.5d
1d
…
5d
AVG
LEVEL
LOW
MED
HIGH
AUTO
TARE
(2)
OFF
ON
ACCEPT
RETAIN
ZERO
(2)
OFF
ON
RESET YES
NO
MANUAL
SEMI
AUTO
OFF
LEVEL
(SECONDS) 0
...
60
WEIGH ON
OFF
PERCENT ON
OFF
VEHICLE ON
OFF
RESET YES
NO
KILOGRAMS
(2) ON
OFF
POUNDS
(2) ON
OFF
GRAMS
(2) ON
OFF
OUNCES
(2) ON
OFF
POUNDS:
OUNCES
(2)
ON
OFF
TONNES
(2) ON
OFF
CUSTOM
(2) OFF
ON
SET FACTOR,
EXP & LSD
COUNT ON
OFF
APW
OPTIMIZE ON
OFF
SETUP
END
SETUP
RESET YES
NO
LFT OFF
ON
BEEPER
VOLUME
OFF
LO
HI
BEEPER
SIGNAL
OFF
ACCEPT
UNDER
OVER
UND-OVR
KEY
BEEP
ON
OFF
BACK
LIGHT
OFF
ON
AUTO
AUTO 5 SEC
...
30
SEC
SHUT
OFF
OFF
SET 1
SET 2
SET 5
GROSS
INDICATOR OFF
Gross
Brutto
N
GMP
PROJ
ID
USER
ID SET
SET
END
GMP
NY
DATE set
type TYPE MDY
DMY
YMD
SET .....
RESET YES
NO
SCALE
ID SET
TIME set
type TYPE 12
24
SET .....
GEO
(1)
00
...
12
…
31
Notes:
(1) Hidden when LFT is ON.
(2) Locked at current setting when LFT is ON.
(3) Hidden when Dual Scale is OFF.
RANGE1
(2)
SINGLE
DUAL
POWER
ON
UNIT
(2)
AUTO
kg
g
lb
oz
lb:oz
t
c
DUAL
SCALE
ON
OFF
LIBRARY ON
OFF
RANGE2
(2)(3)
SINGLE
DUAL
CAPACITY2
(2)(3)
SELECT CAP
AND UNIT
GRAD2 (2)(3)
SELECT GRAD
ZERO2
(1)(3)
SPAN2
(1)(3)
full cap
..
.
.1cap
LINEARITY2
(1)(3)
CAL TEST2
(3)
SPAN1
(1)
fullcap
..
.
.1cap
ACCUMU-
LATE
(2)
OFF
ON
ALIBI ON
OFF
CHECK
WEIGH ON
OFF
NY

CHAPTER 1 GETTING STARTED
7000 Series T71 Indicator Service Manual 1-11 Ohaus Corporation www.ohaus.com
1.7.5 Menu Setup
Table 1-4. T71 MENU STRUCTURE (Part 2).
PRINT-1
AUTO
PRINT
OFF
END
PRNT-1
LIST NO
YES
NY
Content
On Stable
Interval
Continuous
INTER 1S..
.1M..
.
1H
Result
Layout
Load
Load&Zero
On
Stable
Feed Line Feed
4 Line Feed
Form Feed
Format Multiple
Single
Gross
Net
Tare
Header
User ID
Project ID
Scale ID
Off/On/Num
Off/On
Off/On
RESET YES
NO
STABLE
ONLY (2)
OFF
ON
Accept
Difference
Date&Time
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
I/O
EXT
INPUT
RESET YES
NO
Off
Tare
Zero
Print
Funct
Start-Stop
Tare-S-S
END I/O
NY
Input
Beep OFF
ON
Relay
Output
Type
Sequence
Contact
Type Open
Closed
Normal
Hold
Sequence
Simultaneous
b-b-M
Contact
M-b-b
LOCK MENU
CALIBRATE OFF
ON
END
LOCK MENU
NY
RESET YES
NO
SETUP OFF
ON
READOUT OFF
ON
MODE OFF
ON
UNIT OFF
ON
PRINT-1 OFF
ON
PRINT-2 OFF
ON
COM1 OFF
ON
COM2 OFF
ON
GMP OFF
ON
I/O OFF
ON
LOCK KEY
OFF OFF
ON
END
LOCK KEY
NY
RESET YES
NO
ZERO OFF
ON
PRINT OFF
ON
UNIT OFF
ON
FUNCTION OFF
ON
MODE OFF
ON
TARE OFF
ON
MENU OFF
ON
Info Off/On
App Mode Off/On
Name Off/On
PRINT-2
AUTO
PRINT
OFF
On Stable
Interval
Continuous
INTER 1S..
.1M..
.
1H
Load
Load&Zero
On
Stable
RESET YES
NO
STABLE
ONLY (2)
OFF
ON
Accept
COM1
BAUD
PARITY
RESET YES
NO
300
….
9600
….
19200
7EVEN
7ODD
7NoP
8NoP
HandSh
NONE
XONXOFF
HARDWARE
END COM1
NY
ALT
COMMAND
PRINT
TARE
ZERO
ENTER “OFF” OR
ALPHANUMERIC
ENTRY
BAUD
PARITY
RESET YES
NO
300
….
9600
….
19200
7EVEN
7ODD
7NoP
8NoP
HandSh
NONE
XONXOFF
END COM2
NY
ALT
COMMAND
PRINT
TARE
ZERO
ENTER “OFF” OR
ALPHANUMERIC
ENTRY
Stable
OFF
ON
Stable
LOCK
ALL OFF
ON
STOP 1
2STOP 1
2
ADDRESS OFF
01
…
99
Notes:
(1) Hidden when LFT is ON.
(2) Locked at current setting when LFT is ON.
(3) Hidden when Dual Scale is OFF.
END
PRNT-2
LIST NO
YES
NY
Content
Result
Layout
Feed Line Feed
4 Line Feed
Form Feed
Format Multiple
Single
Gross
Net
Tare
Header
User ID
Project ID
Scale ID
Off/On/Num
Off/On
Off/On
Difference
Date&Time
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Info Off/On
App Mode Off/On
Name Off/On
COM2

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-12 7000 Series T71 Indicator Service Manual
mMENU
CALIBRATION mMENU
SET
U
P
SEtUP
D
U
A
L
SCA
L
E
CAL
ZERO
0.000
kg
mMENU
READO
U
T
rEAd
L
A
N
G
U
AGE
LANG
E
N
G
L
ISH
mMENU
M
ODE
LANG
ESPA
N
O
L
rEAd
STAB
L
E
RA
N
GE
0.000 kg
1.7.6 Language Menu Setup
The T71 menus are available in English, Spanish, German, French and Italian. To change the
menu language, press and hold TARE/Menu until MENU appears. When the button is
released, the Legal For Trade status is displayed, followed by the first menu.
To navigate the menus, press No to move to the next menu or Back to move to the previous
one. Press Yes to enter the displayed menu. Press Exit to immediately leave a menu and
return to weighing mode.
The map below shows the steps to enter the Language menu and choose Español.
Figure 1-11. Changing the menu language.
No
Menu
Y
es
Yes No
No
Exit

CHAPTER 1 GETTING STARTED
7000 Series T71 Indicator Service Manual 1-13 Ohaus Corporation www.ohaus.com
ZErO
O
0.000 lb
ZErO lb
DO
N
E
ZErO lb
--
C
--
1.8 CALIBRATION
Four calibration processes are available: Zero, Span, 3-point Linearity and 5-point Linearity
Calibration. In addition, a Calibration Test and Geographical Adjustment Factor setting are
accessible from the CAL menu.
Preliminary Steps:
1. Be sure appropriate calibration masses are available before beginning calibration.
2. Be sure the scale base is level and stable during the entire calibration process.
3. If LFT is set to On, calibration is unavailable.
To set LFT to OFF, see Section 1.10, page 1-19.
Note: To use the LFT mode again after turning it off, it is necessary to have the
Indicator locked and sealed by local Weights and Measures authorities.
4. If the Calibration Menu is locked in the Menu Lock submenu, turn it back on:
– Press and hold TARE/Menu until MENU LFT OFF appears briefly, followed by MENU
CALIBRATION. Press No until MENU MENU LOCK appears. Press Yes.
– L.MENU RESET appears. Press No. L.MENU LOCK CAL appears. Press Yes.
– L.CAL OFF flashes. Press Yes. Then Press Exit to return to weighing mode.
– Open the Indicator and put the Security Switch on the Main PCB in the OFF position.
5. Allow the Indicator to warm up for approximately five minutes after stabilizing to room
temperature.
6. To abort calibration, press the Exit button anytime during the calibration process.
1.8.1 Zero Calibration
Zero calibration uses one calibration point. The zero calibration point is established with no
weight on the scale. Use this calibration method to adjust for a different pre-load without
affecting the span or linearity calibration.
Press and hold TARE/Menu until LFT OFF flashes and CALIBRATION appears.
Press Yes. CAL ZERO appears. Press Yes.
Note: If DUAL SCALE is OFF, the ZERO, SPAN, 3PTLIN, 5PTLIN menu items are displayed.
If DUAL SCALE is ON, the ZERO1, ZERO2, SPAN1, SPAN2, 3PTLIN1, 3PTLIN2,
5PTLIN1, 5PTLIN2 menu items are displayed.
With no load on the scale, press Yes to set the new zero point.
The display shows ZERO --C--, then ZERO DONE and returns to the
current application mode.

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-14 7000 Series T71 Indicator Service Manual
SPAN kg
1
0
SPAN lb
5
SPAN kg
5
SPAN lb
--
C
--
SPAN lb
0
0.000 lb
SPAN lb
DO
N
E
SPAN lb
--
C
--
1.8.2 Span Calibration
Use this calibration method to adjust the zero calibration point and span calibration point,
without affecting the linearity calibration. Be sure there is no load on the scale.
Press and hold TARE/Menu until LFT OFF flashes and CALIBRATION
appears. Press Yes. CAL ZERO appears. Press No.
CAL SPAN appears. Press Yes. SPAN and the current unit of measure
and Span calibration point flash.
Note: To change the span calibration point, press No and enter the
value using the keypad. Then press Yes.
To change the calibration unit of measure, press No to alternate
between kg and lb.
Place the specified calibration weight on the scale and press Yes.
The display shows SPAN --C--, followed by SPAN DONE.
SPAN 0appears. With no load on the scale, press Yes.
The display shows SPAN --C--, followed by SPAN DONE, and returns to
the current application mode.