OHAUS TA152 User manual

SERVICE MANUAL
Traveler™ Scales
Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 [phone]

SERVICE MANUAL
Traveler™ Scales
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 2009 Ohaus Corporation, all rights reserved.
TM Registered trademark of Ohaus Corporation

TABLE OF CONTENTS
Page No.
CHAPTER 1 GETTING STARTED
1.1 Introduction................................................................................................................1-1
1.2 Service Facilities........................................................................................................1-1
1.3 Tools and Test Equipment Required.........................................................................1-2
1.4 Specifications.............................................................................................................1-2
1.5 Scale Operation.........................................................................................................1-5
1.5.1 Overview of the Controls....................................................................................1-6
1.5.2 Overview of the Display Indicators.....................................................................1-7
1.5.3 Power On ...........................................................................................................1-7
1.5.4 Power Off ...........................................................................................................1-7
1.5.5 Menu Setup........................................................................................................1-7
1.5.6 Menu Structure...................................................................................................1-7
1.6 Connecting the RS232 Interface................................................................................1-9
1.6.1 Hardware and Software Setup ...........................................................................1-9
1.6.2 RS232 Commands.............................................................................................1-9
CHAPTER 2 TROUBLESHOOTING
2.1 Troubleshooting.........................................................................................................2-1
2.2 Diagnostic Guide .......................................................................................................2-1
2.2.1 Diagnosis............................................................................................................2-1
CHAPTER 3 MAINTENANCE PROCEDURES
3.1 Preventive Maintenance............................................................................................3-1
3.1.1 Preventive Maintenance Checklist .....................................................................3-1
3.2 Opening the Scale.....................................................................................................3-1
3.3 Replacing the Load Cell.............................................................................................3-2
3.4 Replacing the Printed Circuit Board and Display.......................................................3-2
3.5 Replacing the Auxiliary Display’s Printed Circuit Board.............................................3-3
3.6 Setting/Removing Legal-For-Trade (Only in TAG and SE models)...........................3-3
3.6 Replacing the Function Label....................................................................................3-3
CHAPTER 4 TESTING
4.1. Testing.......................................................................................................................4-1
4.1.1 Test Masses Required...............................................................................................4-1
4.2 Operational Test........................................................................................................4-1
4.3 Segment Display Test................................................................................................4-1
4.4. Performance Tests ....................................................................................................4-1
4.4.1 Repeatability Test...............................................................................................4-2
4.4.2 Off Center Load Test..........................................................................................4-4
4.4.3 Adjusting Off Center Load..................................................................................4-5
4.4.4 Linearity Test......................................................................................................4-6
CHAPTER 5 DRAWINGS AND PARTS LISTS
5-1 Traveler Scales with Square Draft Shield: Housing & Parts......................................5-2
5-2 Traveler 203 Scale with Round Draft Shield: Housing & Parts..................................5-4
5-3 Traveler Scales with No Draft Shield: Housing & Parts.............................................5-6
Appendix A STANDARD CALIBRATION
A.1 Calibration.................................................................................................................A-1
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TABLE OF CONTENTS
Page No.
Appendix B THE SERVICE MENU
B.1 Entering the Service Menu ....................................................................................... B-1
B.2 Ramp........................................................................................................................B-1
B.3 Linear Calibration...................................................................................................... B-2
B.4 Span Calibration....................................................................................................... B-3
APPENDIX C SOFTWARE SERVICE TOOL INSTRUCTIONS
C.1 Hardware and Software Setup..................................................................................C-1
C.2 Configuring the Scale (after replacing the PCB or Load Cell) .................................. C-3
LIST OF TABLES
TABLE NO. TITLE Page No.
1-1 Specifications for TA Models.................................................................................1-2
1-2 Specifications for TAJ Models...............................................................................1-3
1-3 Specifications for TAG Models..............................................................................1-3
1-4 Specifications for SE Models.................................................................................1-4
1-5 Control Functions..................................................................................................1-6
1-6 LCD Display Indicators..........................................................................................1-7
1-7 Menu Structure......................................................................................................1-8
1-8 RS232 Command Table......................................................................................1-10
2-1 Diagnostic Guide...................................................................................................2-2
4-1 Repeatability Worksheet .......................................................................................4-3
4-2 Linearity Test Masses ...........................................................................................4-6
5-1 Traveler Scales with Square Draft Shield: Housing & Parts..................................5-3
5-2 Traveler 203 Scale with Round Draft Shield: Housing & Parts .............................5-5
5-3 Traveler Scales No Draft Shield: Housing & Parts................................................5-7
LIST OF ILLUSTRATIONS
FIGURE NO. TITLE
1-1 Power Connection.................................................................................................1-5
1-2 Battery Installation.................................................................................................1-5
1-3 Transportation Lock on Bottom Housing...............................................................1-5
1-4 Displays for Traveler, Scout SE, Carat & Gold Series (TAJ and TAG).................1-6
1-5 Traveler Display Indicators....................................................................................1-7
1-6 RS232 Interface (PN 71147376 or 72206287)......................................................1-9
1-7 The RS232 Interface connects to the scale through the Bottom Housing.............1-9
3-1 Scale Bottom, with three screws that secure the Housing shown.........................3-1
3-2 Printed Circuit Board and Display .........................................................................3-2
3-3 Auxiliary Display, with top off.................................................................................3-3
4-1 Segment Display...................................................................................................4-1
4-2 Scale drawing of Traveler Load Cell and Weighing Pan.......................................4-5
5-1 Traveler Scales with Square Draft Shield: Housing & Parts..................................5-2
5-2 Traveler 203 with Round Draft Shield: Housing & Parts .......................................5-4
5-3 Traveler Scales with No Draft Shield: Housing & Parts.........................................5-6
C-1 The RS232 Interface connects to the scale through the Bottom Housing............C-1
C-2 RS232 Interface (PN 71147376 or 72206287).....................................................C-1
C-2 Com Port Configuration screen with default settings ...........................................C-2
C-3 Config Tool’s Test Command screen...................................................................C-2
C-4 Config Tool’s Configuration Screen......................................................................C-3
Traveler™ Series Scales: Service Manual ii Ohaus Corporation www.ohaus.com

CHAPTER 1 GETTING STARTED
1.1 INTRODUCTION
This service manual contains the information needed to perform routine maintenance and
service on the Ohaus Traveler Series scales. Familiarity with the scale’s Instruction Manual is
assumed. The contents of this manual are contained in five chapters:
Chapter 1 Getting Started – Contains information on service facilities, tools and test
equipment, specifications, and the mechanical and electronic functions of the scale.
Chapter 2 Troubleshooting – Contains a diagnostic guide and error code table.
Chapter 3 Maintenance Procedures – Contains preventive maintenance procedures and
disassembly, repair and replacement procedures.
Chapter 4 Testing – Contains a list of required test masses, an operational test, segment
display test, performance tests and adjustments.
Chapter 5 Drawings and Parts Lists – Contains exploded views of Valor 3000 scales
identifying all serviceable components.
Appendix A Standard Calibration – Explains procedures for Standard Calibration, performed
prior to using a scale, and after service.
Appendix B Service Calibration – Describes the Service Menu, which allows authorized
service personnel to perform factory Linearity and Span calibrations (no pre-set limits), and
take Ramp readings.
Appendix C Software Service Tool Instructions –Used to reconfigure the scale after
replacing a Printed Circuit Board or Load Cell.
1.2 SERVICE FACILITIES
To service a scale, the service area should meet the following requirements:
•Should be temperature controlled and meet scale specifications for temperature
environmental requirements.
•Must be free of vibrations such as fork lift trucks close by, large motors, air currents or
drafts from air conditioning/heating ducts, open windows, people walking by, fans, etc.
•Area must be clean and free of excessive dust.
•Work surface must be stable and level.
•Scale must not be exposed to direct sunlight or radiating heat sources.
•Use an approved Electro-Static Device
Traveler™ Series Scales Service Manual 1-1 Ohaus Corporation www.ohaus.com

CHAPTER 1 GETTING STARTED
1.3 TOOLS AND TEST EQUIPMENT REQUIRED
Common hand tools are sufficient to disassemble the Traveler scales. For reconfiguring the
scale after replacing a Printed Circuit Board or Load Cell, an RS232 Interface is required.
(PN 71147376 or 72206287.)
1.4 SPECIFICATIONS
Complete specifications for the Ohaus Traveler Scales are listed in Table 1-2. When a scale has
been serviced, it must meet the specifications listed in the table. Before servicing the scale,
determine what specifications are not met.
TABLE 1-1. SPECIFICATIONS FOR TA MODELS
Model TA152 TA301 TA302 TA501 TA1501 TA3001 TA5000
Capacity (g) 150 300 300 500 1500 3000 5000
Readability (g) 0.01 0.01 0.1 0.1 0.1 0.1 1
Linearity (g) (+/-) ±1 ±1 ±1 ±1 ±1 ±1 ±1
Repeatability (g) ±0.7 ±0.7 ±0.7 ±0.7 ±0.7 ±0.7 ±0.7
Off Center Load (d)
(½ Load, ½ Distance) ±1 ±1
±1 ±1 ±1 ±1 ±1
Span Mass (g) *100 *200 *200 500 1000 2000 4000
Linearity Masses (g) 50
100 100 200 100 200 200 400 500 1000 1000 2000 2000 4000
Weighing Units Gram, Newton
Tare range To capacity by subtraction
Stabilization Time ≤3 seconds
Operating
Temperature Range 50° - 104°F / 10° - 40°C
Operating Humidity
Range 30% - 90%
Pan Size (mm) 120 dia. 123 x 124
Ohaus Corporation www.ohaus.com 1-2 Traveler™ Series Scales Service Manual

CHAPTER 1 GETTING STARTED
1.4 SPECIFICATIONS
TABLE 1-2. SPECIFICATIONS FOR TAJ MODELS
Model TAJ203 TAJ202 TAJ402 TAJ501 TAJ602 TAJ2001 TAJ4001 TAF6000
Capacity (g) 200 ct 200 400 500 600 2000 4000 6000
Readability (g) 0.005 ct 0.01 0.01 0.1 0.1 0.1 0.1 1
Linearity (g) (+/-) ±1 ±1 ±1 ±1 ±2 ±1 ±1 ±1
Repeatability (g) 0.015 ct 0.01 0.01 0.1 0.1 0.1 0.1 1
Off Center Load (d)
(½ Load, ½ Distance) ±1 ±1 ±1 ±1 ±1 ±1 ±1 ±1
Span Mass (g) *20 200 *200 *300 300 1000 2000 3000
Linearity Masses (g) 20
40 100 200 200 400 300 500 300 600 1000 2000 2000 4000 3000 6000
Weighing
Units/Modes Gram, Grain, Carat, Kilogram1, Ounce, Ounce Troy, Taels Hong Kong, Taels
Taiwan, Taels Singapore, Tola, Tical, Pennyweight, Pound2, Parts Counting
Tare range To capacity by subtraction
Stabilization Time ≤3 seconds
Operating
Temperature Range 50° - 104°F / 10° - 40°C
Operating Humidity
Range 30% - 90%
Pan Size (mm) 100 dia. 137 x 140
1 TAJ2001, TAJ4001, TAJ6000 models only. 2 TAJ501, TAJ602, TAJ2001, TAJ4001, TAJ6000 models only.
TABLE 1-3. SPECIFICATIONS FOR TAG MODELS
Model TAG152 TAG302 TAG1501 TAG3001
Capacity (g) 150 300 1500 3000
Readability (g) 0.01 0.1 0.1 0.1
Linearity (g) (+/-) ±1 ±1 ±1 ±1
Repeatability (g) 0.01 0.1 0.1 0.1
Off Center Load (d) (½ Ld, ½ Dist) ±1 ±1 ±1 ±1
Span Mass (g) *100 *200 1000 2000
Linearity Masses (g) 100 / 150 200 / 300 1000 / 1500 2000 / 3000
Weighing Units Gram, Newton
Tare range To capacity by subtraction
Stabilization Time ≤3 seconds
Operating Temperature Range 50° - 104°F / 10° - 40°C
Operating Humidity Range 30% - 90%
Pan Size (mm) 120 dia. 123 x 124
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CHAPTER 1 GETTING STARTED
1.4 SPECIFICATIONS
TABLE 1-4. SPECIFICATIONS FOR SE MODELS
Model SE202 SE302 SE402 SE600 SE602 SE3001 SE4001 SE6000 SE6001
Capacity (g) 200 300 400 600 600 3000 4000 6000 6000
Readability (g) 0.01 0.01 0.01 1 0.01 0.1 0.1 1 1
Linearity (g)
(+/-) ±1 ±1 ±1 ±2 ±2 ±1 ±1 ±1 ±1
Repeatability
(g) 0.01 0.1 0.01 0.1 0.1 0.1 0.1 1 1
Off Center
Load (d)
(½ Load,
½ Distance) ±1 ±1 ±1 ±1 ±1 ±1 ±1 ±1 ±1
Span Mass (g) 200 *200 *200 300 300 2000 2000 3000 3000
Linearity
Masses (g) 100
200 200 300 200 400 300 600 300 600 2000 3000 2000 4000 3000 6000 3000 6000
Weighing
Units/Modes Carat, Gram, Ounce, Pound, Parts Counting, Spec. GR
Tare range To capacity by subtraction
Stabilization
Time ≤3 seconds
Operating
Temperature
Range 50° - 104°F / 10° - 40°C
Operating
Humidity
Range 30% - 90%
Pan Size
(mm) 137 x 140
Ohaus Corporation www.ohaus.com 1-4 Traveler™ Series Scales Service Manual

CHAPTER 1 GETTING STARTED
1.5 SCALE OPERATION
This section contains information on the basic operation of the scale.
Either the AC adapter or battery power may be
used to power the scale. Connect the AC
adaptor plug to the input jack on the back of
the scale. (See Figure 1-1.)
Figure 1-1. Power connection.
To use batteries, remove the battery cover
and install four alkaline AA (LR6) batteries,
(not included). (See Figure 1-2.)
Under battery power a battery symbol is
shown on the left side of the display.
The Auto-Off setting is useful for conserving
battery power. Setting it on (in the Setup
menu) will automatically turn the scale off after
no activity is detected for 4 minutes.
Figure 1-2. Battery installation.
Before operating the scale, check
that the Transportation Lock is in the
unlock position. Otherwise the
scale will not be able to weigh
correctly. (This lock is used to
protect the scale’s moving parts
during transport.)
Allow time for the scale to stabilize
after moving it from an area which is
at a different temperature than the
area where it is to be operated.
Allow one hour for each 5°F (2.7°C)
temperature change before using the
scale. After temperature
stabilization, allow an additional 20
minutes after turning the scale on,
for the scale electronics to stabilize.
Transportation
Lock should be
in unlocked
position.
Figure 1-3. Transportation Lock on Bottom Housing.
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CHAPTER 1 GETTING STARTED
1.5.1 OVERVIEW OF THE CONTROLS
M
Figure 1-4. Displays for Traveler, Scout SE, Carat & Gold Series (TAJ and TAG).
TABLE 1-5. CONTROL FUNCTIONS
Key
Name Function
Primary function (Short Press) – If scale is Off, turn it On.
If scale is on, perform Zero/Tare function.
Secondary function (Long Press) – Turn scale Off.
On-Zero
Off
Yes Menu function – (Yes) Used to accept the currently displayed setting.
Primary function (Short Press) – Send the current display value to serial
port if installed.
Print
Cal Secondary function (Long Press) – Starts Span calibration.
Primary function (Short Press) – Advances to next available unit.
Unit Menu function – (No) Used to reject the displayed setting and advance to
next available setting.
No
Ohaus Corporation www.ohaus.com 1-6 Traveler™ Series Scales Service Manual

CHAPTER 1 GETTING STARTED
1.5.2 OVERVIEW OF THE DISPLAY INDICATORS
1
2 Figure 1-5. Traveler LCD Display Indicators.
3 4
TABLE 1-6. LCD DISPLAY INDICATORS
No. Function
1 Indicates that the scale has found the center of zero.
2 Indicates that the measured value has become stable.
3 Standard (7) segment numeric characters. Six characters are available and are used for
displaying weight values.
Symbols for weighing modes. (Only g– Grams, and N– Newtons are available.)4
1.5.3 Power ON
Press On-Zero/Off.All segments will appear briefly followed by a software revision number,
and then * 0.00g. Allow 20 minutes warm-up time. The scale should be calibrated before use.
(See Appendix A.)
1.5.4 Power OFF
To turn the scale OFF, press and hold On-Zero/Off until the display indicates OFF,then
release.
1.5.5 Menu Setup
Programmable features of the Traveler scales are contained in menus which are accessed
through the Display Panel’s control switches. See the Instruction Manual for a full description of
the menus and how to access them.
1.5.6 Menu Structure
The Menu Structure and default settings are shown in Table 1-7, next page.
Traveler™ Series Scales Service Manual 1-7 Ohaus Corporation www.ohaus.com

CHAPTER 1 GETTING STARTED
1.5.6 Menu Structure TABLE 1-7. MENU STRUCTURE
Setup
A-off On
Light Off
Span Yes
Lin Yes
End Yes
Unit
ct off
GN off
g on
kg off
N off
oz off
ozt off
thk off
tsg off
ttw off
tola off
tical off
dwt off
lb off
lb:oz off
PC Off
% Off
Hold Off
Totalize Off
Spec. Gr Off
C Off
End Yes
Print*
Stable Off
APrint Off
End Yes
RS232*
ON-OFF on
Baud 2400
Bits/ Parity
7/none
Handshake
none
End Yes
USB*
ON-OFF on
Baud 2400
Bits/ Parity
7/none
Handshake
none
End Yes
EndYes
*Print, RS232, and USB menus are only seen after the corresponding interface is installed.
Menu selections in bold are default settings.
Ohaus Corporation www.ohaus.com 1-8 Traveler™ Series Scales Service Manual

CHAPTER 1 GETTING STARTED
1.6 Connecting the RS232 Interface
The RS232 Interface (sold separately, see
Figure 1-6) facilitates two-way communication
between the Traveler scale and a personal
computer. The interface connects to the scale
through the Bottom Housing: see Figure 1-7.
Figure 1-7. The RS232 Interface connects
to the scale through the Bottom Housing.
1.6.1 Hardware Setup
1. Insert the RS232 Interface in the receptacle in the Bottom Housing.
(See Figure 1-7.)
2. Connect the cable to an RS232 port on the computer, printer or other device.
3. Set the communications parameters to match on both devices
1.6.2 RS232 Commands
All communication is accomplished using standard ASCII format. Only the characters shown in
the RS232 Command Table 1-8 are acknowledged by the balance. Invalid command response
"ES" error indicates the balance has not recognized the command. Commands sent to the
balance must be terminated with a carriage return (CR) or a carriage return-linefeed
(CRLF). Data output by the balance is always terminated with CRLF.
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CHAPTER 1 GETTING STARTED
1.6.2 RS232 Commands
TABLE 1-8. RS232 COMMAND TABLE
Command Function
0A Turns Auto print off
Same function as pressing the PRINT/Cal key (start print, stop Auto print or re-start it)P
SA Auto print on stable
CA Auto print on stable
(n)A Auto print on 1 to 3600 second intervals (n = 1 to 3600)
Same as pressing On-ZeroT
V Print software version
LE Prints last error code, i.e. [Err 0]
0S Print unstable data
1S Print stable data only
C Initiate Span calibration
L Initiate Linearity calibration
0M Gram mode
1M Ounce mode
2M Troy ounce mode
3M Pennyweight mode
4M Parts counting mode
5M Pound Mode
6M Newton
7M Kg
8M Lb:oz
9M %
(esc)ddddaaaW Write word dddd to EEPROM address aa
(esc)aaR Read word from EEPROM address aa
(esc)MFG Temporarily set the scale to MFG mode, without changing the content of EEPROM
(esc)P Print raw weigh data. Data is filtered, and compensated.
(esc)T Print raw temperature data
(esc)C Turn on all CLD segments. (Press any button to turn it off.)
(esc)@ Toggle On/Off ‘continuous print’ of filtered raw weight and raw temperature data.
Ohaus Corporation www.ohaus.com 1-10 Traveler™ Series Scales Service Manual

CHAPTER 2 DIAGNOSTIC GUIDE
2.1 TROUBLESHOOTING
This section of the manual contains troubleshooting information. Information is contained to
isolate specific problems using Table 2-1, Diagnostic Guide Follow all directions step by step.
Make certain that the work area is clean. Handle balance components with care. Use
appropriate Electro-Static Device.
2.2 DIAGNOSTIC GUIDE
Table 2-1 is a Diagnostic Guide designed to help locate the problem area quickly and easily.
The probable causes are listed with the most common cause first. If the first remedy does not
fix the problem, proceed to the next remedy. Before attempting to repair the balance, read all
chapters of this manual to be familiar with the balance components and operation.
2.2.1 Diagnosis
1. Isolate and identify the symptom
2. Refer to Table 2-1, Diagnostic Guide and locate the symptom.
3. Follow the suggested remedies in the order they appear.
4. Perform the indicated checks, or see the appropriate section of the manual.
5. Repair or replace the defective section of the balance.
NOTE:
If more than one symptom is observed, approach one area at a time,
and remember that the symptoms may be interrelated.
If a problem arises that is not covered in this manual, contact Ohaus Corporation for further
information.
Traveler™ Series Service Manual 2-1 Ohaus Corporation www.ohaus.com

CHAPTER 2 DIAGNOSTIC GUIDE
2.2.1 Diagnosis
TABLE 2-1. DIAGNOSTIC GUIDE
Symptom Possible Cause Remedy
Cannot turn on No power to scale
PCB defective
Verify connections and voltage.
Replace batteries, check polarity.
Replace PCB.
Poor accuracy Improper calibration
Unstable environment
Transportation lock is set
Debris touching the pan
Draft shield is touching the pan
or sample
Damaged Load Cell
Perform calibration.
Move scale to suitable location
Slide the pin to the unlocked position.
(See Figure 1-3.)
Clean debris next to or under the pan.
Check that pan is installed properly,
check sample height.
Replace Load Cell.
Cannot calibrate Unstable environment
Incorrect calibration weight
Transportation lock is set.
Calibration lock switch is set.
Move the scale to suitable location.
Use correct calibration weight
Slide the pin to the unlocked position.
Slide switch to the unlocked position.
Err 1 Invalid checksum data. Cycle scale off/on.
See Appendix C to restore data.
Replace PCB.
Err 2 Overload or under load
condition.
Transportation lock is set.
Scale does not Ramp properly.
Improper calibration.
Load Cell is damaged.
Main PCB is damaged.
Verify pan is installed and/or excess
load is removed from pan.
Slide the pin to the unlocked position.
Check Ramp. (See Appendix B.)
Perform Service Calibration.
Replace Load Cell
Replace PCB.
Err 4 Invalid calibration mass. Verify correct calibration mass is used.
Err 8 RS232 buffer is full. Cycle scale Off/On.
Check RS232 settings in scale and
computer when RS232 option is
installed.
Err 9 Internal data error. Restore data. (See Appendix C.)
Replace PCB.
Battery symbol
flashing Battery power is low. Replace batteries soon.
Batt Low message Battery power is too low for
proper operation. Replace batteries.
Ohaus Corporation www.ohaus.com 2-2 Traveler™ Series Service Manual

CHAPTER 3 MAINTENANCE PROCEDURES
3.1 PREVENTIVE MAINTENANCE
Ohaus scales are precision instruments and should be carefully handled, stored in a clean, dry,
dust-free area, and cleaned periodically. Follow these precautionary steps:
– When a scale has had chemicals or liquids spilled on it, all exterior surfaces should be
cleaned as soon as possible with warm water on a damp cloth.
– Do not leave a mass on the scale when the scale is not in use.
– Allow time for the scale to stabilize after moving it from an area which is at a different
temperature than the area where it is to be operated. Allow one hour for each 5°F
(2.7°C) temperature change before using the scale. After temperature stabilization,
allow an additional hour after turning the scale on, for the scale electronics to stabilize.
3.1.1 Preventive Maintenance Checklist
The scale should be inspected and checked regularly, as follows:
1. Remove the Pan and Sub Pan to inspect and clean the area beneath the Pan.
2. Clean the outside of the scale using a damp cloth with warm water.
CAUTION
DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE.
SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE’S FINISH.
3. Check the Power Cord for broken or damaged insulation.
4. If using batteries and the scale malfunctions, first replace the batteries to see if this
resolves the problem. The Traveler takes four “C” (LR 14) batteries.
5. Make a visual inspection for faulty connectors, wiring, and loose hardware.
3.2 OPENING THE SCALE
Turn the scale off and unplug the power cord and remove batteries before you begin.
1. Remove the Weighing Pan; then turn the Sub-Pan in a clockwise direction to lift it off.
2. Turn the scale over. Remove the
three screws shown in Figure 3-1.
3. Turn the scale back on its feet, and
lift off the Housing. The internal
parts – the Load Cell and Printed
Circuit Board (PCB) – are now
accessible.
Note: When replacing the Weighing
Pan and Sub-Pan (the reverse of Step
1), turn the Sub-Pan slightly in a
counter-clockwise direction to secure it.
Screws that
secure the
Housing
Figure 3-1. Scale Bottom, with three screws
that secure the Housing shown.
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