OHAUS T32ME User manual

SERVICE MANUAL
3000 Series
T32ME & T32MC Indicators
T32ME T32MC
Ohaus Corporation 7 Campus Drive, Suite 310, Parsippany, NJ 07054 [phone]

SERVICE MANUAL
3000 Series T32 Indicators:
T32ME & T32MC
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 2011 Ohaus Corporation, all rights reserved.
TM Registered trademark of Ohaus Corporation.

TABLE OF CONTENTS
3000 Series T32ME & MC Indicators Service Manual iOhaus Corporation www.ohaus.com
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 Specifications.............................................................................................................1-3
1.5 Hardware Setup or Disassembly...............................................................................1-4
1.5.1 Jumper Connections ..........................................................................................1-5
1.5.2 RS232 Interface .................................................................................................1-5
1.6 Overview of the Controls ...........................................................................................1-6
1.7 Operation...................................................................................................................1-7
1.7.1 Power On ...........................................................................................................1-7
1.7.2 Power Off ...........................................................................................................1-7
1.7.3 Menu Setup........................................................................................................1-7
1.8 RS232 Interface Connection......................................................................................1-8
1.8.1 Setting Communications Parameters.................................................................1-8
1.8.2 Interface Commands..........................................................................................1-9
1.8.3 Output Format ....................................................................................................1-9
1.9 Legal For Trade (LFT) .............................................................................................1-10
CHAPTER 2 TROUBLESHOOTING
2.1 Introduction................................................................................................................2-1
2.2 Visual Inspection........................................................................................................2-1
2.3 Error Codes ...............................................................................................................2-2
2.4 Problem Solver..........................................................................................................2-3
CHAPTER 3 MAINTENANCE PROCEDURES
3.1 Preventive Maintenance............................................................................................3-1
3.1.1 Preventive Maintenance Checklist .....................................................................3-1
3.2 Testing and Replacement of Major Components ......................................................3-1
3.3 Testing the Printed Circuit Board (PCB)....................................................................3-2
3.3.1 PCB Voltage Measurements............................................................................3-2
3.3.2 Simulator Testing .............................................................................................3-2
3.3.2.1 How Strain Gauge Load Cells Operate....................................................3-3
3.3.2.2 How to Operate Simulators ......................................................................3-4
3.3.2.3 Correcting Underload and Overload Errors..............................................3-5
3.3.2.4 General Load Test....................................................................................3-5
3.3.2.5 Calibration Test ........................................................................................3-5
3.4 Replacing the Printed Circuit Board (PCB)................................................................3-6
3.5 Cable Set Replacement.............................................................................................3-6
3.6 Function Label Replacement.....................................................................................3-7
CHAPTER 4 TESTING
4.1. Testing.......................................................................................................................4-1
4.2 Power Test.................................................................................................................4-1
4.3 Performance Tests Using a Scale Base....................................................................4-1
4.3.1 Overload/Underload Test ...................................................................................4-2
4.4 Performance Tests Using a Load Cell Simulator.......................................................4-2
4.5 Calibration Retention Test.........................................................................................4-2
4.6 RS232 Interface Test/Print Test ................................................................................4.2

TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com ii 3000 Series T32ME & MC Indicators Service Manual
CHAPTER 5 PARTS LISTS & DIAGRAMS Page No.
5-1 3000 Series T32MC (LCD) Indicator: Housing & Internal Parts ................................5-2
5-2 3000 Series T32ME (LED) Indicator: Housing & Internal Parts.................................5-4
APPENDIX A SETUP & CALIBRATION VALUES
A.1 Preliminary Steps .............................................................................................. A-1
A.2 Span Calibration................................................................................................ A-2
A.3 Linearity Calibration........................................................................................... A-2
A.4 Setup & Calibration Values ............................................................................... A-3
APPENDIX B GEOGRAPHICAL ADJUSTMENT
B.1 Geographical Adjustment Factor.............................................................................. B-1
LIST OF TABLES
TABLE NO. TITLE Page No.
1-1 Specifications........................................................................................................1-3
1-2 Functions of Display Controls................................................................................1-6
1-3 T32 Menu Structure ..............................................................................................1-7
1-4 Serial Interface Command Table...........................................................................1-9
1-5 Default Serial Output Format.................................................................................1-9
2-1 Error Codes...........................................................................................................2-2
2-2 Problem Solver......................................................................................................2-3
5-1 T32MC (LCD) Indicator: Housing & Internal Parts................................................5-3
5-2 T32ME (LED) Indicator: Housing & Internal Parts.................................................5-5
A-1 Setup & Calibration Values .................................................................................. A-3
B-1 Geographical Adjustment Values......................................................................... B-1
LIST OF ILLUSTRATIONS
FIGURE NO. TITLE
1-1 Four screws on rear panel.....................................................................................1-4
1-2 Printed Circuit Board (PCB), T32 Indicator ...........................................................1-4
1-3 Load Cell wiring.....................................................................................................1-4
1-4 Open/shorted jumpers...........................................................................................1-4
1-5 Rear panel.............................................................................................................1-5
1-6 RS232 Pins ...........................................................................................................1-5
1-7 T32MC Display......................................................................................................1-6
1-8 T32ME Display......................................................................................................1-6
1-9 T32 Wire Seal .....................................................................................................1-10
1-10 T32 Paper Seal ...................................................................................................1-10
2-1 Visual Checking Procedures.................................................................................2-1
3-1 Main PCB’s AC power supply jack. Place DVM probes into rear sockets.............3-2
3-2 Load Cell and RS232 terminals on Main PCB ......................................................3-2
3-3 Load Cell terminals close-up.................................................................................3-2
3-4 Typical Strain Gauge Load Cell.............................................................................3-3
3-5 Downward force on Load Cell bends the beam ....................................................3-3
3-6 Load Cell input and output through Wheatstone Bridge circuit.............................3-3
3-7 Typical Indicator Printed Circuit Board (PCB).......................................................3-4
3-8 Load Cell wiring.....................................................................................................3-4
3-9 Simulator connects to Wheatstone Bridge, replacing load cell .............................3-4
3-10 Preferred 0 and max settings................................................................................3-5

TABLE OF CONTENTS
3000 Series T32ME & MC Indicators Service Manual iii Ohaus Corporation www.ohaus.com
FIGURE NO. TITLE Page No.
3-11 Main PCB..............................................................................................................3-6
5-1 Series 3000 T32MC Indicator: Housing & Internal Parts.......................................5-2
5-1 Series 3000 T32ME Indicator: Housing & Internal Parts.......................................5-4

TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com iv 3000 Series T32ME & MC Indicators Service Manual

CHAPTER 1 GETTING STARTED
3000 Series T32ME & MC 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 T32ME and T32MC 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, operating the Indicator, and configuring the
Indicator’s communication and Legal-for-Trade menus.
Chapter 2 Troubleshooting – Contains a problem solver 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 T32 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, open windows,
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 3000 T32ME & MC 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 for testing the RS232 communications.
4. RS232 Interface cable. (25-pin: PN 80500524; 9-pin: PN 80500525)
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.

CHAPTER 1 GETTING STARTED
3000 Series T32ME & MC Indicator Service Manual 1-3 Ohaus Corporation www.ohaus.com
1.4 SPECIFICATIONS
TABLE 1-1. SPECIFICATIONS
Model T32MC T32ME
Capacity Range 5 to 20,000 kg or lb
Maximum Displayed
Resolution 1:20,000
Approved Resolution 1:6,000
Minimum Avg. Piece Weight 1d
Weighing Units Kg, lb, g, oz, lb:oz
Functions Weighing, Parts Counting, Display Hold, Checkweigh, Totalize
Display 1 in/2.5 cm digit height, 6-
digit, 7-segment backlit LCD 0.8” / 20mm digit height, 6- digit, 7-segment Red LED
Backlight White LED
Keypad 4-button membrane switches
Load Cell Excitation Voltage 5V DC
Load Cell Drive Up to 4 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 5 kg or 5 lb to 100% capacity
Interface RS232
Overall Dimensions
(W x D x H) (in/mm) 7.8 x 1.8 x 5.2 / 198 x 46 x 132
Net Weight (lb/kg) 1.5 / 0.7
Shipping Weight (lb/kg) 4.0 / 1.8
Operating Temperature Range –10°C to 40°C / /14°F to 104°F
Power 9 – 12 VDC, 0.5A, AC Adapter

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-4 3000 T32ME & MC Indicator Service Manual
1.5 HARDWARE SETUP
Both the T32ME and T32MC connect to a scale base through a Load Cell Cable that connects
to the Indicator’s Main Printed Circuit Board (PCB). When supplied as part of a scale, each
model has a mounting bracket that attaches to the column bracket of the base scale. To
remove the mounting bracket, remove the threaded knobs, holding the Indicator by hand.
CAUTION:
ELECTRICAL SHOCK HAZARD. REMOVE ALL POWER CONNECTIONS TO THE
INDICATOR BEFORE SERVICING OR MAKING INTERNAL CONNECTIONS.
Remove the four screws from the rear
housing. (See Figure 1-1.)
Carefully open the housing.
Figure 1-2 shows connectors, jumpers,
terminals and switches on the Main
PCB. The Load Cell Cable connects to
Terminal Block J7.
Figure 1-1. Four screws on Housing.
Figure 1-2. Printed Circuit Board (PCB), T32 Indicator
Figure 1-3. Load Cell wiring.
LFT On/Off
Switch Power Supply
Input J1
Sense
Jum
p
er W2
Load Cell
Terminal
Block J7
RS232
Connector J3
Sense
Jum
p
er W1

CHAPTER 1 GETTING STARTED
3000 Series T32ME & MC Indicator Service Manual 1-5 Ohaus Corporation www.ohaus.com
1.5.1 Jumper Connections
For a 4-wire load cell with no sense wires,
short Jumpers W1 and W2.
For a 6-wire load cell with sense wires,
open Jumpers W1 and W2.
For load cells with a ground shield wire,
connect the shield to the center position (GND). Figure 1-4. Jumpers.
1.5.2 RS232 Interface
Each model has a standard 9-pin D-style RS232 connector, with a pin configuration as
illustrated in Figure 1-7.
Figure 1-5. Bottom of Housing.
1
2
3
4
5
6
78
9
Figure 1-6. RS232 Pins.
Pin Connection
1 N/C
2 TXD
3 RXD
4 N/C
5 GND
6-9 N/C
To adjust RS232 settings, see Section 1.8, page 1-8.
RS232
connector

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-6 3000 T32ME & MC Indicator Service Manual
1.6 OVERVIEW OF THE CONTROLS
Figure 1-7. T32MC (LCD) Display. Figure 1-8. T32ME (LED) Display.
TABLE 1-2. FUNCTIONS OF DISPLAY CONTROLS
Button
Primary
Function
(Short Press)
ON/ZERO
Turns the
Indicator on.
PRINT
Sends the current
value to the COM
port if AUTOPRINT
is set to Off.
FUNCTION
Initiates an
application
mode.
TARE
Performs a tare
operation.
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.
Extended press:
View the Audit
Trail event
counters
Menu
Function
(Short Press)
Yes
Accepts the
current setting
on the display.
No
Advances to the
next menu or
menu item.
Rejects the current
setting on display,
advances to next
available setting.
Increments value.
Back
Moves back
to previous menu
item.
Decrements the
value.
Exit
Exits User menu.
Aborts calibration.
Symbols for Pounds,
Ounces, Kilograms, Grams Checkweigh
indicators
Indicators for Center of Zero, Hold, Accumulation Mode, (also Stable weight on T32ME)
Counting (PCS) Mode, Net weight, & Calibration Mode.
Stable weight
indicator

CHAPTER 1 GETTING STARTED
3000 Series T32ME & MC Indicator Service Manual 1-7 Ohaus Corporation www.ohaus.com
1.7 OPERATION
1.7.1 Power ON
To turn the indicator on, press ON/ZERO/Off (short press). The indicator performs a display
test, momentarily displays software version, and then enters the active weighing mode.
1.7.2 Power OFF
To turn the power off, press ON/ZERO/Off (long press). The indicator shuts down.
1.7.3 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.
Table 1-3. T32 MENU STRUCTURE
Content

CHAPTER 1 GETTING STARTED
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1.8 RS232 INTERFACE CONNECTION
The T32 has a bi-directional RS232 interface for communication with printers and computers.
When communication is used, data can be output various ways, depending on PRINT menu
settings.
For RS232 cable connections, see Section 1.5.2, page 1-5.
1.8.1 Setting Communications Parameters
The T32 Indicator’s default communication parameters are baud rate 9600 bits per second
(bps), 8 databits, no parity,Handshake XON/XOFF, Stable Only Off, and Autoprint Off.
To change these settings use the PRINT menu, as follows:
1. Press and hold TARE/Menu until C.A.L. appears. Press No. S.E.t.U.P appears.
Press No. r.E.A.d appears. Press No. M.O.d.E appears. Press No. U.N.I.t appears.
Press No. P.r.i.n.t appears. Press Yes. rESEt appears. Press No.
2. bAUd appears. Press Yes.
3. The default Baud rate setting, 9600 bps, appears. To change the setting, press No.
The menu cycles to the next setting each time you press No: first 9600, then 300, 600,
1200, 2400, 4800, and 9600 again. Press Yes when the desired setting appears. bAUd
appears again. Press No.
4. PAritY appears. Press Yes. The default Parity setting, 8
NONE, appears. To change the setting, press No.
5. The menu cycles to the next setting each time you press No:
first 7 Even, then 7 Odd, 7 None, and 8 None again. Press Yes
to accept a setting. PAritY appears again. Press No.
6. StOP appears. Press Yes. The default Stop Bit setting, 1, appears.
To change the setting, press No.
7. The menu toggles to the next setting each time you press No:
first 1, then 2, then 1 again. Press Yes when the desired setting
appears. StOP appears again. Press No.
8. HANd appears. Press Yes. The default Handshake setting, On-Off (Xon/Xoff),
appears. To change the setting, press No.
9. The menu toggles to the next setting each time you press No: first Off,
then On-Off, then Off again. Press Yes when the desired setting
appears. HANd appears again. Press No.
10. StAbLE appears. Press Yes. The Stable setting allows the Indicator to print values
only when the stability criteria are met. To choose ON, press Yes. If you press No, Off
appears. Press Yes to accept a setting. Then StAbLE appears. Press No.
11. A.Print appears. Press Yes. Auto Print sets printing to occur each
time stability criteria are met (ON.StAB), or at a defined interval
(INtEr), or continuously (CONt). The default setting is Off. Press No
until the preferred setting appears. Then press Yes. A.Print appears.
Press No. INtEr appears.
12. If INtEr was selected, use the INtEr sub-menu to set the interval, from 1 to 3600
seconds. Press No to advance, Back to regress, and Yes to accept a setting. After you
press Yes, INtEr appears again. Press No twice, then Yes when End appears, No when
P.r.i.n.t appears, No again, and Yes when End appears again to exit menu mode.

CHAPTER 1 GETTING STARTED
3000 Series T32ME & MC Indicator Service Manual 1-9 Ohaus Corporation www.ohaus.com
1.8.2 Interface Commands
The RS232 Interface enables a computer to be used to control some functions of the Indicator
using the commands listed in Table 1-4.
TABLE 1-4. SERIAL INTERFACE COMMAND TABLE.
Command Function
IP Immediate Print of displayed weight (stable or unstable).
P Print stable displayed weight (according to stability setting).
CP Continuous Print
SP Print when stable.
xP Interval Print x = Print Interval (1-3600 sec)
Z Same as pressing Zero button
T Same as pressing Tare button
xT Download Tare value in grams (positive values only). Sending 0T clears tare
(if allowed)
PU Print current unit: g, kg, lb, oz, lb:oz
xU Set scale to unit x: 1=g, 2=kg, 3=lb, 4=oz, 5=lb:oz
PV Version: print name, software revision and LFT ON (if LFT is set ON).
Esc R Global reset to reset all menu settings to the original factory defaults
NOTES:
– Commands sent to the Indicator must be terminated with a carriage return (CR) or
carriage return-line feed (CRLF).
– Data output by the Indicator is always terminated with a carriage return-line feed (CRLF).
1.8.3 Output Format
The default serial output format is shown below.
TABLE 1-5. DEFAULT SERIAL OUTPUT FORMAT
Field: Polarity Space Weight Space Unit Stability Legend CR LF
Length: 1 1 7 1 5 1 3 1 1
Definitions:
Polarity, “–” sign if negative, blank if positive.
Weight, up to six numbers and one decimal, right justified, leading zero blanking.
Units, up to five characters.
Stability, “?” character is printed if not stable, blank if stable.
Legend, up to 3 characters: G = gross weight, NET = net weight, T = tare

CHAPTER 1 GETTING STARTED
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1.9 LEGAL FOR TRADE (LFT)
NOTE: When LFT is set to ON through the LFT sub-menu, and the LFT switch on the Main
PCB is set to ON (see Figure 1-1, page 1-4), the following menu settings cannot be changed:
Span Calibration, Linearity Calibration, Calibration Unit, GEO, LFT, Capacity,
Graduation, Zero Range, Stable Range, AZT, Modes, and Units.
To enable editing of these menu settings, open the Indicator and return the LFT switch on the
Main PCB to the OFF position. Then set the LFT menu item to OFF, as follows:
1. Press and hold TARE/Menu until C.A.L. appears, then press No.
2. S.E.t.U.P appears. Press Yes.
3. rESEt appears. Press No.
4. LFt appears. Press Yes.
5. OFF appears. Press Yes.
6. LFt appears again. Press No. Continue to press No until END appears. Press Yes.
(Or simply press Exit after leaving the LFT menu.)
7. The Indicator returns to weighing mode. It is now possible to use the menus mentioned
above.
After the LFT/CAL Lock setting has been turned off, the scale must be inspected in accordance
with local weights and measures regulations before it can be used in LFT mode again.
The weights and measures official may apply a wire or paper security seal as shown below.
Figure 1-9. T32 Wire Seal
Figure 1-10. T32 Paper Seal
Paper
Seal

CHAPTER 2 TROUBLESHOOTING
3000 Series T32ME & MC Indicators Service Manual 2-1 Ohaus Corporation www.ohaus.com
2.1 INTRODUCTION
This section of the manual covers visual inspection of the Indicator, troubleshooting, and Error
Code table, Table 2-1, and a Problem Solver, Table 2-2. For setup and connection to either a
known good base or simulator, see Chapter 1. Follow all directions step by step. Make certain
that the work area is clean and use care when handling components of the Indicator.
2.2 VISUAL INSPECTION
Carefully remove the Indicator from its packing container and remove any packing material
fastened to the unit. Note all items supplied with the unit such as AC power supply, cables,
instruction manual, weights, etc. Keep a record of all items and note their condition.
1. Examine the Indicator for signs of abuse such as a cracked top cover or base, damage
from liquids, cracks on corners, which may suggest the unit was dropped.
2. Open the Indicator by removing the four screws in the rear housing. Be careful not to
stretch the cables that connect the main Printed Circuit Board (PCB) to the outlets
(RS232 and Load Cell ports) and power supply.
3. Examine the top of the main PCB for cracks or signs of corrosion.
4. If it appears that corrosion may have affected the board and you want to examine the
bottom of the PCB, remove the four screws holding it to the housing.
5. Carefully lift out the main PC board. If it is cracked or shows signs of corrosion, it
requires replacement. See Chapter 3, Maintenance Procedures, for board replacement
and testing. If the Indicator shows no sign of physical damage, continue with procedures.
See chart below for visual checking procedures.
Figure 2-1. Visual Checking Procedures.

CHAPTER 2 TROUBLESHOOTING
Ohaus Corporation www.ohaus.com 2-2 3000 Series T32ME & MC Indicators Service Manual
2.3 ERROR CODES
When a problem occurs using the indicator, the display may indicate an error code.
Table 2-1 describes the error codes and specifies the probable cause and remedy.
TABLE 2-1. ERROR CODES
ERROR PROBABLE CAUSE REMEDY
Error 7.0 Unstable weight reading when
defining reference weight. Check platform location.
Test with Strain Gauge Simulator.
Error 8.1 Weight reading exceeds
Power On Zero limit. Remove load from scale.
Recalibrate scale. If error continues,
Test the PCB, replace if necessary.
Error 8.2 Weight reading below
Power On Zero limit. Add load to scale.
Recalibrate. If error continues,
Test the PCB, replace if necessary.
Error 8.3 Weight reading exceeds Overload
limit. Reduce load on scale. If error continues,
Test the PCB, replace if necessary.
Error 8.4 Weight reading below Underload
limit. Recalibrate. If error continues, Test the PCB, replace if necessary.
Error 9.0 Internal fault. Cycle power. If error continues,
Test the PCB, replace if necessary.
Error 9.5 Calibration data not present. Calibrate scale. If error continues,
Test the PCB, replace if necessary.
Error 53 EEPROM data incorrect. Cycle power on and off.
If error continues,
Test the PCB, replace if necessary.
CAL E Calibration Error. Calibration value
outside allowable limits. Repeat calibration using correct calibration weights. If error continues,
Test the PCB, replace if necessary.
LOW rEF In Pieces mode, the average
piece weight of the parts is small
(warning).
You may continue to weigh, but results
may not be accurate, because average
piece weight is smaller than can be
accurately counted.