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CHAPTER 2 TROUBLESHOOTING

2.2.1 Diagnosis

TABLE 2-1. DIAGNOSTIC GUIDE

Symptom Possible

Cause(s) Remedy

Unit will not turn on

Power cord not plugged in or
properly connected.

Power outlet not supplying
electricity.

Battery discharged (T31P only).

Check power cord connections. Make
sure power cord is plugged in properly
into the power outlet.
Check power source.

Reconnect AC power to charge the
battery.

Cannot zero the
Scale, or will not
zero when turned on.

Load on Scale exceeds
allowable limits.
Load on Scale is not stable.
Load Cell is damaged.
PCB is damaged.

Remove load on Scale.

Wait for load to become stable.
Replace Load Cell.
Replace PCB.

Poor accuracy

Improper calibration
Unstable environment

Load Cell is damaged.
PCB is damaged.

Perform calibration.
Move scale to suitable location.

Replace Load Cell.
Replace PCB.

Unable to calibrate

Unstable environment
Incorrect calibration mass

Lock Calibration Menu set to On.
Lock switch on PCB is “on”.

LFT menu set to On.

Move the scale to suitable location.
Use correct calibration mass.

Set Lock Calibration Menu to Off.
Set the Lock switch on PCB to Off.

Set LFT menu to Off.

Battery indicator is
flashing

(T31P only)

Battery discharged

Connect indicator to power and
charge

battery.

Battery fails to
charge fully

(T31P only)

Battery is defective.

Replace battery.

Error 7.0

Unstable weight reading when
defining

reference weight.

Unstable Error, check platform location.

Error 8.1

Weight reading exceeds Power
On Zero limit.

Remove load from scale. Recalibrate
scale.

Error 8.2

Weight reading below Power On
Zero limit.

Add load to scale. Recalibrate scale.

Error 8.3

Weight reading exceeds
Overload limit.

Reduce load on scale.

Error 8.4

Weight reading below Underload
limit.

Add load to scale. Recalibrate scale.

Error 9.0

Internal fault.

Cycle power.
Replace PCB.

3000 Series T31 Indicators Service Manual

2-3

Ohaus Corporation www.ohaus.com

Содержание 3000 Series T31

Страница 1: ...SERVICE MANUAL 3000 Series T31 Indicators T31P T31XW Ohaus Corporation 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 973 377 9000 ...

Страница 2: ......

Страница 3: ...rate 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 ...

Страница 4: ......

Страница 5: ...terface Commands 1 12 1 9 3 Output Format 1 12 1 10 Legal For Trade LFT 1 13 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 Printed Circuit Board PCB Replacement 3 2 3 2 2 Cabl...

Страница 6: ...reasing Decreasing Load Test 4 2 5 1 T31P Indicator Housing Internal Parts 5 3 5 2 T31XW Indicator Housing Internal Parts 5 5 A 1 Setup Calibration Values A 1 B 1 Geographical Adjustment Values B 1 LIST OF ILLUSTRATIONS FIGURE NO TITLE 1 1 Printed Circuit Board PCB T31 Indicator 1 4 1 2 Load Cell wiring 1 4 1 3 Open shorted jumpers 1 4 1 4 Rear panel T31XW 1 5 1 5 RS232 Pins 1 5 1 6 T31 Display 1 ...

Страница 7: ... and adjustments Chapter 5 Drawings and Parts Lists Contains exploded views of T31 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 discharg...

Страница 8: ... Load Cell Simulator optional 3 Computer with RS232 Interface for testing the RS232 communications 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...

Страница 9: ...e 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 8 2 x 2 8 x 6 5 210 x 71 x 168 8 3 x 2 8 x 5 8 212 x 71 x 149 Net Weight lb kg 3 6 1 6 6 6 2 9 ...

Страница 10: ... housing by carefully pulling the top of the front housing forward Below is a diagram of the T31 s Main PCB with connectors jumpers terminals and switches indicated The Load Cell Cable connects to Terminal Block J5 OFF ON J7 J6 J5 W1 W2 J4 Membrane Switch connector T31XW only RS232 Terminal J7 T31XW only Sense Jumper W2 LFT On Off Switch Sense Jumper W1 Load Cell Terminal J5 RS232 Terminal J6 T31P...

Страница 11: ...t to terminal block J7 See Figure 1 1 Re tighten the strain relief to ensure a water tight seal Strain Relief for RS232 cable Figure 1 4 Rear panel T31XW The RS232 wiring on the T31XW s Terminal J7 is labeled J7 1 TXD J7 2 RXD J7 3 GND to facilitate connecting the RS232 cable The RS232 pin configuration for the T31P is illustrated in Figure 1 5 below 1 2 3 4 5 6 7 8 9 Figure 1 5 RS232 Pins Pin Con...

Страница 12: ...ng the charging process The battery is protected against over charging and the Indicator can remain connected to the AC power line Connect AC power to the indicator and allow it to charge While the battery is charging the triangle above the battery function symbol will light When the battery is fully charged this triangle will disappear The indicator can operate up to 100 hours on a fully charged ...

Страница 13: ...er menu 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 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 1 7 1 Power ON To turn the indicator on press ON ZERO...

Страница 14: ...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 T3...

Страница 15: ...oximately five minutes after stabilizing to room temperature 6 To abort calibration press the Exit button anytime during the calibration process 1 8 1 Geographical Adjustment Factor The Geographical Adjustment Factor GEO is used to compensate for variations in gravity Local gravity variance depending on distance from the equator and altitude above sea level is compensated for by entering a Geocode...

Страница 16: ... displays the actual weight value 1 8 3 Linearity Calibration Linearity calibration uses three calibration points the first with no weight on the scale the second at approximately half capacity the third at capacity The Linearity calibration points are fixed and cannot be altered user during the procedure See Appendix A for the linearity points Press and hold TARE Menu until C A L appears then pre...

Страница 17: ...ting 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...

Страница 18: ... 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 9 3 Output Format The default serial output format is sho...

Страница 19: ...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 abovementioned menus After the LFT CAL Lock setting has been turned off the scale must be inspected in...

Страница 20: ...CHAPTER 1 GETTING STARTED Ohaus Corporation www ohaus com 1 14 3000 Series T31 Indicator Service Manual ...

Страница 21: ... 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 hav...

Страница 22: ...ents 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 part NOTE If more than one symptom is observed approach one area at a time and remember that the symptoms may be int...

Страница 23: ...ate Unstable environment Incorrect calibration mass Lock Calibration Menu set to On Lock switch on PCB is on LFT menu set to On Move the scale to suitable location Use correct calibration mass Set Lock Calibration Menu to Off Set the Lock switch on PCB to Off Set LFT menu to Off Battery indicator is flashing T31P only Battery discharged Connect indicator to power and chargebattery Battery fails to...

Страница 24: ...PCB CAL E Calibration Error Calibration value outside allowable limits Repeat calibration using correct calibration weights 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 Ohaus Corporation www ohaus com 2 4 3000 Series T31 Indicators Servic...

Страница 25: ...de using a cloth dampened with a mild detergent 3 For the T31XW use approved cleaning solutions for the stainless steel Indicator housing and rinse with water CAUTION DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE S FINISH 4 Check the Power Cord for broken or damaged insulation 5 Make a visual inspection for faulty connectors wiring and loo...

Страница 26: ...nal Block J7 See Figure 1 1 5 On the T31P Disconnect the battery Pull the horizontal white tab plug connecting the RS232 Interface to the PCB s Terminal J6 See Figure 1 1 6 On both models Pull the white tab wire plugs connecting the PCB to the unit s power supply Disconnect the wire leads connecting the scale s load cell to the PCB s Load Cell Terminal Block J5 See Figure 1 1 7 Remove the four scr...

Страница 27: ...ousing and disconnect the plastic ribbon cable that connects the Membrane Switch to the PCB 2 Carefully remove the old Function Label or Membrane Switch It is held in place with a strong adhesive 3 Clean the Top Cover and remove all traces of adhesive 4 Remove the protective backing from the back of the new Function Label or Membrane Switch Carefully position it on the Top Housing starting at the ...

Страница 28: ...ly s base 15 Lift out the Power Supply 16 Position the replacement Power Supply with the screw holes aligned 17 Position the grounding wire over the screw hold on the right side insert the screw and tighten it 18 Attach the white tab plug that connects the Power Supply to the PCB 19 Carefully position the Power Supply Cover with the wires from the smaller white tab plug coming through the gap in t...

Страница 29: ...racket that holds the Battery in place 7 Position the replacement Battery in the place of the old one 8 Reposition the bracket that holds the Battery in place and insert the four screws each with a washer that secure the Battery to the Bottom Housing 9 Insert the quick connect tabs as they were before 10 Reassemble the Top Housing and Bottom Housing and reconnect the Load Cell Cable to the Load Ce...

Страница 30: ...CHAPTER 3 MAINTENANCE PROCEDURES Ohaus Corporation www ohaus com 3 6 3000 Series T31 Indicators Service Manual ...

Страница 31: ...ct it to the Indicator power plug For the T31XW check that the power cord is not damaged 2 Plug the AC Adapter or power cord into a suitable power source 3 With the Indicator connected to an appropriate power supply press the ON ZERO Off button The Indicator performs a self test indicates the software revision and then goes into weighing mode 4 If all of the displays appear normal in this test con...

Страница 32: ...on the Indicator Perform a Span Calibration with zero at the simulator s zero setting and 100 capacity at the simulator s 2 0 milli volt setting 2 Following calibration check that the Indicator s display reading is stable at each simulator level up to the maximum set in the calibration If the readings are stable the Indicator is functioning properly 4 5 Calibration Retention Test This test checks ...

Страница 33: ...ghly checked after the replacement is made The balance MUST meet the parameters of all applicable specifications in this manual If further technical information is needed please contact your local Ohaus distributor or Ohaus Corporation www ohaus com 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 USA Tel 973 377 9000 Fax 973 593 0359 In the United States call toll free 800 526 0659 between 8...

Страница 34: ...PARTS LISTS DIAGRAMS 5 1 3000 SERIES T31P INDICATOR HOUSING INTERNAL PARTS Figure 5 1 Series 3000 T31P Indicator Housing Internal Parts Ohaus Corporation www ohaus com 5 2 3000 Series T31 Indicator Service Manual ...

Страница 35: ...dability Label 2 Function Label 3 Top Housing 5 LCD Display with backlight 7 Main PCB 8 Battery Bracket Kit 9 Rechargeable Lead Acid Battery 10 Bottom Housing 11 Knobs Set of 2 12 Wall Mount Kit 13 Rubber Feet Set of 4 14 Cable Kit 18 Cable Fitting 19 Internal Cable Mounts 20 Hardware Kit 80 Adapter 3000 Series T31 Indicator Service Manual 5 3 Ohaus Corporation www ohaus com ...

Страница 36: ...ARTS LISTS DIAGRAMS 5 2 3000 SERIES T31XW INDICATOR HOUSING INTERNAL PARTS Figure 5 1 Series 3000 T31XW Indicator Housing Internal Parts Ohaus Corporation www ohaus com 5 4 3000 Series T31 Indicator Service Manual ...

Страница 37: ... with Gasket 5 LCD Display with backlight 7 Main PCB 10 Bottom Housing 11 Knobs with seals Set of 2 12 Wall Mount Kit 14 Cable Kit 15 Power Supply PCB 16 Power Supply Cover 17 Cable Fitting for AC Power Cord 18 Cable Fittings for RS232 and Load Cell cables 19 Internal Cable Mounts 20 Hardware Kit 21 I O Filler Plugs for Cable Fittings 70 Line Cord 3000 Series T31 Indicator Service Manual 5 5 Ohaus...

Страница 38: ...CHAPTER 5 PARTS LISTS DIAGRAMS Ohaus Corporation www ohaus com 5 6 3000 Series T31 Indicator Service Manual ...

Страница 39: ...0 75 100 120 150 75 150 200 0 01 0 02 0 05 0 1 0 2 0 05 0 1 0 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 100 200 250 0 05 0 1 0 2 0 05 0 1 0 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 250 120 250 300 0 02 0 05 0 1 0 2 0 05 0 1 0 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 250 300 150 300 400 0 02 0 05 0 1 0 2 0 1 0 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 250 300 400 200 400 500 0...

Страница 40: ... 6000 2500 5000 7500 0 5 1 2 5 2 5 5 10 15 20 25 30 40 50 60 75 100 120 150 200 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 5000 6000 7500 3000 7500 10000 0 5 1 2 5 10 2 5 10 5 10 15 20 25 30 40 50 60 75 100 120 150 200 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 5000 6000 7500 10000 5000 10000 12000 1 2 5 10 20 2 5 10 5 10 15 20 25 30 40 50 60 75 100 120 150 200 250 300 400 50...

Страница 41: ... 17 17 18 18 19 19 20 20 21 21 22 22 04 05 05 06 06 07 07 08 08 09 09 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 04 04 05 05 06 06 07 07 08 08 09 09 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 03 04 04 05 05 06 06 07 07 08 08 09 09 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 03 03 04 04 05 05 06 06 07 07 08 08 09 ...

Страница 42: ...4 66 24 67 57 67 57 69 35 69 35 71 21 71 21 73 16 73 16 75 24 75 24 77 52 77 52 80 56 80 56 85 45 85 45 90 00 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 20 21 21 22 22 23 23 24 24 25 25 26...

Страница 43: ......

Страница 44: ... 80252598 P N 80252598 SERVICE MANUAL 3000 SERIES T31 INDICATORS ...

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