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Summary of Contents for OHAUS T71P
- Page 1 SERVICE MANUAL 7000 Series T71 Indicators T71P T71XW Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000...
- Page 3 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.
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Page 5: Table Of Contents
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 T71P and T71XW: Top and Bottom Housing ............1-2 Specifications......................1-4 Hardware Setup or Disassembly ................1-5 1.6.1 Connecting the Scale Base’s Load Cell .............1-5 1.6.2... - Page 6 Calibration Retention Test ..................4-3 RS232 Interface Test....................4.3 Print Test ........................4-3 CHAPTER 5 PARTS LISTS & DIAGRAMS 7000 Series T71P Indicator: Housing & Internal Parts ..........5-2 7000 Series T71XW Indicator: Housing & Internal Parts...........5-4 APPENDIX A SETUP & CALIBRATION VALUES Appendix A.
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Page 7: Chapter 1 Getting Started
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. -
Page 8: Tools And Test Equipment Required
Connector Power Receptacle Scale 1 Load Cell Cable Gland Load Cell Connector for Scale 1 Scale 2 Load Cell Cable Gland Figure 1-1. Top and Bottom Housing, and Rear Panel, T71P. Ohaus Corporation www.ohaus.com 7000 Series T71 Indicator Service Manual... -
Page 9: Top And Bottom Housing, And Rear Panel, T71Xw
4 hex-head bolts RS485/422 RS232, Relay Option Cable Load Cell Scale 1 Scale 2 Cables RS232 Cable Security screw Power Cord Figure 1-2. Top and Bottom Housing, and Rear Panel, T71XW. 7000 Series T71 Indicator Service Manual Ohaus Corporation www.ohaus.com... -
Page 10: Specifications
Main Power 100-240 VAC / 50-60 Hz, Internal Universal Power Supply 6 C-type (LR14) Batteries Rechargeable battery pack Battery Power Rechargeable battery pack (option) (option) RS232 or RS422/485. Can be either Ohaus Corporation www.ohaus.com 7000 Series T71 Indicator Service Manual... -
Page 11: Hardware Setup Or Disassembly
GETTING STARTED CHAPTER 1 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. -
Page 12: Jumper Connections
Figure 1-5. Load Cell wiring. 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. -
Page 13: Operation
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. -
Page 14: Overview Of The Control Functions
Accepts the Advances to the Moves back Exits the library. (Short current setting. next library or to previous library Press) setting. or setting. Increments the Decrements the displayed value. displayed value. Ohaus Corporation www.ohaus.com 7000 Series T71 Indicator Service Manual... -
Page 15: Functions Of Display Keypad
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. 7000 Series T71 Indicator Service Manual Ohaus Corporation www.ohaus.com... -
Page 16: Menu Setup
RETAIN ZERO (2) Locked at current setting when LFT is ON. (3) Hidden when Dual Scale is OFF. BEEPER VOLUME ACCEPT BEEPER UNDER SIGNAL OVER UND-OVR BEEP LIBRARY ALIBI SETUP Ohaus Corporation www.ohaus.com 1-10 7000 Series T71 Indicator Service Manual... - Page 17 Form Feed LOCK MENU LIST LIST Notes: PRNT-1 PRNT-2 (1) Hidden when LFT is ON. (2) Locked at current setting when LFT is ON. (3) Hidden when Dual Scale is OFF. 7000 Series T71 Indicator Service Manual 1-11 Ohaus Corporation www.ohaus.com...
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Page 18: Language Menu Setup
Menu mMENU mMENU mMENU mMENU CALIBRATION READOUT SETUP MODE rEAd rEAd SEtUP STABLE RANGE LANGUAGE DUAL SCALE ZERO LANG LANG ENGLISH ESPANOL Exit 0.000 Figure 1-11. Changing the menu language. Ohaus Corporation www.ohaus.com 1-12 7000 Series T71 Indicator Service Manual... -
Page 19: Calibration
With no load on the scale, press Yes to set the new zero point. ZErO The display shows ZERO --C--, then ZERO DONE and returns to the ZErO current application mode. --C-- ZErO DONE 0.000 7000 Series T71 Indicator Service Manual 1-13 Ohaus Corporation www.ohaus.com... -
Page 20: Span Calibration
SPAN 0 appears. With no load on the scale, press Yes. SPAN The display shows SPAN --C--, followed by SPAN DONE, and returns to SPAN the current application mode. --C-- SPAN DONE 0.000 Ohaus Corporation www.ohaus.com 1-14 7000 Series T71 Indicator Service Manual... -
Page 21: 3-Point Linearity Calibration
Yes. The display shows --C--, followed by the zero calibration point. --C-- 3LIN With no load on the scale, press Yes. The display shows --C--, then 3LIN DONE, and returns to the current application mode. --C-- 3LIN DONE 0.000 7000 Series T71 Indicator Service Manual 1-15 Ohaus Corporation www.ohaus.com... -
Page 22: 5-Point Linearity Calibration
Yes. The display shows --C--, followed by the zero calibration point. --C-- 5LIN With no load on the scale, press Yes. The display shows --C--, then 5LIN DONE, and returns to the current application mode. --C-- 5LIN DONE 0.000 Ohaus Corporation www.ohaus.com 1-16 7000 Series T71 Indicator Service Manual... -
Page 23: Calibration Test
Then press Yes. Settings from 1 to 31 are available. CAL GEO appears again. Press No to exit the GEO menu. Then press Exit to return to the current application mode. 7000 Series T71 Indicator Service Manual 1-17 Ohaus Corporation www.ohaus.com... -
Page 24: Rs232 Interface Connection
Otherwise, press No. Then press Yes when COM 1 END COM1 appears. At this point, if a second communication interface is present, the COM2 menu is available. Otherwise, press Exit to return to current application mode. Ohaus Corporation www.ohaus.com 1-18 7000 Series T71 Indicator Service Manual... -
Page 25: Interface Commands
1. Commands sent to the Indicator must be terminated with a carriage return (CR) or carriage return-line feed (CRLF). 2. Alternate command characters may be defined by the user. 3. Data output by the Indicator is always terminated with a carriage return-line feed (CRLF). 7000 Series T71 Indicator Service Manual 1-19 Ohaus Corporation www.ohaus.com... -
Page 26: Output Format
GROSS INDICATOR menu setting. 7. The Termination Characters field contains CRLF, Four CRLF or Form Feed (ASCII 12), depending on the LINE FEED menu setting. For more information, see the Instruction Manual. Ohaus Corporation www.ohaus.com 1-20 7000 Series T71 Indicator Service Manual... -
Page 27: Legal For Trade (Lft)
The weights and measures official may apply a wire or paper security seal as shown below. Figure 1-13. T71P Paper Seal. Figure 1-12. T71P Wire Seal. Figure 1-15. T71XW Paper Seal Figure 1-14. - Page 28 GETTING STARTED CHAPTER 1 Ohaus Corporation www.ohaus.com 1-22 7000 Series T71 Indicator Service Manual...
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Page 29: Chapter 2 Troubleshooting
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. 7000 Series T71 Indicators Service Manual Ohaus Corporation www.ohaus.com... -
Page 30: Diagnostic Guide
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. Ohaus Corporation www.ohaus.com... -
Page 31: Diagnostic Guide
Lockout Switch on the circuit board may need to be set to the Off position. (See Figure 1-1.) Does not retain Real time clock battery failure Replace real time clock battery. correct time (See Figure 1-3.) 7000 Series T71 Indicators Service Manual Ohaus Corporation www.ohaus.com... - Page 32 If this message persists, it usually tare setting, zero setting, printing indicates the reading is not stable. Correct the instability. --NO—displayed The action is not allowed. Do not attempt this operation. Ohaus Corporation www.ohaus.com 7000 Series T71 Indicators Service Manual...
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Page 33: Chapter 3 Maintenance Procedures
The Indicator should be inspected and checked regularly, as follows: 1. Unplug the AC Adapter before cleaning. 2. For the T71P, clean the outside using a cloth dampened with a mild detergent. 3. For the T71XW, use appropriate cleaning solutions for the stainless-steel Indicator housing and rinse with water. -
Page 34: Main Printed Circuit Board (Pcb) Replacement
5. If cable-leads are connected to the Scale 2 Load Cell Connector J7 (see Figure 1-1), loosen the terminal block’s set-screws and remove the leads. 6. On the T71P, remove the hex screws connecting the RS232 Interface port to the Bottom Housing, so the port will clear when the PCB is lifted out. -
Page 35: Display Printed Circuit Board (Pcb) Replacement
Re-insert and tighten the screws. 8. Reconnect the cables removed in Steps 4 and 5 of Section 3.2.1. 9. On the T71P, re-insert the hex screws connecting the RS232 Interface port to the Bottom Housing. 10. Close the Housing and re-insert the four screws. -
Page 36: Membrane Switch Replacement
Re-insert and tighten the screws. 5. Reconnect the cables removed in Steps 4 and 5 of Section 3.2.1. 6. On the T71P, re-insert the hex screws connecting the RS232 Interface port to the Bottom Housing. 7. Close the Housing and re-insert the four screws. -
Page 37: Chapter 4 Testing
At this point, the Indicator has been checked for full display, menu setup and calibrated. If a Load Cell Simulator is being used, proceed to paragraph 4.4. Select the maximum possible resolution (<1:20,000) to obtain the most accurate test results. 7000 Series T71 Indicators Service Manual Ohaus Corporation www.ohaus.com... -
Page 38: Overload/Underload Test
Once the communications parameters match between the Indicator and either a computer or printer, it is possible to test the Indicator’s print function. Press the Print/Units button. Printing to an external printer or computer should occur – each time the button is pressed. Ohaus Corporation www.ohaus.com 7000 Series T71 Indicators Service Manual... -
Page 39: Chapter 5 Parts Lists & Diagrams
In all cases where a part is replaced, the balance must be thoroughly 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. - Page 40 CHAPTER 5 PARTS LISTS & DIAGRAMS 7000 SERIES T71P INDICATOR: HOUSING & INTERNAL PARTS Figure 5-1. Series 7000 T71P Indicator: Housing & Internal Parts. Ohaus Corporation www.ohaus.com 7000 Series T71 Indicators Service Manual...
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Page 41: 7000 Series T71P Indicator: Housing & Internal Parts
CHAPTER 5 PARTS LISTS & DIAGRAMS 7000 SERIES T71P INDICATOR: HOUSING & INTERNAL PARTS TABLE 5-1. T71P INDICATOR: HOUSING & INTERNAL PARTS Drawing Item Description Capacity Label Kit Membrane Switch Front Housing Feet, Set of 4, Display LCD Hole Plugs... - Page 42 CHAPTER 5 PARTS LISTS & DIAGRAMS 7000 SERIES T71XW INDICATOR: HOUSING & INTERNAL PARTS Figure 5-1. Series 7000 T71XW Indicator: Housing & Internal Parts. Ohaus Corporation www.ohaus.com 7000 Series T71 Indicators Service Manual...
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Page 43: 7000 Series T71Xw Indicator: Housing & Internal Parts
I/O Fitting I/O Fitting Cable Mounts, Internal Hardware Kit I/O Fitting Recharge PCB Accessory, RS422/485 Interface Kit Accessory, RS232 Interface Kit Cover, Relay PCB Accessory, AC Relay Kit Main PCB Line Cord 7000 Series T71 Indicators Service Manual Ohaus Corporation www.ohaus.com... - Page 44 CHAPTER 5 PARTS LISTS & DIAGRAMS Ohaus Corporation www.ohaus.com 7000 Series T71 Indicators Service Manual...
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Page 45: Appendix A Geographical Adjustment Values
43°26′ - 44°32′ 44°32′ - 45°38′ 45°38′ - 46°45′ 46°45′ - 47°51′ 47°51′ - 48°58′ 48°58′ - 50°06′ 50°06′ - 51°13′ 51°13′ - 52°22′ 52°22′ - 53°31′ 53°31′ - 54°41′ 54°41′ - 55°52′ 7000 Series T71 Indicators Service Manual Ohaus Corporation www.ohaus.com... - Page 46 63°30′ - 64°55′ 64°55′ - 66°24′ 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′ Ohaus Corporation www.ohaus.com 7000 Series T71 Indicators Service Manual...
- Page 48 *80252588* P/N 80252588 SERVICE MANUAL: 7000 SERIES T71 INDICATORS...
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