OHAUS T51P Service Manual
5000 series t51 indicators
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- Instruction manual (64 pages) ,
- User manual (61 pages) ,
- Quick start manual (4 pages)
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Summary of Contents for OHAUS T51P
- Page 1 SERVICE MANUAL 5000 Series T51 Indicators T51P T51XW Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000...
- Page 3 5000 Series T51 Indicators: T51P & T51XW 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
Membrane Replacement ..................3-4 CHAPTER 4 TESTING 4.1. Testing ........................4-1 Power Test.........................4-1 Performance Tests Using a Scale Base ..............4-1 4.3.1 Increasing/Decreasing Load Test...............4-2 4.3.2 Overload/Underload Test ...................4-2 Performance Tests Using a Load Cell Simulator............4-3 Ohaus Corporation www.ohaus.com 5000 Series T51 Indicators Service Manual... - Page 6 Calibration Retention Test ..................4-3 RS232 Interface Test....................4.3 Print Test ........................4-3 CHAPTER 5 PARTS LISTS & DIAGRAMS 5000 Series T51P Indicator: Housing & Internal Parts ..........5-2 5000 Series T51XW 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 T51 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
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. - Page 9 4 hex-head bolts RS485/422 RS232, Relay Option Cable Load Cell Scale 1 Scale 2 Cables RS232 Cable Security screw location Power Cord Figure 1-2. Top and Bottom Housing, and Rear Panel, T51XW. 5000 Series T51 Indicator Service Manual Ohaus Corporation www.ohaus.com...
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Page 10: Specifications
Operating Temperature Range –10°C to 40°C / /14°F to 104°F AC Power 100-240 VAC / 50-60 Hz, Internal Universal Power Supply 6 C-type (LR14) disposable Batteries (T51P), Battery Power optional 7.2v rechargeable NiMH Battery Pack Ohaus Corporation www.ohaus.com 5000 Series T51 Indicator Service Manual... -
Page 11: Hardware Setup Or Disassembly
CHAPTER 1 HARDWARE SETUP OR DISASSEMBLY Both the T51P and T51XW connect to a base scale through a Load Cell Cable that connects to the Indicator’s Main Printed Circuit Board (PCB). Each model has a mounting bracket that can be attached to a column mount bracket or a wall mount. To remove the mounting bracket, remove the threaded knobs, holding the Indicator by hand. -
Page 12: Rs232 Interface
CHAPTER 1 1.6.2 RS232 Interface The T51P and T51XW have a built-in RS232 Interface. The T51P has a standard 9-pin D-style female connector on the back of the T51P Housing. (See Table 1-2 for Pin Configuration.) The T51XW has terminals for connecting a cable directly to the main PCB. (See Figure 1-1, Terminal J7, and Table 1-3 for Pin Configuration). -
Page 13: Operation
Both models have an Internal Universal Power Supply, 100-240 VAC / 50-60 Hz, and plug into a standard, properly grounded electrical outlet. The T51P indicator can also be operated on six alkaline 0 % - 5 % charged batteries (not supplied) when AC power is not available. -
Page 14: Overview Of The Control Functions
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. Ohaus Corporation www.ohaus.com 5000 Series T51 Indicator Service Manual... -
Page 15: T51 Menu Structure
-NAME LAYOUT -FORMAT -FEED LIST END PRINT2 Notes: Hidden when LEGAL FOR TRADE is ON. Locked at current setting when LEGAL FOR TRADE is ON. Visible only with RS422/485 option installed. 5000 Series T51 Indicator Service Manual Ohaus Corporation www.ohaus.com... -
Page 16: Calibration
The display shows --C-- while the zero point is established. When zero calibration is completed, the display shows dONE. Then the scale exits to the active weighing mode and displays the actual weight value. Ohaus Corporation www.ohaus.com 1-10 5000 Series T51 Indicator Service Manual... -
Page 17: Span Calibration
The display shows --C-- while the zero point is established. When span calibration is completed, the display shows dONE. The scale exits to the active weighing mode and displays the actual weight value. 5000 Series T51 Indicator Service Manual 1-11 Ohaus Corporation www.ohaus.com... -
Page 18: Linearity Calibration
The display shows --C-- while the zero point is established. When linearity calibration is completed, the display shows dONE. The scale exits to the active weighing mode and displays the actual weight value. Ohaus Corporation www.ohaus.com 1-12 5000 Series T51 Indicator Service Manual... -
Page 19: Calibration Test
GEO appears again. Press No to exit the GEO menu. End appears. Press Yes to return to the CAL menu. Press No continuously until E.n.d appears. Press Yes to return to weighing mode. 5000 Series T51 Indicator Service Manual 1-13 Ohaus Corporation www.ohaus.com... -
Page 20: Rs232 Interface Connection
Otherwise, press No. Then press Yes when End.C1 appears. At this point, if a second communication interface is present, the COM2 menu is available. Otherwise, press Exit to return to weighing mode. Ohaus Corporation www.ohaus.com 1-14 5000 Series T51 Indicator Service Manual... -
Page 21: Interface Commands
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. 5000 Series T51 Indicator Service Manual 1-15 Ohaus Corporation www.ohaus.com... -
Page 22: Legal For Trade (Lft)
The weights and measures official may apply a wire or paper security seal as shown below. Figure 1-11. T51P Wire Seal. Figure 1-12. T51P Paper Seal. Figure 1-14. T51XW Paper Seal Figure 1-13. -
Page 23: Chapter 2 Troubleshooting
Remove the four screws holding it to the housing. Also remove the RS232 port, which is on the bottom of the PCB (on the T51P). 5. Carefully lift out the main PC board. If it is cracked or shows signs of corrosion, it requires replacement. -
Page 24: 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 25: Diagnostic Guide
Off position. (See Figure 1-3.) Indicator does not Real time clock battery failed. Replace real time clock battery on PCB show correct time. (See Figure 1-3), or replace PCB. 5000 Series T51 Indicators Service Manual Ohaus Corporation www.ohaus.com... - Page 26 REF WT Err Reference weight too small. Increase sample size. The weight on the platform is too small to define a valid reference weight. Ohaus Corporation www.ohaus.com 5000 Series T51 Indicators Service Manual...
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Page 27: Chapter 3 Maintenance Procedures
The Indicator should be inspected and checked regularly, as follows: 1. Unplug the AC Adapter before cleaning. 2. For the T51P, clean the outside using a cloth dampened with a mild detergent. 3. For the T51XW, use appropriate cleaning solutions for the stainless-steel Indicator housing and rinse with water. -
Page 28: Main Printed Circuit Board (Pcb) Replacement
5. If cable-leads are connected to Alternate Load Cell Connector J4 (see Figure 1-3), loosen terminal block’s set-screws and remove the leads. 6. On the T51P, 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 29: Display Printed Circuit Board (Pcb) Replacement
Repairs are not recommended on the Display PCB. Component parts of the Display PCB are not stocked by Ohaus. Replacement is recommended rather than repairing. 1. Separate the Top and Bottom Housing. (Follow steps 1 – 3 in Section 3.2.1.) 2. -
Page 30: Membrane Replacement
Membrane Switch into position. 6. Reconnect the cable removed in Step 2. 7. Close the Housing and re-insert the four screws. 8. Perform calibration procedures. (See Section 1.9.) Perform testing procedures. (See Chapter 4.) Ohaus Corporation www.ohaus.com 5000 Series T51 Indicators Service Manual... -
Page 31: 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. 5000 Series T51 Indicators Service Manual Ohaus Corporation www.ohaus.com... -
Page 32: 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 5000 Series T51 Indicators Service Manual... -
Page 33: 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 34 CHAPTER 5 PARTS LISTS & DIAGRAMS 5000 SERIES T51P INDICATOR: HOUSING & INTERNAL PARTS Figure 5-1. Series 5000 T51P Indicator: Housing & Internal Parts. Ohaus Corporation www.ohaus.com 5000 Series T51 Indicators Service Manual...
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Page 35: 5000 Series T51P Indicator: Housing & Internal Parts
CHAPTER 5 PARTS LISTS & DIAGRAMS 5000 SERIES T51P INDICATOR: HOUSING & INTERNAL PARTS TABLE 5-1. T51P INDICATOR: HOUSING & INTERNAL PARTS Drawing Item Description Capacity Label Kit Membrane Switch Front Housing Feet, Set of 4, Display LCD Hole Plugs... - Page 36 CHAPTER 5 PARTS LISTS & DIAGRAMS 5000 SERIES T51XW INDICATOR: HOUSING & INTERNAL PARTS Figure 5-1. Series 5000 T51XW Indicator: Housing & Internal Parts. Ohaus Corporation www.ohaus.com 5000 Series T51 Indicators Service Manual...
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Page 37: 5000 Series T51Xw 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, Relay Kit Main PCB Line Cord 5000 Series T51 Indicators Service Manual Ohaus Corporation www.ohaus.com... - Page 38 CHAPTER 5 PARTS LISTS & DIAGRAMS Ohaus Corporation www.ohaus.com 5000 Series T51 Indicators Service Manual...
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Page 39: 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′ 5000 Series T51 Indicators Service Manual Ohaus Corporation www.ohaus.com... - Page 40 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 5000 Series T51 Indicators Service Manual...
- Page 42 *80252587* P/N 80252587 SERVICE MANUAL: 5000 SERIES T51 INDICATORS...
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