OHAUS SD Series Service Manual
Sd series scales
Hide thumbs
Also See for SD Series:
- User manual (72 pages) ,
- Instruction manual (68 pages) ,
- Manual (73 pages)
Related Manuals for OHAUS SD Series
Summary of Contents for OHAUS SD Series
- Page 1 SERVICE MANUAL SD Series Scales Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000...
- Page 3 SERVICE MANUAL SD Series 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.
-
Page 5: Table Of Contents
Performance Tests Using a Load Cell Simulator............4-3 Calibration Retention Test ..................4-3 Repeatability Test ......................4-3 Off-Center Load Test ....................4-5 Linearity Test ......................4-6 CHAPTER 5 PARTS LISTS & DIAGRAMS SD Series Scale: Small Model...................5-3 SD Series Scale: Large Model...................5-5 Ohaus Corporation www.ohaus.com SD Series Scales Service Manual... - Page 6 Load Cell Output Readings (in mV with 3V Excitation) .........2-5 Load Cell Resistance Readings (in Ohms) ............2-5 Repeatability Worksheet ..................4-4 Linearity Test Masses ...................4-7 SD Series Scale: Small Model ................5-3 SD Series Scale: Large Model ................5-5 LIST OF ILLUSTRATIONS FIGURE NO.
-
Page 7: Chapter 1 Getting Started
INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus SD Series Scales. The contents of this manual are contained in five chapters: Chapter 1 Getting Started – Contains information regarding service facilities, tools and test equipment, measuring masses, specifications, and the mechanical and electronic functions of the scale. -
Page 8: Tools And Test Equipment Required
Static over load limit (load cell) 150% capacity Power AC Adapter 9V DC / 100mA 3 “C” alkaline batteries (not included) Battery Operating Time 360 hours Auto-Shutoff 4 minutes with no activity (battery operation only) Ohaus Corporation www.ohaus.com SD Series Scales Service Manual... -
Page 9: Operation
GETTING STARTED CHAPTER 1 OPERATION This section contains information on the basic operation of the SD Series Scale. Exploded view drawings in Chapter 5 identify all components. 1.5.1 Power Supply Power to the scale is supplied by a 9 V dc, 100mA Power Adapter, or by 3 “C” size (LR 14) alkaline batteries. -
Page 10: Basic Functions
6. The display will hold until a button is pressed. 7. To repeat the process, press UNITS Cal with a mass on the platform or container. 8. To exit, remove the mass from the platform or container and press UNITS Cal. Ohaus Corporation www.ohaus.com SD Series Scales Service Manual... -
Page 11: Calibration
If later recalibration is required, the housing will need to be reopened and the lock switch returned to the original position. Note: When the lock switch is set to the CAL LOCK position, the power-on zero range is reduced to 10% of full capacity. SD Series Scales Service Manual Ohaus Corporation www.ohaus.com... - Page 12 GETTING STARTED CHAPTER 1 Ohaus Corporation www.ohaus.com SD Series Scales Service Manual...
-
Page 13: Chapter 2 Troubleshooting
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. 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. SD Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 14: 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 15: Diagnostic Guide Table
Replace PCB. Display = Lo bat Low battery shutdown Replace batteries. Display = Lo Line Low line voltage shutdown If input voltage is unstable, switch to Display = (power adapter problem) battery operation. SD Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 16: Checking The Load Cell's Signal
The EXE+ and EXE– wires should be connected to the PCB, and the SIG+ and SIG– wires must be disconnected. Record the colors for each wire connection before disconnecting. (See Table 2-2 for typical color code for SD Series.) TABLE 2-2. COLOR CODE FOR LOAD CELL WIRING*... -
Page 17: Resistance Test
Ex+ to Ex– S+ to S– Ex+ to S– Ex+ to S+ Ex– to S+ Ex– to S– 264 ± 10 249 ± 10 187 ± 10 187 ± 10 200 ± 10 232 ± 10 All models SD Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 18: Testing The Printed Circuit Board (Pcb)
(See Table 2.3 for values to use.) If the resulting readings are unstable, the Main PC Board is defective. Use the Simulator to calibrate the scale in the next procedure. Ohaus Corporation www.ohaus.com SD Series Scales Service Manual... - Page 19 PCB is functional. If the scale readings vary, or do not agree with readings in Table 2-3, the Main PC Board is defective and should be replaced. (See Chapter 3.) SD Series Scales Service Manual Ohaus Corporation www.ohaus.com...
- Page 20 CHAPTER 2 TROUBLESHOOTING Ohaus Corporation www.ohaus.com SD Series Scales Service Manual...
-
Page 21: Chapter 3 Maintenance Procedures
If, after the replacement of any component, the unit is still non functional and no other information on the subject is available in the manual, contact your local Ohaus office or contact Ohaus Corporation by visiting www.ohaus.com. In the United States call Ohaus Aftermarket toll free, 800-526-0659 between 8:00 a.m. - Page 22 CHAPTER 3 MAINTENANCE PROCEDURES 3.2.1 Printed Circuit Board (PCB) Replacement Repairs are not recommended on the Indicator. Component parts of the Indicator are not stocked by Ohaus. Replacement is recommended rather than repairing. Replace the Indicator for any of the following reasons: –...
-
Page 23: Battery Replacement
4. Remove the protective backing from the back of the new Function Label, and carefully position it on the Top Housing, starting at the bottom of the Housing. Use a rolling motion to smooth the Function Label into position. SD Series Scales Service Manual Ohaus Corporation www.ohaus.com... - Page 24 CHAPTER 3 MAINTENANCE PROCEDURES Ohaus Corporation www.ohaus.com SD Series Scales Service Manual...
-
Page 25: Chapter 4 Testing
These tests are performed on the Indicator using a known good scale base and test mass. 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. SD Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 26: Overload/Underload Test
1. Turn the Indicator OFF and disconnect the AC Adapter. 2. Wait one minute, then reconnect the AC Adapter to the Indicator. 3. Check to insure that the Indicator retained calibration settings. Ohaus Corporation www.ohaus.com SD Series Scales Service Manual... -
Page 27: Repeatability Test
3. Remove the mass from the platform. 4. Repeat this test starting at Step 1 until you record a total of ten readings Fill in the worksheet (Table 4-1) with the ten readings. SD Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 28: Repeatability Worksheet
Note: If the scale does not meet specifications, move it to a suitable location, ensure that it is level, and try again. If it still does not meet specifications, replace the base. Ohaus Corporation www.ohaus.com SD Series Scales Service Manual... -
Page 29: Off-Center Load Test
4. Repeat the test for the back, left, and right position of the Pan. 5. Maximum allowable change in displayed weight readings for each of the four positions can be found in Table 1-1 (Specifications, page 1-2). If this maximum is exceeded, replace the base. SD Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 30: Linearity Test
8. The difference in the weights of the test mass should be within the tolerance in the relevant Specification Table in Chapter 1. If not, calibrate (see Section 1.8) and repeat the test. 9. If the Scale remains out of tolerance, the base may need to be replaced. Ohaus Corporation www.ohaus.com SD Series Scales Service Manual... -
Page 31: Chapter 5 Parts Lists & Diagrams
CHAPTER 5 PARTS LISTS & DIAGRAMS This section of the manual contains exploded views for the SD Series Scales. The exploded view drawings are designed to identify the parts which can be serviced on the balance in the field. NOTE: In all cases where a part is replaced, the balance must be thoroughly checked after the replacement is made. -
Page 32: Sd Series Scale: Small Model
CHAPTER 5 PARTS LISTS & DIAGRAMS SD SERIES SCALE: SMALL MODELS Figure 5-1. SD Series Scale: Small Models’ Parts. Ohaus Corporation www.ohaus.com SD Series Scales Service Manual... - Page 33 CHAPTER 5 PARTS LISTS & DIAGRAMS SD SERIES SCALES: SMALL MODELS TABLE 5-1. SD SERIES SCALES: SMALL MODELS PARTS Drawing Item Description Base & Cable Connector Rubber Feet (4) Function Label LCD Display Battery Cover Indicator (Complete) Mounting Bracket Adapter Interchangeable Plug Set (UK, EU, US, AU) Interchangeable Plug Set (UK &...
-
Page 34: Sd Series Scale: Large Model
CHAPTER 5 PARTS LISTS & DIAGRAMS SD SERIES SCALES: LARGE MODELS Figure 5-2. SD Series Scale: Large Models’ Parts. Ohaus Corporation www.ohaus.com SD Series Scales Service Manual... - Page 35 CHAPTER 5 PARTS LISTS & DIAGRAMS SD SERIES SCALES: LARGE MODELS TABLE 5-2. SD SERIES SCALES: LARGE MODELS PARTS Drawing Item Description Base, Feet & Cable Connector Base & Connector (without feet) Adjustable Feet (4) Function Label LCD Display Battery Cover...
- Page 37 *80120061* P/N 80120061 SERVICE MANUAL: SD SERIES BASE & INDICATOR...
Need help?
Do you have a question about the SD Series and is the answer not in the manual?
Questions and answers