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CHAPTER 4 PARTS LISTS & DIAGRAMS 

Ohaus Corporation  www.ohaus.com 

4-2 

Starter Series Portable Series Service Manual 

4.1  ST300, ST300C and ST300D Portable Meter: PARTS 

 

Figure 4-1.  ST300, ST300C and ST300D: Parts. 

TABLE 4-1 ST300, ST300C and ST300D Meter: PARTS 

Drawing Item  Description 

1

 

SP Housing STARTER 300x 

2

 

SP Overlay ST300x EN 

3

 

SP Overlay ST300x ZH 

4

 

SP PCBA ST300x EN 

5

 

SP PCBA ST300x ZH 

6

 

SP Cover Battery 

 

Note

:  For parts numbers, see your local Ohaus distributor, or visit www.ohaus.com. 

 

 
 
 

Summary of Contents for ST300

Page 1: ...SERVICE MANUAL STARTER Portable Meter ST300 ST300C ST300D ST400D Ohaus Corporation 7 Campus Drive Suite 310 Parsippany NJ 07054 973 377 9000...

Page 2: ...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 ma...

Page 3: ...2 2 Service Strategy 2 1 2 3 Opening the Meter 2 1 2 2 1 Separating the Top and Bottom Housings 2 1 2 4 Removing Replacing the Main Printed Circuit Board PCB 2 2 2 5 Replacing ST400D Internal Battery...

Page 4: ...00C Display 1 7 1 3 Starter 300D Display 1 9 1 4 Starter 400D Display 1 11 2 1 Screws securing Top Housing 2 2 2 2 Main Printed Curcuit Board 2 2 2 3 Battery Spring 2 3 2 4 Replacing Main PCBA 2 3 2 5...

Page 5: ...epair and replacement procedures Chapter 3 Reset to factory settings Explains procedures for resetting the meter to factory default settings Chapter 4 Drawings and Parts Lists Contains exploded views...

Page 6: ...uirements Should be temperature controlled and meet meter specifications for temperature environmental requirements Must be free of vibrations such as fork lift trucks close by large motors air curren...

Page 7: ...ww ohaus com 1 6 SPECIFICATIONS Complete specifications for the Ohaus Starter portable meters are listed in Table 1 1 When a meter has been serviced it must meet the specifications listed in the table...

Page 8: ...01 mg L Temp 0 1 C Accuracy 0 2 mg L 8 mg L 0 3 mg L 8 to 20 mg L 0 3 C Barometric Range 50 0 to 115 0 kPa Resolution 0 1 kPa Accuracy 1 5 kPa Temp compensation ATC Salinity compensation 0 0 to 40 0...

Page 9: ...ess than 90 or offset 35 60 mV Electrode condition is not good or needs cleaning 2 Endpoint stability icon Auto endpoint icon 3 Measurement icon measurement or calibration is running 4 Calibration ico...

Page 10: ...6 Starter Series Portable Meter Service Manual TABLE 1 2 Control functions ST300 Notes 1 Short Press Press less than 1 seconds 2 Long Press Press and hold for more than 2 seconds 3 Press and hold the...

Page 11: ...bility icon Auto endpoint icon 2 Measurement icon measurement or calibration is running 3 Calibration icon Cal calibration in progress 4 Setup icon instrument is in the setup mode 5 Battery status ico...

Page 12: ...8 Starter Series Portable Meter Service Manual TABLE 1 3 Control functions ST300C Notes 1 Short Press Press less than 1 seconds 2 Long Press Press and hold for more than 2 seconds 3 Press and hold th...

Page 13: ...point mode meter judges the endpoint reading is stable and locks the reading automatically 3 Measurement icon measurement or calibration is running 4 Calibration icon Cal calibration in progress 5 Set...

Page 14: ...CHAPTER 1 GETTING STARTED Ohaus Corporation www ohaus com 1 10 Starter Series Portable Meter Service Manual TABLE 1 4 Control functions ST300D...

Page 15: ...e condition is acceptable 4 Measurement icon measurement calibration is running 5 Calibration icon calibration is running 6 Power state icon include power always on icon means meter will not automatic...

Page 16: ...t manual endpoint mode Confirm setting confirm entered value for setting switch between auto endpoint and manual endpoint mode Start calibration Review the latest calibration data Meter turn on Back t...

Page 17: ...D and 400 are designed to be replaced rather than repaired This includes the Main Printed Circuit Board PCB For an illustrated list of replaceable parts see Chapter 5 2 3 OPENING THE METER Use these p...

Page 18: ...rate Top Housing from Bottom Housing 2 4 Removing Replacing the PCB If the PCB are suspected of being faulty it should be replaced as follows 1 Separate the top and bottom housing as in 2 3 1 2 Remove...

Page 19: ...re 2 3 4 After removing the battery spring gently lift up the main PCBA and slide down wards in order to remove the PCBA from the bottom housing 5 Replaced with a new main PCBA 6 Reconnect the battery...

Page 20: ...type CR2032 on the main PCBA 1 Follow instruction 2 3 1 Separating the Top and Bottom Housing 2 Follow instruction 2 4 Removing Replacing the PCB 3 Flip the Main PCBA locate the battery and replaced...

Page 21: ...sly for 3 seconds the screen displays and blinks means Reset Then we have 2 choice Press button Read to reset factory settings MTC slope and offset etc Or press button Exit to quit the setting and tur...

Page 22: ...not recognize the buffer Make sure the buffer is correct and fresh check if the buffer has not been used more than once Error 9 The current data set has already been stored once An endpoint reading ca...

Page 23: ...1 out of range Make sure the buffer is correct and fresh Clean or replace the DO electrode Error 9 The current data set has already been stored once A measurement can only be stored once Perform a ne...

Page 24: ...Service Manual Recall memory fail Meter displays No Data When recall memory while no data memorized yet The current data set has already been stored once Meter displays Already saved A measurement ca...

Page 25: ...The meter MUST meet the parameters of all applicable specifications in this manual Step to confirm the meter operates within specification 1 Obtain a known good working condition electrode and buffer...

Page 26: ...ortable Meter PARTS Figure 4 1 ST300 ST300C and ST300D Parts TABLE 4 1 ST300 ST300C and ST300D Meter PARTS Drawing Item Description 1 SP Housing STARTER 300x 2 SP Overlay ST300x EN 3 SP Overlay ST300x...

Page 27: ...us com 4 2 ST400D Portable pH Meter PARTS Figure 4 2 ST400D Parts TABLE 4 2 ST400D Meter PARTS Drawing Item Description 1 SP Housing STARTER 400D 2 SP Overlay ST400D EN 3 SP Overlay ST400D ZH 4 SP PCB...

Page 28: ......

Page 29: ...30257132 P N 30257132A SERVICE MANUAL Starter Portable Series...

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