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Model SR775L 
Service Manual - S/N 1035+ 
Part No. MAN775L_100929 

 

Page 1 of 16 

 
 

S

Instruments, Inc.

600 Young Street, Tonawanda, NY  14150 

Tel:  716-693-5977     Fax:  716-693-5854    URL:  

www.srscales.com

 

email:  

[email protected]

        

Copyright 2010

 

S

Instruments, Inc. 

 
 

by 

S

 Instruments, Inc.

 

 

 
 

 

 
 
 
 
 
 
 
 
 
 
 
 
 

Operating and Service 

Manual 

Serial Numbers:  1035+

 

Model SR775L 

Wheelchair Scale System

 

Summary of Contents for SR775L

Page 1: ...SInstruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2010 SInstruments Inc by S Instruments Inc Operating and Service Manual Serial Numbers 1035 Model SR775L Wheelchair Scale System ...

Page 2: ... FIGURES 2 PACKING CHECKLIST SR775L 3 ASSEMBLY 4 SYSTEM DESCRIPTION AND INTENDED USE 5 MAINTENANCE AND CLEANING 5 STORAGE AND TRANSPORTATION 6 SPECIFICATIONS 7 BUTTON FUNCTIONS 8 BASIC SYSTEM OPERATION 9 DISPLAY ERROR CODES 10 BATTERY REPLACEMENT 10 THEORY OF OPERATION 11 CALIBRATION 12 WARRANTY 15 TABLE OF FIGURES Figure 1 Scale Assembly 4 Figure 2 Battery Compartment Cover 4 Figure 3 Button Disp...

Page 3: ...716 693 5854 URL www srscales com email sri srinstruments com Copyright 2010 SInstruments Inc PACKING CHECKLIST SR775L Wheelchair Scale System DESCRIPTION Qty MAST ASSEMBLY 1 ea BASE ASSEMBLY 1 ea NYLON INSERT LOCK NUTS 4 ea PACKAGE OF SIX 6 D CELL BATTERIES 6 ea QUALITY CONTROL CHECKLIST 1 ea CALIBRATION CERTIFICATE 1 ea MODEL SR775L MANUAL 1 ea ...

Page 4: ...te Be sure to put Display Assembly Cable Connector 7 through corresponding hole in Base Assembly STEP 4 Insert the four 3 8 Flats Socket Head Cap Screws 5 provided to attach the Mast Assembly to the Base Assembly STEP 5 Gently position the scale system TEP 6 Plug the Display Assembly Cable Connector following loor on its side Loosen the battery compartment cover screws to open the Battery Compartm...

Page 5: ...m the gross weight of patient and equipment so only the net weight of the patient will be displayed and stored in memory The scale comes equipped with dual side ramps to facilitate access when using wheelchair bound patients When not in use or when moving the scale the dual ramps are folded up and onto the scale surface INTENDED USE The SR775L is designed for use as a portable patient weighing sys...

Page 6: ...STORAGE If storing this equipment for extended periods or longer than three 3 months remove the batteries To maintain proper operation of this instrumentation storage and transport conditions should not vary outside the following conditions Relative Humidity 0 to 85 Ambient Temperature 10 C to 50 C TRANSPORTATION To transport the SR775L tilt the scale back and roll on the built in wheels to anothe...

Page 7: ...n KEYPAD TARE Pre programmable TARE value to allow patient s net weight to be viewed AUTOMATIC SHUT OFF Programmable to OFF 60 120 180 seconds AVERAGING Automatic digital filter POWER SUPPLY Six 6 D cell batteries Low battery indicator on Display OPERATING CONDITIONS Normal operating conditions for this product Ambient Temperature Range 5 C to 35 C Relative Humidity Range 0 to 85 non condensing Av...

Page 8: ...OSS WEIGHT mode and display will zero LB KG MODE The LB KG button factory default setting allows user to toggle between viewing data in pounds or kilograms Alternative options can display pounds only or kilograms only deactivating the LB KG button WEIGH The WEIGH button starts the scale and displays the patient s weight The display lights all segments on LCD shows the software revision level and t...

Page 9: ...ight After Automatic Shut Off simply press the WEIGH button to re activate the scale SETTING TARE Place the empty wheelchair chair walker with any blankets or pillows that the patient may have with them on the scale platform Press the ZERO button to tare the object s weight The display will read 0 0 Remove the wheelchair from the platform Place the patient in the wheelchair Place the wheelchair on...

Page 10: ... ensure that the scale is level and re zero vvvv Data input to electronics too low Check the Display Assembly Cable Connection BATTERY REPLACEMENT STEP 1 When the batteries are low and need to be replaced the LOW BATTERY display symbol will light up on the display STEP 2 Gently position the scale system on its side to access the Battery Compartment STEP 3 Figure 4 Unscrew the two screws holding th...

Page 11: ...rt the physical movement of the force cell due to the applied mass on the system into minute changes in electrical resistance These changes in resistance produce a voltage difference across the Wheatstone bridge The output of the Wheatstone bridge is digitized by a sigma delta analog to digital converter The data is transferred to the micro controller The micro controller averages and filters the ...

Page 12: ...f these procedures are found below ACCESS SYSTEM SETUP Ensure scale is level before proceeding To access all settings below break the Calibration Seal and open the right hand end cap Seal must be replaced by a certified technician Push the calibration switch right to the CAL position Figure 4 using the eraser end of a pencil or similar item Display arrow on the top right will light up CAUTION ESD ...

Page 13: ...e display to zero The ZERO and STABILITY DETECTION display symbols will light up At that time place calibrated weight s onto the scale It is recommended that the full 280 kilograms be used for calibration STEP 5 Using the numeric keypad enter the value of the total calibrated weight placed on the scale STEP 6 Press the ENTER button to save the selection or the CLEAR button to exit the menu without...

Page 14: ...tory default setting When selected both display symbols will light up Weight readings will display in either pounds or kilograms Pressing the kg lb button toggles between display units at any time during the weigh process LB only When selected the lb display symbol will light Weight readings will display in pounds only The kg lb button is deactivated KG only When selected the kg display symbol wil...

Page 15: ... it neither assumes nor authorizes any other person to assume for SR Instruments Inc any other liabilities in connection with the sale of said articles In no event shall SR Instruments Inc be liable for any subsequent or special damages Any misuse improper installation or tampering shall void this warranty DAMAGED SHIPMENTS Title passes to purchaser upon delivery to Transportation Company Any clai...

Page 16: ...5L_100929 Page 16 of 16 SInstruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2010 SInstruments Inc By SInstruments Inc Precision Technology in Perfect Balance ...

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