SR Scales SR775L Operating And Service Manual

Model SR775L
Service Manual - S/N 1035+
Part No. MAN775L_100929 Page 1 of 16

by S Instruments, Inc.

Model SR775L

Wheelchair Scale System

Operating and Service

SInstruments, Inc.

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

Manual

Serial Numbers: 1035+

, 600 Young Street, Tonawanda, NY 14150

Copyright 2010 SInstruments, Inc.

Model SR775L
Service Manual - S/N 1035+
Part No. MAN775L_100929 Page 2 of 16

TABLE OF CONTENTS

TABLE OF 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 Display ................................................................................................................ 8

Figure 4: Battery Compartment .................................................................................................. 10

Figure 5: Calibration Switch........................................................................................................ 12

SInstruments, Inc.

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

, 600 Young Street, Tonawanda, NY 14150

Copyright 2010 SInstruments, Inc.

Model SR775L
Service Manual - S/N 1035+
Part No. MAN775L_100929 Page 3 of 16

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

SInstruments, Inc.

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

, 600 Young Street, Tonawanda, NY 14150

Copyright 2010 SInstruments, Inc.

Model SR775L
Service Manual - S/N 1035+
Part No. MAN775L_100929 Page 4 of 16

ASSEMBLY

STEP 1: Unpack the scale system and check parts

against the PACKING CHECKLIST. If there are
any missing or damaged parts, call the local sales
representative.

STEP 2: Verify that the serial number on the Display
Assembly (1) and the Base Assembly (3) match.

IMPORTANT: All of the scale systems are calibrated
at the factory as a complete system. Components
should not be interchanged with other systems.

1

# PART NAME

Display Assembly

1

Mast Assembly

2

Base Assembly

3

Ramps

4

Flat Socket Head Cap Screws (4)

5

Battery Compartment Cover

6

Display Assembly Cable Connector

7

STEP 3: (Figure 1) Place the Mast

Assembly (2) onto the Base Assembly as
shown. Note: Be sure to put Display
Assembly Cable Connector (7) through
corresponding hole in Base Assembly.

2

4

5

3

Figure 1: Scale Assembly

TEP 6: Plug the Display Assembly Cable Connector

S

(7) into its mate in the battery compartment.
STEP 7: Insert the six (6) “D” cell batteries

following
directions on the Battery Compartment Cover. Close and
sec u r e l y s cre w th e B a t t e r y Co mpa r t m e n t Cover into place.

STEP 8: Gently return scale to an upright, level position
on the f

loor.

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
on its side. Lo o s e n t h e battery compartment
cover screws to open the Battery
Compartment Cover (6) (Figure 2).

6

7

SInstruments, Inc.

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

Figure 2: Battery Compartment Cover

, 600 Young Street, Tonawanda, NY 14150

Copyright 2010 SInstruments, Inc.

Model SR775L
Service Manual - S/N 1035+
Part No. MAN775L_100929 Page 5 of 16

SYSTEM DESCRIPTION and INTENDED USE

SYSTEM DESCRIPTION

The SR775L Scale System employs the latest in microprocessor and load cell technology to
provide precise and repeatable weight data.

The low power microprocessor circuitry derives its power from batteries that will provide up to
400 hours of weight readings before needing replacement. This eliminates the need for an external
battery charger or the danger of a plug-in power supply.

The SR775L also incorporates a keypad tare, which allows the caregiver to preset a pre­determined tare value that can represent the weight of the wheelchair, walker, chair, etc., to be
used when weighing the patient. This amount will be automatically subtracted from 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 system for ambulatory and non-ambulatory
wheelchair bound patients, or those that need to be
supported by a chair or walker. Maximum weight
capacity must not exceed 1000 pounds or 454
kilograms gross weight.

MAINTENANCE and CLEANING

Exercise caution when cleaning the display
window of the SR775L as it is made of
clear polyester and can be scratched by
abrasive cleaners. It is recommended to use
mild soap and water for general cleaning
and disinfecting. DO NOT use vinegar to
clean the display.

DO NOT use pressurized water or steam. The
scale system contains microprocessor circuitry
and strain gauge sensors that may be adversely
affected by exposure to such an environment.

WARNING

DO NOT EXCEED

MAXIMUM WEIGHT LIMIT OF

1000 LB / 454 KG

WARNING

SInstruments, Inc.

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

, 600 Young Street, Tonawanda, NY 14150

Copyright 2010 SInstruments, Inc.