Model 4500
Wheelchair Scale
OPERATOR’S MANUAL
s
Kilo
nds
Pou
T
IGH
WE
RO
ZE
DS
OS
UN
PO
”
b
utt
on
ze
ro
nti
l
h
“
ON
Pus
om
ta.c
ani
w.t
t
w
ai
u
ww
and
KIL
re
efo
s
b
ear
app
le
sca
on
ON
F
OF
pp
ing
ste
Cautions and Warnings ......................................................1
Assembly Instructions ........................................................2
Before Assembly
Assembling the Scale
Attaching Control Box to Handrail
Leveling the Platform
Battery Charging ..................................................................3
Charging the Battery
Product Description ............................................................3
Control Panel Box
Special Features
Specifications
Operating Instructions ........................................................4
As a Wheelchair Scale
As a Chair Scale
As a Stand-on Scale
Care and Maintenance ........................................................6
Cleaning
Calibration
Troubleshooting Guide ........................................................6
Parts Lists ............................................................................7
Warranty................................................................................9
ASSEMBLY INSTRUCTIONS
Fig. 1
Before Assembly
1/4-20 x 5/8"
Allen Bolts
Wheel
63970
NOTE: Carefully inspect all cartons for shipping damage
before unpacking. If damage is found, contact your
shipper or Tanita Corporation immediately. Claims must
be filed with the shipper as soon as possible after receipt
of the damaged package.
Handlebar
63949
One carton containing: Handlebar with wheels, platform,
and 2 parts boxes. (Model 4500 only—separate insert
with ramp and front and side rails.)
One parts box containing: AC adaptor and storage
bracket, C-clamp, twelve (12) locknuts, three (3) cable
clamps, hex key, hex bolts, and sheet of adhesive labels.
Another small box containing: The electronic
control panel box.
1/4-20 x 5/8"
Allen Bolts
IMPORTANT: After assembling the scale, charge the
battery in the control panel box using the procedure
under “Charging the Battery” on page 3. This will restore
any power lost during storage and shipment.
Rubber Mat
63881
Tools Needed: Adjustable wrench or 7/16" socket or
open-end wrench.
Platform
Assembling the Scale
1. Place the platform on the floor near a table or chair
and turn the platform up on its front edge with the
platform top (matted surface) facing the table or chair.
NOTE: The front edge of the platform is the 24" side
without the large hole.
Fig. 2
Handlebar
63949
2. Thread the control cable with connector (63826)
through the large hole in the back edge of the platform
so that the cable is on the outside of the platform.
Side Rail
3. While resting the top portion of the handlebar on the
table or chair, fasten the handlebar to the platform with
eight 1/4-20 x 5/8" bolts and nuts. (Fig. 1)
1/4-20 x 5/8"
Hex Bolts
4. Screw a leveling foot into each corner of the platform
bottom. Leave 1/4" of thread showing.
Rubber Mat
63881
5. Put the scale back on its feet.
Model 4500 Wheelchair Scale Only: Follow steps 6-8
to finish assembly of the Wheelchair Scale.
6. Mount the ramp to the platform edge, and secure by
inserting the pin on the side of the ramp into the
bushing next to the wheel.
Hex Bolts
7. Mount the front rail by placing the rail’s bushing over
the other pin on the ramp. Fasten the rail to the
platform with three 1/4-20 x 5/8" hex head bolts.
(Fig. 2)
Front Rail
Ramp
(Model 4500 only)
8. Fasten the side rail to the platform side opposite the
ramp with three 1/4-20 x 5/8" hex head bolts. (Fig. 2)
2
Attaching Control Panel Box to Handrail
Charging the Battery
1. Find the control panel box, transformer bracket,
C-clamp and four (4) locknuts.
A. Plug the battery charger power cord into the 3-prong
jack on control panel box. Secure to handrail with clips.
2. Attach the control panel box to the center handlebar
rail using the C-clamp. Also mount the transformer
bracket on two of the studs extending through the
C-clamp. Secure the control panel box with the (4)
locknuts.
B. Plug the battery charger into a 120 VAC outlet.
C. The battery will fully charge in 8 hours. THE SCALE
MAY BE USED WHILE THE BATTERY IS CHARGING.
NOTE: The battery cannot be overcharged by the
specially designed charger built into this scale. Do not use
any other charger or adapter, otherwise SERIOUS
DAMAGE TO THE SCALE OR BATTERY CAN RESULT.
3. Attach the cable lead to the 5-prong jack on the
side of the control panel box. Secure by turning
the knurled ring. Use clips to secure cable to handrail.
Optimum battery life will be obtained if the scale is
operated and stored connected to 120 VAC. Always check
plug to see if scale is charging before moving.
STORAGE: When storing the scale for an extended
period of time (and the unit is not connected to a
120 VAC), the battery should be fully charged. The
battery should then be charged every three months.
A discharged battery should be recharged as soon as
possible to prevent its useful life from decreasing
significantly. A discharged battery left in the scale can
leak and cause permanent damage to the battery and
scale. Store the unit in a cool, dry place.
Control Box
Clamp 63935
PRODUCT DESCRIPTION
Adapter Bracket 63925
Control Panel Box
The 4500 control panel keypad has four membrane
switches. The POUNDS, KILOS, and ZERO switches
have both primary and secondary functions listed below.
Only the primary functions are listed on the switch.
Leveling the Platform
To level or adjust the height of the scale platform,
carefully tilt the scale and turn the leveling feet either
into or out of the platform underside.
NOTE: Adjust platform height so it does not touch floor
or carpet. An incorrect weight reading will result if the
ramp touches the floor or carpet.
Pounds
Kilos
Keypad
63911
WEIGHT
ZERO
POUNDS
KILOS
Push “ON” button
and wait until zero
appears before
BATTERY CHARGING
stepping on scale
The rechargeable battery in this scale is similar to the
no-maintenance lead-acid batteries used in automobiles.
Since the battery is sealed, no checking of water level
or adding of water to the battery is necessary. However,
recharging at proper intervals and proper storage
procedures are necessary, similar to an automobile
battery. A fully charged battery will provide approximately
250 normal weighings before requiring recharging.
When the display flashes “Lo-b,” the battery needs to
be recharged.
ON
OFF
3
Switch Primary Function Secondary Function
Specifications
On/Off
Depress to turn scale
on or off.
Dimensions (Transport Position)
Height ......................................................................44"
Width ........................................................................23"
Length ......................................................................27"
Weight (no package included) ..............................55 lb.
Kilos
Depress to display
weight in kilograms
(light over switch will
illuminate to indicate
kilogram mode).
While in Kilos mode, depress for average
reading when excessive movement
prevents stationary measurement.
Depress after any reading to “lock”
reading. Reading remains displayed for
approximately 1 minute after patient is
removed from scale, or until switch is
depressed again. Kilos light will flash to
indicate average or locked reading.
Power Requirements
Input Power ..........................................120 VAC/60 Hz
Rechargeable Battery ..........................................8 Volt
Minimum Charge Life ..............................250 Readings
Recharge Time ................................................8 Hours
Depress while in Pounds mode to
average reading.
Pounds
Depress to display
weight in pounds
(light over switch will
illuminate to indicate
pounds mode).
Operating Conditions
Depress after any reading in pounds
mode to “lock” in reading. Light will flash
to indicate average or locked reading.
Temperature/Humidity ............................Normal Room
Temperature and Humidity
Depress after initial weight is taken to
reweigh individual.
Zeros readout
Zero
(zeros out the weight
of foreign object,
e.g. blanket placed
on platform).
Scale Description
Type..........................................................Strain Gauge
Maximum Capacity ................................800 lb./363 kg.
Resolution..............................................0.1 lb./100 gm.
Accuracy ............................................ 0.1 lb./100 gm.
Maximum Zero Weight ..........................12.5 lb./5.6 kg.
Special Features
Tanita Corporation’s electronic scales come standard with
these special features:
OPERATING INSTRUCTIONS
1. Autozero: The scale will automatically display “0” when
turned on. If a foreign object is placed on the platform
before turning the scale on, it will automatically zero
out that object’s weight.
As a Wheelchair Scale
When using the 4500 Wheelchair Scale, the weight of
the wheelchair must be taken into account. Weigh the
wheelchair by itself to determine its weight and then
subtract this weight from the combined weight of patient
and wheelchair.
2. English-Metric Readout: You may switch between
metric (kilos) and English (pounds) readouts before or
after a reading, and the scale will convert one reading
to the other.
IMPORTANT: Adjust platform height so that ramp does
not touch floor or carpet. An incorrect weight reading
will result if the ramp touches the floor or carpet. (See
Section “Leveling the Platform” on page 3.)
3. Recalculate Weight: If the first reading of a patient’s
weight is suspect, a second reading can be taken
without removing the patient from the scale. To reweigh
the patient, simply depress the Zero switch.
4. Average Weight: In most cases, the scales display an
actual weight based on a series of consistent stable
measurements. However, if the wheelchair/patient
keeps moving, the scale may not get the readings
required to give a “stable weight.” In these instances
an average weight can be determined by activating
the Average Locking feature. Depress the Pounds (or
Kilos) switch (dependent upon measurement mode).
The indicator light should start flashing. A weight
should appear in place of the moving dashes. Depress
the Pounds or Kilos switch again to deactivate the
feature.
Weighing the Wheelchair
1. Turn scale on by depressing the On/Off switch. Wait for
the display to show “0.”
2. Roll the empty wheelchair onto the scale. Wait for the
moving dashes to lock in and display the weight of the
wheelchair.
3. Record the wheelchair weight.
4. Remove the wheelchair from the scale platform and
turn scale off.
5. Zero Ability: The operator can zero out the weight of
a chair, etc., upon which a patient is to be weighed.
4
Taking a Weight Measurement
Taking a Weight Measurement
1. Turn scale on. Wait for the display to show “0.”
1. Once the chair weight has been zeroed out and the
display reads “0,” have the patient sit on the chair.
2. Wheel the patient onto the scale platform. Then
lock the wheels to prevent rolling during weighing.
2. The moving dashes will lock in and display the
patient’s weight.
3. The moving dashes will lock in and display the
weight measurement.
3. Weight measurement should automatically be
displayed on the control panel box console.
• Measurement automatically defaults to pounds.
If kilograms are required, push the Kilos switch.
• Measurement automatically defaults to pounds.
If kilograms are required, push the Kilos switch.
• If a reweigh is required, depress the Zero switch.
• If a reweigh is required, depress the Zero switch.
4. Deduct the wheelchair weight from the displayed
weight to obtain the patient’s weight.
4. Excessive movement may prevent a repeatable
reading. In this case, a series of moving dashes
continues to appear on the console rather than a
weight reading. If moving dashes persist, activate the
“Average Lock” by depressing the appropriate Pounds
or Kilos switch to obtain an average reading of the
patient’s weight.
5. Excessive movement may prevent a repeatable
reading. In this case, a series of moving dashes
continues to appear on the console rather than a
weight reading. If moving dashes persist, activate the
“Average Lock” by depressing the appropriate Pounds
or Kilos switch to obtain an average reading of the
patient’s weight.
Note: This reading is now an instantaneous average
of weights that the computer calculates.
NOTE: This reading is now an instantaneous average
of weights that the computer calculates.
5. After weight measurement is obtained and recorded,
have the patient step off the scale.
6. After the weight measurement is obtained and
recorded, remove the patient from the scale.
6. Depress the On/Off switch to turn scale off.
7. Depress the On/Off switch to turn the scale off.
As a Stand-on Scale
As a Chair Scale
1. Turn the scale on. Wait for display to read “0.”
When using the Wheelchair Scale as a Chair Scale, the
weight of the chair used to seat the patient on the scale
must be taken into account. This is accomplished by
weighing the chair by itself to zero-out its weight.
2. Have the patient step onto the scale platform.
3. The moving dashes will lock in and display the
patient’s weight.
• Measurement automatically defaults to pounds.
If kilograms are required, push the Kilos switch.
Failure to correctly zero out the weight of the chair will
result in incorrect patient weight readings.
• If a reweigh is required, push the Zero switch.
Weighing the Chair
Note: This reading is now an instantaneous average
of weights that the computer calculates.
METHOD 1
4. Excessive movement may prevent a repeatable
reading. In this case, a series of moving dashes
continues to appear on the console rather than a
weight reading. If the moving dashes persist, activate
the “Average Lock” by depressing the appropriate
Pounds or Kilos switch to obtain an average reading
of the patient’s weight.
1. Scale is off.
2. Place the empty chair on the scale platform.
3. Turn the scale on. The scale will now zero
out the weight of the chair leaving a “0” reading on
the display.
METHOD 2
5. After weight measurement is obtained and recorded,
have the patient step off the scale.
1. Turn the scale on. Wait for display to read “0.”
2. Place the empty chair on the scale platform. The
display will read the chair’s weight.
6. Depress the On/Off switch to turn scale off.
3. Depress the Zero button to zero out the weight of
the chair. The display should read zero again.
NOTE: The Zero button has a dual function. If the
weight of the chair is greater than 12.5 lbs., the scale
will reweigh the chair instead of zeroing it out when
the button is depressed. IN THIS CASE, YOU MUST
USE METHOD 1 TO ZERO OUT THE WEIGHT OF
THE CHAIR.
5
7. Remove weight and depress Zero switch. Wait for a
display reading of “0.” Again add known weight to
platform. If reading is correct, no further adjustments
are necessary. If reading is incorrect, repeat steps 5
and 6 until correct reading is obtained.
CARE AND MAINTENANCE
Proper care and cleaning of all Tanita Corporation scales
and accessories is essential to ensure a long life of
accurate and effective operation. In addition to routine
cleaning, include a regular check of all structural
apparatus to ensure stability.
TROUBLESHOOTING
Cleaning
The following guide will help you to solve
common problems:
Disconnect battery charger from scale before cleaning.
1. All external surfaces can be wiped clean with a damp
cloth. Mild soap and water solution may be used. Wipe
unit dry with a clean, soft cloth.
PROBLEM
SOLUTION
Incorrect patient
weight readings
A. Platform too low and hitting platform feet or
carpet. Increase platform height. See “Leveling
the Platform” on page 3.
2. DO NOT immerse control panel box into cleaning or
other liquid solutions.
B. Person, other than person being weighed,
touching or leaning on scale handlebar.
3. DO NOT use isopropyl alcohol or other solutions to
clean surface of control panel box.
C. Weight of wheelchair or chair not taken into
account. See “Operating Instructions” on page 4.
4. Check the overall appearance of the whole scale for
any obvious damage, wear and tear. Inspect the AC
cord and adapter for cord cracking or fraying or for
broken or bent prongs.
D. Platform not level. See “Leveling the Platform”
on page 3.
Recharge battery. See “Charging the Battery”
on page 3.
Display flashes “Lo-b”
Calibration
Check scale calibration and calibrate if necessary.
See “Calibration” on page 6.
Patient weight readings
consistently too high
or too low
Note: Your scale has been accurately calibrated at the
factory. However, there is always a possibility that the
calibration changed due to jarring during shipping. The
following procedure should be followed to check and/or
correct any error in calibration.
1. Depress On/Off switch on scale and wait for a display
of “0.”
2. Place an accurately known weight on the platform.
3. If display is other than known weight, then the scale is
out of calibration.
4. Remove the 4 screws nearest the face switch panel
(2 on each side — near the aluminum trim). Slightly
loosen the remaining 4 screws (2 on each side), but
do not remove. Lift off the top portion of the head.
Be careful, since it is attached to the bottom
portion with a ribbon cable. Looking at the bottom
front of the head (underneath), you will see 2 small
adjustment screws. The left metal screw (VR2) is for
coarse adjustments; it adjusts for large errors. The right
plastic screw (VR1) is for fine adjustments; it adjusts
small errors.
5. Turn the metal coarse calibration screw (VR2) in small
increments, CLOCKWISE to increase weight or
COUNTERCLOCKWISE to decrease weight. In most
cases, this is the only adjustment needed.
6. If necessary, make adjustments with the right plastic
screw (fine adjustment). CLOCKWISE to decrease
weight; COUNTERCLOCKWISE to increase weight.
6
PARTS LIST
COMPUTER BOARD
DISPLAY BOARD
Qty
Part Description
Qty Part Description
Location
Qty Part Description
Location
1
1
1
2
4
4
1
3
1
RES.CF 120 1/4W 5%
RES. CF 10K 1/4W 5%
TRANS. NPN GEN MPS3704
LED DISCRETE T-1 3/4 RED
7-SEG DISPLAY
1
1
1
1
1
1
2
RES. MOX .47 1W 5%
RES. CF 2.7 1/4W 5%
RES. CF 10 1/4W 5%
RES. CF 22 1/4W 5%
RES. CF 150 1/4W 5%
RES. CF 120 1/4W 5%
RES. CF 560 1/4W 5%
R4
R2
R12
R7
R29
R6
R13
R14
R3
1
3
CAP MONO CER .47UF 50V
CAP TANT 1UF 35V
C22
C3
C14
C16
C2
1
2
CAP ELE 4.7UF 50V
CAP ELE 47UF 25V
C6
IC SOCKET, 14 PIN
C10
C11
C1
HEADER, 6 PIN .100C RT
JUMPER, .6 IN 22ga
1
3
CAP ELE 100UF 25V
CAP ELE 470UF 25V
4
RES. CF 1K 1/4W 5%
RIBBON CABLE, 16 COND
R5
C7
R15
R50
R48
R18
R37
R1
R16
R22
R32
R44
R45
R21
R49
R38
R40
R27
R47
R8
C12
X1
Q1
Q2
Q3
Q4
Q5
Q7
Q8
1
4
CERAMIC RES. 4.00MHz
TRANS. PNP PWR 2N6728
1
2
RES. MF 2.00K 1/4W 1%
RES. CF 2.2K 1/4W 5%
PARTS AND ACCESSORIES
Description
Part No.
63812
63648
63663
63999
63878
63866
63970
63949
63935
63826
63894
63932
63925
63881
63984
4
RES. CF 3.9K 1/4W 5%
Battery Transformer/AC Adapter
Rechargeable Battery
Display Board w/cable
7 Segment Display
R4
2
1
TRANS. PNP PWR TIP32
TRANS. PNP GEN MPS3702
2
RES. MF 4.02K 1/4W 1%
13 TRANS. NPN GEN MPS3704
Q6
Q9
Ramp Kit
1
1
2
RES. CF 4.7K 1/4W 5%
RES. MF 9.31K 1/4W 1%
RES. CF 10K 1.4W 5%
Q10
Q11
Q12
Q13
Q14
Q15
Q16
Q17
Q18
Q19
Q2
CR1
CR7
CR14
CR15
CR2
CR3
CR4
CR5
CR6
CR8
CR9
CR10
CR11
CR12
CR13
U1
U2
U3
U4
U7
U5
U6
U8
U9
J2
J3
J5
J1
U3
Q7
Wheel
Handlebar
Control Box Clamp
Transformer Cable with Connector
3-Prong Jack
2
7
RES. CF 15K 1/4W 5%
RES. CF 27K 1/4W 5%
5-Prong Jack
R9
Adapter Bracket
Rubber Mat
R10
R11
R17
R43
R46
R19
R24
R25
R28
R30
R31
R26
R23
R34
R35
R36
R41
R42
R20
R39
R33
RN1
VR1
VR2
C4
Shipping Carton
4
1
DIODE SIGNAL 1N4148
6
1
RES. CF 33K 1/4W 5%
RES. CF 150K 1/4W 5%
DIODE ZENER 9.1V 1N4739A
10 DIODE REC 600V 1N4005
1
4
RES. MF 301K 1/4W 1%
RES. MF 402K 1/4W 1%
1
1
1
1
1
1
1
1
1
1
1
1
3
RES. CF 470K 1/4W 5%
RES. CF 3.3M 1/4W 5%
RES. CF 1/4W 5%
RES. NETWORK 220
POT 1K 1 TURN
2
IC REG 5V 7805
1
2
IC MICROPROCESSOR
IC DUAL OP-AMP LM358N
POT 25K 20 TURN
1
1
1
1
2
IC HEX INV BF CD4049UBE
IC QUAD B SW CD4016BE
IC OP-AMP ICL7652CPD
IC DUAL COMP LM393N
HEADER 2PIN .156C
CAP CER NPO 22PF 50V
CAP CER 100PF 50V
CAP CER .001UF 50V
CAP MY .001UF 100V
CAP PS AX .0047UF 50V
CAP TANT 4.7UF 25V
CAP MONO CER .1UF 50V
C5
C18
C9
C17
C15
C19
C20
C8
1
1
1
1
4
4
HEADER 5PIN .156C
IC SOCKET 16PIN
IC SOCKET 28PIN
HEATSINK TO-220
SCREW, 4-40 X 3/8
NUT, 4-40 KEPS
1
1
CAP PC AX .1UF 100V
CAP MONO CER .22UF 50V
C21
C13
* Value may change depending on gain requirements of scale model
7
WARRANTY
Tanita Corporation (“Tanita”) warrants that for a period of three years from the date of
purchase, this product will be free from defects in material and workmanship. This
warranty covers all components of this scale, with the exception of the AC adapter.
The AC adapter is warrantied for one year. Tanita, at its option, will repair or replace this
product or any component of the product found to be defective during the warranty
period. Replacement will be made with a new or remanufactured product or component.
If the product is no longer available, replacement may be made with a similar product of
equal or greater value. This is your exclusive warranty.
This warranty is valid for the original purchaser from the date of initial purchase and is
not transferable. Tanita dealers, service centers, or retail store outlets selling Tanita
products do not have the right to alter, modify or in any way change the terms and
conditions of this warranty.
The warranty does not cover normal wear of parts or damage resulting from negligent
misuse of the product. Further, the warranty does not cover Acts of God, such as fire,
flood, hurricanes, and tornadoes.
Tanita shall not be liable for any incidental or consequential damages caused by the
breach of an express or implied warranty or condition. Except to the extent prohibited by
applicable law, any implied warranty of merchantability or fitness for a particular purpose
is limited in duration to the duration of the above warranty. Tanita disclaims all other
warranties or conditions, express or implied statutory or otherwise. Some provinces or
jurisdictions do not allow the exclusion or limitation of incidental or consequential
damages or limitation on how long an implied warranty lasts, so the above limitation or
exclusion may not apply to you. This warranty gives you specific legal rights, and you
may also have other rights that vary from state to state or province to province.
How to Obtain Warranty Service
Call (877) 682-6482 to obtain a Return Authorization for warranty service. Then, send
the product with proof of purchase included. Ship with freight and insurance prepaid to:
Tanita Corporation of America Inc.
Attn: R/A #______
102 Progress Drive
Saukville, WI 53080
Make certain that your scale is properly packed to avoid damage in transit to the
factory. If your scale is not covered by warranty, or has been damaged, an estimate
of repair costs or replacement costs will be provided to you for approval prior to
servicing or replacing.
Tanita Corporation of America, Inc.
2625 South Clearbrook Drive
Arlington Heights, IL 60005
Toll Free: (877) 682-6482
Direct: (847) 640-9241
Fax: (847) 640-7978
© 2003 Tanita
8
|