Scale-Tronix 5002 Service manual

ETRONIX
SECOND GENERATION WEIGHING SYSTEMS
5002 PORTABLE STAND ON SCALE
5102 PHYSICIAN'S OFFICE SCALE
5602 PORTABLE SURVEY SCALE
6002 PORTABLE WHEELCHAIR SCALE
6702 EXTRA WIDE WHEELCHAIR SCALE
6102 BUILT IN FLOOR SCALE
6202 RAMP SCALE
6502 CHAIR SCALE
OPERATING AND SERVICE MANUAL

SPECIFICATIONS:
5002 - PORTABLE STAND-ON SCALE
5602 - PORTABLE SURVEY SCALE
6102 - BUILT IN FLOOR SCALE
6502 - PORTABLE CHAIR SCALE
G RAL
Complete line of heavy-duty, high-perforrnance
weighing systems. Computer-controlled digital readout
and electronic weighing platforms provide the ultimate
in weighing systems for use by hospitals, nursing
homes, physician's offices, research faboratories, etc.
All scales employ user friendly controls and an easy to
follow operating procedure. Scales employ resistive
strain gauge transducer technology and have no
moving parts to service.
Models 5002, 6002, 6502, and 6702 are equipped with
large rubber tires for easy, silent running.
WEIGHING CAPACITY
5002 - 0-880 LB. (400 KG.)
5102 - 0-880 LB. (400 KG.)
5602 - 0-440 LB. (200 KG.)
6002 - 0-880 LB. (400 KG.)
6102-0-825 LB, (375 KG.)
6202 - 0-880 LB. (400 KG.)
6502 - 0-400 LB. (180 KG.)
6702 - 0-880 LB. (400 KG.)
RACY
Standard weight change accuracy and resolution on
most models is 0.1 pound / 0.1 kilogram (100 grams).
Some scales are provided with 1 pound (or other)
resolution depending on the application. Enhanced
accuracy options are available on some models.
WEIGHT DISPLAY
Large, bright, light emitting diode (LED) display.
Easily read in any lighting conditions. Weight
displayed in either Pounds or Kilograms,
Previous patient's weight held in memory. Weight can
be recalled after patient leaves scale.
Manual Part No. 50222 (-2) / 070032 (-2)
10/14/97
5102 ~ PHYSICIAN'S OFFICE SCALE
6002 - PORTABLE WHEELCHAIR SCALE
6202 - RAMP SCALE
6702 - PORTABLE EXTRA WIDE WHEELCHAIR SCALE
POWER SUPPLY
PORTABLE SCALES:
Disposable “D” size alkaline batteries.
(model 5602 employs "C" size batteries).
LINE POWERED SCALES:
100-120 VAC 50/60 Hz.
200-240 VAC 50/60 Hz. (Optional)
Note: Portable scales. can be supplied with line power
supply/rechargeable battery on special order.
OPTIONS
Paper tape printer available on 5002, 6002, 6102,
6502, and 6702.
Sturdy handrail available on 5002, 6002, and 6702 for
patient assistance.
Height gauge available on 5002, 6002, and 6702.
Line power option with or without rechargeable battery
available for models 5002, 6002, 6502, and 6702.
DATA OUTPUT
Optional RS-232 data part (most models).
DIMENSIONS
See specific section for each scale.
RRANTY
One (1) year, all parts and labor
FACTORY AND SERVICE
P. ©. Box 15, Wheaton, IL 60189
[phone]
MARKETING AND SALES
200 E. Post Rd., White Plains, NY 10601
[phone]

PATIENT WEIGHING SYSTEMS
TABLE OF CONTENTS PAGE
1 GENERAL DESCRIPTION 1
И ASSEMBLY - SET UP 5
山 OPERATION OF SCALES 9
м TECHNICAL DESCRIPTION 17
V PARTS LIST AND SCHEMATIC 33
VI WARRANTY 45
This User's manual is intended to provide ali necessary information and data for the proper operation and service of
the SECOND GENERATION PATIENT WEIGHING SYSTEMS manufactured by SCALE-TRONIX®, INC, This
manual should be studied before installing or placing the scale in service. Please store in a safe, handy place for
future reference. Additional manuals are available from SCALE-TRONIX®, INC. at a nominal charge. Refer to the
scale serial and model numbers in any and all correspondence.
Feel free to call the factory for service and operational assistance - 630-653-3377.

5002
STAND-ON
SCALE
WHEELCHAIR
SCALE
PARTS LIST
4
Weighing
platform
2. Mast
3
Readout
4. Wheels
5.
Steering
handle
and
hand
grip
6.
Handrail
(optional)
7.
Flaps
for
wheelchair
8.
Foot
rests
6502
CHAIR SCALE
5002, 5102,
5602, 6002,
6702,
6102, 6202,
6502

GENERAL DESCRIPTION
1.00 GENERAL
Congratulations! You have just purchased a
SECOND GENERATION WEIGHING SYSTEM from
SCALE-TRONIX®. These scales are derived from
earlier first-generation SCALE-TRONIX® weighing
scales and contain many improvements and numerous
hew features. The digital readouts contain the latest
microcomputer control system combined with user
friendly, robust software and DSP (digital signat
processing) to provide you with feature-rich, easy-to-use
scales for all applications. Many of the scale's
functional parameters can be customized by the
operator to suit specific needs and requirements.
Previously employed rechargeable batteries have been
replaced with disposable batteries. Typical battery life
is greater than one year under normal conditions.
Finally - a truly cordless, portable weighing system!
As regards non-portable scales, the power supply is
available for 100-120 VAC operation or can be specially
ordered for use on 200-240 VAC.
Audible response by a series of beeps provides
excellent operator feedback for ease of operation. (This
audio beeper can be switched off by the operator for
use in “low-stimulus” environments.) A shielded metal
feadout enclosure is provided for interference-free
operation. Some models provide an option for serial
data output to a computer, data collection system,
internal or external printer.
The scales described in this manual operate in a very
similar manner to each other. Different scale
configurations and weighing platforms are provided for
each unique and specific application.
SUCCESSIVE WEIGHING: An exclusive feature with
SCALE-TRONIX®. These scales will weigh multiple
patients without the operator having to "zero" or restart
the scale in-between patients. The scale will stay on as
long as required, DSP (Digital Signal Processing) and
the scale's internal microcomputer software know when
successive weighing is taking place and will keep the
scale turned on. Shortly after the last patient is weighed
the scale shuts itself off automatically to conserve
batteries. The shut-off time delay is selectable and field
programmable. The time delay to tum off can be easily
changed to suit unique requirements.
RECALL: The weight of the patient is stored in memory
and can be recalled by a touch of a button. Thus the
problem of forgetting the patients weight has been
solved. The recalled weight can be displayed in either
pounds or kilograms.
REWEIGH: A press of the button allows reweighing
while the patient is still on the scale; there is no need to
remove the patient from the weighing platform and start
over.
PRINTER: An optional paper tape printer is available
on most models of scales to provide a printed record of
the patients weight. This printer mounts to the back-
side of the digital readout on some models (5002, 6002,
6502, 6702), or is built directly into the readout cabinet
(models 6102 and 6202).
DATA OUTPUT: RS-232 serial data output to a
computer, data collection system, or external printer is
available on most models as an option. Consult the
factory for further details.
1.10 5002 PORTABLE STAND-ON SCALE
The 5002 provides an increased weighing
capacity of 880 pounds (400 Kilograms) and a larger
patient weighing platform (18 x 19.5 inches vs 14 x 18)
than its predecessor, the SCALE-TRONIX® model 5005
first generation stand-on scale. The sequence of
operation has been improved also. Just step on the
scale and wait for the three beeps signaling accurate
weight acquisition. The computer controlled readout
provides the simple operating sequence and renders
many new features, including automatic zero, memory
for prior weight recall, printer or data output (RS-232)
capability, etc, The platform is stable, and sits low to
the floor for easy patient access. The handrail has been
redesigned to provide greater support. It has a sloped
design to improve comfort for short and tall patients,
5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702 4

including children. Greater toe clearance has been
provided making it easier to get on and off from the side
without interference. Large rubber tires provide easy,
quiet movement of the scale. The use of disposable
batteries has eliminated the need for a power cord.
Batteries are easily changed without the use of special
tools. Exposed cables and connectors have been
eliminated.
1.20 5102 PHYSICIAN'S OFFICE SCALE
A simple-to-use platform scale that is intended
to be utilized in one location. The 14 x 18 inch platform
is placed on the floor, while the stainless steel digital
readout mounts on the wall and plugs into an electrical
outlet. (Battery powered models available on special
order), This model operates in a similar fashion to the
5002 except that it is designed to remain powered on at
all times. Just step on the scale and wait for the three
beeps signaling accurate weight acquisition.
1.30 5602 PORTABLE SURVEY SCALE
A tugged, simple-to-use portable scale
designed for field survey, visiting nurse home care, and
other requirements where a durable scale must be
easily transportable. The scale is comprised of two
main components: a weighing platform and digital
readout, both of which employ carrying handles.
Weighing capacity is 440 pounds (200 Kilograms). The
compact platform is adequate for most requirements, yet
small enough for convenient travel and storage.
1.40 6002 WHEELCHAIR SCALE
A second generation improvement to the
legendary model 6006 Wheelchair Scale, this scale
contains many of the same improvements as described
in the model 5002 above. The weighing capacity has
been increased to 880 pounds (400 Kilograms). In
order to simplify operation and provide many new
features, the scale's readout has been improved with
the incorporation of a microcomputer. By incorporating
long-lasting disposable batteries and eliminating the
power cord it is now a truly cordless scale. The 24 x 26
inch platform accommodates most wheelchairs in use
today. (For larger chairs, see the model 8702 or model
6202 scale). Large rubber tires are provided for quiet,
easy movement. Exposed cables and connectors have
been eliminated.
The model 6002 also serves as an excellent stand-on
scale when the ramps are folded up. In addition, a chair
can be placed on the platform to serve as a chair scale
when the need arises. The weight of the chair is
removed by simply pressing the zero pushbutton prior to
the patient being seated. Thus the scale is really three
scales in one. The weighing sequence is similar to the
model 5002.
1.50 6702 EXTRA-WIDE WHEELCHAIR SCALE
Same features as the 6002 above, with the
exception of a larger weighing platform (28 x 28 inches)
to accommodate extra-large wheelchairs, electric
wheelchairs, and certain geriatric chairs.
Standard wheelchairs and standing patients are also
easily accommodated.
1.80 6102 BUILTIN FLOOR SCALE
Built-in scales provide the ultimate in
functionality and performance. Large platforms allow
the use of wheelchair, fixed chair, or standing patient
applications. The platforms are flush with the floor and
can even be covered with matching tile, carpet, etc.
Patients with walkers or crutches can use this scale
easily, as can wheelchair-bound patients. It can also
weigh utility carts. A variety of platform sizes are
available, the standard being 32” x 36". Dual platform
models are available for weighing beds, stretchers, etc.
Since the platform is flush-mounted with the floor, the
need for ramps is eliminated, making it much easier to
Toll a wheelchair or cart onto the scale.
Installation of the weighing platform requires a recess in
the floor, Consult SCALE-TRONIX® for architectural
and installation details.
The scale's digital readout is AC line powered and
remains on continuously. The readout is available in
both 100-120 and 200-240 VAC models. A
rechargeable battery pack is incorporated within the
readout to provide operation during power interruptions.
The readout is provided in two basic configurations:
2 5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702

a.) A totally flush-mounted unit that mounts into a cut-
out in the wall This is designed to be directly
connected into the building's electrical supply and scale
platform by use of rigid or flexible conduit.
b.) A surface-mounted unit that is secured to the face of
the wall. Electrical power is provided by a standard line-
cord. Connection from the platform is by means of a
detachable cable.
Either style readout can incorporate an optional built-in
paper ticket printer which provides a printed copy of the
patients weight, along with spaces for the patients
name, room number, time and date. The printer
incorporates a thermal mechanism which is very quiet in
operation and does not require the use of ink ribbons or
cartridges. The printer can be set to print automatically
when the patient's weight is obtained.
1.70 6202 RAMP SCALE
The 6202 ramp scale provides a solution for
semi-portable weighing of stretchers. beds, laundry
carts, wheelchairs, etc. The scale is typically left in one
place, but can easily be moved when required. The
weighing operations and sequence are the same as the
model 6002/6702 wheelchair scales.
180 6502 CHAIR SCALE
A portable scale with a chair attached. The
chair features swing away armrests and a low profile for
ease in seating patients. A built-in foot rest for accurate
weighing
is included. Simply slide it out when in use.
Weight capacity is 400 pounds. Even though the chair
is normally mounted to the scale, it can be removed for
used as a stand-on scale. Large rubber tires are
provided for easy, silent running.
5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702

ASSEMBLY - SET UP
200 GENERAL
This section includes detailed assembly instructions for
each scale. One combination operation/service manual
is supplied with the scale. Additional manuals are
available for a nominal charge. To insure proper and
safe operation of your new scale please follow the
assembly directions carefully.
SCALE-TRONIX® assembles all scales at the factory to
insure proper fit and performance. in some instances
the scales are shipped assembled; however due to size
and shipping restrictions most scales are partially
disassembled. If assembly is required, it can be easily
accomplished with common hand tools. Where special
tools are required they are supplied with the scale. Be
sure to securely tighten all baits and fasteners to insure
a long life for your scale.
Important Note: The components of the scale have
been carefully matched and calibrated at the factory to
insure correct assembly and accurate function. In
situations where multiple scales have been purchased,
DO NOT intermix the various readouts, masts, weighing
platforms, etc.! Doing so may cause errors in the
scale’s performance. Scales that have components
shipped in multiple cartons have that scale's serial
number written on each carton so that the various
components (mast, weighing platform, etc.) can be
placed together and assembled as a unit.
It is wise to save the carton and shipping materials for
future use in case the scale needs to be returned to the
factory for service or upgrades. Carefully inspect all
cartons for shipping damage before unpacking. Contact
the shipping company and SCALE-TRONIX®
immediately if shipping damage is found. All claims
must immediately be made directly with the shipper.
2.10 5002 STAND-ON SCALE
NOTE: in some cases the 5002 scale may be shipped
in an assembled condition thus eliminating the need for
assembly.
Carefully remove all parts from the shipping carton.
Inspect the components for shipping damage. Place the
scale base on a floor or work bench. The interior cable
that connects the readout to the weighing platform will
be tucked up inside the mast. Carefully pull the end
with the connector out of the bottom of the mast. Insert
the mast into the base with the readout facing the black
weighing platform. Be sure the interior cable is routed
properly and not pinched by the mast.
Fasten the mast with the bolts and washers provided.
tt is important to tighten the bolts securely to insure a
stable and solid connection.
Align the plastic connector of the interior cable with its
mate, located on the base near the bottom of the mast.
The connector will only mate one way. If it does not go
together turn it over and try again. Press it together
firmly for a good connection. Be sure to tuck any slack
cable inside the mast so it will not drag on the floor.
2.41 HANDRAIL
Hf you ordered the handrail with the scale install it now
by attaching it to the top of the weighing platform.
Attach the handrail using the %-20 x 96" button head
screws and the hex Allen wrench provided. Three (3)
screws are required for each mounting plate (6 total).
Clearance holes have been provided in the black plastic
cover. Tighten all 6 screws securely to insure a safe
and stable handrail for your patient,
If you did not order the handrail at the time of the
scale's purchase if can be added at a later date as
described below. The handrail is a useful addition to
the scale and helps to provide accurate and safe
operation. The handrail can be readily ordered through
SCALE-TRONIX®.
Note: Early versions of the scale did not provide
clearance holes for the handrail mounting. Before
installing the handrail, remove the plastic cover by lifting
it up and off the aluminum plate. Turn the plastic cover
over and note that the locations for the six (6) holes
have already been located and marked. Simply drill or
cut-out clearance holes in the indicated locations. The
5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702 5

holes can be 5/16 or 3/8 inch diameter. Replace the
plastic cover and install the handrail as described
above.)
2.12 HEIGHT GAUGE ASSEMBLY
If your seale was ordered with a height gauge
follow the installation directions packed with the height
gauge.
2.20 §102 PHYSICIAN'S OFFICE SCALE
Carefully remove all parts from the shipping
carton. Inspect all components for shipping damage.
The only assembly required for this scale is to mount
the flat pack readout to a wall at a convenient reading
height. Preferably pick a location near an electrical
receptacle. Detach the mounting bracket from the
readout by removing the two top screws on both sides
of the readout. A %" Allen hex wrench is supplied for
this purpose. The method of fastening will vary
according to the type of wall. Mount the bracket to the
wall with appropriate mounting hardware such as dry-
wall fasteners, “molly-bolts”, screws, etc. (not included
with scale). Reassemble the readout to the bracket by
re-installing the two previously removed screws.
Place the platform on the floor in the desired position.
NOTE: The platform should be six to ten inches away
from the wall for proper operation (so the patient's body
will not touch the wall). Connect the transducer cable
between the platform and the readout. Insert the power
cord's plug into an electrical outlet.
Handrails are not available for this scale.
2.30 5602 PORTABLE SURVEY SCALE
Carefully remove all parts from the shipping
carton. Inspect all components for shipping damage.
This scale is shipped fully-assembled from the factory.
Simply connect the transducer cable between the
platform and readout. For proper use, the platform
should be placed on the floor, and the readout can be
held or placed on a table.
Handrails are not available for this scale.
240 6002 WHEELCHAIR SCALE
NOTE: In some cases the 6002 scale may be shipped
in an assembled condition thus eliminating the need for
assembly.
Carefully remove all parts from the shipping
carton. Inspect the components for shipping damage.
Place the scale base on a floor or work bench. The
interior cable that connects the readout to the weighing
platform will be tucked up inside the mast. Carefully pull
the end with the connector out of the bottom of the
mast. Insert the mast into the base with the readout
facing the black weighing platform. Be sure the interior
cable is routed properly and not pinched by the mast.
Fasten the mast with the bolts and washers provided.
It is important to tighten the bolts securely to insure a
stable and solid connection.
Align the plastic connector of the interior cable with its
mate, located on the base near the bottom of the mast.
The connector will only mate one way. If it does not go
together turn it over and try again. Press it together
firmly for a good connection. Be sure to tuck any slack
cable inside the mast so it will not drag on the floor.
241 WEIGHING DECK MOUNTING
The weighing deck is mounted to the scale by
four (4) special flat head screws. The deck must be
positioned so that the two sets of holes (under the flaps)
ate closest to the mast. These holes are used for
mounting the handrail. Line the weighing deck up with
the mounting holes in the aluminum plate. Install four
Y” flat head screws (supplied) through the deck.
Tighten the mounting screws securely with the hex Alten
wrench provided.
2.42 HANDRAIL
If you have ordered the handrail for the scale
install it now by fastening it to the weighing deck. The
mounting feet of the 6002 handrail are attached to the
underside of the weighing deck with the hardware
provided. Each foot of the handrail attaches to the
platform with the two flat head screws and special
locking nuts provided. It is important to tighten the
screws and nuts securely.
If you did not order the handrail at the time of the
6 5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702

scale's purchase it can be added at a later date. The
handrail is a useful addition to the scale and helps to
provide accurate and safe operation. The handrail can
be readily ordered through SCALE-TRONIX®.
2.43 HEIGHT GAUGE ASSEMBLY
If your scale was ordered with a height gauge
follow the installation directions packed with it.
2.50 6702 EXTRA WIDE WHEELCHAIR SCALE
The assembly of this scale uses the same
procedure as the model 6002 above. The platform is
larger than the 6002. The same handrail is used with
either scale.
2.60 6102 BUILT IN FLOOR SCALE
Carefully remove all parts from the shipping
carton. Inspect all components for shipping damage.
This scale is normally installed by SCALE-TRONIX®
service personnel to insure proper assembly and
operation. A pit in the fleor should have been previously
prepared according to the plans supplied by SCALE-
TRONIX®. This pit can be formed when the floor is
poured, or it can be cut into an existing floor. A "rough-
in" frame, supplied with the model 6102, is then
cemented into the floors pit.
Once the rough-in frame installation is complete, and
the scale's readout is mounted (ses installation
instructions included with the readout), the weighing
frame can be positioned into the rough-in frame. First
remove the thread protectors from the (4) 5/16”-18 bolts
which protrude up from the rough-in frame. Place the
weighing frame into the rough-in frame, aligning it over
the four (4) bolts. Fasten the weighing frame in place
using the four (4) 5/16”-18 nuts provided and tighten
securely.
(Note: Some models may employ a different installation
technique for mounting the weighing platform to the
roughán frame. Follow any included instructions
supplied with the rough-in frame and weighing platform.)
"Fish" the interconnecting transducer cable through the
conduit from the readout down to the base (a “tracer”
string is normally “pre-loaded” within the flexible conduit
for pulling the cable through the conduit). Connect the
transducer cable to the terminal block in the weighing
frame making sure to observe the correct color coding
as noted on the label next to the terminal strip. On
flush-mounted readouts attach the individual conductors
of the cable to the readout's internal terminal block.
Surface mounted readouts have a socket on the cabinet
that mates with the pre-wired connector on the cable
assembly.
A dual version of the model 6102 is also available which
incorporates two weighing platforms. An additional
flexible conduit is included to connect the two weighing
platforms together. Follow the specific instructions
included with the scale for interconnecting the platforms
and the readout.
Re-attach the top deck to the weighing frame using the
eight (8) 10-24 flat head Allen screws and the Allen hex
wrench provided. Tighten securely. Place the optional
gray plastic deck cover on top of the deck unless an
alternate covering material is to be used. If a floor
covering is to be affixed to the top deck make sure
there is a 1/4" gap on all four sides to prevent binding
and allow free movement of the weighing mechanism.
This will insure accurate performance.
No handrails are available for this scale.
2.70 6202 RAMP SCALE
Carefully remove ali parts from the shipping
carton. Inspect all components for shipping damage.
Place the scale base assembly on the floor. Connect
the transducer cable between the scale base and the
readout. insert the plug of the power cord into an
electrical receptacle. The operation of the scale is
similar to the 6002 and 6702 wheelchair scales.
No handrails are available for this scale.
2.80 6502 CHAIR SCALE
NOTE: In some cases the 6502 scale may be shipped
in an assembled condition thus eliminating the need for
assembly.
Carefully remove all paris from the shipping
5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702 7

carton. Inspect the components for shipping damage.
Place the scale base on a floor or work bench. The
interior cable that connects the readout to the weighing
platform will be tucked up inside the mast. Carefully pull
the end with the connector out of the bottom of the
mast, Insert the mast into the base with the readout
facing the biack weighing platform. Be sure the interior
cable is routed properly and not pinched by the mast.
Fasten the mast with the bolts and washers provided.
It is important to tighten the bolts securely to insure a
stable and solid connection.
Align the plastic connector of the interior cable with its
mate, located on the base near the bottom af the mast.
The connector will only mate one way. If it does not go
together turn it over and try again. Press it together
firmly for a good connection. Be sure to tuck any slack
cable inside the mast so it will not drag on the floor.
The chair is inserted into the mounting cups (chair
facing away from readout) and secured by the four (4)
wing bolts.
No handrails are available for this scale.
2.90 POWER SUPPLY / CHARGER /
RECHARGEABLE BATTERY OPTION
An option is available to provide AC line power
operation for SCALE-TRONIX® models 5002 / 6002 /
6502 / 6702. This module mounts in the rear of the
readout cabinet, in place of the access panel. Note:
Because the internal printer option also uses this
mounting method, the power supply / (charger) /
(rechargeable battery) is not available for those scales
equipped with the internal printer.
Two versions are available: An AC power supply only,
which eliminates the use of disposable dry cells; and a
power supply / charger with rechargeable nickel-
cadmium battery pack, which allows corded or cordless
operation. Normally supplied for operation at 120 VAC,
240 VAC operation is also available.
Both versions are available as either a factory installed
option at the time of scale purchase, or as a “field add-
on" modification kit that can be installed by the customer
with minimum effort. Refer to the instructions included
with the power supply when installing it.
Call the factory (see inside front cover) for availability,
pricing, and ordering information.
8 5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702

OPERATION OF SCALES
3.00 GENERAL
The SCALE-TRONIX® second generation
scales described in this manual all operate in a similar
fashion. The scales readout utilizes computer
controlled digital systems to provide such features as
pushbutton zero, motion detection, units conversion,
memory for recalling previous weights, printer and
computer data output options, etc.
The portable scales are truly cordless. Power cords
have been eliminated where possible with no
compromise on battery life - typically in excess of
10,000 weighings for most units.
The typical operating procedure is very simple:
1. With scale empty, turn it on by pressing the
"ON" pushbutton - (ONE BEEP)
2. Wait for automatic zero - (TWO BEEPS).
3. Place patient on scale and wait for the true
weight fo be displayed - (THREE BEEPS).
That is all there is to it - simple as 1,2,3! The scale will
even shut itself off after 45 seconds of inactivity to
conserve batteries, but will allow successive weighing
of several patients. The time delay before shutting off
is selectable by the operator through the “set-up”
programming feature (see section 3.70) and can be
changed if desired.
The weight can be displayed in either pounds or
kilograms by pressing the appropriate pushbutton. The
scale will "remember" the selected weight units and turn
on in these units. By use of the "set-up" feature the
operator can program the scale to display only in a
particular unit,
If, after the weight is displayed (three beeps), you
suspect that the weight might be erroneous due to
someone touching the scale or patient, simply press
“RE WEIGH" and the scale will calculate the weight
again, beep three times, and re-display. The scale
indicates motion by a series of dashes during the time
that the computer is determining the weight.
It's no problem If the patient exits the scale and you
forgot the weight! Simply press the "RE CALL"
pushbutton. The scale will display the last weight
measured, snd indicate so by blinking the "PRIOR
WEIGHT" light for a few seconds.
Note: Ifthe patient will be operating the scale to obtain
self-weights, be sure to instruct them not to continue
to press on the readouťs pushbuttons while the
weighing process is taking place! Press the "ON"
pushbutton once, remove fingers from the control panel,
and stand clear to wait for the accurate weight. (On a
scale as sensitive as these, the force of continuing to
press on the contro! panel while being weighed will be
reflected as an error in the weight reading!)
On scales equipped with a handrail, the patient may
hold on to the handrail to provide additional support. It
is not permissible, however, to hold or touch other parts
ofthe scale such as the readout, black steering handle,
etc. (That is like leaning on the bathroom sink when
weighing yourself at home; good for the ego, but
clinically not acceptable! )
Get in the habit of using the audible beeps to assist you
in the simple and proper operation of the scales. The
beeper can easily be disabled by means of the set-up
programming feature in those instances where its use
isn't desirable.
3.10 POWER ON
Press the “ON" pushbutton located in the upper
right-hand corner of the control panel to switch the scale
on. The scale will beep once and then show "888888"
with all annunciators lit as a test of the readout's
display, then display the scale's model number
(example: "50029. During this time a number of self-
tests are performed by the readout's internal electronics.
if no other actions are performed the scale will
automatically shut off after about 45 seconds. if
additional operating time is required, simply press the
5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702 9

“ON" switch to momentarily reset the readout's internal
timer. To turn the scale "off" before the automatic timer
does, press and hold the scale's "ON" pushbutton for a
few seconds.
In the case of the model 5102 physician's office scale,
the readout is left powered-on at all times, and will
display "0.0" when the scale is empty. The model 6102
runs continuously on AC power, but because it employs
an internal back-up battery for power outages, will time
out after two (2) minutes during power outages.
3.20 ZEROING
It is a good technique to always turn the scale
on “empty” to verify the proper zero value of the scale.
The scale will then automatically establish a new "zero"
value, in the case of the model 5002 stand-on scale,
and the model 6502 chair scale, it is possible to stand
or sit on the scale first and then tum İt on. In this
instance the scale knows that it cannot establish "zero"
because a patient is already present, so it simply
displays the weight using the previous "Zero" value.
This cannot be done with the models 6002 and 6702
wheelchair scales or model 6202 ramp scale since the
ramps could be either in the up or down position.
These scales must be set to "zero" first by turning it on
empty and allowing the automatic zeroing feature to
operate. This can be done with ramps up or down. If
the patient gets on the scale before turning it on, the
patient will receive the prompt "OFF SCALE PLEASE
=". Simply remove the patient from the scale, and wait
for it to automatically go to zero (scale displays "0.0"
and beeps twice); or press the "ZERO" pushbutton, wait
for the two beeps, and continue weighing.
Operating tip: By use of the "ZERO" pushbutton it is
possible to weigh babies and small children who would
not otherwise be able to stand on the weighing deck,
Have the nurse or mother stand on the scale and
remain stationary while the "ZERO" pushbutton is
pressed. Immediately after the scale obtains “zero” (two
beeps and displays "0.0"), have the same nurse or
mother hold the baby or small child while on the scale.
The weight of the nurse or mother will automatically be
subtracted from the total and the true weight of the baby
will be displayed. While not as accurate as using a
pediatric scale, a reasonably close weight will be
obtained. A minimum weight of five (5) pounds is
required on early versions of these scales; newer
models will weigh a minimum of one (1) pound.
The same type of zeroing technique can be used when
placing a chair on the deck of the models
6002/6102/6702 wheelchair scales. Place the chair on
the deck and press the "ZERO" pushbutton. The scale
will beep two (2) times, then display "0.0". The weight
of the chair is now automatically subtracted from the
total, and a patient sitting in the chair will be weighed
correctly. To continue with normal patient weighing
after employing either technique, simply press the
"ZERO" pushbutton with the weighing deck empty.
3.30 OBTAINING WEIGHT
Once the patient stands on the scale it will
display a series of dashes indicating it is computing the
weight. During this time the patient should remain
motionless. If the scale is equipped with a handrail the
patient may grasp it to help in remaining stationary. The
black steering handle on the top of the readout should
not be touched during the weighing process.
Once the weight is obtained the scale will beep three
times and display the patients weight.
3.31 WEIGHT UNITS
The weight may be displayed in either pounds
{LB) or kilograms (KG) by selecting the appropriate front
panel pushbutton. An annunciator on the front panel of
the readout will illuminate fo show the currently selected
units. The weight units may be selected at any time
during the weighing process.
The scale will remember the selected units when it is
turned off. Upon powering it up it will automatically
default to this previously selected unit.
By use of the set-up feature (see section 3.70) the scale
can be programmed to display in either pounds only or
kilograms only. It can also be programmed to display in
resolutions other than 0.1 kilogram/pound {again see
section 3.70).
3.32 REWEIGH
The “RE WEIGH" pushbutton provides a
convenient method of re-obtaining the patient weight if
10 5002, 5102, 5602, 6002, 6102, 6202, 8502, 6702

you suspect it is in error. This may happen if the
patient was touching something other than the scale's
handrail, or the patient was in some other way interfered
with. Pressing the "RE WEIGH” pushbutton will cause
the scale to display a series of dashed lines, then beep
three (3) times and display the weight.
3.33 RECALL
The “RE CALL" pushbutton is used to display
the previous patient's weight. After the patient steps off
the scale and the display returns fo "0.0", the weight
reading is automatically entered in the scale's non-
volatile memory.
This stored weight can be displayed on demand by
pressing the "RE CALL" pushbutton at any time. The
weight will be displayed along with a flashing "PRIOR
WEIGHT" annunciator as long as the "RE CALL"
pushbutton is held; a quick press of the pushbutton will
display it for several seconds.
This is a useful feature if the operator has forgotten to
record the patient's weight or was otherwise occupied
with the patient and prevented from recording it.
On newer versions of these scales (software versions
2.00 or higher) the weighi can be displayed with the
scale turned "off" by simply pressing the "RE CALL"
pushbutton. The scale will automatically turn on, display
the flashing "PRIOR WEIGHT" annunciator along with
the weight value, then switch off several seconds after
the "RE CALL" pushbutton is pressed. Earlier versions
of the scale require that the scale first be powered “on".
3.34 MODEL 6502 FOOTREST / ARMREST
The model 6502 chair scale includes a slide-out
footrest to insure accurate weighing. Once the patient
is seated in the chair the footrest can be extended to
provide a convenient place to rest their feet. The
patients feet should not touch the floor during the
weighing process as this will affect the weight reading's
accuracy. When finished weighing the patient the
footrest can be returned to its retracted position to allow
easier patient exit.
The armrests of the model 6502 foki-down to allow easy
patient access to the chair. To fold the armrest
squeeze the latch lever and press the armrest down.
To restore it to its original position pull up on the arm
rest until it clicks into position.
340 ERROR MESSAGES: "bAttrY”, "O.LOAd",
"CABLE", "OFF SCALE PLEASE --", "E-
FAIL", "r.FAIL“
The internal microcomputer contained in the
readout constantiy monitors the scale's operation and
uses the display to indicate error conditions when they
arise. An explanation of these messages is given
below:
a.) "bAttry” : Indicates the battery has become
depleted to the point that it can no longer
operate the scale. Replace the battery to
continue operation,
b.) "O-LOAď : Shows that the scale platform's
weighing capacity has been exceeded. Refer to
the inside front cover specifications for
maximum capacity.
с.) "CABLE": Displays that the transducer
signal is well in excess of its maximum value.
This is usually caused by the transducer cable
being disconnected. Check the cable
connection between the readout and the
weighing platform. On scales with a mast
(5002, 6002, etc.) check the connection at the
base of the mast.
3.) "OFF SCALE PLEASE --" ; Ramp equipped
scales (6002, 6702, etc.) require that a "zero"
value be established before the patient enters
the weighing platform area. Remove the patient
from the weighing platform and allow the scale
to obtain “zero”.
e) "E-FAIL", "rFAIL” : Shows that a memory
failure has occurred in the internal
microcomputers memory. Requires service of
the scale.
3.50 OPTIONAL PRINTER
On certain model scales a digital paper tape
printer can be supplied. The printer provides a
convenient printed record of the weight. Space is
provided on the tape printout to write in the patients
5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702 11

name or ID, room number, and date, if desired. See the
sample weight ticket printed below:
SCALE-TRONIX
MODEL 6102
WEIGHT: 75.3 KILOGRAMS
The printer will only print a valid weight. It will not print
when the scale is reading "0.0" or is empty. tt will print
the prior weight if that feature is currently activated.
Press the front panel “PRINT” pushbutton to activate the
printer. A single beep should be heard, then the printer
will power-up and begin printing. A series of four (4)
short beeps signifies that an invalid print request was
made {weight not displayed on scale; weight ticket
already being printed). A series of four (4) long beeps
signals an internal problem with the printer (such as a
jammed print head or disconnected cable). No provision
is made to detect an out of paper condition.
Printing may occur after the patient has left the scale.
To print the previous patient's weight press the "RE
CALL" pushbutton followed by the "PRINT" pushbutton.
The "PRIOR WEIGHT" annunciator will flash, and the
scale's readout will display the previous patient's weight
for a short time while the printing continues. The scale
will not automatically shut-off until the printing is
completed.
Various set-up options are available for the printer.
These include "auto" print (weight is printed
automatically on display), print only in selected units
regardless of front panel display, etc. See the section
pertaining to "SET-UP", section 3.70, for further
information.
The printer mounts to the rear of the digital readout of
some portable scales (5002, 6002, 6502, 6702). An
internally mounted printer is available for the model
5102 and 8102 scales.
“Printer Mechanism
PRINTER PAPER LOADING DIAGRAM
The printer is a modern thermal type using a specially
coated paper. The paper should be 2%" wide by
approximately 174" in diameter. One roll of paper will
produce approximately 525 weight tickets. No ink
ribbons are required. Additional rolls of paper can be
purchased at many stationary supply stores or directly
from SCALE-TRONIX®. Order part number 23709 /
390043).
Paper is loaded through a removable access door on
most scale models. Be sure to install the paper as
shown in the illustration.
3.51 COMPUTER DATA OUTPUT
In lieu of the internal printer option a computer data
output (RS-232 serial format) is available as an option
on most scales. This output can be used to send the
patient weight data to a data collection system, personal
computer, or external printer. A separate addendum is
available which describes in detail the operation of this
feature. Consult the factory for further details.
3.60 BATTERY REPLACEMENT
Heavy duty alkaline-type cells should be used in your
SCALE-TRONIX® portable scale, These are commonly
known as "Duracell type MN1300". A total of six (6) "О"
size cells (ANSI/NEDA type 13A, IEC type LR20) are
installed in a plastic battery holder contained within the
readout cabinet. Use of less powerful carbon-zinc
batteries is not recommended.
Typical battery life is in excess of one year depending
on usage. Excessive use of the printer will reduce
battery life somewhat. When the battery voltage drops
12 5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702

below a preset level the "LO BATT™ annunciator light
will blink signalling the operator that the battery is
wearing down. This is a preliminary warming.
Immediate action is not required as there are séveral
weighings left in the battery when the "LO BATT”
warning is activated. The batteries should be replaced
within a few days of this warning.
A second low battery condition is detected when the
voltage fs inadequate to accurately operate the scale.
At this point the "LO BATT” annunciator will continue to
blink, and the scale will display "bAttrý“ on the weight
display accompanied by a series of four long beeps.
This is done to eliminate the possibility of displaying
erroneous weights by preventing the scale from being
used. Ifthe batteries are replaced when the "LO BATT"
signal activates this additional "low-low battery” signal
will never be seen.
The batteries for the models 5002, 6002, 6502, and
6702 are located under an access door on the rear of
the mast. Two "quarter-turn" fasteners hold the cover in
place. Use a dime coin or screwdriver to rotate the
fastener a quarter of a turn. Replace all six (6) of the
cells with fresh alkaline heavy-duty batteries. Be sure
to observe proper polarity of the cells as they are
installed. Replace the cover and fasten securely with
the quarter-turn fastener using a dime or screwdriver.
Depending on the readout configuration the batteries for
the model 5662 may be accessed by removing a cover
or the top of the readout cabinet. These may be size
"D"
or "C” alkaline cells.
The date of battery replacement should be noted on the
battery replacement label provided on the underside of
the cover. In situations where the scale is not used
extensively the batteries should be replaced annually
just as a precaution.
The model 6162 built-in scale employs a rechargeable
nickel-cadmium battery to power the internal printer and
provide operation during power outages. This battery
should last several years in normal operation but will
eventually deteriorate due to age. The replacement
battery is SCALE-TRONIX® part number 360007.
To replace the 6102's battery unplug the readout or tum
off the circuit breaker providing power to the scale.
Press and hold the “ON” pushbutton to switch the scale
"off. Remove the front panel of the readout to expose
the battery. Unplug the battery's white connector from
the power supply board by pulling straight up. Remove
the old battery from its holder (it may be taped in place)
and install the new battery. Insert the new battery's
connector on the exposed power supply pins. Re-attach
the front panel and restore operating power. Turn the
scale back on by pressing the “ON” pushbutton and
observe that the front panel “CHARGE” indicator is lit.
3.70 SPECIAL PROGRAMMING FEATURES
Your SCALE-TRONIX® second generation weighing
scale incorporates a unique feature that lets you
"customize" the scale to best suit your needs. This “set-
up" mode allows the characteristics of the scale to
match your particular requirements. liems that can be
selected include the automatic shut-off time, weight
resolution, weighing units, automatic printing, etc.
3.71 ENTERING THE "SET-UP" MODE
To enter the “set-up” mode start with the scale turned
off. Note the small "ST" logo ("ST") located directly
above the "RE CALL" pushbutton on the front panel of
the readout. This "ST" actually contains a small hidden
pushbutton. Press and hold this “ST" pushbutton on the
front panel while turning the power on with the “ON”
pushbutton. (Use the rocker power switch in place of
the "ON" button on the models 5102 and 6202.) Once
the scale turns on release the "ST“ pushbutton, then
press and release it 5 more times. The scale will
display "SE*UP" and produce a series of four long
beeps. “Set-up" mode has now been entered.
The "RE CALL" pushbutton is used to select the
particular option value. Once this value is selected the
scale can be advanced to the next option by again
pressing the "ST pushbutton or it can be shut-off by
pressing and holding the "ON" pushbutton. (Use the
rocker power switch in place of the "ON" button on the
models 5102 and 6202.) When the scale is turned back
on, normal scale operation will then resume using the
newly programmed features.
3.72 SETTING THE OPTIONS
First enter the "SET-UP" mode as explained above,
4) Press the "ST" pushbutton. The scale will
display “SOFf (software version). Press the "ST"
5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702 13

pushbutton again. The software version will be displayed
(ei. "YU 1.42.2). This is provided as a reference aid in
determining which features are contained within the
software.
2) Press the “ST’ pushbutton. The scale will
display "dAtE” (date). Again press the “ST” pushbutton.
The release date of the software will be displayed. A
display of "03.26.96" would correspond to March 26th,
1996. This is provided as a reference aid in determining
which features are contained within the software.
3) Press the "ST" pushbutton. The scale will
display "SCALE". Press the "ST" pushbutton again; the
model number of the scale will be displayed (i.e:
"5002", "6002", etc.). This is provided as a reference
aid to help with customer trouble-shooting and is set at
the factory.
4) Press the "ST" pushbutton. If the scale’s serial
number has been programmed at the factory the scale
will display "SEr no." (serial number). Press the "ST"
pushbutton again; the serial number of the scale will be
displayed (e.i. "10563"). This is provided as a reference
aid to help with customer trouble-shooting and is set at
the factory. Newer versions of the software (10/07/95
or later) skip these displays if the serial number has not
been entered at the factory.
5) Press the “ST” pushbutton. The scale will
display "AutOFF" (automatic shut-off time). Again press
the “ST” pushbutton. The currently selected number of
seconds before the scale shuts-off will be displayed.
This is normally set at the factory to be 45 seconds (120
seconds for the model 6102). lt can be altered in 15
second increments fram 15 seconds to 180 seconds (3
minutes). An additional "Conf (continuous) option is
provided for some special applications; this prevents the
scale from automatically shutting-off; the scale can then
only be turned off by pressing and holding the "ON"
pushbutton. Use of the continuous mode of operation
is not recommended since it will discharge the battery.
Portable scales equipped with the optional power supply
(see section 2.90) may have this option set to
continuous since there is no problem with battery
discharge.
Ta alter the length of the automatic shut-off time press
the "RE CALL" pushbutton. The automatic shut-off time
will advance through the available options. Stop at the
desired time interval.
Line powered scales which remain on continuously,
such as the model §102 physician's office scale and the
mode! 6202 ramp scale, should display "AC ОРГ,
indicating "AC operation”. This is programmed at the
factory and cannot be changed in the "set-up" mode.
6} Press the "ST" pushbutton. Newer versions of
the scale will display "AC con" (AC power continuous
operation), Older versions of the scale (software
versions below 2.00) will not provide this option, skip to
paragraph 7 below. This feature is used in the model
6102 built-in scale to cause the scale to remain “on” as
long as AC power is provided (automatic shut-off will
not occur).
Pressing the "ST" pushbutton again will show this option
selected as "On" or "OFF". To alter the selection press
the "RE CALL” pushbutton. This option should remain
set at "OFF" except for the model 6102 built-in scale.
7) Press the "ST" pushbutton. The scale will
display "YES" (resolution of weight), Press the "ST"
pushbutton again. The "POUNDS" and "KILOGRAMS"
annunciators will light and two numbers will be
displayed. These numbers represent the selected
resolution of the scale. Pressing the "RE CALL"
pushbutton will allow the following selections:
0.1 pounds / 0.05 kilograms
0.1 pounds / 0.1 kilograms
0.2 pounds / 0.1 kilograms
0.5 pounds / 0.2 kilograms
1,0 pounds / 0.5 kilograms
Normal factory selection is 0.1 pounds / 0.1 kilograms.
Since the scale uses the selected resolution to
determine weight lock-in, use of a larger resolution will
reduce waiting time, particularly for unsteady patients.
8) Press the "ST pushbutton, The scale will
display "UnitS" (weight units) Press the "ST"
pushbutton again. The "POUNDS" and “KILOGRAMS”
annunciators will light according to the selected weight
units. Option choices of "POUNDS" and
"KILOGRAMS", "KILOGRAMS" only and "POUNDS"
only may be selected by use of the "RE CALL"
pushbutton. If a particular weight unit is disabled, its
front panel pushbutton will no longer operate and may
be covered with a strip of tape to prevent confusion.
9) Press the “ST” pushbutton. The scale will
14 $002, 5102, 5602, 6002, 6102, 6202, 6502, 6702

display “BEEPEr (audio beeper). Press the "ST"
pushbutton again. "On" or “OFF” will be displayed.
This may be changed by pressing the “RE CALL"
pushbutton. Setting this option to "OFF" will eliminate
the audible signal that occurs when a front pane!
pushbutton is pressed or a weight is locked in.
10) Press the "ST" pushbutton. If equipped at the
factory with the optional data port or built-in printer the
scale will display "rS-232", indicating the start of the
serial data port options. If this option is not provided
skip to paragraph 14 below. The optional serial data
port on the SCALE-TRONIX® second generation scales
is used to send weight data to the built-in printer (if so
equipped) or an external data collection device, such as
a personal computer.
11) Press the "ST" pushbutton. The scale will
display "OutPuť. Again press the "ST" pushbutton.
The display will show the currently selected data port
output option.
NOTE:For operation of the internal built-in printer this
must be set at "StPrt1" (SCALE-TRONIX® printer #1).
Setting the "OutPuf' option to one of the other printer
selections can cause erroneous operation of the scale
and/or printer.
If the optional data port is used for data transmission to
a computer or other device ("OutPuť set to "dAtA"), or
to a an external printer "OutPuť set to IMP.24, IMP-56,
С13110, ас.) refer to the more detailed addendum
included with your scale which explains setting up the
various data port communication parameters (baud rate,
parity, etc.).
This option may also be set to "OFF", which will disable
the internal printer. If the printer is disabled, the front
pane! "PRINT" pushbutton will no longer operate and
may be covered with a strip of tape to prevent
confusion.
12) Press the "ST" pushbutton. The scale will
display "PrtUnt' (print units). Again press the "ST"
pushbutton, the "POUNDS" and "KILOGRAMS"
annunciators will illuminate to indicate which print units
are selected. By pressing the "RE CALL” pushbutton
the following selections can be made:
a.) "POUNDS" and "KILOGRAMS" lit: Print
output is whatever unit is selected on the
scale's front panel. This is the normal default
setting.
b.) "KILOGRAMS" lit: Prints weight only in
Kilograms regardiess of scale's present front
panel weighing units selection.
e.) "POUNDS" Hit. Prints weight only in Pounds
regardless of scale's present front panel
weighing units selection.
Note: The printing mode is independent of the weight
units option mode. As an example, if the weighing units
are selected as "POUNDS" only, the print units can be
selected to print in "KILOGRAMS" only.
13) Press the "ST" pushbutton. The scale will
display "PrtOPt’ (print option). By pressing the "RE
CALL" pushbutton the following selections can be
made:
a.) "PniPrť (Panel Print): Weight is printed
when the front panel "PRINT" pushbutton is
pressed. This is the normal factory (default)
setting.
b) “AufPrf' (Auto Print): Weight is
automatically printed when weight “lock-in”
occurs. (Note: The front panel "PRINT"
pushbutton is still active and may be pressed to
obtain an additional weight ticket.)
14.) Press the "ST" pushbutton. The scale will
display "PC brd” (printed circuit board). Pressing the
"ST" pushbutton again will display the model number of
the printed circuit board (i.e. "23005°). Another press of
the "S7™ pushbutton will show the revision level of the
printed circuit fe. "01. These are provided for
informational trouble-shooting purposes and cannot be
changed in set-up mode.
15) Pressing the "ST" pushbutton one last time
returns the scale to the introductory "SEt-UP" mode.
The scale may be turned off by pressing and holding the
“ON” pushbutton (use the power rocker switch for the
models 5102 and 6202), or the option list may be
run-through another time. If left alone the scale will
automatically shut-off after three (3) minutes (except
models 5102 and 6202). (The selected automatic shut-
off time is temporarily lengthened when the scale is
operating in the special "SEt-UP" mode.)
§002, 5102, 5602, 6002, 6102, 6202, 6502, 6702 15

3.80 POWER SUPPLY / CHARGER OPTION
A power supply / charger option is available
which eliminates the need for disposable dry cells to
operate the scale. This option may be ordered at the
time of the scale's purchase or added later (see section
2.90). It is available as a power supply only or as a
combination power supply / charger / rechargeable
battery. The addition of the charger and rechargeable
battery pack allows portable, cordless operation.
The battery is charged automatically any time the scale
is plugged-in, as indicated by the illuminated front panel
"CHARGE" annunciator. A fully discharged battery
requires approximately 8 - 12 hours to completely
recharge. During this period the scale may also be
used for patient weighing. Since there is no danger of
over-charging the battery the scale may be left plugged-
in continuously,
To obtain optimum performance, annual replacement of
the nickel-cadmium battery pack is recommended. It is
SCALE-TRONIX® part number 360002 / 20009.
3.80 STORAGE
The portable scales should be stored in a safe
place such as equipment storage room, closet, ею. К
is no longer necessary to store the scales near an
electrical outlet as in the past for recharging of the
batteries. Try not to leave the scales in a busy hallway
where somebody could trip on them or run into them
with a food cart, X-ray, etc.
3.100 MAINTENANCE
Contact the factory for electronic maintenance
or operating problems. Most problems can be quickly
diagnosed on the phone. Any repairs or replacements
can be handled quickly at a reasonable cost.
To keep your scale in top working order the following
preventative maintenance measures apply:
1) Check calibration annually or as required.
2) Inspect weighing platform for loose mounting
components.
3.) Check weighing platform's cable and connector
for integrity.
4) Inspect line cord (if supplied) for abrasion or
other signs of wear.
5) De not expose scale to excessive water or
moisture.
6.) Do not store the scale where heavy objects
may be set on it
3.110 FACTORY RETURNS
In returning any components to the factory, please use
the original shipping containers designed for this
purpose,
You must call our factory service department at 630-
653-3377 for a proper RMA (Retumed Material
Authorization) number and shipping instructions and
special address. You will be advised exactly what part
to return. We rarely need to have the complete scale
returned. This will save you time and expense.
RMA NUMBERS MUST BE OBTAINED FROM THE
FACTORY PRIOR TO RETURNING ANY ITEM.
When calling the factory for service assistance, the
serial number and model number of the scale must be
mentioned at the beginning of the call to allow our
service staff to quickly access the manufacturing
records, calibration data, service records, and other
pertinent information concerning that particular scale.
(These numbers can be found on the data label
attached to the weighing platform and the readout.)
DO NOT SHIP ANYTHING TO THE WHITE PLAINS,
NEW YORK ADDRESS. This will only cause delays
as the items will be returned to you.
RMA NUMBERS MUST BE OBTAINED FROM THE
FACTORY PRIOR TO RETURNING ANY ITEM.
CAUTION:
THE SCALES ARE NOT TO BE USED FOR
TRANSPORTING PATIENTS OR ITEMS. . DAMAGE
TO THE SCALE OR PATIENT INJURY COULD
RESULT AS WELL AS VOIDING ALL WARRANTIES.
16 5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702

Readout electronics consist of the following:
1. Differential signal amplification.
2. Additional amplification and signal filtering.
3. Analog-to-Digital (A/D) converter and Clock
circuit.
4. Battery and support circuitry, voltage
regulators, power supplies, etc.
5. Microcomputer and support circuitry.
6. Display board.
7. Printer assembly.
8. Printer interface board.
9. Printer controller board,
4.21 DIFFERENTIAL SIGNAL AMPLIFICATION
The weight dependent output signal produced by the
load cell transducers in the weighing frame is a
“differential signal", meaning it is the voltage
difference between the "+ Signal” and "- Signal"
leads. Integrated circuit U4, an instrumentation
amplifier, is used to interface to this differential signal
and amplify it.
The output signal from the load cells is applied to the
protection network cansisting of diodes
CRA4/CRS/CR6/CR7. These diodes prevent
destructive overvoltages caused by static discharges
from damaging U4, A high frequency filter, formed by
L1/i2/C9/C10 couples the weight signal to the input
of U4. In U4 the differential signal is amplified by a
factor of 100, and converted to a "ground-referenced"
voltage for further processing.
Capacitors C16/C17/C24 provide local bypassing of
the power supplies used by instrumentation amplifier
U4. Capacitor C18 furnishes compensation of U4 by
reducing amplification at higher frequencies.
4.22 ADDITIONAL AMPLIFICATION AND
SIGNAL FILTERING
Components for an optional second gain stage may
be added on the printed circuit board. If included
operational amplifier US is used to provide additional
gain and signal filtering. U5, together with capacitors.
C14/C15 and resistors R17/R18, forms an active low-
pass filter. This helps to remove fluctuations in the
weight signal caused by movement of the patient on
the scale. US, like U4, is “chopper-stabilized" to
correct internal offset and drift errors.
Resistors R24/R25 (optional) are used to increase
gain; resistors R26/R27 (optional) are used for gain
reduction. An additional low-pass filter stage is
furnished by resistor R34 and capacitor C23.
4.23 ANALOG-TO-DIGITAL (A/D) CONVERSION
Integrated circuit U6 is the analog-to-digital converter.
Included on this integrated circuit are auto-zero
functions, auto-polarity, and the digital and analog
functions necessary to perform dual slope integration
conversion to 20,000 counts (4% digits}. The weight
signal voltage is applied to the analog input (pin 10) of
Us.
À reference voltage for the conversion is applied to pin
2 of U6. The reference voltage, nominally 1 Volt, is
derived from the load cell transducer excitation
voltage, by the divider network consisting of resistors
R29, R30, and potentiometer P1. Adjusting P1 sets
the "span" or weight calibration of the scale.
The system clock, applied at pin 22 of U6, is used to
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AID CONVERTER TIMING DIAGRAM
precisely time and control the phases of the dual slope
conversion process. Refer to the converter timing
diagram when reading the following description.
18 5002, 5102, 5602, 6002, 6102, 6202, 6502, 6702