TScale M503 Series User manual

Weighing Indicator
M503
Chair scales

M503 Series chair Scales Service Manual (3.09)
- 1 -
CONTENTS
1. PRECAUTIONS……………………………………………………………..2
2. INTRODUCTION……………………………………………………………3
3. SPECIFICATIONS……………………………………………………….....4
3.1Specifications………………………………………………………………...4
3.2 Load Cell Specification...............................................................…...5
4. INSTALLATION……….…………………………………………………….6
5. DESCRIPTION……….....................................................................8
6. OPERATION………………………………………………………………..10
1. Power ON/OFF…………………………………………………………10
2. Zero……………………………………………………………………...10
3. Tare……………………………………………………………………...10
4. Hold function…………………………………………………………....11
5. Print and Accumulation……………………………………………….11
6. BMI function…………………………………………………………….11
7. Precision*10…………………………………………………………………11
7. PARAMETER……………………………………………………………….12
8. CALIBRATION……………………………………………………………..14
9. BATTERY OPERATION…………………………………………………..15
10.MAINTENANCE……………………………………………………………16
10.1 General………………………………………………………………..16
10.2 Error codes……………………………………………………………17
10.3 Determine the Problem……………………………………………...17
10.4 Check the Load Cell…………………………………………………17
10.5 Check PCB Voltages………………………………………………...18
10.6 Trouble Shooting……………………………………………………..19
10.7 Cleaning……………………………………………………………….19
11.DISPOSAL……………………………………………………………………21
12.WARRANTY……………………………………………………………………22

M503 Series chair Scales Service Manual (3.09)
- 2 -
1. PRECAUTIONS
WARNING
DISCONNECT ALL POWER TO THIS UNIT
BEFORE INSTALLING, CLEANING, OR
SERVICING. FAILURE TO DO SO COULD
RESULT IN BODILY HARM OR DAMAGE THE
UNIT.
WARNING
WHEN USING THE NONE PROFESSIONAL
PERSON CAN’T TOUCH THE SLOPE.
WARNING
NONE PROFESSIONAL PEOPLE SHOULD
AVOID TOUCHING WARINING POSITION, IN
ORDER TO AVOID DANGEROUS

M503 Series chair Scales Service Manual (3.09)
- 3 -
WARNING
Warning : No modification of this equipment is
allowed.
CAUTION
•Permit only qualified persons to service the instrument
•Before connecting or disconnecting any components, remove the
power.
•
Failure to observe these precautions bodily harm or damage to or
destruction of the equipment.
•Follow the instructions in the instructions for use.
•Keep the operating instructions and the declaration of
conformity in a safe place.
•Ensure that the scale is standing firmly on a smooth, level
surface.
•Do not drop the scale or subject it to violent shocks.
•When using the scale with a mains unit, ensure that the
supply cable is routed in such a way as to exclude any type
of tripping hazard.
•Use only the type of battery stated.
•Have scale serviced and re-calibrated on a regular basis.
•Have repairs carried out only by authorized persons.

M503 Series chair Scales Service Manual (3.09)
- 4 -
2. INTRODUCTION
The M503 series chair scales, that amplifies signals from a load cell,
converts it to digital data and displays it as a mass value.
It is accurate, fast and versatile series of general purpose balances with %
weighing functions and accumulation.
All models with ECTAC(Class III) and conform 93/42/EC directive.
Materials used according to REACH directive.
Ergonomically optimized seat, comfortable, safe and reliable.
Grasp the handrails in two ways: gross grip area, vertical grip area.
Handrails with rubber material, comfortable and safe.
Adjustable angle of instruments to meet the user reading.
4 transportation wheels with brake.
Footrest foldable, when folded out with low distance to the floor.
Each single armrest foldable.
Bag for power supply fixed on the chair, when power supply not in use.
Optional RS-232 interface, can connect computer and printer.
M503 wheelchair scale is applicable to the people who can’t walk, and
must with wheelchair on the scale, if the patient status is ok, they can
operate the scale by themselves.
The product can transport by air transportation, ocean shipping, land
transportation.
Storage in normal temperature and humidity.
The temperature for transport and storage is 10°-30°,the humidity for
the transport and storage is 30%-60%.
M503 should be used continuously.

M503 Series chair Scales Service Manual (3.09)
- 5 -
Strong magnetic fields should be avoided when using. It will influence the
weighing of the scale.
3. SPECIFICATION
3.1 Specifications
Model
M501-250k
Maximum Capacity
300kg
Readability
100g
Resolution
1/2,500
Tare range
-299.9kg
Minimum Capacity
2000g
Linearity ±
200g
Common Specifications
Interface
RS-232 Output Optional
Stabilisation Time
2 Seconds typical
Operating Temperature
-10℃-40℃
Power supply (external)
12V/500mA AC power adapter or 2000mAh Ni-MH
batteries (optional, size AA)
Calibration
Automatic External
Calibration as per Directive
90/384/EEC
Class III medical approval
Medical product as per
Directive 93/42/EEC
ClassI
ADC
Σ-Δ
Display
25 mm high 6 digits LCD with auto backlight and
loading bar graph
Housing
Aluminium platform, ABS plastic indicator
Gross weight
75kg

M503 Series chair Scales Service Manual (3.09)
- 6 -
3.2 Load Cell Specifications
Model No
L6E3
Rated Capacity (kg)
2.5/3/5/6/8/10/15/20/30/35/40/50
Sensitivity
2.0±0.2 mv/v
Excitation Voltage
5~12V
Material
Aluminum
Cable
0.3~3m Φ 4mm
Input Resistance
409Ω ±6Ω/1065Ω ±15Ω
Out put Resistance
350Ω ±3Ω/1000Ω ±10Ω
Temperature Range
-35°C ~ +65°C
Safe overload
150%F.S
Ultimate overload
300%F.S
Error
±0.0233%F.S
Creep (20min)
±0.020%F.S
Zero Balance
0±5%mV/V
Max. Platform Size
250x350mm

M503 Series chair Scales Service Manual (3.09)
- 7 -
4. INSTALLATION
Unpacking
Carefully take the balance out of its package, make it sure its not damaged and
all accessories are included.
•Remove the weighing scale from the carton.
•Remove the protective covering. Store the packaging and to use if you
need to transport the scale later.
•Inspect the scale and terminal for damage.
•Make sure all components are included
Accessories,
1. Balance
2. Adaptor
3. Product manual
Level Adjusting
Place the scale on a table.
Check the water mark. If, bubble is not centre
adjust the leveling feet until reach centre. Check
the level when you change the location.
Charging Battery
•To charge the battery insert the adaptor pin to jack, jack is locating rear side
of the scale. Adaptor simply plug into the mains power. The scale no
needs to be turned on.
•The battery should be charged for 12 hours for full capacity.
•In the display there is an indicator show the status of battery charging.
When the scale is plugged into the mains power the internal battery will be
recharged. If the indicator off, the battery has a full charge. If it is on, the
battery is nearly discharged and if yellow, the battery is being charged.
•Do not use any other type of power adaptor than the one supplied with the
scale.
•Verify that the AC power socket outlet is properly protected.
Note: Please charge the battery before using the scale for the first time

M503 Series chair Scales Service Manual (3.09)
- 8 -
Installation
RS-232 Connecter (selectable)
USB Connecter (selectable)
Load cell Connecter
Adaptor socket
Calibration switch
•Place the scale on a table.
•Connect the adaptor pin in to the scale adaptor jack. Adaptor jack is
locating, rear side of the scale.
•Adaptor connects into your AC power socket.
Pluggable equipment must be installed near
an easily accessible socket outlet with a
protective ground/ earth contact. Note:the
adaptor model is GTM41076-0624,can’t use
any other adaptor.
•The RS-232 port can connect to computer,printer,ect.
•Turn on the On/Off key. If you want to turn off, press the key again.
•Display will be show the version number and will be starting self checking.
•After self checking, display will be come to normal weighing mode.
•Warm-up time of 15 minutes stabilizes the measured values after
switching on.
•Calibrate with exact calibration weights, minimum 1/3 of the scale capacity
want to use for calibration. For calibration see details in parameter.
Then you can start your operation

M503 Series chair Scales Service Manual (3.09)
- 9 -
5. DESCRIPTION
Key Board
power On / Off
Set to hold mode
`
Sets display to Zero
Print function
Set to BMI mode
Page down / decrease the number
Page up / increase the number

M503 Series chair Scales Service Manual (3.09)
- 10 -
Display
DISPLAY
FUNCTION
STABLE
Indicator for Display stability
ZERO
Indicator for Zero display
TARE
Indicator for Tare display
Indicator for weighing capacity graph
NET
Indicator for Net weight
GROSS
Indicator for Gross weight
Cm/inch
Indicator for measuring units
Lb/kg
Indicator for weight units
Indicator for Charging status of battery
Voltage has dropped
Low Voltage
Fully Charged

M503 Series chair Scales Service Manual (3.09)
- 11 -
6. OPERATION
Initial Start-up
Warm-up time of 15 minutes stabilizes the measured values after switching on.
6.1 Power ON/OFF
Switch on the scale by pressing . The display is switched on and the
self test is started.
If you want to switch off press the key again.
6.2 Zero
Set the display of your balance to zero at any time by pressing key.
6.4 Hold function
Press before load at the pan, so HOLD is active now. "Hold " and "-----"
appeared at the display.
After put load at the pan no indication until a stable non-zero weights is
detected. During this period "----" is indicated. (no indication of unstable
value).You will hear an acoustic beep, when stable weight is detected.
Indication of calculated HOLD-value with small "HOLD" in display as current
version. The unit “kg” is displayed.
After unloading the pan the value is indicated for 10 Seconds. After that
normal weight displaying is resumed.
Pressing , while the HOLD-function is active, will cancel the HOLD-
function.
6.5 Print function
Press key to print the weight value (see the parameter on Section 7)

M503 Series chair Scales Service Manual (3.09)
- 12 -
6.6 BMI function
Press key on the weighing mode, display will show the last height “xxxxxx”,
use or key shift the twinkling digit, and press and key to
change the value, press key confirm it, display will enter into the BMI mode,
“BMI” indicator will be shown, people stand on the platform, display will show the
BMI value and the bar graph.
Press key will turn back to weighing mode.
6.7 Precision*10
If want to see more accurate weight value, press and hold for 2 seconds,
display will show one more decimal place, the last digit will twink for 5 seconds,
then it will go back to normal weighing value automatically.

M503 Series chair Scales Service Manual (3.09)
- 13 -
7. PARAMETERS
Enter the Menu
•Turn on the scale. Press and hold at normal weighing model, display
will show
Choose the Menu
•Press or , it can choose menu block or options
one by one.
Enter the Selected Menu
•Press ,it can confirm which is displayed.
Enter in to TECH
Note: Before enter the tech menu, press calibration switch, which is
locating below the scale
•When display showed Pi n , press and keys to enter
the function
Parameter Block
Menu
Sub Menu
Description
F1 off
0/3/5/15/30
To set the auto off time:
Disable / 3mins / 5mins / 15mins / 30mins
F2 swt
off
To disable print function.
prt
To enable print function.
Seire
send data continuous
P prt
By pressing Print key , weighing value will be added
to the memory and print the print out
F1 off

M503 Series chair Scales Service Manual (3.09)
- 14 -
F3 prt
P cont
Cont 1
Send data continuous, use protocol of
Tscale
Cont 2
Send data continuous, use protocol of
Toledo
Cont 3
Send data continuous, use special
protocol
P auto
Automatic accumulation.
Individual weighing values are automatically added
Ask
ASK mode
Command W: read the data at the moment
Command S: read the data when stable
Command T: Tare
Command Z: Zero
P stab
Send data when the weighing values is stable
P cnt2
another continuous mode.
Set BAUD rate
After setting the RS 232 mode, display will be shown current baud
rate b XXX.
Baud rate Options: b600,b1200,b2400,b4800 and b9600
Set print out format
If enter settings p prt,p auto and connected with optional printer
Prt 0-3
M+ format- Date/Time
Lp-50 /
tpup
Printer LP-50 or Tp-up
F4 bk
Bl on
Set the backlight always on.
Bl off
Set the backlight always off.
Bl au
Set the backlight automatic on.
Tch
pin
Enter the password
P 1 spd
Set A/D convert speed(7.5/15/30/60)
P 2 Cal
SNG RA
desc
Set decimal point
Inc
Set increment
cap
Set capacity
cal
Enter calibration
Dual int
desc
Set decimal point
Inc
Set increment of dual range
Sdiv 1：increment of first range
Sdiv 2
：
increment of second range
cap
Set capacity of dual range
Cap1
: capacity of first range

M503 Series chair Scales Service Manual (3.09)
- 15 -
Cap2: capacity of second range
cal
Enter calibration
Dual RA
desc
Set decimal point
Inc
Set increment of dual range
Sdiv 1：increment of first range
Sdiv 2
：increment of second range
cap
Set capacity of dual range
Cap1: capacity of first range
Cap2
: capacity of second range
cal
Enter calibration
P 3 pro
tri
Display will show XXXXX. For trimming the load
cells, showing primary weight.
You can calculate new rate by this formula:
N2=N1+N1×[(K2-K1)÷K2]
N1: primary rate, N2: new rate, K1: calibrate weight,
K2: display weight
count
To show the scale internal count
reset
Reset the scale
setgra
Set the gravity value
8. CALIBRATION
Calibration Settings in the Parameter;
•Turn on the scale. And when in the normal display
•Press and hold key, display will show
•Press key , display will show
•Press key to confirm, display will show
•Press and keys orderly, display will show
•Press key, display will show
F1 off
tch
pin
P1 spd
P2 cal

M503 Series chair Scales Service Manual (3.09)
- 16 -
•Press key to enter calibration, display will show
•Press key, display will show
•Press key to confirm, display will show
•Make the stand pan empty, When scale get stable, Press key,
display will show the calibration value, (You can press
and to change the value) then press to confirm, display
will show
•Place the test weight on the platform, after stable, press key to
confirm, display will show
•Then will start self-test and will come to normal display.
Cal
unload
pass
desc
load

M503 Series chair Scales Service Manual (3.09)
- 17 -
9. BATTERY OPERATION
The Medical Scales can be operated from the battery if desired. The battery life
is about 20 hours.
When the battery needs charging a symbol on the weight display will turn on. The
battery should be charged when the symbol is on. The scale will still operate for
about several minutes after which it will automatically switch off to protect the
battery.
To charge the battery simply plug into the mains power. The scale does not need
to be turned on.
The battery should be charged for 12 hours for full capacity.
Just under the quantity display is an LED to indicate the status of battery
charging. When the scale is plugged into the mains power the internal battery
will be charged. If the LED is green the battery has a full charge. If it is blue,
It indicates the battery is being charged.
As the battery is used it may fail to hold a full charge. If the battery life becomes
unacceptable then contact your distributor.
Note: useless battery should be recycled, not throw away as domestic waste.

M503 Series chair Scales Service Manual (3.09)
- 18 -
10. MAINTENENCE
WARNING
DISCONNECT ALL POWER TO THIS UNIT
BEFORE INSTALLING, CLEANING, OR
SERVICING. FAILURE TO DO SO COULD
RESULT IN BODILY HARM OR DAMAGE THE
UNIT.
CAUTION
•Permit only qualified persons to service the instrument
•Before connecting or disconnecting any components, remove the
power.
•Failure to observe these precautions bodily
harm or damage to or
destruction of the equipment.
10.1. General
If the scale does not operate properly, find out the problem as possible.
Determine whether the problem is constant or alternate. Be aware that problems
can be caused by mechanical or electrical influences.
Check the following.
•Water
•Corrosive materials
•Vibrations or temperature or wind
•Physical damage
Check the scale cables for damage, and check all connections and connecters
for any loose contact or incorrect connection

M503 Series chair Scales Service Manual (3.09)
- 19 -
Cleaning
•Disconnect the power before cleaning.
•Use a cloth with mild suds and light cleaning agents.
•Make sure that fluid not able to get into the device.
•Use a clean and soft cloth for rub off.
10.2. Error Codes
Error Code
Description
POSSIBLE CAUSES
Err 4
Exceed manual zero range
(press )
•Goods on the platform
•Overload, when
zeroing the scale.
•Improper calibration
•Load cell problem
•
PCB problem
Err 6
A/D Count out of the range
•Platform not installed
•Load cell problem
•
PCB problem
Err 19
Exceed Auto Zero range
When switch on the scale •Goods on the platform
•Improper calibration
•Load cell problem
•
PCB problem
10.3. Determine the Problem
Determine whether the problem is in the PCB or the Load Cell
•Remove power from the system, and disconnect the load cell connection
from the PCB
•Connect the PCB to a load cell simulator
•Reapply power and test the PCB
•If problem goes away, its source is probably in the Load cell. Check the
wiring, connecter, load cell and mechanical components of the load cell.
If problem persists, its source is probably in the PCB. Check the PCB voltages,
connecters, cables and function programs