Weighing Indicator Chair scales
Weighing Indicator
M503
Chair scales
M503 Series chair Scales Service Manual (3.09)
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
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M503 Series chair Scales Service Manual (3.09)
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
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M503 Series chair Scales Service Manual (3.09)
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.
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M503 Series chair Scales Service Manual (3.09)
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.
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M503 Series chair Scales Service Manual (3.09)
 Strong magnetic fields should be avoided when using. It will influence the
weighing of the scale.
3. SPECIFICATION
3.1 Specifications
Model
Maximum Capacity
Readability
Resolution
Tare range
Minimum Capacity
Linearity ±
Interface
Stabilisation Time
Operating Temperature
Power supply (external)
Calibration
Calibration as per Directive
90/384/EEC
Medical product as per
Directive 93/42/EEC
ADC
Display
Housing
Gross weight
M501-250k
300kg
100g
1/2,500
-299.9kg
2000g
200g
Common Specifications
RS-232 Output Optional
2 Seconds typical
-10℃-40℃
12V/500mA AC power adapter or 2000mAh Ni-MH
batteries (optional, size AA)
Automatic External
Class III medical approval
Class I
Σ-Δ
25 mm high 6 digits LCD with auto backlight and
loading bar graph
Aluminium platform, ABS plastic indicator
75kg
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M503 Series chair Scales Service Manual (3.09)
3.2 Load Cell Specifications
Model No
Rated Capacity (kg)
Sensitivity
Excitation Voltage
Material
Cable
Input Resistance
Out put Resistance
Temperature Range
Safe overload
Ultimate overload
Error
Creep (20min)
Zero Balance
Max. Platform Size
L6E3
2.5/3/5/6/8/10/15/20/30/35/40/50
2.0±0.2 mv/v
5~12V
Aluminum
0.3~3m Φ 4mm
409Ω ±6Ω/1065Ω ±15Ω
350Ω ±3Ω/1000Ω ±10Ω
-35°C ~ +65°C
150%F.S
300%F.S
±0.0233%F.S
±0.020%F.S
0±5%mV/V
250x350mm
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M503 Series chair Scales Service Manual (3.09)
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
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M503 Series chair Scales Service Manual (3.09)
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
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M503 Series chair Scales Service Manual (3.09)
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
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M503 Series chair Scales Service Manual (3.09)
Display
DISPLAY
STABLE
ZERO
TARE
NET
GROSS
Cm/inch
Lb/kg
FUNCTION
Indicator for Display stability
Indicator for Zero display
Indicator for Tare display
Indicator for weighing capacity graph
Indicator for Net weight
Indicator for Gross weight
Indicator for measuring units
Indicator for weight units
Indicator for Charging status of battery
Voltage has dropped
Low Voltage
Fully Charged
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M503 Series chair Scales Service Manual (3.09)
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
function.
, while the HOLD-function is active, will cancel the HOLD-
6.5 Print function
Press
key to print the weight value (see the parameter on Section 7)
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M503 Series chair Scales Service Manual (3.09)
6.6 BMI function
Press
use
key on the weighing mode, display will show the last height “xxxxxx”,
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.
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M503 Series chair Scales Service Manual (3.09)
7. PARAMETERS
Enter the Menu
•
at normal weighing model, display
Turn on the scale. Press and hold
will show
F1 off
Choose the Menu
•
Press
one by one.
or
, it can choose menu block or options
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
the function
and
keys to enter
Parameter Block
Menu
Sub Menu
Description
F1 off
0/3/5/15/30
F2 swt
off
To set the auto off time:
Disable / 3mins / 5mins / 15mins / 30mins
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
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M503 Series chair Scales Service Manual (3.09)
P cont
P stab
Send data continuous, use protocol of
Tscale
Cont 2
Send data continuous, use protocol of
Toledo
Cont 3
Send data continuous, use special
protocol
Automatic accumulation.
Individual weighing values are automatically added
ASK mode
Command W: read the data at the moment
Command S: read the data when stable
Command T: Tare
Command Z: Zero
Send data when the weighing values is stable
P cnt2
another continuous mode.
F3 prt
P auto
Ask
Cont 1
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
F4 bk
Tch
P 1 spd
0-3
M+ format- Date/Time
Printer LP-50 or Tp-up
Lp-50 /
tpup
Bl on
Set the backlight always on.
Bl off
Set the backlight always off.
Bl au
Set the backlight automatic on.
pin
Enter the password
Set A/D convert speed(7.5/15/30/60)
SNG RA
P 2 Cal
Dual int
desc
Inc
cap
cal
desc
Inc
cap
Set decimal point
Set increment
Set capacity
Enter calibration
Set decimal point
Set increment of dual range
Sdiv 1:increment of first range
Sdiv 2:increment of second range
Set capacity of dual range
Cap1: capacity of first range
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M503 Series chair Scales Service Manual (3.09)
Cap2: capacity of second range
Enter calibration
Set decimal point
Set increment of dual range
Sdiv 1:increment of first range
Sdiv 2:increment of second range
Set capacity of dual range
Cap1: capacity of first range
Cap2: capacity of second range
Enter calibration
cal
desc
Inc
Dual RA
cap
P 3 pro
cal
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
To show the scale internal count
Reset the scale
Set the gravity value
tri
count
reset
setgra
8. CALIBRATION
Calibration Settings in the Parameter;
•
Turn on the scale. And when in the normal display
•
Press and hold
•
Press
key , display will show
•
Press
key to confirm, display will show
•
Press
•
Press
key, display will show
and
keys orderly, display will show
key, display will show
F1 off
tch
pin
P1 spd
P2 cal
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M503 Series chair Scales Service Manual (3.09)
•
Press
key to enter calibration, display will show
desc
•
Press
key, display will show
Cal
•
Press
key to confirm, display will show
•
Make the stand pan empty, When scale get stable, Press
unload
key,
display will show the calibration value, (You can press
and
to change the value) then press
will show
•
to confirm, display
load
Place the test weight on the platform, after stable, press
confirm, display will show
•
key to
pass
Then will start self-test and will come to normal display.
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M503 Series chair Scales Service Manual (3.09)
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.
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M503 Series chair Scales Service Manual (3.09)
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
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M503 Series chair Scales Service Manual (3.09)
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
Err 4
Description
Exceed manual zero range
(press
)
Err 6
A/D Count out of the range
Err 19
Exceed Auto Zero range
When switch on the scale
POSSIBLE CAUSES
• Goods on the platform
• Overload, when
zeroing the scale.
• Improper calibration
• Load cell problem
• PCB problem
• Platform not installed
• Load cell problem
• PCB problem
• 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
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M503 Series chair Scales Service Manual (3.09)
10.4. Check the Load cell
•
•
•
•
Remove power from the system, and disconnect the PCB from the Load
cell
Check the moisture, or foreign material inside.
Make sure all leads are connected and correctly.
Check load cell for proper input and output resistances
Load Cell Connections
Measuring Points
Red (+ Exc) to White ( –Exc)
Green (+Sig) to Black ( –Sig)
Signal +
Supply +
Green
Red
Signal
-
Black
Supply Shield
White
Resistance
420 ±20Ω
350Ω ±5Ω
10.5. Check PCB Voltages
If the problem is in the PCB, use a multimeter to check the following voltages
10.5.1 AC Power
Check the AC power socket out put voltage.
• Voltage must be a -20% and +10% of the normal AC voltage.
10.5.2 Adaptor Voltage
Check the adaptor output cable connecter voltage
• Voltage must be minimum 9VDC and maximum 15VDC
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M503 Series chair Scales Service Manual (3.09)
10.5.3 PCB Input Voltage
Check the PCB input power connecter voltage
• Voltage must be minimum 9VDC in to the pin AD+
10.5.4 Check Battery Voltage and Charging Voltage
1. Check the Battery Voltage,
• Voltage must be minimum 6VDC. If below the 6VDC connect the adaptor
for charging
• The battery voltage below the 5.5VDC, replace the battery and install new
6V/3.4Ah battery.
2. Check the Battery Charging Voltage;
• Remove the battery connection terminals (Red and Black) from the battery.
• Connect the power and turn on the scale
• Voltage into the terminal minimum 6.5VDC
10.6 Trouble Shooting
Problems
Display is blank.
No self test
Blank display
after self test
OL or -------
------- or NULL
displayed
Possible cause
Mains power is turned
off. Power supply faulty
or not plugged. Internal
battery is not charged.
On/Off switch problem
Pan not installed.
Unstable weight, load
cell damaged
Common Solutions
Check power is getting inside the
scale and on/off switch is working.
Verify the voltages, which is on the
power labels.
Maximum capacity
exceeded. Load cell or
mechanics damaged.
Power supply faulty
Check the platform is installed
correctly. Try to turn on the scale
again. Do the calibration again
Weight is on the
platform is below
permissible limit. Pan
not installed correctly.
Power supply faulty.
Load cell or
mechanism faulty
Check the platform is installed
correctly. Try to turn on the scale
again.
Do the calibration again
Check the pans are installed
correctly. Try to turning on again.
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M503 Series chair Scales Service Manual (3.09)
Display is
unstable
Weight value
incorrect
Goods touching
somewhere. Air
variation or any
vibrations.
Temperature
changed . Load cell or
connections faulty.
Power supply faulty
Calibration error.
Platform of load cell
touching somewhere.
Wrong weighing unit
Can not use full
capacity
Over load protection
stoppers or transport
locks are not removed.
Parameters are set
incorrectly.
AD problem.
Load cell or
mechanism damaged
Platform Corner
Weight different
Over load protection
stoppers or transport
locks are not removed.
Load cell or
mechanism damaged
Mains voltage problem
Charging circuit
problem
Battery Problem
Battery not
charging
Check the scale is in acceptable
location.
Check the connecters and load cell.
Check the power supply and battery
Use accurate weight for to do the
calibration
Check the pan and load cell is
installed proper and touching.
Check the parameter settings.
Check the load cell and connecters
Check the stoppers and locks under
the platform.
Check the weighing unit and
parameter settings.
Check the load cell.
Check the stoppers and locks under
the platform.
Use accurate weight for to do the
calibration
Check the load cell.
Check the mains and adaptor.
Check the battery.
Check the charging circuit
10.7 Cleaning
The scale should be cleaned every week, to ensure the surface is clean, and the
disinfection is necessary, the medical thimerosal should be used. When the scale
is polluted by the organic compound, should select alkaline cleaning agent, when
the scale is polluted by the inorganic compound, should select acid cleaning
agent.
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M503 Series chair Scales Service Manual (3.09)
11. DISPOSAL
Disposing of the device
Do not dispose of the device in domestic waste. The device must be disposed of
properly as electronic waste. Follow the national regulations which apply in your
case. For further information, contact our service department at:
service@taiwanscale.com
Batteries
Do not throw used batteries away in domestic waste. Dispose of batteries at
collection points in the vicinity. When buying new batteries, select those low in
harmful substances and containing no mercury (Hg), cadmium (Cd) or lead (Pb).
12. ICON INSTRUCTION
Class Ⅲ medical scale
Do not dispose of the device in domestic
waste. The device must be disposed of
properly as electronic waste.
Warning
Refer to the manual please
Second category electrical equipment,
the electrical equipment must achieve
double insulation, strengthen insulation,
or protective insulation
The products comply with directive
93/42/EEC medical devices (MDD)
Direct current mark B type standard:
patient can touch directively
Refer to the manual please
A2
SN
Marking version
Serials number:7801003001
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M503 Series chair Scales Service Manual (3.09)
Manufacturer
TSCALE ELECTRONICS
MFG.(KUNSHAN)CO.,LTD
With its address
Kern&Sohn Gmbn.
Ziegelei 1 D 72336 Balinen-Frommern,
Germany
The temperature is from -10℃to 40℃.
e
Readability: capacity is 0~300kg, e=0.1kg
Capacity is 300~400kg,e=0.2kg
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M503 Series chair Scales Service Manual (3.09)
13. WARRANTY
A two-year warranty from date of delivery applies to defects attributable to poor
materials or workmanship. All moveable parts batteries, cables, mains units,
rechargeable batteries etc. are excluded. Defects which come under warranty will
be made good for the customer at no charge on production of the receipt. No
further claims can be entertained. The costs of transport in both directions will
be borne by the customer should the equipment be located anywhere other than
the customer’s premises. In the event of transport damage, claims under
warranty can be honoured only if the complete original packaging was used for
any transport and the scale secured and attached in that packaging just as it was
when originally packed. All the packaging should therefore be retained.
A claim under warranty will not be honoured if the equipment is opened by
persons not expressly authoried by T-scale to do so. We would ask our
customers abroad to contact their local sales agent in the event of a warranty
matter.
Responsible organization
Assessor
Department
Tom hong
technical department
Nancy Sui
product department
Mei Xiaopeng
P&D department
Post
Head man
team member
team member
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M503 Series chair Scales Service Manual (3.09)
The company was founded in Taiwan in 1967 as Taiwan Scale Mfg Co., Ltd in
order to produce Mechanical Weighing Instrument. Today, this privately owned
company is recognized worldwide as a leading Electronic Weighing Scale
Manufacturer. The core business of TSCALE is the development, manufacture,
worldwide sales/marketing and service of electronic weighing instruments.
The TSCALE products
 Medical Scale
 Counting Scale
 Tabletop Scale
 Retail Scale
 Precision Scale
 Platform Scale
 Weighing Indicator
 Crane Scale
 Floor and Pallet Scale
 Accessory
 Software
TSCALE has its manufacturing unit in Kunshan, China, ISO 9001 certified
company, ODM partner, more than 20 products have OIML certifications from
Holland’s NMI and Denmark’s Delta.
TScale Electronics Mfg. (Kunshan) Co., Ltd.
268, Zhujiawan Road, Kunshan, Jiangsu,China
Tel : +86 512 57067900 / 57669080
Fax: +86 512 5769508 / 57669100
Taiwan Scale Mfg. Co., Ltd
282, Sec.3, Hoping W.Rd., Taipei,
Taiwan
Tel : +886 2 23068203
Fax: +886 2 23044354
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