Adam Equipment MCW-250 L User manual

© Adam Equipment Company 2006
Adam Equipment
Service Manual
Adam Equipment Co. Ltd.
p.n. 8090, Rev. A1, June 2006
MCW-250 L

© Adam Equipment Company 2005

© Adam Equipment Company 2006
CONTENTS
1.0 INTRODUCTION .............................................................................................2
2.0 KEYS AND DISPLAY DESCRIPTION .............................................................2
3.0 TROUBLESHOOTING THE MCW-250L..........................................................3
4.0 TECHNICAL SPECIFICATIONS......................................................................4
5.0 SETTING UP THE SCALE...............................................................................4
6.0 WEIGHING ......................................................................................................5
7.0 USER CALIBRATION ......................................................................................6
8.0 WARNING........................................................................................................8
9.0 ADJUSTMENT AND REPAIRS........................................................................9
9.1 ADJUSTMENT .............................................................................................9
9.2 REPAIRS......................................................................................................9
9.2.1 ELECTRONICS REPAIR ..........................................................................9
9.2.2 MECHANICAL REPAIR ............................................................................9
10.0 DIAGRAMS....................................................................................................11

© Adam Equipment Company 2006 2
1.0 INTRODUCTION
The MCW 250L scale is a Digital Physician Chair Scale which allows the patients to
be weighed while seated. It is an accurate electronic device with advanced design
and stable performance.
2.0 KEYS AND DISPLAY DESCRIPTION
KEYS FUNCTIONS
[Tare/Zero
On/Off]
To turn the scale on or off.
To zero the scale if the display drifts from zero.
To tare the scale, if necessary.
[Hold] To lock the reading even if the person to be weighed is moving.
[Kg/ lb] To toggle the weighing unit between Kg. and lb
DISPLAY DESCRIPTIONS
ZERO This indicator will be displayed in the left corner when the scale
reaches zero.
The arrow indicator will point at Kg, lb, Hold or/and Tare marked near
the LCD panel, as on when they are chosen.
When the battery is low, this symbol will be displayed in the left of the
display. Connect the adapter to recharge the battery.
The charge light will be on when the battery is recharging.
Full
FullFull
Full
When the load on the platform is over the maximum capacity, it will
appear on the display.

© Adam Equipment Company 2006 3
3.0 TROUBLESHOOTING THE MCW-250L
PROBLEMS SUGGESTIONS
Nothing happens when
[On/off] is pressed
Press the switch situated on side
of the indicator to ON, for battery
operation
Display turns ON but then
goes off
Charge the battery
Display shows “ FULL ” and
does not change when the
person to be weighed
stands on the platform
Check whether the cable from the
base is properly plugged into the
socket on the indicator
Check whether the cable is
damaged
The scale does not weigh
accurately
Calibrate the scale
Check the kg/lb selection before
weighing
Charge the battery
Check the cable
The person on the scale should
not move
Check nothing is rubbing against
the platform
Check the base assembly is not
damaged
Replace the PCB
Display does not change Check HOLD is not activated

© Adam Equipment Company 2006 4
4.0 TECHNICAL SPECIFICATIONS
Model MCW-250L
Maximum Capacity 250 kg / 550 lb.
Readability 0.1 kg / 0.2 lb.
Repeatability 0.2 kg / 0.4 lb.
Linearity 0.2 kg / 0.4 lb.
Units of measure kg, lb
Display LCD with 29mm/ 1.1” digits
Overall dimension
(w x d x h)
650 x 880 x 970 mm /
25.6” x 34.6” x 38.2”
Environment for use Temperature: 5ºC to 40ºC,
41ºF to 104º F
Humidity :<85% RH
Power Through AC Adapter
Battery Internal re-chargeable
Gross weight 37.8 kg/ 83.3 lb.
Net weight 27.1 kg/ 59.7 lb.
5.0 SETTING UP THE SCALE
The MCW-250L comes with a chair fitted on the scale platform. There is no
assembly necessary, attach the indicator to the bracket, simply plug in the power
supply and it is ready for use.
The indicator could be removed from the chair for mounting to the wall or used on a
table top. Brackets are available for wall mounting the indicator.
POWER SUPPLY
The scale uses an internal re-chargeable battery. If the external power supply is to
be used, plug it into the jack on the indicator.
When the battery is low, a low battery symbol will be displayed in the left of the
display. Connect the adapter to recharge the battery.

© Adam Equipment Company 2006 5
6.0 WEIGHING
•Place the Physician Scale on an even floor and press the [On/Off] key.
•The instrument performs a self-test after which it is ready for operation.
The display will show “ SCALE ”, “ 250.00 ” (Capacity), “ Ur x.xx ” (the
software revision number), “ 10.0.0.0.0 ”, “ DC. 6.00 ” (the voltage of the
battery) and then will show “ 0.0000 ” with an arrow symbol, indicating
the last chosen unit (kg or lb).
•Press the [On/Off] key for 2 or 3 seconds and the machine switches
off. If the machine is not to be used for a long time, the main power
switch shall be turned off.
•The scale has a back-light which is switched on every time the scale is
turned on or the [On/Off] key is pressed during the operation.
•When in the weighing mode, press [On/Off], the scale will show
“ 0.000 ” when the initial zero is within 4℅of the maximum capacity.
•The person to be weighed can step on to the platform now. The weight
will be display in Kg. or lb. depending on the units chosen by the user.
•If the weighing value is to be tared to obtain the net value, press the
[On/Off] key again.
•Press the [kg/lb] key for changing the weighing unit to kg or lb. An
arrow will indicate towards the chosen unit.
•Overload display: When “ FULL ” appears on the display, it shows that
the load on the platform is over the maximum capacity. Under these
circumstances, it is necessary to reduce the load otherwise the sensor
or the platform will be damaged.
•Hold Function: To lock the weighing result, press the [Hold] key. The
arrow indicator will point towards HOLD and it will the show a steady
reading even if the person on the platform is moving or goes away from
the scale and will not affect the next weighing. To release the function,
press the [Hold] key again.
•Do not press the [On/Off] key if you do not want to weigh as pressing
the [On/Off] key will switch the scale to ON.

© Adam Equipment Company 2006 6
7.0 USER CALIBRATION
1. Press [On/Off] key when the display shows ” SCALE ”.
2. Press [On/Off] key again.
If the display is not showing “ Id01 ” open the upper housing and switch the
span jumper on PCB to ON.
Start again by pressing [On/off].
The display shows “ Id01 ”, “ Id-02 ”, “ Id05 ”, “ Id10 ”,” Id-20 ”, “ Id-50 ”.
3. Select “ Id01 ” for 100g increments and press the [On/Off] key once.
4. The indicator will show the selection capacity: “ P1000 ” “ P2000 ”….” P5000 ”,
Select “ P2500 ” for 250kg, then press the [On/Off] key once.
5. Indicator will automatically show the decimal points: “ POT 0 ” “ PT0.0 ” “ T0.00 ”
“ T0.000 ”, “ POT 0 ”. Select the “ PT0.0 ” and press the [On/Off] key again.
6. Indicator will display “ ULOAD ”. Press the [On/Off] key again.
7. Indicator will show the internal value. After it is stable, it will show “ LOAd ”.
8. Put the mass (suggest the full capacity) and press the [On/Off] key, the
indicator shows the internal value (after loading) and the will show “ Ld-In ” after
stable.
9. Press the [On/Off] key. Then press the [Hold] key. The last digit of the
display will be moving from “ 0-9 ”. Press the [Hold] key, the digit will move

© Adam Equipment Company 2006 7
forward to one position. When the figure displayed is same as the capacity of
the standard weight, press the [On/Off] key.
For example: If a 10 kg weight is used instead of full capacity:
After you process till the step (9) as above, press the [On/Off] key.
The indicator will show: “ 0.0 ”. Press the [Hold] key, the last digit will be
automatically jumped from “ 0 ” to” 9 ”. When the figure jumps to “ 1 ”, press the
[Hold] key three times. Now, the “ 1 ” will be moved to the 3
rd
forward position
and the display will be changed to “ 10.0 ”. At this time you are required to
press the [On/Off] key immediately.
Next the display will show the current weight on the pan.
10.The Calibration is now complete.
11.Set the span jumper on the PCB to OFF position and re-seal the indicator.
12.If the selections made during calibration are not as described as above, the
scale may still work but will not show accurate results. In such cases, re-do
the calibration as shown above.

© Adam Equipment Company 2006 8
8.0 WARNING
•Do not dismantle the chair-weigher without following the necessary
instructions.
•Do not jump while standing on the load-bearing board. This may damage
the sensor inside.
•Do not move the chair-weigher violently and abruptly. It is recommended
to move and put down the chair-weigher gently.
•It is suggested to wipe the stains with soft cloth soaked with detergent and
to wipe later with soft cloth too. Do not use organic solutions and boiled
water to wipe the stains. Do not use water for cleaning.
•Keep the chair-weigher in a dry and clean environment. Do not expose it
outdoor or use it in locations near fire, under direct sunshine or with high
temperature.
•The [On/Off] key on the screen board only switches off the screen power
instead of the entire power to the chair-weigher. Therefore, it is necessary
to switch off the main power supply when the chair-weigher is not in use
for a long time. Otherwise the battery may be damaged as a result of
over-discharge of electricity.

© Adam Equipment Company 2006 9
9.0 ADJUSTMENT AND REPAIRS
9.1 ADJUSTMENT
The users can not make any adjustments other than Calibration.
9.2 REPAIRS
9.2.1 ELECTRONICS REPAIR
The most common electrical problems are-
1> Broken cables between the base and indicator,
2> Broken cables or poor connections on cables within the indicator.
3> Lead Acid battery has reached the end of its life.
Check the cables for loose connections, poor contact or abrasions on the sides and
replace as necessary.
The battery for the scales is a Lead Acid type with 6V, 5AH capacity. If the battery
must be replaced, use another Lead Acid battery of similar capacity only.
If the battery shows less than 6.5Vdc after charging, it is probably not holding the
charge and should be replaced.
The electronics used in the MCW- 250L scales consist of a main PCB assembly with
a second small PCB for the keys. The main PCB assembly is not user serviceable.
If a problem is found on the PCB, it should be replaced.
Contact your Dealer or Adam Equipment for assistance.
9.2.2 MECHANICAL REPAIR
The mechanics of the scale consists of a lever system to transfer the weight to the
single load cell. The lever system has series of bearings and knife edges to transfer
the weight from the platform to the load cell.

© Adam Equipment Company 2006 10
Any broken knife edges, bent “S” links or severe misalignment can cause poor
weighing results. Inspect for damage and try to re-align parts if necessary. If any of
the mechanical parts are damaged or missing, it is usually not possible to do a cost-
effective repair.
Contact your Dealer or Adam Equipment for assistance.
If the load is being directed to the load cell properly and still the weighing results are
not satisfactory, then the load cell may be faulty.
A couple of tests which are to be done to verify the load cell are as follows-
•Within the indicator identify the load cell connector on the PCB. Voltage
measurement between pins 1 and 4 should be 5Vdc ±5%. If this voltage is
not correct then the main PCB should be replaced.
•Voltage between pins 2 and 3 should be approximately 0 to 1mv. This
voltage should increase as the load is applied to the platform up to about 8mv.
With 250kg on the scale, if the voltage is zero and does not increase- check
the cable connecting the load cell to the indicator.
•If the voltage with 0 kg load is greater than 2mv then the load cell is likely to
be damaged.
•If the voltage does not change with load then check the mechanical linkage to
the load cell. Otherwise the load cell is damaged.

© Adam Equipment Company 2006 11
10.0 DIAGRAMS

© Adam Equipment Company 2006

© Adam Equipment Company 2006
Manufacturer’s Declaration of Conformity
This product has been manufactured in accordance with the harmonised European standards, following the
provisions of the below stated directives:
Electro Magnetic Compatibility Directive 89/336/EEC
Low Voltage Directive 73/23/EEC
Adam Equipment Co. Ltd.
Bond Avenue
Denbigh East Estate
Milton Keynes, MK1 1SW
United Kingdom
FCC COMPLIANCE
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. The
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.
Shielded interconnect cables must be employed with this equipment to insure compliance with the
pertinent RF emission limits governing this device.
Changes or modifications not expressly approved by Adam Equipment could void the user's authority
to operate the equipment.

© Adam Equipment Company 2006
ADAM EQUIPMENT is an ISO 9001:2000 certified global organisation with more
than 30 years experience in the production and sale of electronic weighing
equipment. Products are sold through a world wide distributor network supported
from our company locations in the UK, USA and SOUTH AFRICA.
ADAM’s products are predominantly designed for the Laboratory, Educational,
Medical and Industrial Segments. The product range is as follows:
- Analytical and Precision Laboratory Balances
- Top Loading Scales for Educational establishments
- Counting Scales for Industrial and Warehouse applications
- Digital Weighing/Check-weighing Scales
- High performance Platform Scales with extensive software
features including parts counting, percent weighing etc.
- Crane scales for heavy-duty industrial weighing
- Digital Electronic Scales for Medical use
- Retail Scales
Adam Equipment Co. Ltd.
Bond Avenue
Milton Keynes
MK1 1SW
UK
Phone:[phone]
Fax: [phone]
e-mail:
[e-mail]
Adam Equipment Inc.
26, Commerce Drive
Danbury, CT
06810
USA
Phone: [phone]
Fax: [phone]
e-mail:
[e-mail]
Adam Equipment S.A. (Pty) Ltd.
P.O. Box 1422
Kempton Park 1620
Johannesburg
Republic of South Africa
Phone [phone]
Fax: [phone]
e-mail:
[e-mail]
© Copyright by Adam Equipment Co. Ltd. All rights reserved. No part of this publication
may be reprinted or translated in any form or by any means without the prior permission of
Adam Equipment.
Adam Equipment reserves the right to make changes to the technology, features,
specifications and design of the equipment without notice.
All information contained within this publication was to the best of our knowledge timely,
complete and accurate when issued. However, we are not responsible for misimpressions
which may result form the reading of this material.
The latest version of this publication can be found on our Website.
Visit us at www.adamequipment.com