Adam Equipment CBW Series User manual

@Adam Equipment Company 2005
Adam Equipment
CBW SERIES
SERVICE MANUAL
ADAM EQUIPMENT CO. LTD.
p.n. 4331, Rev. A3, January 2005

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CONTENTS
1.0 INTRODUCTION .............................................................................................3
2.0 TROUBLE SHOOTING GUIDE........................................................................3
3.0 ERROR CODES ..............................................................................................5
4.0 CBW DESCRIPTION .......................................................................................6
5.0 CBW CALIBRATION & PARAMETERS (VER.1.2-2.03)..................................7
5.1 CBW CALIBRATION (VER. 1.2-2.03) ..........................................................7
5.2 CBW PARAMETERS (VER. 1.2-2.03)..........................................................8
6.0 TWO POINT FACTORY CALIBRATION........................................................10
6.1 ADC OUTPUT CHECKING............................................................................11
7.0 LOAD CELL DAMAGE...................................................................................12
8.0 CBW RS-232 INSTALLATION.......................................................................14
9.0 SCHEMATICS ...............................................................................................16

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1.0 INTRODUCTION
The CBW series of scales are general purpose scales.
Refer to the Operators Manual for details of operation.
This manual will cover details of calibration and troubleshooting.
If you have a problem with the scales that is not directly addressed by this manual
then contact your dealer or Adam Equipment for more assistance.
In order to supply further assistance we will need the following information:
2.0 TROUBLE SHOOTING GUIDE
PROBLEM POSSIBLE CAUSE
Display is blank Power Switch faulty or not connected
No turn on test Battery not charged or faulty
Power supply faulty or incorrect type
E6 is displayed Pan not installed
Poor connection
Load cell damaged
Electronics faulty
“- - - - - -“appears on display Maximum capacity exceeded
Load Cell damaged
Electronics is faulty
Name of your company:
Contact Name:
Contact telephone, e-mail, fax or other methods:
Model number of the scales:
Serial number:
Software revision number (displayed when power is first turned on):
Brief description of the problem:
Include any recent history of the scale. For example-
Has it been working since it’s delivered
Water entered
Damaged from a fire
Electrical Storms in the area
Dropped on the floor, etc.

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Display is unstable Drafts or air currents
Obstruction under pan
Sample is moving (animal weighing)
Vibrations through table
Temperature changed dramatically
Electronics faulty or Battery low
Weight value incorrect Calibration error, Recalibrate
Unit calibrated with inaccurate weight
Balance not level
Obstruction between sample pan
Wrong unit of weight displayed
Cannot use Full Capacity Over-load Stops hitting pan support or hitting
bottom of load cell
Electronics faulty
Parameters set incorrectly
Load Cell Damaged
Not Linear Overload stops hitting too soon
Faulty factory calibration
Off Centre Loading error Overload Stops not correct
Obstruction under pan
Battery will not charge Charging circuit failure
Battery Failure
Incorrect adapter (below 800 mA)
Processor failure

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3.0 ERROR CODES
ERROR CODE DESCRIPTION POSSIBLE CAUSES

Initial Zero is greater than
allowed (4% of maximum
capacity) when power is turned
on or when the [Zero/Enter] key
is pressed.
Weight on the pan when turning
the scale on.
Excessive weight on the pan when
zeroing the scale.
Improper calibration of the scale.
Damaged load cell.
Damaged Electronics.

Keyboard error. Improper operation of the scale.

A/D count is not correct when
turning the scale on. Platform is not installed.
Load cell is damaged.
Electronics is damaged.

Scale is not stable when setting
the percentage weighing. The scale is not stable.
Improper operation of the scale.
 or 
or in old
versions 
Calibration error. Improper calibration (should be
within + 10% of the factory
calibration). The old calibration
data will be retained until the
calibration process is complete.

Scale is unstable. There is vibration or draft making
the scale unstable.
Electronics may be damaged.

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4.0 CBW DESCRIPTION
The CBW scales have an enclosure with all components mounted within it. To gain
access to the components remove the 4 screws securing the cover to the base.
The basic unit consists of:
Base
Load Cell frame
Power switch
Main PCB assembly
Battery
Display PCB assembly
Keypad
All models of CBW are similar except the selection of load cells and the program.
The main circuit board is the same as used in the CBC scales. Normally if a problem
is found with a circuit board the most cost effective method of solving the problem is
to replace the circuit board.
Schematics are attached in order to complete the documentation. However it is rare
that the problem due to a faulty component on the PCB is traced by a user.
The main PCB assembly includes:
A/D converter (AU1),
Microprocessor (DU1) and
Power supply/battery charger circuits (DU5, T2).

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5.0 CBW CALIBRATION & PARAMETERS (VER.1.2-2.03)
5.1 CBW CALIBRATION (VER. 1.2-2.03)
The CBW scales calibrate using metric weights and the CBWa scales can calibrate
using either metric or pound weights, depending on the weighing unit in use before
calibration.
To start calibration turn the scale off and then turn it on again. Press the [Tare] and
[%] keys together once, during the initial counting from 9 to 0 on the display.
The display will show "  ". Remove all weight from the pan and then press the
[Zero/Enter] key to set the initial zero point when the scale is stable.
The display will then show “  ” at which point the calibration mass should be
placed on the pan. It is best to use a weight close to the full capacity of the scale.
Press the [Zero/Enter] key. The display will then show the last mass used. If this is
the same as the mass on the pan then this can be used or a different value can be
entered.
To use this value, press the [Zero/Enter] key when the stable indicator is on.
Or if a different value is desired, enter the value using the []arrow key to select the
flashing digit and the []to increment the flashing digit. If value is correct, press the
[Zero/Enter] key to accept when the stable indicator is on.
Remove the calibration weight as the scale counts back from 9 to 0.
If an error message “   ” or “   ” is shown during calibration, re-check the
calibration and repeat, if necessary. If the error cannot be corrected contact your
dealer or Adam Equipment for advice.
After calibration the scale should be checked to verify the calibration and linearity is
correct. If necessary, repeat the calibration.
Note: Ensure that the scale is stable before accepting any weight.
To view the ADC Counts press [Zero/Enter] and [%] together. At zero load, it
should be 25,000 and at full load, it should be approximately 500,000.
CBW
a scales
will also have the Lb or Kg (or g)
indicator on to show the
denomination of the weight requested. If the scale was in pounds before starting
calibration the weights requested will be pound values, or if the scale was weighing in
kilograms then metric weights will be requested.

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5.2 CBW PARAMETERS (VER. 1.2-2.03)
The scale has several parameters that allow the user to set the scale to:
Display the weight in other increments of weight to minimise the affects of
vibration, wind or other environmental conditions.
Control the back light on the display. It may be necessary to turn the backlight
off to maximise battery life.
Set the Accumulation to Automatic, manual or set the RS-232 interface to
continuously print the weight.
Set the accumulation to be active when [Print] key is pressed or to be inactive.
Set a range for auto zero.
Select another weighing unit than the standard.
Disable the Limit Warning Beeper.
Adjust the ADC Speed.
To set these parameters press the [Func] and [Print] keys at the same time.
Setting the scale increment
The display will show "  " where  can be 1, 2, 5,10 or 20. The first value
shown is the default scale increment value.
To change to a different increment value press [Tare/].
Press the [Zero/Enter] key to store the changed value.
For example, on a 15kg scale the standard increment is 0.5g, the value can be
changed to 1.0g or 2.0g.
Control the backlight
The standard is to have the backlight operate automatically, turning it off when
the scale is not being used.
The backlight can be set to be "   ", "   " (Automatic) or "   ". The
maximum battery life is achieved with the backlight turned off.
Press the [Tare/] key to change the setting.
Press the [Zero/Enter] to store the changed setting.
Automatic accumulation
With "  " the memory will accumulate the weight automatically.
"  " will enable the manual accumulation.
"
  " will set the RS-232 interface to send the weight continuously and the
accumulation function is disabled.

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Press the [Tare/]key to change the setting.
Press the [Zero/Enter] key to store the changed setting.
Accumulation of data in memory when [Print] is pressed
To accumulate weight in the memory when [Print] is pressed, set "  ". To
use the [Print] key to only print the weight without adding it to memory, set " 
 ".
Press [Tare/]to change the setting between  and  .
Press the [Zero/Enter] key to store the changed setting.
Auto zero range
The auto-zero will automatically set the scale to zero when the displayed weight
is almost near zero. This helps to make sure that the scale is measuring weight
from an accurate zero starting point.
The Auto zero value can be set to 0.5, 1, 2 or 4 scale divisions. The normal
setting is 1 scale division. The display will show “  ”.
Press the [Tare/]key to change the value.
Press the [Zero/Enter] key to store the changed setting.
Selectable unit of weight displayed
The scales are normally set to display in kilograms, however they will show the
weight in grams, if enabled.
The display will show “  ” or “  ”.
Press [Tare/]to change the setting between  or  
Press the [Zero/Enter] key to store the changed setting.
The CBWa scales can change units from kilograms to grams, pounds or
pounds/ounces immediately if they are enabled as in the step above. This also
allows the scales to be calibrated in either kilograms or pounds and all memory
accumulations are in either kilograms or pounds as last selected.
When the scales are set to display in other units of weight the accumulation
function is still keeping the weight in kilograms (or pounds for the CBWa series)
in memory and will use the base weighing unit when printing over the RS-232
interface.

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Setting of the check weighing alarm
The display will show “  ” where “  ” is a digit from  to  .
will set the buzzer to off when check weighing
will set the buzzer to on when the OK symbol is on
will set the buzzer to on when the weight is outside the OK symbol limit
To change this digit press the [Tare/]key.
Press the [Zero/Enter] key to store the changed value and continue to the next
parameter.
Speed at which the machine will run the ADC
The slowest setting is  and the fastest is  . The default setting is usually  .
The display will show “  ”.
To change this setting press the [Tare/]key.
Press [Zero/Enter] to store the changed value and return to the normal weighing.
6.0 TWO POINT FACTORY CALIBRATION
This procedure is the same as normal calibration but can be set even if the stability
indicator will not show or when the raw counts do not seem to be moving.
Please ensure that the load cell is not damaged and that the load cell is wired
correctly with the right output voltages.
To start the factory calibration, turn the scale off and then turn it back on. Press the
[Limit] and [%] keys together during the initial counting from 9 to 0 on the display.
The display will show "  ". Remove all weight from the pan and then press the
[Zero/Enter] key to set the initial zero point when the scale is stable.
The display will then show the first calibration weight used. This value will be one
third of the scale capacity.
Place this value weight on the scale and press the [Zero/Enter] key when the stable
indicator is on
The display will then show then second value weight to be used which will be full
capacity of the scale.
Place this value calibration weight on the platform and then press the [Zero/Enter]
key when the stable indicator is on.
Remove the calibration weight as the scale counts back from 9 to 0.