Yamato CPC-2000 User manual

CPC-2000 Technical Manual
YCO-1094-04-02
YAMATO CORPORATION
1775 S. Murray Blvd.
Colorado Springs, CO 80916 USA
Tel [phone] Fax [phone]
YAMATO TECH CORPORATION
#112-19425 Langley By-Pass
Surrey, B.C. V3S 6K1 Canada
Tel [phone] Fax [phone]
www.yamatocorp.com

YCO-1094-04-02
CPC-2000 Technical Manual
Table of Contents
SAFETY INSTRUCTIONS
I. Introduction 1
II. Setup 1
Technician Setup Mode
Setting the Keywords
Calibrating the Scale
III. Troubleshooting 6
IV. Wiring Diagram 7
V. Parts List 8
Before using the scale, carefully read, understand, and follow the “Safety Instructions” described in this manual. Observe the advice given in
the Operation Manual to ensure proper operation. Keep this manual handy for reference.
1) This scale is not an explosion-proof model. Do not use the scale in an atmosphere containing flammable gases or explosive fumes. A fire or an explosion can result.
2) Do not operate the scale if there is smoke or a burnt smell coming from the scale. Remove the batteries or unplug the AC adaptor immediately. After making sure that there is no
danger, consult your dealer. Never try to repair the scale by yourself.
3) Never step on or sit on the scale. Not only will the scale be damaged, but you may also be injured.
4) Place the item to be weighed in the center of the platform. Items placed on the edge of the platform may fall off and cause injury.
5) When weighing a heavy, large or unbalanced item, make sure the item is stable on the platform, otherwise, an accident may occur.
6) When carrying or moving the scale, be sure to hold it by the bottom of the base with both hands. If you hold it by the platform, the platform may become detached causing the scale to
fall. This will damage the scale. The platform is designed for easy removal and clean-up.
7) Do not insert your finger into the gap or holes in the scale. You may be injured.
To prevent damage to the scale
1) Do not push the indicator or keys with sharp objects. They may break or puncture the switch membrane panel.
2) Use the specified power supply and choose a suitable environment. If you do not, the weight readings may be inaccurate and the scale may be damaged.
3) The scale is a sensitive weighing instrument, avoid physical shocks. If you drop something on the scale, step on the platform, or drop it, the scale may be damaged and lose accuracy.
4) If the scale becomes dirty, wipe it with a soft cloth. For stubborn stains, apply a little neutral detergent and then wipe the scale with a dry cloth. Do not use thinner, benzene, hot water,
or chemical agents on non-metallic parts, all of which can cause deformation, discoloration, or deterioration.
5) Never remove the case. The fine adjustment section may be damaged and you may be injured by sharp edges on the internal parts.
6) Do not place the scale upside down.
7) When the low battery indicator appears, recharge the battery. The battery should only be replaced by a qualified scale technician. If the scale will not be used for a long period, have
the battery removed.
To keep the scale working efficiently
1) Place the scale on a flat stable surface that will support the scale and the load.
2) Do not place the scale in an area exposed to direct sunlight or to wind currents from an air conditioner, otherwise, the weights will not be accurate.
3) Do not place the scale near machines that create vibrations or electromagnetic disturbance, such as microwave ovens, portable phones, or large motors. This will affect the accuracy.
4) The operating temperature range is from –10°C to +40°C (14°F to 104°F). Do not subject the scale to sudden temperature changes; allow the scale to adjust to the new temperature
before use.
5) This scale is not waterproof or dustproof. Do not expose the scale to splashing water. Do not install the scale in an extremely humid or dusty environment.
6) If the scale is sealed, do not break the seal. If you break the seal, the scale will not be considered legal for trade. In this case, contact your dealer.
7) Do not disassemble or modify the scale, you will void the warranty. Modified scales will not be legal for trade.

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CPC-2000 Technical Manual
1
I Introduction
The CPC-2000 is available in a 4 lb (2 kg) model and a 10 lb (4 kg) model. It displays units of kilo-
grams, pounds and ounces (not legal for trade), decimal pounds, and continuous ounces. Any of
these units can be enabled or disabled in the technician set-up mode. The kg, lb and oz modes
can also be enabled or disabled in the user setup mode. The unit specifi cations for each of the two
capacities are in the following tables.
The CPC-2000 contains a single 6 V, 4 Ah rechargable battery good for up to thirty six hours of con-
tinuous use. It takes about eight to fourteen hours to recharge the battery with the AC adaptor. The
scale may be operated while the battery is recharging. Use only the AC adaptor supplied or an
adaptor of the same output characteristics.
The scale has an automatic-off feature which will turn off the scale after two, three, four or five minutes
of non-use, unless the feature is disabled. The time delay for the automatic-off, including full dis-
able, is set in the technician set-up mode (see section II.)
Capacity Increment Accuracy Maximum Tare
2 kg 0.001 kg 0.001 kg 2 kg
5 lb 0.05 oz 0.05 oz 5 lb
4 lb 0.002 lb 0.002 lb 4 lb
80 oz 0.05 oz 0.05 oz 80 oz
Capacity Increment Accuracy Maximum Tare
4 kg 0.002 kg 0.002 kg 4 kg
10 lb 0.1 oz 0.1 oz 10 lb
10 lb 0.005 lb 0.005 lb 10 lb
160 oz 0.1 oz 0.1 oz 160 oz
II Setting the Scale Functions
Technician Setup Mode
All of the scale keywords and the calibration software are accessible
through the technician setup mode. To enter the mode turn the
scale off, remove the scale platform and turn the scale upside
down.
WARNING! Do not place the scale on the platform or on the load
cell assembly. This can overload and damage the load cell.
Next, remove the four housing screws. The four housing screws
are the outermost two screws to the front of the scale and the
innermost two screws to the rear of the scale. Place the scale
back on it’s feet.
+
+
+
+
+
+
++
++++

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CPC-2000 Technical Manual
II Setting the Scale Functions
Technician Setup Mode
From the front, rotate the upper housing clockwise (to the right) until it rests on the table. Be careful not
to stress the wires that connect the main circuit board (in the upper housing) to the power board and
load cell (in the lower housing).
Place the platform back on the load cell assembly, power the scale on and press the technician setup
mode switch on the back of the main circuit board. The scale should indicate, “Set” followed by,
“Unit”.
The scale is now in the technician setup mode. From here, various settings can be altered and the
scale can be calibrated as detailed in “Setting Keywords” and in “Calibrating the Scale” below. Exit
the technician setup mode at any time by pressing the
ON/OFF
key for about five seconds.
After exiting the technician setup mode, remove the platform from the load cell assembly, return the up-
per housing to the original position taking care not to pinch the wiring between the upper and lower
housing. Do not allow the wiring to rub against the upper load cell assembly. Replace the four up-
per housing screws and firmly tighten them. Place the scale back on it’s feet and place the platform
back on the scale.
Observe the supporting columns of the platform from the front and from the side. If the colums rub
against the upper housing, loosen the four upper housing screws, adjust the upper housing so that
it does not contact the platform columns and firmly tighten the four upper housing screws.
WARNING! Do not place the scale on the platform or on the load cell assembly. This can overload
and damage the load cell.
2
Technician Setup
Mode Switch

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CPC-2000 Technical Manual
II Setting the Scale Functions
Setting the Keywords
The scale keywords can be set to select which units (kg, lb, oz or lb-oz) are toggled when the
UNIT
key is pressed, to change the duration of the auto-off function, to disable the auto-off function and
to change the capacity of the scale when a different load cell and front mask are installed. The data
transmission keywords “tran” and “t.rate” do not function on the CPC-2000.
The kg, lb and oz modes, and the auto-off function can also be set in the user setup mode. Enter the
user setup mode by pressing the
TARE
key for about three seconds while the scale is on. The
display will briefly show “SET” followed by “UNIT”. Exit the user setup mode by pressing the
N
G
key while “END” is selected.
From the “UNIT” indication, use the
N
G
key as an ENTER or RETURN key, and use the
UNIT
key
as a SELECT or TOGGLE key. Refer to the setup chart on the following page. Any unit that is se-
lected “ON” will be displayed in sequence during normal operation when the
UNIT
key is pressed.
Mixed units, such as the combined pound and ounce, are not allowed on legal-for-trade scales
under NTEP regulations. If your scale is to be used as a legal-for-trade scale, the lb-oz mode must
be disabled.
The auto-off setting selects the duration, in seconds, after which the scale will automatically turn itself
off if it is not being used. If “OFF” is selected, the auto-off function will be disabled. The “tran”
and “t.rate” keywords do not function on the CPC-2000. The “CAP” setting selects the capacity, in
kilograms, of the load cell installed in the scale. Only the 2 kg and 4 kg capacities are available on
the CPC-2000. Pressing the
N
G
key while “END” is displayed will cause the scale to enter the
calibration program.
Exit the technician setup mode at any time by pressing the
ON/OFF
key for about five seconds. This will
turn the scale off. Press the
ON/OFF
key again to return to normal operating mode.
3

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CPC-2000 Technical Manual
II Setting the Scale Functions
4
TARE
UNIT UNIT
UNIT
UNIT
N
G
N
G
UNIT UNIT UNIT UNIT UNIT
UNIT UNIT
Press for three seconds.
UNIT
N
G
Enter the calibration program.
UNIT
UNIT UNIT UNIT
UNIT
UNIT UNIT UNIT
N
G
N
G
N
G
N
G
kg lb-oz lb oz
N
G
N
G
UNIT UNIT UNIT UNIT
UNIT
UNIT UNIT UNIT
N
G

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CPC-2000 Technical Manual
5
II Setting the Scale Functions
Calibrating the Scale
WARNING! Calibration should only be performed by a qualified scale technician. Beware of the haz-
ard of electric shock. Never work on powered circuits.
Enter the technician setup mode, select “END” and press the
N
G
key to enter the calibration pro-
gram. The scale will display raw counts. Press the
UNIT
key to select either pound or kilogram
calibration weights. With an empty platform on the load cell assembly, press the
TARE
key. The
scale should read “0”. If “0” is not displayed, then press the
TARE
key again until “0” is displayed.
Place either 2 kg or 5 lb (depending on the units selected above) on the scale platform. Wait for the
counts to stabilize and press the
TARE
key again. The scale should briefly indicate either 2 kg or
5 lb and then power off. Turn the scale back on and verify that it is reading accurately. If not, then
repeat the calibration procedure.

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CPC-2000 Technical Manual
6
III Troubleshooting
The scale can check various functions automatically. When a problem is detected, the following mes-
sages will be displayed. If you take the steps described below but the problem is not fixed, the scale
needs to be serviced by a qualified scale technician.
Low battery indication. Connect the AC adaptor to the scale
and recharge the battery. This takes approximately 8 to 14
hours. The scale can be used while it is recharging. If the
battery does not charge, see a qualified scale technician.
Power on counts are greater than calibrated zero plus 10%.
Remove weight from the platform and press the
ON/OFF
key,
if necessary. If no weight is on the platform, calibration or
service is required.
Power on counts are less than calibrated zero minus 10%.
This generally indicates that the platform is not on the scale
or that something is wedged between the platform and the
scale body. Replace the scale platform, remove any obstruc-
tions under the platform and press the
ON/OFF
key, if neces-
sary. Otherwise, calibration or service is required.
Overload condition. Remove weight that is greater than the
scale capacity from the platform. If no weight is on the plat-
form, calibration or service is required.
Underload condition. Generally indicates that something is
wedged between the platform and scale body. Remove the
obstruction. If there is no obstruction, calibration or service is
required.
Calibration span is too high. Calibration or service is re-
quired.
EEPROM R/W error. Service is required.

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CPC-2000 Technical Manual
IV Wiring Diagram
7
+
LED
MAIN BOARD
KEYPAD
BAT DC JACK RED
BLUE
WHITE
GREEN
BLACK
RED
RECHARGEABLE
BATTERY6 V, 4Ah
LOAD CELL
POWER
BOARD
DC JACK
E+
E-
S+
S-

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CPC-2000 Technical Manual
V Parts List
8

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9
VI Parts List
ITEM PART NUMBER DESCRIPTION QTY.
1 CHA-1595-000010 Stainless Steel Base 1
2 CHA-1595-000020 Adjustable Feet 4
3 CHA-1595-000030 Screw M4 x10 12
4 CHA-1595-000040 Rechargeable Battery 1
5 CHA-1595-000050 Battery Holder 1
6 CHA-1595-000060 Display / CPU Board 1
7 CHA-1595-000070 Load Cell Assembly 4 lb / 2 kg 1
CHA-1595-000080 Load Cell Assembly 10 lb / 4 kg 1
8 CHA-1595-000090 Wire Clip 1
9 CHA-1595-000100 Hex Screw M3 x 6 1
10 CHA-1595-000110 Rubber Pad 4
11 CHA-1595-000120 Hex Nut M4 2
12 CHA-1595-000130 Power Board 1
13 CHA-1595-000140 Stainless Steel Upper Housing 1
14 CHA-1595-000150 Holder, Bubble Level 1
15 CHA-1595-000160 Bubble Level 1
16 CHA-1595-000170 Front Mask 4 lb / 2 kg 1
CHA-1595-000175 Front Mask 10 lb / 4 kg 1
17 CHA-1595-000180 Stainless Steel Platform 1