Citizen CTB-150, CTB-300, CTB-600 Operating Manual

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CTB serial bench scale service manual

UGCTB-E1.0

Table of Contents

SECTION 1 INTRODUCTION…………………………………………………………1

S E C T I O N 2 S P E C I F I C A T I O N S … … … … … … … … … … … … … … … … … … … … . . … 2

S E C T I O N 3 I N S T A L L A T I O N … … … … … … … … … … … … … … … … … … … … … … … 3

S E C T I O N 4 K E Y D E S C R I P T I O N S … … … … … … … … … … … … … … … … … … … … 4

S E C T I O N 5 D I S P L A Y S … … … … … … … … … … … … … … … … … … … … … … … … … 5

S E C T I O N 6 O P E R A T I O N … … … … … … … … . … … … … … … … … … … … … … … … . … 6

6 . 1 Z e r o i n g t h e d i s p l a y … … … … … … … … … … … … … … … … … … … … … … … … … . 6

6 . 2 T a r i n g … … … … … … … … … … … … … … … … … … … … … … … … … … … … … . . … … 6

6 . 3 W e i g h i n g a s a m p l e … … . … … … …… … … … … … …… … … … … … …… . … … … … . 6

6 . 4 P a r t s c o u n t i n g…………………………………………………………………………6

6 . 5 C h e c k - weighing…………………………………………………………………….7

6 . 6 A c c u m u l a t e d t o t a l … … … … … … … … … … … … … … … … … … … … … … … … … … 8

6.7 Net/gross change …………………………………………………………………….8

S E C T I O N 7 P A R A M E T E R S … … … … … … … … … … … … … … … … … … … … … … 9

S E C T I O N 8 B A T T E R Y O P E R A T I O N … … … … … … … … …………………………..…11

S E C T I O N 9 R S - 2 32 O U T P U T … … … … … …… … … … … … … … … … … …… … … … . 1 2

S E C T I O N 1 0 C A L IB R A T IO N … … …… … … … … … … … … … … …… … … … … . . … … . 1 3

SECTION 1 1 T E C HN I C AL P A R A M E T E S … … … … … … … …… … … …… … … …… . 14

SECTION 12 TROUBLE SELFCHECKING…………………………..…….……... 15

SECTION 13 TROUBLESHOOTING………………………………….………………16

13.1 No power………………………………………………….…………….…………. 16

13.2 No display…………………………………………………………..………..……. 17

13.3 Can’t charge the battery…………………………………………..………………18

13.4 Can’t weighing……………………………………………………………………. .19

13.5 Reading jump……………………………………………………………..………..20

13.6 Keyboard can’t work……………………………………………………………….20

CTB serial bench scale service manual

III

SECTION14 CHANGE PARTS PROCESS…………………………………………...21

14.1 Replace main board……………………………………………………….……....21

14.2 Replace load cell……………………………………………………..……………21

14.3 Replace MPU…………………………………………….………………………...22

14.4 Replace battery………………………………………………….…………………22

SECTION15APPENDIX…………………….………………………………………..…23

15.1 Schematic (main)…………………………………………………………….….…23

15.2 Schematic (display)………………………………………..………….……..……24

15.3 Parts drawing…………………………………………….…………..…….……...25

15.4 Parts list…………………………………………………….……………….……...26

15.5 Error codes…………………………………………………………………………27

15.6 Numeric and alphabetic characters displayed on LCD……………….……….27

CTB serial bench scale service manual

SECTION 1 INTRODUCTION

The CTB series of bench scale provides an accurate, fast and versatile series of general purpose weighing scale with counting and check-weighing functions.

There are 3 series scales within the range, the platform size from 420mm x 520mm , the capacity range from 150lb to 600lb.

All the keypads are sealed, color coded membrane switches and the displays are large easy to read liquid crystal type displays (LCD). The LCD’s are supplied with a backlight.

All units include automatic zero tracking, audible alarm for pre-set weights, automatic tare, and an accumulation facility that allows the individual weights to be stored and recalled as an accumulated total.

CTB serial bench scale service manual

SECTION 2 SPECIFICATIONS

Model CTB-150 CTB-300 CTB-600

Platform size 420mm x 520mm 420mm x 520mm 420mm x520mm

Capacity 150lb 300lb 600lb

Resolution 1:3000

Interface RS-232 Output Optional (standby)

Stabilisation Time 1 Seconds typical

Operating Temperature

5°C - 35°C / 41°F - 95°F

Power supply External AC adapter, 9V 800mA

Calibration Automatic External

Display 6 digits LCD digital display with 24mm high digits

Balance Housing Indicator ABS Plastic

Load cell drive voltage

Max 5V/150mA

Load cells Up to four 350 ohms cells

CTB serial bench scale service manual

SECTION 3 INSTALLATION

GENERAL INSTALLATION

The scales should be sited in a location that will not degrade the accuracy.

Avoid extremes of temperature. Do not place in direct sunlight or near air conditioning vents.

Avoid unsuitable tables. The tables or floor must be rigid and not vibrate. Do not place near vibrating machinery.

Avoid unstable power sources. Do not use near large users of electricity such as welding equipment or large motors.

Avoid high humidity that might cause condensation. Avoid direct contact with water. Do not spray or immerse the scales in water.

Avoid air movement such as from fans or opening doors. Do not place near open windows.

Keep the scales clean.

Do not stack material on the scales when they are not in use.

INSTALLATION OF CTB SERIES

The pillar is attached to the base using a bracket that must first be attached to the base frame using the 4 bolts supplied. The Pillar is secured to the bracket using 2 set screws. The cable from the base to the indicator module is run through the tube, out through the plastic support at the top. Excess cable can be stored within the tube.

The CTB Series comes with a stainless steel platform packed separately. Place the platform in the base.

Level the scale by adjusting the four feet. The scale should be adjusted such that the bubble in the spirit level is in the centre of the level and the scale is supported by all four feet. If the scale rocks readjust the feet.

Attach the indicator module to the pillar by sliding it over the bracket with the flanges engaged in the groves on the base. Attach the AC power adapter to the connector on the back of the indicator.

CTB serial bench scale service manual

SECTION 4 KEY DESCRIPTIONS

Zero or

Set the zero point for all subsequent weighing. The display shows zero.

A secondary function

, of "Enter" key when setting parameters or other functions.

Tare or Tares the scale. Stores the current weight in memory as a tare value, subtracts the tare value from the weight and shows the results. This is the net weight. Entering a value using the keypad will store that value as the tare value. A secondary function +, of incrementing the active digit when setting a value for parameters or other functions.

Smpl or Enter counting mode from weighing mode. Shift unit weight, counts and total weight when counting mode. Move the active digit right when setting values for other functions.

The second function, when the scale self-check press the key, it will show ”CAL X”, it is an arithmometer (COUNTER) for the times of calibration is successful.

N/G

Used to select the weight model of the scale. If the scale has tared, switch to the mode of net weight or gross weight. Move the active digit left when setting values for other functions.

The second function, when the scale self-check press the key, it will show “opt X”, it is an arithmometer (COUNTER) for the times of parameter setting.

Func or F Used to select the function of the scale. If the scale is weighing it will select parts counting. Of it is not in weighing mode it will return the user to weighing. Secondary function ( C ) , is to act as a clear key when setting values for parameters or other functions.

Print or To print the results to a PC or printer using the optional RS-232 interface. It also adds the value to the accumulation memory if the accumulation function is not automatic. Secondary function (ESC) , is to return to normal operation when the scale is in a parameter setting mode.

ON/ OFF or Turn on or off the power.

CTB serial bench scale service manual

SECTION 5 DISPLAYS

The LCD display will show a value and a unit to the right of the digits. In addition there are labels for TARE, GROSS weight, Zero and for Low battery

Center of Zero Indication

/pcs

CTB serial bench scale service manual

SECTION 6 OPERATION

6.1 Zeroing The Display

You can press the ZERO/ENTER key at any time to set the zero point from which all other weighing and counting is measured, within set % in 0-Range parameter from power up zero. This will usually only be necessary when the platform is empty.

When the zero point is within “CENTRE OF ZERO” range display will show the indicator for “zero”.

The scale has an automatic rezeroing function to account for minor drifting or accumulation of material on the platform. However you may need to press the ZERO/ENTER key to rezero the scale if small amounts of weight are shown when the platform is empty.

6.2 Taring

Zero the scale by pressing the ZERO/ENTER key if necessary.

Place a container on the platform, a value for its weight will be displayed.

Press the TARE key to tare the scale. The weight that was displayed is stored as the tare value and that value is subtracted from the display, leaving zero on the display. The "TARE" indicator will be on. As product is added only the weight of the product will be shown. The scale could be tared a second time if another type of product was to be added to the first one. Again only the weight that is added after taring will be displayed.

When the container is removed a negative value will be shown. If the scale was tared just before removing the container this value is the gross weight of the container plus all product that was removed. The zero indicator will also be on because the platform is back to the same condition of “CENTER OF ZERO” range.

6.3 Weighing a sample

To determine the weight of a sample first tare the empty container then place the sample in the container. the display will show the weight and the units of weight currently in use.

6.4 Parts Counting

When the scale is showing weight, pressing the SMPL key will start the parts counting function.

CTB serial bench scale service manual

Before beginning, tare the weight of any container that will be used, leaving the empty container on the scale. Place the number of samples on the scale. The number should match the options for parts counting, 10, 20, 50, 100 or 200 pieces.

Press the SMPL key to begin. The scale will show "SP 10" asking for a sample size of 10 parts. Change the sample size by pressing the TARE/! key. the display will cycle through the options: 10,20, 50, 100, 200 and back to 10.

Press the SMPL key when the number matches the number of parts used for the sample. As more weight is added the display will show the number of parts (pcs).

Press the FUNC key to return to normal weighing.

6.5 Check-Weighing

6.5.1 About check-weighing

Check-weighing is a procedure to cause an alarm to sound when the weight on the scale meets or exceeds values stored in memory. The memory holds values for a high limit and a low limit.

Check range: set hi-limit and low-limit as different value, also hi-limit value is larger than low-limit.

Check key point:

set hi-limit and low-limit as same value.

Check mode 2:

When check range, the display will show OK and the beeper will sound when the weight is between the limits. When check key point, the display will show Ok and the beeper will sound when the weight is under the limits.

Check mode 3:

When check range, the display will show OK and the beeper will sound when the weight is out of the limits. When check key point, the display will show Ok and the beeper will sound when the weight is over the limits.

6.5.2 Set limits Press F key, it will display “F0 H-L”, press ZERO key to enter, use TARE key to select “SET HI” or “SET LO”, press ZERO key to enter, use SMPL key to move active digit, use TARE key to change value, use F key to clear value. After you enter the value, press ZERO key to sure, press Print/M+ key to escape.

CTB serial bench scale service manual

6.5.3 Set check weighing mode Press F key to enter setting mode, press TARE until display show “F4 OFF”, press ZERO key to enter, press TARE key until display show “BEEP”, press ZERO key to enter, press TARE key to select BP 2(check mode 2), BP3 (check mode 3), BP1(not sound), press ZERO key to sure, press PRINT/M+ key to escape.

6.5.4 NOTE The weight must be greater than 20 scale divisions for the check weighing to operate.

To disable the Check-Weighing function enter zero into both limits by pressing the FUNC key when the current limits are shown then pressing ZERO/ENTER to store the zero values.

6.6 Accumulated Total

The scale can be set to accumulate manually by pressing the PRINT key. See the PARAMETERS Section for details of selecting the method using function "F5 P RT". The accumulation function is only available when weighing. It is disabled during parts counting.

The weight displayed will be stored in memory when the PRINT key is pressed and the weight is stable.

The display will show "ACC 1" and then the total in memory for 2 seconds before returning to normal. If the optional RS-232 interface is installed the weight will be output to a printer or PC( this type machine has no print function).

Remove the weight, allowing the scale to return to zero and put a second weight on. Press the PRINT key, the display will show "ACC 2" and then the new total.

Continue until all weights have been added. To view the totals in memory press enter the PARAMETER SECTION and use function "F1 TOL". See below.

6.7 Net/gross change When you weigh, press N/G key , you can check net weight and gross weight.

CTB serial bench scale service manual

SECTION 7 PARAMETERS

The scale has 6 parameters that can be set by the user plus a method of entering the calibration section.

To set parameters press the FUNC key.

The display will show the first function, "F0 H-L". Pressing the TARE/+ will cycle through the other functions. Pressing ZERO/ENTER will allow you to set the function. It may be necessary to either use TARE/+ or set a value using the SMPL/" key to move the active digit and then using the TARE/! key to increment a digit, followed by the ZERO/ENTER key to enter the value. Use the PRINT/ESC key to leave a parameter unchanged.

For example when the display shows “F0 H-L” press the ZERO/ENTER key to begin.

The display will show “Set Lo”, press the ZERO/ENTER key to set the low limit, or press the TARE/+ to skip to the next parameter, “Set Hi” for setting the high limit.

After pressing the ZERO/ENTER key to set a limit, use the the SMPL" keys to change the flashing digit, then use the TARE/! key to increment the flashing digit. Continue to the next digit and set it as needed.

When all digits have been set press the ZERO/ENTER key to store the value. The display will go back to the parameter just set, i.e. “Set Lo”. Advance to another parameter if needed or press the PRINT/ESC key to return to weighing.

CTB serial bench scale service manual

FUNCTION MENU SETTINGS

FUNCTION SUB-FUNCTION DESCRIPTION

DEFAULT VALUE

SEt Lo

Set a value for the Low limit. 000.000

F0 H-L

SEt HI

Set a value for the High Limit. 000.000

to CLr

Clears the accumulation memory without printing the results.

to P-C

Prints the Accumulation memory total and then clears the memory.

F1 toL

to Prt

Prints the Accumulation Total, does not clear the memory.

Set the backlight to be on, automatic or off,

EL on EL Au EL off

EL Au

beep

Set the beep mode.(check weighing mode 2, check weighing mode3, no beep)

F2 off

sleep

Set the time of automatic sleep: 1,5,10,30 or OFF

Prog Pin

Enter the programming and calibration menus by entering the correct password. See the section

11.

CTB serial bench scale service manual

SECTION 8 BATTERY OPERATION

The weighing indicator can be operated from the battery if desired. The battery life is approximately 100 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 10 hours 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 Red the battery is nearly discharged and yellow 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.

CTB serial bench scale service manual

SECTION 9 RS-232 OUTPUT (opt ional)

The CTB Series of scales can be ordered with an optional RS-232 output.

Specifications:

RS-232 output of weighing data ASCII code 8 data bits No Parity

Connector: 25 pin d-subminiature socket Pin 2: Output Pin 3: Input, not used at this time Pin 5: Signal Ground

Data Format for normal weighing operations, parts counting or recalling of totals from memory will all be different. Examples follow:

Normal Output

When parts counting the weight, unit weight and count will be printed.

When recalling the Total weight stored in the accumulation memory the output format is:

GS 12.340kg GS for Gross weight, NT for net weight and a unit of weight No.. 1 This number increments every time a new value is stored in memory Total 12.340kg The total value stored in memory <lf> Includes 2 line feeds

*************** A line of stars is shown <lf> Includes 1 line feed TOTAL No. 5 Wgt 21.455kg . ***************

GS 12.340kg GS for Gross weight, NT for net weight and a unit of weight U.W. 123.4g/pcs The average piece weight computed by the scale PCS 100pcs The number of parts counted <lf> Includes 2 line feeds

<lf>

CTB serial bench scale service manual

SECTION 10 CALIBRATION

Turn the power off. During the counting from 9 to 0 press the FUNC/C key.

The display will show "CAL " for a few seconds. While it is showing "CAL " press the UINT , PRINT and TARE keys in sequence to enter the Calibration section. The display will show "unLoAd".

Remove any weight from the platform. Press the ZERO/ENTER key.

The display will show "LoAd". Place the calibration weight on the scale. Press the ZERO/ENTER key. If the calibration weight is right, the display will show “PASS”, If the calibration weight is unapt, the display will show “FAIL H” or “FAIL L”. the calibration is not acceptable. If the calibration is acceptable the display will return to normal. If an error message is shown try calibration again as a disturbance may have prevented a successful calibration.

If the problem persists then contact your dealer.

SECTION 11 TECHNICAL PARAMETERS

Press F key when normal weighing mode, display shows “F0 H-L”, press TARE key until display shows “P ROG”, press ZERO key, display shows “PIN”, You can press unit PRINT TARE key to enter setting mode, press Tare key to select parameter, press Zero key to sure, press Print key to escape. Before you set parameters, please short the K1.

FUNCTION

SUB-FUNCTION DESCRIPTION

CTB serial bench scale service manual

AZN 0

This option is used to select the auto zero tracking. Options : 0.25d, 0.5d,

0-AUTO

This option is used to select the Initial zero setting range (mechanism) when turn the indicator. Options : 0%, 2%, 5%, 10%, 20%

P1 REF

0- RANGE

This option is used to select the (SAZSM) manual zero range when press the ZERO key. Options: 2%, 4%, 10%, 20%,

C AP

This display will show xxxxxx for setting the capacity.

CAL

Calibrate, see detail in section 10.

P 2 CAL

CNT

This display will show xxxxxx for indicating the internal counts.

P-AUTO

Automatic print setting, when the weight is stable, the data will be printed automatic

P-PRT

Manual print setting, when the weight is stable, press the PRINT key, the data will be printed.

P3 P RT

P cont

Connect PC, the data will be send to PC

AUDIT TRAIL COUNTER :

CALIBRATION:

When the scale self-check press the SMPL/ key, it will show ”CAL X”, it is an Audit trail counter for each Successful CALIBRATION.

PARAMETER (OPERATIONAL) COUNTER :

When the scale self-check press the N/G key, it will show “opt X”, it is Audit trail counter for any change in parameter setting.

SECTIOIN 12 TROUBLE SELF CHECKING

Problem Possible cause Common solutions

Display is blank, No turn on test

Mains power is turned off Power supply not plugged in Power supply faulty Internal battery not charged Display turned off

Check power is going to the scale and switch is on. Verify the voltage going to the scale matches the power supply labels on the power module or scale.

CTB serial bench scale service manual

Display blank after turn on test, Error message Display is locked

Pan not installed Unstable weight Load cell damaged Mechanics damaged

Check the pans are installed correctly. Try turning the scale on again.

OL or FULL appears on display

Maximum capacity exceeded Load Cell or mechanics damaged Power supply faulty

Check the pans are installed correctly. Try turning the scale on again.

UL or NULL displayed

Weight on scale below permissible limit Pan has been removed Pan support not seated properly Power supply faulty Load Cell or mechanics damaged

Check the pans are installed correctly. Try pressing Zero key. Try turning the scale on again.

Display is unstable

Drafts or air currents Obstruction under pan Sample is moving (animal weighing) Vibrations through table Temperature changed dramatically Power supply faulty

Verify the scale is in a acceptable location and on a good table. Verify the power supply is correct for the scale.

Weight value incorrect

Calibration error, Recalibrate Linearity error, set Linearity Unit calibrated with inaccurate weight Balance not level Obstruction between sample and cover Wrong unit of weight displayed

Calibrate again, paying special attention to the mass used, the stability of the scale, and the weighing units required. If linearity can be set by the user it will be described in the user manual. Check pan is installed correctly. Verify installation is acceptable.

Cannot use Full Capacity

Over load Stops hitting pan support or hitting bottom of load cell Shipping screw not removed if applicable Electronic problem on A/D Parameters set incorrectly Load Cell or mechanics Damaged

Look for obstruction under pan, shipping screws, and verify pan installation. Check the weighing units used.

Not Linear

Overload stops hitting too soon Load cell or mechanics damaged A/D damaged

Look for obstruction under pan, shipping screws, and verify pan installation. If linearity can be set by the user it will be described in the user manual.

Off Center Adjust mechanics

Look for obstruction under pan,

CTB serial bench scale service manual

Loading error

Overload Stops not correct Load Cell damaged

shipping screws, and verify pan installation.

Battery will not charge

Mains voltage not present or too low Charging circuit failure Battery Failure

Verify the batteries are rechargeable types. Check power supply voltage is correct.

SECTIOIN 13 TROUBLESHOOTING

13 2 no display

START

T10

output

CHK T10 and around circuit

Battery

Charging the battery

immediately

CHK

pin9

High level when power

CHK power

switch

Replace power switch or

CHK ST and around

CHK U1 and around circuit

CHK ST

(11.0592MHz)

CHK U1 and around circuit

START

CHK LCD

break?

Replace

LCD

CTB serial bench scale service manual

13 3 Can’t charge the battery

START

Battery bad?

(battery

Replace battery

Fuse open?

Replace the fuse and solve

the problem (like

Cut the circuit,

then CHK

transformer

Replace

Open

pin11/12,

CHK BR1

output

CHK BR and around

Restore the circuit,

CHK U5 pin2

output>7V

CHK M/B U5 and around

CHK M/B D1, R7 and around circuit

N Y

CTB serial bench scale service manual

13 4 Can’t weigh

START

CHK whether can

show internal

Add load on

pan, CHK

Do calibrate

CHK load cell input circuit

CHK M/B

AU1

CHK power circuit

Add load on pan,

CHK output

between AU1 pin1

and pin2 signal

Check load cell

CHK AU1 and around circuit

N N

CTB serial bench scale service manual

13 5 unstable

13 6 Can’t use keyboard

START

OK after

Dispel humidity

Load cell

and bracket

touch

CHK M/B AU1 and around

N N

Solve touch problem

CTB serial bench scale service manual

Note: M/B means main board, D/B means display board.

SECTION 14 CHANGE PARTS PROCESS

14 1 Replace main board

At first, release indicator

from indicator bracket, like

picture, then release 6 pcs

screw from back cover of

the indicator use cross

srew driver. Then, open the

back cover, release 4 pcs

screw of main board,

release main board

carefully, pull out all

connector on the main board, then you can bring

out main board carefully. Then install the new main

board, plug all connector at

last ATTENTION CH3.96 4P connector (for

START

Find the line for

useless key, short

and open it, CHK the

scale accept this

Replace keyboard

CHK U1 and around circuit

CTB serial bench scale service manual

power) must be pulled out at first and plug at last After check anything try to turn

on the power if anything is OK close the back cover replace main board

completely.

14 2 replace load cell

At first, use internal hexagon screw driver release 4 pcs screw from upper bracket, remove upper bracket, then release 4 pcs screw from bottom

bracket, by this way, you can remove load cell now. Use iron to solder cable for load cell, remove cable from connector, then pull cable from pole. Bring new load cell, let cable through

pole, solder the cable to connector. Now, you can fix 8 pcs internal hexagon screw again (Attention: fix tight enough as you can ). Then you can check and adjust corner and overload stop use file and internal hexagon screw driver. After check anything, try to turn on the power and show the internal counts, if internal counts looks OK, close the pan, change load cell completely.

14 3 replace MPU

At first, release indicator from indicator bracket, like picture, then release 6 pcs screw from back cover of the indicator use cross srew driver. Then, open the back

cover, pull of the connector for power (CH3.96 4P), use special IC kit or minus screw

driver to put up the MPU from DIP40 socket (Attention: please don’t let the IC pin tilt), then use the new MPU plug into DIP40 socket (Attention: please

note the gap direction), after check anything is OK, plug the power connector (CH3.96 4P), try to turn on the power, if scale work correctly, replace MPU completely.

CTB serial bench scale service manual

14 4 replace battery

At first, release 4 pcs screw of the battery cover. use cross screw driver, Then, open the battery cover, you can bring the battery from scale, use iron solder off wire, bring new battery, use iron to solder the battery, (Attention: red line to positive electrode, black line to minus electrode), after check anything, plug the connector for power and try to turn on the power, if scale work correctly, replace battery completely.

CTB serial bench scale service manual

SECTION15 APPENDIX

15.1 SCHEMATIC (main)

AST2

4.9152

VCCE+

AC10

0.022UF

AC12

0.022UF

AR8

10K

AR6

10K

AC11

0.022UF

S+

AR7

10K

AR5

10K

AC13

0.022UF

S-

AC9

10K

AR2

104

AR1

10K

E+

A1N2+

VREF+

VREF-

A1N1+

A1N1-

A1N2-

VA+5VD+

OSC2

OSC1

SDI

SDO

SCLK

VA-6DGND

AU1

CS5532

1 2 3 4

POWER

BR1

25V/470UF

VAC

3.9K

INI

COMP

V+

VOUT

V-

VREF

N.I.

LM723CN

T2 TIP31C

100K

C10 201

10K

VCH

VAC

1 2 3 4 5

LOADCELL

SS+ GND EE+

D2 IN4736

R9 10K

T3 9014

R10

10K R11

100K

T5 9015

R14

100K

R12

T4 9015

R13 1K

VAC

VCH

LED

T7 8550

R21

5.1K

T6 9014

AC12 100UF/25V

VOUT

VIN

GND

T10 LM2931

VOUT

VIN

GND

T8 LM2931

C18

470UF/25V

AC4

470UF/25V

C17

104

DVCC

AVCC

R18

1.5K

R17

20K

KEY

R20

5.1K

R16

R19

3.9K

RST

CHECK

VGND

AC14

6.8UF/25V

AC6

6.8UF/25V

AC8

100UF/25V

SDI SDO

SCLK

R23

9014

C13

0.047uf

R22 3K

R23 100

C14

6.8uf/16v

TR1

OUT

GND

2 1

EL1

VCC

EL2

CTB serial bench scale service manual

15.2 SCHEMATIC (display)

SEG7

SEG6

SEG4

SEG3

SEG5

SEG2

SEG1

SEG0

SEG8

DATA

VSS

OSC0

OSC1

VLCD

VDD

IRQ

COM0

COM1

COM2

COM3

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG24

SEG23

SEG25

SEG27

SEG28

SEG29

SEG30

SEG31

SEG26

1621B

LCD

SEG7 SEG6

SEG4

SEG5

SEG3 SEG2 SEG1

SEG0 SEG28 SEG29 SEG30 SEG31

SEG28 SEG29 SEG30 SEG31

SEG27

SEG26

SEG25

SEG24

SEG23

SEG22

SEG27 SEG26 SEG25

SEG22

SEG24 SEG23

COM0

COM1

COM2

COM3

COM3 COM2 COM1 COM0

R30

VCC

EA/VP

RESET

INT0

INT1

P10/T

P11/T

P12

P13

P14

P15

P16

P17

P00

P01

P02

P03

P04

P05

P06

P07

P20

P21

P22

P23

P24

P25

P26

P27

PSEN

ALE/P

TXD

RXD

8032

1 2 3 4 5 6 7 8 9

RP1

103G

RP2

103G

VCC

1 2 3 4 5 6 7 8 9

RP3

103G

RESET RXD

TXD

ST1

11.0592

C2 20P

C1 20P

VCC VCC

VCC

SCL

SDA

VSS

VCC

HT24LC02

KEEP

1234567

KEY

KEY5

KEY4

KEY3

KEY2

KEY1

R22KT1

9014

BUZZ

VCC

KON

10K

VCC

CS RD WR DATA

1621.CS RD

DATA

SDA SCL WP

25V/10UF

VCC

RXD

TXD

C1+

V+

C1-

C2+

C2-

V-

T2OUT

R2IN

VCC

GND

T1OUT

R1IN

R1OUT

T1IN

T2IN

R2OUT

MAX232

VCC

1 2 3 4

SERIAL

U3 LM358

LM358

R26

330K

R27

240K

R28 20K

R29 20K

R24

300K

R25

220K

VAC

VCC

PCH1

PCH2

C19

10UF/10V

R15

10K

VCC

5532.CS

5532.SDI

5532.SCLK

5532.SDO

PCH1 PCH2

CTB serial bench scale service manual

15. 3 PARTS DRAWING

CTB serial bench scale service manual

15. 4 PARTS LIST

Parts No. Parts name QTY Material Spec

1 overlay 1 PC

2 iron plate 1 iron

3 Top cover 1 ABS

4 Main PCBA 1

5 washer 4 EPDM

6 screw 4 S18C M4 x 8

7 Battery holder 1 SUS#304

8 Battery 1 Lead acid 6V/4Ah

9 Bottom cover 1 ABS

10 washer 6 EPDM

11 screw 6 S18C M4 x 20

12 Neck parts 1 1 ABS

13 Neck parts 2 1 ABS

14 Neck parts 3 1 ABS

15 nut 1 S18C M6 x 3.5

Load cell upper supporter

1 Al

17 Load cell 1 Al

18 Pole 1 SST

19 Bottom bracket 1 Al

20 Overload stop screw 4 S18C M8 x 7

21 Pole bracket Q235

22 Mat for pole steel 189 x 132 x 0.8

23 Spring washer 3 steel 10 x 6 x 2

24 internal hexagon screw 3 35# M6 x 12

25 feet 4 Rubber

26 internal hexagon screw 4 35# M12 x 45

27 internal hexagon screw 4 35# M12 x 45

28 washer 1 S18C 12 x 7 x 1.2

screw

1 S18C M3 x 20

30 Neck parts 4 1 ABS

31 pan 1 SST 420 x 520

32 washer 2 EPDM 8 x 3.5 x 1.2

33 screw 2 S18C M3 x 8

CTB serial bench scale service manual

15. 5 ERROR CODES

ERROR CODES

DESCRIPTION RESOLUTION

- - - -

Over range Remove weight from the scale.

If the problem persist contact your dealer for assistance.

Err 1

Date Setting Error Enter date using correct format and reasonable

values. Format: yy:mm:dd

Err 2

Time Setting Error Enter time using correct format and reasonable

values. Format: hh:mm:ss

Err 4

Zero Setting Error The scale was outside the normal zero setting

range either when it was turned on or when the ZERO key was pressed. Remove weight from the scale and try again. Use the TARE key to set the display to zero value. If the problem persist contact your dealer for assistance.

Err 6

A/D out of range The values from the A/D converter are outside the

normal range. Remove weight from the scale if overloaded, make sure the pan is attached. Indicates the load cell or the electronics may be faulty. If the problem persist contact your dealer for assistance.

Err 9

Unstable, can’t return to zero

When turn on the power, if internal counts is not stable, display will have “Err 9”, please check the platform and load cell. If the problem persist contact your dealer for assistance.

15. 6 NUMERIC AND ALPHABETIC CHARACTERS DISPLAYED ON LCD

0 1 2 3 4 5 6 7 8 9

A B C D E F G H I J

K L M N O P Q R S T

U V W X Y Z

Citizen CTB-150, CTB-300, CTB-600 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual