Download CTB Series - Scale Manuals
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CTB serial bench scale service manual UGCTB-E1.0 Table of Contents SECTION 1 INTRODUCTION…………………………………………………………1 SECTION 2 SPECIFICATIONS……………………………………………………..…2 SECTION 3 INSTALLATION……………………………………………………………3 SECTION 4 KEY DESCRIPTIONS……………………………………………………4 SECTION 5 DISPLAYS…………………………………………………………………5 SECTION 6 OPERATION…………………….……………………………………….…6 6.1 Zeroing the display………………………………………………………………….6 6.2 Taring……………………………………………………………………………..……6 6.3 Weighing a sample…….………………………………………………….………….6 6.4 Parts counting…………………………………………………………………………6 6.5 Check-weighing…………………………………………………………………….7 6.6 Accumulated total……………………………………………………………………8 6.7 Net/gross change …………………………………………………………………….8 SECTION 7 PARAMETERS…………………………………………………………9 SECTION 8 BATTERY OPERATION………………………………………………..…11 SECTION 9 RS-232 OUTPUT………………………………………………………….12 SECTION 10 CALIBRATION……………………………………………………..…….13 SECTION 11 TECHNICAL PARAMETES…………………………………………….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 II CTB serial bench scale service manual 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 III 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. 1 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 voltage Max 5V/150mA Load cells drive Up to four 350 ohms cells 2 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. 3 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. 4 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 Low Battery Symbol Stability Symbol Parts Counting Units /pcs HI GROSS OK TARE lb LO ZERO Checkweighing Symbols Weighing Units Center of Zero Indication 5 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. 6 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. 7 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. 8 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 begin. H-L” press the ZERO/ENTER key to 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. 9 CTB serial bench scale service manual FUNCTION MENU SETTINGS FUNCTION SUB-FUNCTION DESCRIPTION F0 H-L Set a value for the Low limit. Set a value for the High Limit. Clears the accumulation memory without printing the results. Prints the Accumulation memory total and then clears the memory. Prints the Accumulation Total, does not clear the memory. Set the backlight to be on, automatic or off, EL on EL Au EL off Set the beep mode.(check weighing mode 2, check weighing mode3, no beep) Set the time of automatic sleep: 1,5,10,30 or OFF Enter the programming and calibration menus by entering the correct password. See the section 11. F1 toL SEt Lo SEt HI to CLr to P-C to Prt F2 off bL beep sleep Prog Pin DEFAULT VALUE 000.000 000.000 EL Au 10 10 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. 11 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 GS 12.340kg No.. 1 stored in memory Total 12.340kg <lf> <lf> GS for Gross weight, NT for net weight and a unit of weight This number increments every time a new value is The total value stored in memory Includes 2 line feeds When parts counting the weight, unit weight and count will be printed. GS U.W. PCS <lf> <lf> 12.340kg GS for Gross weight, NT for net weight and a unit of weight 123.4g/pcs The average piece weight computed by the scale 100pcs The number of parts counted Includes 2 line feeds When recalling the Total weight stored in the accumulation memory the output format is: *************** <lf> TOTAL No. 5 Wgt 21.455kg *************** A line of stars is shown Includes 1 line feed . 12 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 13 CTB serial bench scale service manual P1 REF AZN 0 0-AUTO 0- RANGE P 2 CAL This option is used to select the auto zero tracking. Options : 0.25d, 0.5d, This option is used to select the Initial zero setting range (mechanism) when turn the indicator. Options : 0%, 2%, 5%, 10%, 20% 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. Calibrate, see detail in section 10. This display will show xxxxxx for indicating the internal counts. Automatic print setting, when the weight is stable, the data will be printed automatic Manual print setting, when the weight is stable, press the PRINT key, the data will be printed. Connect PC, the data will be send to PC CAL CNT P3 P RT P-AUTO P-PRT P cont 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 Display is blank, No turn on test Possible cause Mains power is turned off Power supply not plugged in Power supply faulty Internal battery not charged Display turned off Common solutions 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. 14 CTB serial bench scale service manual Display blank after turn on test, Error message Display is locked OL or FULL appears on display UL or NULL displayed Display is unstable Pan not installed Unstable weight Load cell damaged Mechanics damaged Maximum capacity exceeded Load Cell or mechanics damaged Power supply faulty Weight on scale below permissible limit Pan has been removed Pan support not seated properly Power supply faulty Load Cell or mechanics damaged Drafts or air currents Obstruction under pan Sample is moving (animal weighing) Vibrations through table Temperature changed dramatically Power supply faulty Check the pans are installed correctly. Try turning the scale on again. Check the pans are installed correctly. Try turning the scale on again. Check the pans are installed correctly. Try pressing Zero key. Try turning the scale on again. 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 Off Center Overload stops hitting too soon Load cell or mechanics damaged A/D damaged Adjust mechanics Overload Stops not correct 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. Look for obstruction under pan, shipping screws, and verify pan 15 CTB serial bench scale service manual Loading error Battery will not charge Overload Stops not correct Load Cell damaged Mains voltage not present or too low Charging circuit failure Battery Failure shipping screws, and verify pan installation. Verify the batteries are rechargeable types. Check power supply voltage is correct. SECTIOIN 13 TROUBLESHOOTING START CHK power switch and connector Replace power switch or Battery voltage>5.5V T10 pin 3 output5V Charging the battery immediately or replace the battery CHK T10 and around circuit CHK U1 pin9 High level when power on And return to low level CHK U1 and around circuit CHK ST (11.0592MHz) 13 CHK ST and around circuit 2 no display CHK U1 START and around circuit CHK LCD break? 16 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 transformer bad) Cut the circuit, then CHK transformer output >10V Replace transformer Open U5 pin11/12, CHK BR1 output >12V Restore the circuit, CHK U5 pin2 output>7V Y CHK BR and around circuit N CHK M/B U5 and around circuit CHK M/B D1, R7 and around circuit 17 CTB serial bench scale service manual 13 4 Can’t weigh START CHK whether can show internal counts N N CHK M/B AU1 pin15=5V Y Y Add load on pan, CHK counts raise N Y Do calibrate CHK power circuit CHK load cell input circuit Add load on pan, CHK output between AU1 pin1 and pin2 signal change Y Check load cell N CHK AU1 and around circuit 18 CTB serial bench scale service manual 13 5 unstable START OK after warn N Load cell and bracket touch something Y Dispel humidity Y Solve touch problem N CHK M/B AU1 and around circuit 13 6 Can’t use keyboard 19 CTB serial bench scale service manual START Find the line for useless key, short and open it, CHK the scale accept this Y Replace keyboard N CHK U1 and around circuit 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, out main board carefully. Then then you can bring install the new main board, plug all connector at last ATTENTION CH3.96 4P connector (for 20 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. 21 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. 22 CTB serial bench scale service manual SECTION15 APPENDIX 15.1 SCHEMATIC (main) VAC BR1 2 VAC 3 C5 3K R6 3.9K 25V/470UF VB 10 3 LOADCELL VCH S+ 10K R5 13 C10 201 S- 10K LM723CN AR8 AC11 0.022UF 10K AR5 10K AR1 18 17 10K AR6 10K R4 4 E+ AR7 AC10 0.022UF AC12 0.022UF 10K AC13 0.022UF 3 4 1 2 20 19 7 8 1 VIN VOUT 3 AC12 100UF/25V 2K R20 5.1K 1 470UF/25V104 VIN R18 1.5K VOUT CS A1N1+ A1N1A1N2+ A1N2A0 A1 SDI SDO SCLK 20K CS 13 12 SDI SDO 11 SCLK CS5532 3 10K R11 T3 9014 AVCC AC4 AC6 VAC R10 AC8 T5 9015 100K T4 9015 R14 100K R9 10K R13 1K R12 470UF/25V 6.8UF/25V100UF/25V LED 1K VGND R17 4.9152 14 VCH 6.8UF/25V G R19 3.9K 15 OSC2 OSC1 C1 C2 AC14 D2 IN4736 2 T6 9014 C17 T8 LM2931 GND R21 5.1K R16 RST AST2 9 10 DVCC C18 2 KEY GND T7 8550 VREF+ VREF- 6 T10 LM2931 VB AU1 VD+ D1 R8 2 AR2 10K R 4 V+ VOUT VC VREF CL N.I. NC CS NC NC INI VZ VCOMP AC9 104 DGND R7 10 VCC 16 VB U5 SS+ GND EE+ VA+ VAC 12 11 6 5 14 8 1 9 7 1 2 3 4 5 VA- 100K 1 1 2 3 4 T2 TIP31C 5 E+ R3 POWER CHECK R22 3K VCC T8 C14 6.8uf/16v R23 100 C13 0.047uf 3 4 2 1 OUT EL2 TR1 GND EL1 T9 9014 R23 2K BL 23 CTB serial bench scale service manual 15.2 SCHEMATIC (display) KEY 1 2 3 4 5 6 7 8 VCC 1 KEY1 KEY2 KEY3 KEY4 KEY5 VB KON 2 R2 T1 9014 BUZZ 2K RP3 VCC VCC U1 1 2 3 4 5 6 7 8 9 KEEP1 2 3 4 5 6 7 8 103G 5532.CS 5532.SDI 13 12 15 14 R1 VCC C2 20P C1 20P C19 10K ST1 11.0592 R15 VCC 10UF/10V P10/T P11/T P12 P13 P14 P15 P16 P17 P00 P01 P02 P03 P04 P05 P06 P07 INT1 INT0 P20 P21 P22 P23 P24 P25 P26 P27 T1 T0 31 EA/VP 19 18 39 38 37 36 35 34 33 32 BL 21 22 23 24 25 26 27 28 5532.SCLK 5532.SDO SDA SCL WP PCH1 PCH2 CS RD WR DATA RP2 9 8 7 6 5 4 3 2 1 X1 X2 RESET 9 10 RXD 11 TXD 30 29 RXD TXD ALE/P PSEN RD WR 10K 103G LCD U4 SEG27 13 SEG26 14 SEG25 15 SEG24 16 SEG23 17 SEG22 18 19 20 COM3 21 COM2 22 COM1 23 COM0 24 12 11 10 9 8 7 6 5 4 3 2 1 12 11 10 9 8 7 6 5 4 SEG28 3 SEG29 2 SEG30 1 SEG31 R30 VCC VCC 1K 103G RESET 17 16 RP1 1 2 3 4 5 6 7 8 9 U2 5 8032 6 7 VCC VCC SDA VSS A2 A1 WP A0 SCL 8 4 3 2 1 SEG7 1 SEG6 2 SEG5 3 SEG4 4 SEG3 5 SEG2 6 SEG1 7 SEG0 8 1621.CS 9 RD 10 WR 11 DATA 12 13 14 15 16 17 18 19 20 COM0 21 COM1 22 COM2 23 COM3 24 HT24LC02 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 CS RD WR DATA VSS OSC0 OSC1 VLCD VDD IRQ BZ BZ COM0 COM1 COM2 COM3 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 1621B 330K R26 VB C6 R27 240K VCC VAC R29 20K R28 20K R24 300K R25 220K U3 LM358 1 PCH1 3 U3 LM358 6 7 5 U8 VCC 2 PCH2 1 2 3 4 T 25V/10UF C7 25V/10UF C8 25V/10UF R SERIAL C9 2 1 3 4 5 7 8 6 V+ VCC C1+ T1OUT C1R1IN C2+ R1OUT C2T1IN T2OUT T2IN R2IN R2OUT VGND 25V/10UF MAX232 16 14 13 12 11 10 9 15 VCC TXD RXD 23 CTB serial bench scale service manual 15. 3 PARTS DRAWING 2 5 CTB serial bench scale service manual 15. 4 PARTS LIST Parts No. Parts name QTY Material 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 7 Battery holder 1 SUS#304 8 Battery 1 Lead acid 9 Bottom cover 1 ABS 10 washer 6 EPDM 11 screw 6 S18C 12 Neck parts 1 1 ABS 13 Neck parts 2 1 ABS 14 Neck parts 3 1 ABS 15 1 S18C 1 Al 17 nut Load cell upper supporter Load cell 1 Al 18 Pole 1 SST 19 Bottom bracket 1 Al 20 Overload stop screw 4 S18C 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 29 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 16 Spec M4 x 8 6V/4Ah M4 x 20 M6 x 3.5 M8 x 7 2 5 CTB serial bench scale service manual 15. 5 ERROR CODES ERROR DESCRIPTION CODES - - - - Over range Err 1 Date Setting Error Err 2 Time Setting Error Err 4 Zero Setting Error Err 6 A/D out of range Err 9 Unstable, can’t return to zero RESOLUTION Remove weight from the scale. If the problem persist contact your dealer for assistance. Enter date using correct format and reasonable values. Format: yy:mm:dd Enter time using correct format and reasonable values. Format: hh:mm:ss 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. 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. 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 I 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J A B C D E F G H I J K L M N O P Q R S T K L M N O P Q R S T U V W X Y Z U V W X Y Z !