WQS5002-e Quality Scale Tolerance Scale. Sartorius Quality Scale Sartorius Tolerance Scale Service Manual TS VQ1

Transcription

1 WQS5002-e93051 Quality Tolerance Sartorius Quality Sartorius Tolerance Service Manual TS VQ1 QS 4000 QS 8000A QS 16000B

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3 Contents... Page Exploded-View Diagram QS-Mini... 4 Exploded-View Diagram TS VQ Service Tools and Equipment... 8 General Information... 9 Differences between QS-Mini and TS VQ1 s... 9 Key Functions... 9 Startup Routine and Error Codes for MP 10.3 s Table of Adjustment Data Operating Program How to Access the Menu of the Operating Program and Change Menu Code Settings Overview of the MP 10.3 Menu Description of the Functions Operating Principle Block Diagram Adjusting the Adjustment Sequence How to Open the Display Head How to Access the Gross Value Mode Adjusting the Overload Stop Adjusting the Overload Stops on the QS-Mini Adjusting the Overload Stops on the TS12-000VQ How to Adjust the Zero Point Offset Value Checking the Off-Center Load Adjusting the Linearity Calibrating the Calibrating the in the Weighing Mode Calibrating the in the Gross Value Mode Repairing the Exchange the Main PCB Exchanging the Weighing System Table of Test Points Test Point location Data Interface YDO 01 TS How to Install the Data Interface General Specifications Data Output Format Data Output Parameters Data Output und Pin Assignment Circuit Diagrams for QS 8000 A s... Appendix

4 Exploded-View Diagram QS-Mini 4 Quality / Tolerance Status 01 / 93

5 Index Designation 101 Front plate 102 Main PCB 103 Cable clamp 104 Rear panel of the display head 105 Caps 106 Power receptacle 107 Retainer 108 Display holder 109 Data interface 110 Load receptor 111 Leveling foot 112 Cable clamp 113 Stop screw 114 Foot cap 115 Stop screw 116 Weighing system 117 Spring 118 Pan support 119 Stop screw 120 Weighing platform Status 01 / 93 Quality / Tolerance 5

6 Exploded-View Diagram TS VQ1 6 Quality / Tolerance Status 01 / 93

7 Index Designation 201 Main PCB 202 Cable clamp 203 Rear panel of the display head 204 Caps 205 Power receptacle 206 Retainer 207 Display holder 208 Front plate 209 Spacer disk 210 Cable clamp 211 Weighing system 212 Cable clamp 213 Leveling foot 214 Stop screw 215 Weighing system cover 216 Platform support 217 Load recepter base 218 Housing cover 219 Load recepter disk 220 Weighing platform Status 01 / 93 Quality / Tolerance 7

8 Service Tools and Equipment In addition to the appropriate tools, it is necessary to set up your scale in a stable, clean work area that is free of vibrations and drafts. In addition to your regular tools, you need the following special tools for the SARTORIUS QS-Mini s and the TS VQ1: Qty./Set Description Order number 1 Torque wrench 4-18 NM Open jaw wrench SW 10 mm Digital voltmeter 4 ½ digit (e.g. Beckmann) Channel oscilloscope 20 MHz 1 Refferance power supply (e.g. Analogic AN 3100) Necessary weights: 1 Calibration weight 5 kg YCW Calibration weight 10 kg YCW Set of Service weights YSS Important Note In order to work on the SARTORIUS QS-Mini s and TS12-000VQ1, much experience, completion of a service course in Goettingen, Germany and all special tools are required. Repair attempts by nonauthorized persons should be avoided. Repair of the scales by anyone other than an authorized SARTORIUS service technician results in the loss of all warranty coverage. 8 Quality / Tolerance Status 01 / 93

9 General Information Differences between QS-Mini and TS VQ1 s This manual is compiled on the basis of the model series QS All text and figures are transferable to the entire model series QS-Mini and to the TS VQ1. The QS-Mini and TS VQ1 s are from their appearance rather different but as far as servicing them, they are practically identical. The differences of the TS VQ1 s along with relevant information are listed in the following under the appropriate section headings.»key Functions«- page 9 The TS VQ1 is not equipped with the complete MP 10.3 keypad. The following keys are not present:,, and.» Operating Program«- page 11 When using a TS VQ1 you can view the code settings in the scale operating program, but you cannot change or store code settings.»adjusting the Overload Stop«- page 17 Because the adjustment of the scales differs, there are two separate sections under this heading.»adjusting the Overload Stops on the QS-Mini«- page 17»Adjusting the Overload Stops on the TS VQ1«- page 21»Replacing the Weighing System«- page 30 For the replacement of the weighing System on the TS VQ1 s please refer to the Service Manual»SARTORIUS Tolerance - for TS-s Featuring Strain Gauge System«(section»Exchanging the Weighing System«- page 24). Key Functions Important Note In addition, please read the section entitled»differences between QS-Mini and TS VQ1 s«, on page 9. ON / OFF key Tare key - zeroes the display Print key - initiates data output (not available for TS VQ1) Press this key to clear or interrupt programs in process and to confirm the storage of changed menu code settings (not available for TS VQ1) Function key to access the F1 application (on TS VQ1 s only calibration function) Function key to access the F2 application (not available for TS VQ1) Toggle key for weighing range (not available for TS VQ1) Status 01 / 93 Quality / Tolerance 9

10 Startup Routine and Error Codes for MP 10.3 s Startup Routine After you turn on the scale with the key, the scale processor checks some of the weighing functions. The following appear one after the other in the display: - Display segments light up. - Display segments are blanked out. - The scale is ready to operate once the readout 0.0g/0g is displayed. Other display symbols will appear, depending on the menu codes, which are set in the scale operating program. Error Codes The scale is underloaded, e.g. the weighing platform is not in place or is improperly positioned, offset value adjustment or calibration was performed incorrectly, or the weighing system or the A/D converter are defective. The maximum capacity of the scale has been exceeded, e.g., the weight on the platform is too heavy, the scale has been improperly calibrated, or the weighing system is defective. Operating error, e.g., the reference weight is too small. Zero point error at the beginning of the calibration procedure, e.g., the scale has not been tared or has not been unloaded prior to the calibration procedure, the zero point is outside the tolerance limit (<=20% from the maximum load). The battery voltage is too low in the battery operation mode, recharge the battery. If the key symbol remains in the display, the processor is still busy processing a function and will not accept any command to perform other functions. Turn off the scale using the key and then on again. 10 Quality / Tolerance Status 01 / 93

11 Table of Adjustment Data Model QS 4000 QS 8000 A QS B TS VQ1 Capacity / range 4,000 g 8,000 g 16,000 g 12,100 g Readability 0.1 g 0.2 g 0.5 g 1 g Reproducibility <=± 0.1 g <=± 0.2 g <=± 0.5 g <=± 1 g Linearity <=± 0.1 g <=± 0.2 g <=± 0.5 g <=± 1 g Calibration weight 2,000 g / F2 5,000 g / F2 2 * 5,000 g / F2 2 * 5,000 g / F1 Off-center test weight Off-center test area Off-center tolerance Zero point offset test weight Zero point offset target value Zero point offset tolerance range 4,000 g / ø = 60 mm 5,000 g / ø = 80 mm 10,000 g / ø = 100 mm 10,000 g / ø = 100 mm at the brim of the pan at the brim of the pan at the brim of the pan at the brim of the pan <=± 0.4 g <=± 0.4 g <=± 1 g <=± 2 g Unloaded scale Unloaded scale Unloaded scale Unloaded scale 8,455 8,455 8,455 8,455 6,200-10,700 6,200-10,700 6,200-10,700 6,200-10,700 Operating Program Important Note In addition, please read the section entitled»differences between QS-Mini and TS VQ1 s«, on page 9. In the menu of the scale operating program, you can change individual settings regarding the weight unit, scale response, display reponse, data output parameters and application parameters. For the factory-set menu codes, please refer to»overview of the MP 10.3 Menu«(see page 13). Use the»codes«to select functions in the menu of the scale operating program. Each code consists of a number which is on the left hand side for the first level (Block) and a number which is on the right hand side for the second level (Function). Important Note When using the TS VQ1 you cannot change the code settings in the menu of the scale operating program. Status 01 / 93 Quality / Tolerance 11

12 How to Access the Menu of the Operating Program and Change Menu Code Settings Proceed as follows to access the menu of the scale operating program: - Turn the scale off by pressing the key. - Turn the scale on by pressing the while holding the key and keeping it pressed. Do not release the key until the readout shown on the left appears in the display. - Then the first level (Block) of the operating menu will appear. If you would like to check or change a menu code, proceed as follows: - Press the key to select the next higher Block. - Press the key to select the next lower Block. - Press the key to access the second level (Function) of the operating menu. - The set function, identified by»o«, will now be displayed. - Press the key to select the next higher function. - Press the key to select the next lower function. - To return to the first level (Block) without making any changes, you must press the key for a function which has already been set (identified by»o«in the display). - To set a new function, you must press the key for the desired function. - Afterwards, the program automatically returns to the first level (Block). - Now you can select the next Block and change the function settings. - To exit the menu of the scale operating program and store the settings, return to the first level and press the key. - If you turn the scale off by pressing the key while the scale operating program is accessed, the changes will not be stored. 12 Quality / Tolerance Status 01 / 93

13 Overview of the MP 10.3 Menu 1 Weight Unit W1 (Initial unit) 1-1 Grams g 1-2 Kilograms kg 1-3 Carat ct 1-4 Pounds lb 1-5 Ounces oz 1-6 Troy Ounces ozt 1-7 Hong Kong taels tl 1-8 Singapore taels tl 1-9 Taiwanese taels tl 1-10 Grains gr 1-11 Pennyweights dwt 1-12 Parts / pound o 2 Weight Unit W2 (Conversion Unit) 2-1 Grams g 2-2 Kilograms kg 2-3 Carat ct 2-4 Pounds lb 2-5 Ounces oz 2-6 Troy Ounces ozt 2-7 Hong Kong taels tl 2-8 Singapore taels tl 2-9 Taiwanese taels tl 2-10 Grains gr 2-11 Pennyweights dwt 2-12 Parts / pound o Weighing-in-% Mode (activate using»f2«) 2-13 Weighing-in-% with one decimal place (100.0 %) % 2-14 Weighing-in-% with two decimal places ( %) % Parts Counting Mode (activate using»f2«) 2-15 Ref. determination according to internal resolution, ref. sample quantity 10, 20, 50 and 100 pcs 2-16 Ref. determination according to display resolution, ref. sample quantity 10, 20, 50 and 100 pcs 3»F1«- Application 3-1 no application assigned 3-2 Net total / 2nd tare memory 3-3 Over/under checkweighing with absolut readout (tolerance ± 2.5 %) 3-4 Over/under checkweighing with readout of weight difference (tolerance ± 2.5 %) 3-5 Over/under checkweighing with absolut readout (tolerance ± 5 %) 3-6 Over/under checkweighing with readout of weight difference (tolerance ± 5 %) Status 01 / 93 Quality / Tolerance 13

14 4 Ambient Conditions 4-1 very stable 4-2 stable 4-3 unstable 5 Stability Range 5-1 ¼ digit 5-2 ½ digit digit digits digits digits digits digits 6 Tare Parameter 6-1 without stability 6-2 at stability 7 Auto Zero 7-1 OFF 7-2 ON 8 Data Output Parameters 8-1 Single print regardless of stability 8-2 Single print at stability 8-3 Auto print regardless of stability 8-4 Auto print at stability 9 Automatische Abschaltung und Anzeigehinterleuchtung 9-1 Automatic shutoff ON - Backlighting OFF 9-2 Automatic shutoff OFF - Backlighting OFF 9-3 Automatic shutoff ON - Backlighting ON 9-4 Automatic shutoff OFF - Backlighting ON 10 Linear Range Display / Checkweighing Display 10-1 ON 10-2 OFF 14 Quality / Tolerance Status 01 / 93

15 Description of the Functions Operating Principle s of the model series QS-Mini and the TS VQ1 feature a weighing system which consists of a spring body with four strain gauges which are glued to the body. These strain gauges constitute a Wheatstone brigde which is supplied with a reference voltage of +11V. When a load is placed on the scale, the spring body is bent slightly. In the process, two of the four strain gauges are compressed and the other two are streched. This results in a change in resistance and, consequently, a change in voltage which is proportional to the load which was applied on the weighing platform. This voltage is transmitted to the summing point of the A/D converter via amplifier IC111, low-pass filter IC113 and resistor R167. In the A/D converter consisting of: SBS-2 IC108, integrator IC110, reference buffer IC112, resistor R167 (measuring voltage at the summing point), resistor R168 (reference voltage at the summing point), and capacitor C165 (integration capacitor) a digital measuring result is generated by the stabilized voltage from low-pass filter IC113. This result is transmitted to the scale processor IC104, which directly controls the display, depending on the weight unit wich was selected. The specific scale data and the calibration weight value are stored in the parameter EEPROM IC107. Via a built-in data interface (optional) it is possible to send data to peripherals. Block Diagram Status 01 / 93 Quality / Tolerance 15

16 Adjusting the Before you begin to adjust the scale, allow it to warm up for at least 30 minutes und run a function test. Important Note The numbers next to the components (e.g. main PCB (102/201)) refer to the exploded-view diagrams on pages 4 and 6. Adjustment Sequence Adjust the overload stops Adjust the zero point offset value Check the off-center load Adjust the linearity Calibrate the scale How to Open the Display Head You only need to open the display head if you wish to adjust the zero point or the linearity. All tests and calibration can be performed without opening the scale. - Disconnect the scale from line power. - Remove the 4 caps (105/204) from the rear panel of the display head (104/203). - Remove the 4 exposed screws (104A) from the rear panel of the display head (104/203). - Pull the front plate (101/208) with the main PCB (102/201) slightly out of the rear panel of the display head (104/203) and tilt it forward. - Now all components necessary for adjusting the zero point offset value and linearity are exposed. - To close the display head, proceed in the reverse order indicated above. 16 Quality / Tolerance Status 01 / 93

17 How to Access the Gross Value Mode To perform some adjustments, it is necessary to access the gross value mode. In the process, the uncalculated A/D converter value (gross value) appears in the weight display. - Switch the scale to the STANDBY mode by pressing the key. - Unload the scale (clear the weighing platform). - Hold down the key and the key and press the key. Release the key and key only after the readout shown on the left is displayed. - A positive value without a weight unit symbol is displayed. - To exit the gross value mode, press the key twice. Adjusting the Overload Stop Important Note In addition, please read the section entitled»differences between QS-Mini and TS VQ1 s«, on page 9. Adjusting the Overload Stops on the QS-Mini s Checking the Overload Stops Lower Center Stop Important Note The lower center stop is not visible during the checking and adjusting processes. Therefore, you must locate it by ear. - Center the maximum load (QS 4000 = 4 kg / QS 8000A = 8 kg / QS 16000B = 16 kg) on the weighing platform (120). - Press down on the loaded weight several times, and listen to make sure that the stop is free. Status 01 / 93 Quality / Tolerance 17

18 - Afterwards, increase the load in increments of 200 g until it equals the maximum load plus 1 kg. - After each load increase of 200g, check the lower center stop by pressing down on the weights several times. - When the maximum load plus 1 kg is reached, no sound from the stop may be heard. - If the stop sound cannot be heard before the maximum load plus 1 kg is reached or if the stop can still be heard when the maximum load plus 1 kg is reached, you must adjust the lower center stop. Upper Center Stop - Remove the weighing platform (120). - While the scale is unloaded, check the setting of the upper center stop (119) using a feeler gauge. There must be a space of 0.6 mm between the pan support (118) und the stop (119) (tolerance: +0.1 mm). - If the space is incorrect you must readjust the upper center stop. Corner Stops - Remove the weighing platform (120) and replace it upside down on the scale. - Place the maximum load (QS 4000 = 4 kg / QS 8000A = 8 kg / QS 18 Quality / Tolerance Status 01 / 93

19 16000B = 16 kg) on position 1 of the weighing platform (120). - Check the setting of the corresponding corner stop (115) using a feeler gauge. There must be a space of 0.25 mm between the pan support (118) and the stop (115). - If the space is incorrect you must readjust the corresponding corner stop. - Proceed as indicated above with positions 2 through 4. - When all of the overload stops are correctly positioned, you can continue with additional adjustments. Adjusting the Overload Stops Lower Center Stop Important Note The lower center stop is not visible during the checking and adjusting processes. Therefore, you must locate it by ear. - Place the scale on a stable raised base in such a way that you can adjust both of stop screws (113) from below. - Center the maximum load plus 1 kg (QS 4000 = 4 kg / QS 8000A = 8 kg / QS 16000B = 16 kg) on the weighing pan (120). - Loosen slowly both screws (113) until the stop is audible. - Turn one of the two screws (113) toward the stop. While doing so, check the space between the srew and the stop by pressing down repeatedly on the weight loaded. - In this way you will find the point where the screw (113) and the stop barely touch (no stop sound). Important Note In order to adjust the second stop screw (113), you have to temporarily turn the screw (113) that you before adjusted back ¼ of a turn. - Adjust the second screw (113) in the same way as the first. - When the second stop screw (113) is correctly adjusted, you can tighten the first stop screw ¼ of a turn. - When both stop screws (113) correctly adjusted, remove the scale from the raised base. Status 01 / 93 Quality / Tolerance 19

20 Upper Center Stop - Remove the weighing platform (120). - Adjust the upper center stop (119) while the scale is unloaded. - Adjust the upper center stop (119) so that there is a space of 0.6 mm (tolerance: mm) between the pan support (118) and the stop (119). Check the space using a feeler gauge. - When the space is of the correct size, replace the weighing platform (120). Corner Stops - Remove the weighing platform (120) and replace it upside down on the scale. - Place the maximum load (QS 4000 = 4 kg / QS 8000A = 8 kg / QS 16000B = 16 kg) on position 1 of the weighing platform (120). - Use a feeler gauge to determine the space between the corresponding corner stop (115) and the pan support (118). - To adjust the corner stops proceed according to the following example: - The actual value (space determined using a feeler gauge) is e.g. 1 mm. - The target value is 0.25 mm. - The difference (actual value minus target value) is 0.75 mm in our example. - The grade of the stop screw is 1 mm, i.e.: 1 turn clockwise increases the space by 1 mm 1 turn counter clockwise decreases the space by 1 mm - The setting adjustment results from the following: 1 turn of the stop screw changes the space by 1 mm. That means, in the example, that the stop screw must be adjusted ¾ of a turn counterclockwise (difference 0.75 mm). - To adjust the stop screw, remove the weights and the weighing platform (120). - Adjust the positions 2-4 corner stops in the same way. - After adjusting the stops, replace the weighing platform (120) on the scale. - When all of the overload stops correctly adjustet, you can continue with additional adjustments. 20 Quality / Tolerance Status 01 / 93

21 Adjusting Overload Stops on TS VQ1 Test Setup: - Remove the weighing platform (220). - Unscrew the four load receptor disks (219). - Gently pull the right and left hand sides of the upper part of housing (218) apart and lift off the housing cover. - Screw the four load receptor disks (219) onto the load receptor bases (217). - Replace the weighing platform (220). - After you have checked and, if necessary, adjusted the overload stops, reconstruct the TS VQ1 in reverse order. Checking the Overload Stops - Perform the test setup procedures. - Place the maximum load (TS VQ1 = 12 kg) on position 1 of the weighing platform (220). - The load receptor bases (217) of the loaded corner may not come into contact with the stop screw (213.A). - Increase the weight loaded 1 kg (TS VQ1 = 13 kg). - Now the load receptor bases (217) of the loaded corner must come into contact with the stop screw (213.A). - Check positions 2 through 4 in the same manner. - If the load receptor base (217) already touches the stop screw (213.A) when the maximum load is placed or if it does not touch the stop screw when the maximum load plus 1 kg is loaded, the stop screw (213.A) must be adjusted. - When all of the stop screws (213.A) are correctly adjusted, you can close the scale in reverse order and continue with additional adjustments. Status 01 / 93 Quality / Tolerance 21

22 Adjusting the Overload Stops - Perform the test setup procedures. - Access the gross value mode (see page 17). - Place the maximum load plus 1 kg (TS VQ1 = 13 kg) on the corner of the weighing platform (220) which is to be adjusted. - Loosen the lock nut (213.B) of the corresponding stop screw (213.A) and turn the stop screw (213.A) until the load receptor bases (217) is clear. - Slightly tighten the stop screw (213.A) until the stop screw and the load receptor bases (217) is established. - While doing this, please observe the gross value mode display. The readout will change as soon as the stop screw (213.A) contacts the load receptor bases (217). - In this way, locate the point where the stop screw (213.A) and the load receptor bases (217) come slightly into contact. - Secure the stop screw in this position using the lock nut (213.B). - Proceed in the same manner to adjust the other stops. - After adjusting all of the stops, recheck them. - Afterwards, close the scale in reverse order and continue with additional adjustments. How to Adjust the Zero Point Offset Value It is necessary to adjust the zero point offset value to adapt the bridge voltage of the strain gauge system to the operating range of the electronic components in the scale. This may be necessary if: -»L«or»H«is constantly displayed, -»L«remains in the display even after small weights have been placed on the weighing platform, -»H«is displayed before the maximum load is reached or - the error code»e«is displayed during calibration. How to Check the Zero Point Offset Value - Access the gross value mode (see page 17). - The gross value displayed with the scale unloaded should be approx. + 8,455 (allowable tolerance range: + 6, ,700). - If the displayed gross value is outside this tolerance range, the zero point must be readjusted. 22 Quality / Tolerance Status 01 / 93

23 Zero Point Offset Value Data Zero Point Offset Model Test Weight Target Value Tolerance Range QS 4000 Unloaded scale + 8, , ,700 QS 8000 A Unloaded scale + 8, , ,700 QS B Unloaded scale + 8, , ,700 TS VQ1 Unloaded scale + 8, , ,700 How to Adjust the Zero Point Offset Value - Open the display head (see page 16). - Locate the position of balancing resistors R190 and R192 on the main PCB (102/201) (see»overview of the Test Points«page 34). - Desolder balancing resistors R190 and R Connect a resistor decade box to the main PCB (102/201) in place of resistor R Adjust the largest resistance possible on the decade box. - Reconnect the scale to line power. - Access the gross value mode (see page 17). - Change the setting on the resistor decade box until the gross value displayed is approx. + 8, Read off the resistance indicated on the decade box and locate the next higher resistor of the E12 standard. Example: kohm (decade box) yields 4.7 kohm (resistor) - Unplug the scale from line power and disconnect the resistor decade box. - Solder the determined resistor on position R190 of the main PCB (102/201). - Aferwards, recheck the zero point offset value (see page 22). - Now you can make additional fine adjustments of the zero point offset value using parallel resistor R Proceeding as indicated above, connect the resistor decade box parallel to resistor R190, which has already been soldered onto the main PCB (102/201). Now solder the determined resistor to position R192 on the main PCB (102/201). - After you have adjusted the zero point offset value, close the display head. Status 01 / 93 Quality / Tolerance 23

24 Checking the Off-Center Load How to Check the Off-Center Load - Compare the values displayed with the tolerances indicated below. Off-Center Load Data - Turn on the scale by pressing the key. - Place the off-center load test weight on position 1 on the weighing platform (120/220). - Tare the scale by pressing the key. - Place the test weight on each of the positions 2 through 5 (in sequence) and write down the values displayed: Example (QS 4000): Pos g Pos g Pos g Pos g Pos g Model Off-Center Load Test Weight Off-Center Load Testing Surface Off-Center Load Tolerance QS ,000 g / ø = 60 mm at the brim of the pan <=± 0.4 g QS 8000 A 5,000 g / ø = 80 mm at the brim of the pan <=± 0.4 g QS B 10,000 g / ø = 100 mm at the brim of the pan <=± 1 g TS VQ1 10,000 g / ø = 100 mm at the brim of the pan <=± 2 g Adjusting the Off-Center Load To adjust the off-center load, you must have special knowledge about the strain gauge system which cannot be explained in detail in this service manual. However, adjustment of the off-center load is covered in the corresponding service training course. For more information, please contact Sartorius AG in Goettingen, Germany, or the Sartorius Training Center. Adjusting the Linearity How to Check the Linearity - Check the linearity for the entire weighing range (capacity) in increments of 500 g or 1,000 g. - Compare the values displayed with the tolerances indicated below. If the deviations are larger, the linearity must be adjusted. 24 Quality / Tolerance Status 01 / 93

25 Linearity Data Model Capacity / Range Linearity QS ,000 g <=± 0.1 g QS 8000 A 8,000 g <=± 0.2 g QS B 16,000 g <=± 0.5 g TS VQ1 12,100 g <=± 1 g How to Adjust the Linearity - Open the display head (see page 16). - Locate the position of balancing resistor R186 on the main PCB (102/201) (see»overview of the Test Points«page 34). - Desolder resistor R Connect the scale to line power. - Calibrate the scale while in the gross value mode (see page 27). - Unload the scale and tare. - Place one half of the load (½ of the calibration weight) on the scale and tare. - Unload the scale and write down the readout. - Place the entire load (calibration weight) on the scale and write down the readout. - Compare the readouts and calculate the difference. Example (QS 4000): Half of the load g Entire load g Difference 0.5 g - Using this difference, you can now determine which balancing resistor from the table below should be used. - In this example (QS linearity 0.5 g) a 3.3 MOhm resistor should be used. Imporant Note Be aware that the resistors listed in this table are guidelines. Depending on the particular scale, it might be necessary to use the next higher or next lower resistor. - Disconnect the scale from line power. - Solder the determined resistor to position R186 on the main PCB (102/201). - Afterwards, recheck the linearity (see page 24). - After you have adjusted the linearity, close the display head. Status 01 / 93 Quality / Tolerance 25

26 Table of Balancing Resistors Linearity Error QS 4000 QS 8000 A QS B TS VQ1 Balancing Resistor Linearity Error Balancing Resistor Linearity Error Balancing Resistor Linearity Error Balancing Resistor 0.1 g 16 MOhm 0.2 g 16 MOhm 0.5 g 13 MOhm 1 g 2.4 MOhm 0.2 g 8.2 MOhm 0.4 g 8.2 MOhm 1.0 g 6.8 MOhm 2 g 1.2 MOhm 0.3 g 5.1 MOhm 0.6 g 5.6 MOhm 1.5 g 4.3 MOhm 3 g 820 kohm 0.4 g 3.9 MOhm 0.8 g 4.3 MOhm 2.0 g 3.3 MOhm 4 g 620 kohm 0.5 g 3.3 MOhm 1.0 g 3.3 MOhm 2.5 g 2.7 MOhm 5 g 510 kohm 0.6 g 2.7 MOhm 1.2 g 2.7 MOhm 3.0 g 2.2 MOhm 6 g 430 kohm 0.7 g 2.2 MOhm 1.4 g 2.4 MOhm 3.5 g 1.8 MOhm 7 g 360 kohm 0.8 g 2 MOhm 1.6 g 2 MOhm 4.0 g 1.6 MOhm 8 g 300 kohm 0.9 g 1.8 MOhm 1.8 g 1.8 MOhm 4.5 g 1.5 MOhm 9 g 270 kohm 1.0 g 1.6 MOhm 2.0 g 1.6 MOhm 5.0 g 1.3 MOhm 10 g 240 kohm Calibrating the QS-Mini scales and the TS VQ1 can be calibrated in two different ways. 1. Calibration in the Weighing Mode Here, calibration is performed in the same manner as for other SARTORIUS s and Balances. In the process, QS-Mini s and the TS VQ1 only accept calibration weights which are within a tolerance range of 2% of the calibration weight value. 2. Calibration in the Gross Value Mode Here, the tolerance limits are eliminated and QS-Mini s and the TS VQ1 accept only a calibration weight which is above the zero point threshold (20% of the maximum load). This is often required for servicing the scale, e.g., after adjusting the zero point offset value, after exchanging PCB s, after exchanging the strain gauge system or after exchanging the parameter EEPROM. Calibrating the in the Weighing Mode - Turn the scale off by pressing the key. - Unload the scale (clear the weighing platform (120/220)). - Hold down the key and press the key. Release the key only after the readout shown on the left is displayed. - Retare the scale using the key, then press the the key to start the calibration routine. - The calibration weight now appears in the display along with the»+«sign and without a weight value. 26 Quality / Tolerance Status 01 / 93

27 - Center the required weight on the weighing platform (120/220). - If this weight is correct, the»+«sign will go out in the display. Explanation of the plus and minus signs:»+«- the loaded calibration weight is too light»-«- the loaded calibration weight is too heavy or»+/-«goes out in the displ. - the loaded calibration weight is within the tolerance range and is accepted. - After a short time the processor IC104 will accept the calibration weight value, and the»+«sign, the weight unit»g«as well as the analog bar graph will appear in the display. - Unload the scale. Now the scale is ready to operate. Calibrating the in the Gross Value Mode - Turn the scale off by pressing the key. - Unload the scale (clear the weighing platform). - Hold down the key and the key and press the key. Release the key and the key only after the readout shown on the left is displayed. - A positive value without a weight unit symbol is now displayed. - To start the calibration routine, press the key. - The calibration weight is displayed without a plus or minus sign and without a weight unit symbol. - Center the required weight on the weighing platform (120/220). - After a short time the processor IC104 will accept the calibration weight value, and the»+«sign, the weight unit»g«as well as the analog bar graph will appear in the display. - Unload the scale. Now the scale is ready to operate. Status 01 / 93 Quality / Tolerance 27

28 Repairing the When repairing QS-Mini and the TS VQ1, we recommend that you exchange complete component groups if a defect is located because the strain gauge system (116/211) is a complete unit in itself and the main PCB (102/201) is equipped with SMD components (Surface Mounted Devices) technology. It is not possible to exchange the surface-mount components without using special tools. Therefore, SARTORIUS supports this type of service by exchanging defective PCB s at economical prices. The following component groups or individual parts may be exchanged using standard tools and equipment. In case of repair: strain gauge system (116/211) main PCB (102/201) parameter EEPROM IC107 LC display AZ101 data interface YDO 01 TS (optional) For adjustment purposes or to be transferred from the old main PCB (102/201) to the new PCB: resistors R190 and R192 for adjusting the zero point offset value resistors R151 - R154 and R156 - R159 for TC (temperature coefficient) compensation resistor R186 for adjusting the linearity If your workshop is equipped with the special tools for exchanging surface-mount components, you may repair PCB s at the component level. In this case the»table of Test Points«(see page 3) and the»overview of the Test Points«(see page 34) will help you to more quickly locate any defective components. After repairing the scale, check the scale functions over a long time period, if possible. Pay special attention to drift, the zero point offset value and calibration. Important Note The numbers next to the components (e.g. main PCB (102/201)) refer to the exploded-view diagrams on pages 4 and 6. How to Exchange the Main PCB - Open the display head (see page 16). - Unplug the weighing system interface cable from position St.3, the line voltage connection cable from position St.7 and if necessary the interface cable from position St.1 of the main PCB (102/201). 28 Quality / Tolerance Status 01 / 93

29 - Remove the front plate (101/208) along with the main PCB (102/ 201). - Unplug the foil covered keypad from position Bu.1 of the main PCB (102/201) and unscrew the grounding cable ( ). - Unscrew the four fastening screws (102.A) and remove the main PCB (102/201) from the front plate (101/208). - Transfer the following parts (if they are present) from the old main PCB to the new PCB (102/201): parameter EEPROM IC107, resistors R190 and R192 for adjusting the zero point offset value resistors R151 - R154 and R156 - R159 for TC compensation and resistor R186 for adjusting the linearity. - Place the new PCB (102/201) on the front plate (101/208). Make sure, that the interface cable of the foil covered keypad along with the grounding cable are inserted through the slots of the main PCB (102/201). - Refasten the main PCB (102/201) onto the front plate (101/208) using the 4 screws (102.A). - Plug the foil covered keypad back into position Bu.1 and reconnect the grounding cable ( ). - Hold the front plate (101/208) along with the main PCB (102/201) in front of the rear panel of the display head (104/203) and plug the weighing system interface cable back into position St.3 the line voltage connection cable back into position St.7 and if necessary, the interface cable back into position St.1 of the main PCB (102/ 201). - Now adjust the scale completely by: adjusting the zero point offset value checking the off-center load adjusting the linearity and calibrating the scale - Replace the front plate (101/208) along with the main PCB (102/ 201) in the rear panel of the display head (104/203) and fasten them from the back using the 4 screws (104.A). - Place the 4 caps (105/204) on the bore holes to cover the screws. - Now the scale is ready to operate. Status 01 / 93 Quality / Tolerance 29

30 Exchanging the Weighing System Important Note Please refer to the section entitled»differences between QS-Mini and TS VQ1 s«, page 9. - Open the display head (see page 16). - Unplug the weighing system interface cable from position St.3, the line voltage connection cable from position St.7 and, if necessary, interface cable from position St.1 of the main PCB (102). - Remove the front plate (101) along with the main PCB (102) and set them aside. - Unscrew both retainers 104.B from the rear panel of the display head (104). - Unscrew the cable clamp (103) and remove the weighing system interface cable along with the seal (104.C) from the rear panel of the display head (104). Set the rear panel aside. - Pull the weighing system interface cable down, out of the display holder (108). - Remove the weighing platform (120) and set the scale on its side. - Unscrew the cable clamp (112) and remove the weighing system interface cable from the guide on the underside of the base plate. - Replace the scale in an upright position. - Remove the stop screw (119) from the pan support (118). - Loosen both of the fastening screws (116.D) for the pan support (118) until you can remove the pan support (118) along with the ground spring (117) from the weighing system (116). 30 Quality / Tolerance Status 01 / 93

31 - Now loosen both of the system fastening screws (116.B) until you can remove the old weighing system (116) from the base plate. - Unscrew the two retainer plates from the old weighing system (116) and loosely fasten them to the new weighing system (116). Important Note At the factory, preadjustment of the zero point offset value of the new weighing system (116) was performed. The corresponding resistor has been installed in the weighing system (116). This resistor must be transferred to the main PCB (102). - Desolder the old resistor(s) R190 and R192 for zero point offset adjustment from the main PCB (102). - Solder the new resistor to position R190 on the main PCB (102). - Perform final adjustment of the zero point offset value after you have installed the new weighing system (116). - Insert the weighing system interface cable (116.A) down through the base plate (116.B). Position the new weighing system (116) and loosely fasten it. - Align the weighing system (116) and tighten the 2 screws (x) to 7.5 (+0.4) Nm. - Place the pan support (118) and ground spring (117) on the weighing system (116) and loosely screw them on. - Align the pan support (118) and ground spring (117) and tighten the 2 screws (116.D) to 7.5 (+0.4) Nm. - Tighten the stop screw (119) until there is a space of 0.6 mm between it and the pan support (118). Status 01 / 93 Quality / Tolerance 31

32 - Place the scale on its side. - Position the weighing system interface cable in the guide on the underside of the base plate and fasten it into place using the cable clamps (112). - Replace the scale in an upright position and position the weighing platform (120). - Now insert the weighing system interface cable in the display holder (108). - Place the weighing system interface cable through the opening in the rear panel of the display head (104) and tighten the seal (104.C). - Fasten the weighing system interface cable and, if necessary, the interface cable using the cable clamp (103). - Screw the rear panel of the display head (104) along with the 2 retainers (104.B) onto the display holder (108). - Hold the front plate (101/208) along with the main PCB (102/ 201) in front of the rear panel of the display head (104/203). - Plug the weighing system interface cable back into position St.3, the line voltage connection cable back to position St.7 and, if necessary. the interface cable back into position St.1 of the main PCB (102/201). - Now adjust the scale completely by: adjusting the zero point offset value checking the off-center load adjusting the linearity adjusting the overload stops and calibrating the scale - Place the front plate (101/208) along with the main PCB (102/ 201) into the rear panel of the display head (104/203) and fasten them from the back using the 4 screws (104.A). - Place the 4 caps (105/204) on the bore holes to cover the screws. - Now the scale is ready to operate. 32 Quality / Tolerance Status 01 / 93

33 Table of Test Points Pos. Test Point Instrument Meas. Range / Setting Readout D1 Input voltage Digital voltmeter 200 V DC approx V V D2 Supply voltage Digital voltmeter 20 V DC approx. + 5 V D3 Supply voltage Digital voltmeter 20 V DC approx V D4 Supply voltage Digital voltmeter 20 V DC approx V D5 Supply voltage Digital voltmeter 20 V DC approx. - 5 V D6 Amplifier voltage Digital voltmeter 20 V DC D7 Low-pass filter output Digital voltmeter 20 V DC V V V V... *) V V V V... *) D8 Reference voltage Digital voltmeter 20 V DC approx V O1 Control voltage Oscilloscope 2 V / Div. DC 0.2 ms / Div. O2 Discharge voltage Oscilloscope 2 V / Div. DC 0.2 ms / Div. O3 Comparator input Oscilloscope 2 V / Div. DC 0.2 ms / Div. O4 Comparator output Oscilloscope 2 V / Div. DC 0.2 ms / Div. Ground *) Range of TS VQ1 Status 01 / 93 Quality / Tolerance 33

34 Overview of the Test Points SAT Quality / Tolerance Status 01 / 93

35 Data Interface YDO 01 TS How to Install the Data Interface - Open the display head (see page 16). - Unscrew the cable clamp (103/202). - Insert the interface cable in the rear panel of the display head (104/203) and tighten the seal (109.A). - Fasten the interface cable along with the weighing system interface cable using the cable clamp (103/202). - Plug the interface cable into position St.1 of the main PCB (102/ 201) and replace the shields on the blank ground connector ( ). - Replace the front plate (101/208) along with the main PCB (102/ 201) in the rear panel of the display head (104/203) and fasten them from the back using the 4 screws (104.A). - Place the 4 caps (105/204) on the bore holes to cover the screws. - Now the scale is ready to operate. Status 01 / 93 Quality / Tolerance 35

36 General Specification Type of interface Operating mode Standard Handshake line Initialization Character coding Transmission rate Parity Synchronization Additional port lines for over / under checkweighing Serial data in both directions Asynchronous, simplex V 24 - V 28, RS 232 C-S Clear to Send (CTS) Data Terminal Ready (DTR) External or automatic print command depend on the Code selected (8 1 to 8 4) 7 Bit ASCII 1,200 baud Odd 1 start bit, 1 stop bit for tolerance and target Data Output Format Z Z Z Z Z Z g _ k g _ CR LF o z t 1st character Plus or minus sign or space 2nd to 4th characters Space 5th to 10th characters Digit, space or decimal point 11th character Space 12th to 14th characters Letter or space 15th character Carriage return 16th character Line feed Data Output Parameters Codes 8 1 to 8 4 Data can be transferred to the output port depending on the particular stability state of the weighing system (stability parameter). You can choose to have data transferred at stability only or regardless of stability. If you opt to have data transferred only when the weighing system has stabilized, an output command will remain stored until the system has stabilized. For the auto print stetting, weight data are continously transferred. If you have additionally selected the stability parameter for this option, only data with a stability symbol will be output. Data is output continously the moment you turn on the power. To stop and start automatic data transfer, press the print key. 36 Quality / Tolerance Status 01 / 93

37 Data Output and Pin Assignment Each signal received by the RxD line will initiate data transfer. Female Interface Connector: 25-position D submini DB25S with screw lock hardware for cable gland. Male Connector Required 25 pin D submini, DB25S, with integrated shielded cable clamp assembly (Amp type ) and fastening screws (mate screws for female screw lock, Amp type ). Pin Assignment Interface Connector Connector St.1 on Main PCB Description Direction Pin 1 St.1 / 1 Protective Ground Pin 2 St.1 / 10 Data Output (TxD) Output Pin 3 St.1 / 11 Data Input (RxD) Input Pin 4 Not Connected Pin 5 St.1 / 9 Clear to Send (CTS) Input Pin 6 Not Connected Pin 7 St.1 / 1 Internal Ground Pin 8 St.1 / 1 Internal Ground Pin 9 Not Connected Pin 10 Not Connected Pin 11 St.1 / V 50 ma Output Pin 12 St.1 / V 50 ma Output Pin 13 St.1 / V 230 ma Output Pin 14 St.1 / 1 Internal Ground Pin 15 St.1 / 12 Print Input Pin 16 St.1 / 5 Low Signal / Tare ¹) Output / Input ¹) Pin 17 St.1 / 6 OK Signal Output Pin 18 St.1 / 7 High Signal Output Pin 19 St.1 / 4 Set Signal Output Pin 20 St.1 / 2 Data Terminal Ready (DTR) Output Pin 21 Not Connected Pin 22 Not Connected Pin 23 Not Connected Pin 24 Not Connected Pin 25 St.1 / V Output ¹) Pin 16 can be used as either a low signal (control output) or a hardware tare command (input). You can modify pin 16 accordingly by changing the position of solder strap LB5. Pin 16 is factory-set as a low signal. Important Note (only regarding modification of the pin assignments according to foot note ¹)) When altering solder strap LB5, please be aware that the factory settings have been adjusted with traces and not with soldering points. Therefore, first open the trace of the particular solder strap and then adjust the setting using a soldering point. Status 01 / 93 Quality / Tolerance 37

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