Technical Information

The technical information page includes basic answers to Frequently Asked Questions on our products. If there is anything you would like us to include in this section of the website, please let us know. Note that calibration instructions for the main models are shown in a separate section - click here for the index.

Frequently Asked Questions

Good Scale

How do I adjust span and zero on the pot calibration models?
How does the calibration procedure for machines with keyboard calibration differ?
How do I fit a replacement A/D board?

UWE

How do I fit a new UWE board?
What is the "dealer calibration" procedure for UWE machines?
What is the standard end user calibration procedure for UWE machines?
What is the calibration procedure for HGS type machines?
What are the load cell connections for UWE machines?
How do I disable the auto cut-off on a UWE scale?
How do I switch between low and high resolution on the LM series?
How do I change the capacity and division size on an APF?

Shinko

How do I adjust linearity?

Soehnle

What is the correct charging procedure for the Soehnle 7741/2/3 models?

Nagata

Why does the calibration routine not work?
How do I set the capacity after fitting a new board?

Good Scale FAQs

How do I adjust span and zero on models with pot calibration?

Rear view of early floor model version with battery test switch. Note: on the bench model the span pot is next to the on/off switch and the zero pot is inside the cover. Span resistor is R11. Very early models cannot display the zero count figure, it is done by trial and error - too high and it won't go to full capacity, too low and it won't zero.

Side view of "A" and "S" types (floor model). Clockwise adjustment speeds it up. On bench models, zero pot is on A/D board inside cover. If you run out of adjustment, change resistor R14 - the higher the resistance, the faster it will go. Zero count figure is around 2,500. Press SET key followed by 7 key to display the value.

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How does the calibration procedure for machines with keyboard calibration differ?

With chip versions EN-10 and after the calibration procedure has been modified:

1. At step 5 the display used to prompt the operator with a suggested calibration weight which could be altered through the keyboard.
2. As from now the scale shows "L 0" at which point the user can enter a calibration weight of his choice.
3. If the scale is 1500, 3000 or 6000 grams capacity the value is entered in grams. If it is 15kg or above the value is entered in kg.
4. Calibration then continues as before.

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How do I fit a replacement A/D board?

Your existing A-D board is probably an older version. The new board will fit as a straight swap. You will need to take the black and red wires from your existing mains adaptor socket and solder them to the connections shown: D+ red D- black An earth tag should also be fitted between the black wire on the main socket and the chassis of the scale.

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UWE FAQs

How do I fit a new UWE board?

1. Remove Resistors R1A & R1B (where fitted) from your old board and fit them onto your new one
2. Fit the EPROM from the old board onto the new one
3. Check both boards and transfer any other missing components from the old board to the new
4. Perform the dealer calibration (see below)

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What is the "dealer calibration" procedure for UWE machines?

The following outlines the generalised dealer calibration procedure for the majority of UWE models. Some models use a "TARE" key, others use a "SAMPLE" key. This procedure does not apply to the HGS type - for this, see below.

1. Switch on the scale while holding down the TARE/SAMPLE key, the display will show F1.
2. Press the MODE key, the offset value or "internal count" will be displayed, this figure should be adjusted using the trimpot VR1. The correct figure for most models is 10,000 except for the EBW & GM series models which are set to around 5000.
3. Press the ZERO key, the display will "Zero off".
4. Press the TARE/SAMPLE key, now press the ZERO key, wait a few seconds, press the TARE/SAMPLE key again, now press the ZERO key.
5. A small arrow or ring should have appeared to the right of the display.
6. Now place the lower calibration weight on the scale, this is usually one third of the capacity of the scale. ( The value of this weight can be determined by following the user calibration procedure below ). The display should be showing a value of around 11,000. ( Except EBW & GM series ). Now press the MODE key, the scale will calibrate itself, show "DONE" and return to the weighing mode.

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What is the standard end user calibration procedure for UWE machines?

1. Switch the scale on while holding down the MODE key, the display will show "CAL?"
2. Press the MODE key again, the display will show "YES" then "LOAD" and then change by itself and alternate between two acceptable calibration weights, choose one of these weights and place it on the scale.
3. The scale will now self calibrate and return to the weighing mode.

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What is the calibration procedure for HGS type machines?

1. Switch scale on while holding down the middle key on the top row of buttons, display will show F1
2. Press the left-hand button on the top row, the internal count will now be displayed, set this figure to 10,000 using VR1 pot.
3. Switch off the scale, now switch on again while holding down the left hand button on the top row, the display will show "CAL- ZERO", the display will change by itself ( this can take a while ) to show "LOAD-span" followed by a choice of two acceptable calibration weights, choose your preferred weight and place it on the scale. After a while the display will show done and return to the weighing mode.

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What are the load cell connections for UWE machines?

The machines may be fitted with different makes of load cell with differently coloured wiring, and a replacement would not necessarily be of the same type. The connections for the different makes are as follows:

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How do I disable the auto cut-off on a UWE scale?

1. Press TARE and switch on.
2. Display shows "F1".
3. Press tare key 3 more times. Display will show "F4".
4. Press MODE key. Display will show "4-off".
5. Press MODE key again. Display will show "0-off".
6. Switch off and on again.

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How do I switch between low and high resolution on the LM series?

To switch between high and low resolution on the UWE LM series (e.g. for the LM-600 switch between 100g and 200g divisions):

1. Hold down the TARE key when switching on. Display shows "F1".
2. Press the TARE key until "F3" shows.
3. Hold down the MODE key until the display shows the capacity.
4. Press the MODE key again to select the required division.

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How do I change the capacity and division size on an APF?

1. Hold down the TARE key and switch on, display shows F1, press TARE key until F3 is shown.
2. Press the MODE key, display shows "oiml" press the ON-ZERO key, display shows "norm". (Select oiml for a stamped scale or norm for a non stamped version)
3. Press the MODE key, display shows "type", press the MODE key again.
4. Display shows "dp", use the ON-ZERO key to select the correct decimal place and the press the MODE key.
5. Display now shows "CAP_2?" press the ON-ZERO key, the display will now show the current capacity and division size with the left hand digit flashing.
6. Use the TARE key to move the flashing digit along, use the ON-ZERO key to change the flashing number to the desired setting. It is important to move the flashing digit all the way along to the far right hand end even if you are not changing the division size otherwise the changes will not be saved.
7. When the correct capacity and division size has been selected press the MODE key.
8. The display will now show "CAP_1?", just press the MODE key again. The display will show F4. Switch the scale off.
9. Switch the scale back on, all your changes should have been saved but the scale may require recalibration especially if the division size or decimal place have been changed.

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Shinko FAQs

How do I adjust linearity?

The scale will now revert to weighing mode. Switch it off and remove the weights. Switch it back on and test it again. Any small span errors can be adjusted using the standard cal. routine.

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Soehnle FAQs

What is the correct charging procedure for the Soehnle 7741/2/3 models?

To properly charge the batteries on these scales the following procedure should be followed.

Plug the charger unit in and switch on at the mains, the red L.E.D. Charging light should come on, now plug the lead into the scales, when the red light goes out the batteries should be fully charged, the charging procedure takes approximately 8 hours to complete.

Plugging the lead into the scales before switching on at the mains will not charge the batteries; this procedure will run the scales directly from the adaptor/charger only.

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Nagata FAQs

Why does the calibration routine not work?

On some of the earlier models, the instructions in the manual do not work. Try the standard calibration procedure, as follows.

To enter calibration mode:

• Hold down the LOCK key and switch on.
• Keep the LOCK key held down until the display shows 1.
• Press the ZERO key and the display shows 2.
• Press the LOCK key again and the display shows 3.
• Press the ZERO key again and the display will show 123 (on some models, the display will count backwards).
• Switch off the scale.

To calibrate:

• Hold down the LOCK key and switch on.
• On earlier models, the display circulates and shows the calibration load. Release the LOCK key.
• On later models, the display counts backwards. Release the LOCK key and the display shows C4 followed by the calibration load. This can be changed by pressing the CHANGE key to select the digit and pressing the ZERO key to change the value.
• With the calibration load shown in the display, apply the test weights and press the LOCK key.
• The machine will self-calibrate, go through test mode and then display the applied weight. Switch off the scale.
• Switch the scale back on and retest.

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How do I set the capacity after fitting a new board?

To enter configuration mode:

• Hold down the CHANGE key and switch on. Release the key when the display shows 7.
• Press the LOCK key. The display will show 8.
• Press the CHANGE key again. The display will show 9.
• Press the LOCK key again. The display will show 789.
• Switch off the scale.

The change the configuration:

• Hold down the CHANGE key and switch on. Release the key when the display shows C1.
• The display will show 30.000. Set the number to the required capacity including any digits after the decimal point (e.g. a 1500kg x 0.5kg scale would be set to 15000). Select the digit by pressing the CHANGE key and change the value with the ZERO key.
• Press the LOCK key to set the required capacity. The display will show C2 followed by the data you have entered.
• Use the ZERO key to move the decimal point to the correct position.
• Press the LOCK key. The display will show C3 followed by the division size.
• Press the ZERO key to select the required division.
• Press the LOCK key to set the division. The display will show C4 followed by 30.000.
• Set the calibration load as in step 2. Apply the calibration load and press the LOCK key. The scale will self-calibrate, go through the test mode, and display the applied load.
• Switch the scale off, remove the load, switch back on and re-test.

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