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KERN DBS - User Manual

KERN DBS
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KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Service manual
Electronic Moisture Analyzer
KERN DBS
Version 1.0
11/2012
GB
DBS-SH-e-1210

Table of Contents

Questions and Answers

  • G
    gregory46Jul 30, 2025
    What to do if nothing appears on the display of my KERN Measuring Instruments?
    • J
      John WilkersonJul 30, 2025
      If nothing appears on the display, several issues could be the cause. First, check if the power supply voltage is lower than the rating and correct it. Next, inspect the power cord (S17) and replace it if defective. Also, the power board assembly (B4), the main board assembly (B2) or the power supply inlet (B11) might be defective and need replacement. Finally, check the fuse (S18) and replace it if it's blown.
  • L
    Lawrence RobinsonAug 4, 2025
    Why does the display of my KERN Measuring Instruments not change from 'CHK' after turning it on?
    • C
      Crystal CameronAug 4, 2025
      If the display remains on 'CHK' after powering on, it could be due to several reasons. First, ensure proper cable alignment of the unit assembly (1), re-clamping the cable with correct alignment as shown in Fig.27, and ensure the Cable and Ferrite core of the unit assembly (1) do not touch the detector assembly (U11) (Fig.23). Second, check the Pt-Ni band (U17) and reconnect it properly. Finally, the OPF (U1) might be damaged, requiring replacement of the unit assembly (1).
  • M
    Marissa ThompsonAug 10, 2025
    What to do if keys do not function on KERN Measuring Instruments?
    • D
      Dustin BrooksAug 11, 2025
      If the keys are not functioning, it could be due to a defective main board assembly (B2), which would need to be replaced. Alternatively, the case assembly (S2) might not be fastened properly; refasten it to resolve the issue.
  • M
    Marissa AllenAug 16, 2025
    How to reset a forgotten password on KERN Measuring Instruments?
    • E
      egreenAug 16, 2025
      To reset a forgotten password, input 9999 as the password, then press the '?' key and 'ENTER' key simultaneously for 3 seconds. This will reset the password to 9999.
  • L
    logan85Aug 22, 2025
    Why does part of displayed numbers or symbols not appear on my KERN Measuring Instruments?
    • F
      farrelleduardoAug 22, 2025
      If parts of the numbers or symbols on the display are missing, the main board assembly (B2) is likely defective and needs to be replaced.

Summary

Operations for Adjustment

Entering the Service Mode

Disassembling and Assembling the Balance

Precautions

Replacing the Thermal Fuses (S18)

Procedure for removing and installing thermal fuses (S18) in the fuse holder.

Replacing the Main Board Assembly (B2)

Steps to remove and install the main board assembly (B2), including disconnecting cables.

Replacing the Analog Board Assembly (B3)

Instructions for disconnecting cables and removing/installing the analog board assembly (B3).

Replacing the Power Board Assembly (B4)

Procedure for disconnecting cables and removing/installing the power board assembly (B4).

Replacing the Detector Assembly (U11)

Steps to unsolder sensor cables and replace the detector assembly (U11).

Replacing the Force Coil Assembly (L1)

Detailed procedure for removing and installing the force coil assembly (L1).

Replacing the Glass Unit Assembly (S3)

Instructions for loosening bolts and sliding out the glass unit assembly (S3).

Replacing the Thermistor (H10)

Procedure for removing the blind cover and pulling out the thermistor (H10).

Replacing the Thermal Fuse (H6)

Steps to remove the heater frame and replace the thermal fuse (H6).

Checking the Electronic Board

Main Board Assembly (B2)

Analog Board Assembly (B3)

Power Board Assembly (B4)

Hardware Adjustment

Adjusting the Detector Assembly (U11) Height

Procedure to adjust the detector assembly (U11) height using a multimeter and socket head bolts.

Adjusting the Tilt Error

Steps to adjust the tilt error by using shims and adjusting screws on the lever assembly.

Adjusting the Cornerload Error

Procedure for adjusting cornerload error using calibration weights and special tools.

EEPROM Operations

All Initialization (INIT) Operations

Performance Inspection

Repeatability

Cornerload Error

Tilt Error

Troubleshooting

General Corrective Measures

Common problems and their solutions, including display issues, key malfunctions, and errors.

Nothing Is Displayed

Troubleshooting flowchart for when the display shows no output, checking power supply and fuses.

Error Display

List of error codes, their names, and descriptions for diagnosing issues.

Reproducibility of Weight Measurements Is Poor

Flowchart for diagnosing poor weight measurement reproducibility, checking installation and components.

OL or -OL Is Displayed

Lid Open;Close Status Is Not Detected

Heater Does Not Come ON

Does Not Reach Temperature Setting

ERR.124 Occurred

KERN DBS Specifications

General IconGeneral
CalibrationExternal
Power supply230 V / 50 Hz
TypeMoisture analyzer
Auto Power OffYes
Tare FunctionYes
ModelDBS
Readability0.001 g
Weighing range [Max]50 g/120 g/200 g
Sample temperatureUp to 200°C
DisplayLCD
Weighing plate size90 mm
Permissible ambient temperature10 °C / 40 °C
Maximum Capacity220 g
Platform Size90 mm
InterfaceRS-232

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