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CAS AD series - User Manual

CAS AD series
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AD series
SERVICE MANUAL
CAS

Table of Contents

Questions and Answers

  • H
    halljasonJul 27, 2025
    What to do if my CAS AD Scales are not operating (power off)?
    • S
      sarah17Jul 27, 2025
      If your CAS Scales are not turning on, there are several potential causes: * The power ON/OFF key may be damaged, in which case you should check the output voltage while holding the Tact S/W. * The battery may be discharged or not properly connected, so verify the battery connection and voltage. * The fuse may be blown (open), so check the fuse connection. * The power cable could be faulty; in this case, check the output voltage while holding the Tact S/W.
  • S
    Sarah GarciaAug 2, 2025
    Why do my CAS AD show ERROR 0 (unstable error)?
    • K
      kathleen96Aug 2, 2025
      If your CAS Scales display ERROR 0, it might be due to: * The scale not being placed on a flat surface. Ensure all feet are touching a flat surface. * Vibrations or wind affecting the scale. Move the scale to a more stable location.
  • A
    adam36Aug 8, 2025
    What to do if my CAS AD Scales show Batt -> Error 0?
    • M
      Michael MeyerAug 8, 2025
      If your CAS Scales display 'Batt -> Error 0', it could be due to: 1. A damaged ONEMODULE (A/D Converter). Check the battery voltage (C-8) and then perform a battery calibration. 2. The scale not being properly calibrated for the battery. Check the A/D value (C-1). When you place a weight on the scale, the A/D value should change.
  • Q
    qcarrAug 13, 2025
    What to do if my CAS AD Scales show ERROR 1 (initial zero)?
    • A
      Alexander CarrAug 13, 2025
      If your CAS Scales display ERROR 1 (initial zero), the issue may be: * The scale needing calibration. Operate the calibration function. * A loose cable connection between the Loadcell and PCB. Ensure the L/C and PCB are securely connected.
  • S
    Shawn BurchAug 19, 2025
    How to fix ERROR 3 on CAS AD?
    • R
      rhodestrevorAug 19, 2025
      To resolve ERROR 3 on your CAS Scales, remove the weight from the scale.

Summary

CHAPTER-I GENERAL INTRODUCTIONS

A. PREFACE

Introduction to the CAS scale and service manual.

B. PRECAUTIONS

Essential safety and operational precautions for using the CAS scale.

C. SPECIFICATIONS

Technical specifications of the AD series scale models.

D. SEALING METHOD

Procedure for sealing the scale after calibration or service.

CHAPTER-II CALIBRATIONS

A. SET THE CALIBRATION MODE

Steps to enter the calibration mode for the scale.

B. THE MODES

Description of the 5 operational modes for calibration.

C. THE SPAN CALIBRATION

Procedure for performing a full span calibration.

D. THE SPAN CALIBRATION FROM REPAIR

Steps for span calibration after component replacement.

E. THE SPAN CALIBRATION WITH A PARTIAL LOAD

Method for performing a partial span calibration.

CHAPTER-III THE PART REPLACEMENTS

A. REPLACEMENT OF THE LOAD CELL

Procedures for replacing the load cell and related adjustments.

B. REPLACEMENT OF THE ANALOG MODULE

Steps for replacing the analog module and subsequent calibration.

C. REPLACEMENT OF THE DIGITAL MODULE

Procedures for replacing the digital module and inputting data.

CHAPTER-IV THE TRANSFORMER

A. THE TRANSFORMER

Details and specifications of the unit's transformer.

CHAPTER-V THE SCHEMATICS AND THE DIAGRAMS

A. MAIN CIRCUIT DIAGRAM

Schematic diagram of the scale's main electronic circuit.

A. DISPLAY CIRCUIT DIAGRAM

Circuit diagram for the scale's display unit.

B. WIRING DIAGRAM

Diagram illustrating internal wiring connections of the scale.

C. PARTS LOCATION

Layout and identification of major components within the scale.

CHAPTER-VI THE ERROR MESSAGES

ERROR MESSAGE DETAILS

Explanations and troubleshooting for various error codes displayed by the scale.

CHAPTER-VII THE OTHERS

SERIAL INTERFACE PROTOCOLS

Communication protocols and agreements for serial interface.

B. EXPLODED VIEW (MECHANICAL PART)

Exploded view illustrating the mechanical assembly of the scale.

C. FULL PARTS LIST

Comprehensive list of all parts used in the scale assembly.

CHAPTER-VIII APPENDIX-I

DIGITAL MODULE INPUT CODES

Input codes for the digital module and weighing condition settings.

CAS AD series Specifications

General IconGeneral
DisplayLCD
Readability0.1g / 0.2g / 0.5g / 1g
InterfaceRS-232
Operating Temperature0°C to 40°C
Weighing Unitsg, kg, lb, oz
MaterialStainless steel
Capacity6 kg / 15 kg / 30 kg

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