OHAUS ST300 Service Manual

Also see for ST300: Instruction manual Instruction manual

Contents

CHAPTER 2 MAINTENANCE PROCEDURESStarter Series Portable Meter Service Manual 2-1 Ohaus Corporation www.ohaus.com2.1 PREVENTIVE MAINTENANCEATTENTION: remove the AAA batteries before cleaning the meter.Ohaus meters are precision instruments and should be carefully handled, stored in a clean,dry, dust-free area, and cleaned periodically.The meter housing may be cleaned with a cloth dampened with a mild detergent ifnecessary.Do not use solvents, chemicals, alcohol, ammonia or abrasives to clean the housing orcontrol panel.2.2 SERVICE STRATEGYAll parts of the Starter 300, 300C, 300D and 400 are designed to be replaced rather thanrepaired. This includes the Main Printed Circuit Board (PCB). For an illustrated list ofreplaceable parts, see Chapter 5.2.3 OPENING THE METERUse these procedures in order to replace the Printed Circuit Board and CR2032 battery, ifapplicable.2.3.1 Separating the Top and Bottom HousingsCommon hand tools are sufficient to disassemble the Starter 300, 300C, 300D and 400meter.1. Remove any electrodes connected to the portable meter.2. Remove the battery compartment and any batteries in the battery compartment.Handle the rubber ring inside the battery compartment with care.3. Turn the meter over. Remove the five screws holding the Housing in place.(See Figure 2-1.)CAUTION: Observe precaution for handling electrostaticsensitive devices.