KERN FTB Service Manual

Also see for FTB: Operating instructions Operating instructions

Contents

KERN FTB Service Manual Manual pdf 41 page image

42 FTx/ITx-SH-e-07205 Replacing components with compact scales5.1 Important notesThis section describes how to change individual components of the compact scales. When doing this, please refer to theexploded view drawings and spare parts lists in Chapters 2 and 3. Important: After replacing components, a functional checkof the scale must always be carried out.5.1.1 Safety and environmentThe following instructions must be observed for all repairs:– Disconnect the scale from the power supply before starting repair work!– The scale contains electronic components which can be damaged by electro-static discharges. You must therefore always wear a grounded wriststrapwhen performing repair work! Grounded wriststraps can be purchased fromspecialist electronics dealers.– Defective components must be disposed of according to the instructions inChapter 1!• Servicing work in explosion hazard zones is strictly prohibited. Ignitionpower could inadvertently be generated, causing an explosion. Servicing workshould therefore only be undertaken in secure areas. The location in whichthe scale is installed must be declared by the system operator to be safe for theduration of the repair work. If no such declaration is available, the scale must beswitched off and disconnected from the power supply and moved to a safe area.• The scales can also be disconnected and reconnected to the power supply inpotentially explosive environments provided that the power supply has first beenswitched off.5.1.2 Tools and working aids– Screwdrivers: Torx T10, T20, T25, and T30; Phillips 5 mm; flat type size 4– Torque wrench up to 10 Nm– Wrench heads Torx T25, T30, and hex 17 mm– Open-end wrench, size 20– Feeler gauge– Carpet knife (“cutter”)– Grounded wriststrap (as protection against electrostatic discharges)– Weights of class M1 or F15.1.3 Work instructionsTake great care when inserting and tightening screws into holes tapped directly into the aluminum casting: After inserting thescrew, always turn it first about 1 turn counterclockwise until it engages in the existing thread, and only then screw it tight! Donot tighten the screw too much, since this may damage the thread in the aluminum casting!