KERN FTB Service Manual

Also see for FTB: Operating instructions Operating instructions

Contents

KERN FTB Service Manual Manual pdf 42 page image

FTx/ITx-SH-e-0720 435.2 Replacing the keypad overlay• Lift up the defective keypad overlay (if necessary carefully prying it up with a knife) and gently peel it off the scale.Caution: take care that the specification label is not damaged when the membrane is removed!• Carefully clean display mounting plate and window (removing all traces of adhesive).• Make sure that the specification label is in its correct position (must be visible through the window in the keypad overlay),then peel off the protective film from the new overlay and carefully affix the latter to the display mounting plate.• Press the keypad overlay down uniformly.5.3 Replacing the AC adapterNote: The AC adapter has a fuse as overcurrent protection. For safety reasons this fuse cannot be replaced, and the AC adaptermust therefore be replaced completely if the fuse blows. This applies only to scales that are connected directly to the AC powerline (without rechargeable battery and external AC adapter).• Unscrew the adjustable feet and remove them.• Undo the bottom plate retaining screws, removing them and the plate itself.• Disconnect the AC adapter cable from the analog PCB.• Remove the AC adapter (held on by an adhesive patch) from the wall of the housing. If necessary, carefully insert a flatblade (knife or screwdriver) between adapter and housing and pry them apart. Remove all traces of adhesive from thehousing.• Undo the screws holding the RS connector plate in place (rear panel of scale) and remove the plate.• Slide the AC adapter power cord grommet out of the RS connector plate. Remove the AC adapter from the scale.• Place the new AC adapter in the scale and fix it in place with the adhesive patch.• Slide the power cord grommet into the slot of the RS connector plate and screw the plate in place.Note for scales with IP65 protection: Check that the seal of the connector plate is still correctly fastened to the housing. Ifit is not, the seal must be replaced as follows: Remove the existing seal from the housing so as to leave no trace. Clean anddegrease the surface to which it was fastened. Carefully affix the new seal to the housing in exactly the right position.• Plug the AC adapter output cable onto the analog PCB.• Replace the bottom plate and the adjustable feet.5.4 Replacing the batteryNote: This procedure is only required for scales that have a built-in battery and an external AC adapter (“AccuPac” version).• Unscrew the adjustable feet screws and remove them.• Undo the bottom plate retaining screws, removing them and the plate itself.• Undo the screws holding the RS connector plate in place (rear panel of scale) and remove the plate.• Slide the charging PCB out from the guide and remove both plugs on the PCB (connection cable to battery or analog PCB).• Remove the battery from the wall of the housing (held in place by the adhesive strip). If necessary, carefully insert a flatblade (knife or screwdriver) between the battery and housing and pry them apart. Remove all traces of adhesive from thehousing.• Remove the battery from the scale and disconnect the cable to the charging PCB.• Attach the adhesive patch to the wall of the housing, remove its protective foil, place the battery in the scale and press it