Replacing The Keypad Overlay; Replacing The Ac Adapter; Replacing The Analog Board - KERN FTB Service Manual

6.3

Replacing the keypad overlay

• Lift the defective keypad overlay by a corner and gently peel it off.
• Carefully remove all traces of adhesive with, for example, a wooden or plastic scraper. Caution: Make sure not to
damage the keypad membrane of KMT-TM terminals!
• Carefully clean the windows of the keypad overlay and the display mounting plate.
• Peel off protective film from new overlay.
• Center the keypad overlay on the display mounting plate and press down uniformly.
6.4

Replacing the AC adapter

Note: The AC adapter has a fuse as overcurrent protection. For safety reasons this fuse cannot be replaced, and the AC
adapter must therefore be completely replaced if the fuse blows or the AC adapter is defective.
• Open terminal, remove OptionPac (if present) (Chapter 6.2).
• Peel output cable of AC adapter off analog board. Battery-operated scales only: The output cable of the AC adapter is
plugged into the charging circuit board of the OptionPac and is usually already removed when the OptionPac is
disassembled (Chapter 6.2).
• Remove AC adapter from wall of housing (attached by adhesive patch). If necessary, carefully insert a flat blade (knife or
screwdriver) between AC adapter and housing and detach AC adapter. Remove all traces of adhesive from housing.
• Undo the 6 screws holding the RS connector plate in place (rear panel of terminal) and remove the plate. (Caution: cable
connections!).
• Remove power cord grommet of AC adapter from RS connector plate. Remove AC adapter from terminal.
• Attach new adhesive patch to housing wall and peel off protective film.
• Place new AC adapter in terminal and press onto adhesive patch.
• Locate the power cord grommet (with its closed side facing up!) in the center of the blanking plate slot, then press the
grommet down thoroughly. This requires a fair amount of force which is intended as it ensures proper IP protection.
Caution: Never use a hammer or similar tool for pushing the grommet into place because this may damage the
wires! Once the grommet is properly located in the slot you may fasten the blanking plate.
• Plug AC adapter output cable onto analog board. Battery-operated terminals: The output cable of the AC adapter must
be plugged onto the charging circuit board in the OptionPac.
• Install terminal/OptionPac (Chapter 6.2).
6.5

Replacing the analog board

• Open terminal, remove OptionPac (if present) (Chapter 6.2).
• Disconnect the load cell connection cable and all other cable connectors from analog board. Tip: Make a note of the
cable connections!
• Pull off the spring clip and the EMC clamp from the analog board and remove it.
• Fit new analog board and fasten in place with the spring clip and the EMC clamp.
• Plug the load cell connection cable and all other cable connectors onto the analog board.
• Close terminal, mount OptionPac (if present) (Chapter 6.2).
Caution: After replacing the analog board all scale data and user settings must be reentered, because they are saved
in the EAROM on the analog board! When they have been reentered, the weighing system must be calibrated/
linearized. These operations are described in Chapter 7 of the this service manual.
50 FTx/ITx-SH-e-0720