Repairing The Optionpac - KERN FTB Service Manual

6.7

Repairing the OptionPac

6.7.1 Replacing the battery
Note: This section relates only to terminals which have an OptionPac with built-in battery.
• Remove the base plate of the OptionPac (8 screws, Torx T20).
• Remove battery from wall of housing (attached by adhesive patch). If necessary, carefully insert a flat blade (knife or
screwdriver) between battery and housing, then release AC adapter. Remove all traces of adhesive from housing.
• Lift battery out of OptionPac and pull off cable connecting to charging circuit board.
• Fasten adhesive patch to wall of housing, peel off protective film, place battery in OptionPac and press latter against wall
of housing.
• Check all cables are correctly laid. The cables must lie in the correct recesses in the housing so they are not trapped by
the base plate.
• Screw the base plate of the OptionPac on again.
6.7.2 Replacing the charging circuit board
Note: This section relates only to terminals which have an OptionPac with built-in battery. The charging circuit board has an
electronic overload protector which automatically resets after being activated.
• Remove base plate of OptionPac (8 screws, Torx T20).
• Pull off cable from battery (blue plug), then remove the two snap fasteners of the charging circuit board and carefully lift
the board out of the housing.
• Undo all cable connections on charging circuit board.
• Plug cable onto new charging circuit board and place board in housing.
• Fasten board with the two snap fasteners and plug cable into battery (blue plug).
• Screw base plate of OptionPac on again.
6.7.3 Replacing the analog option board
Note: This section relates only to terminals fitted with an OptionPac containing the analog option for connecting a second
weighing platform.
• Remove base plate of OptionPac (8 screws, Torx T20).
• Undo all cable connections on the analog option board. Tip: Make a note of the cable connections.
• Undo the 4 screws fastening the board (Torx T10) and remove the board.
• Using a suitable tool, remove the EPROM from its socket and fit on the new board. Caution: The chamfered corner of the
EPROM must be aligned with the chamfered corner of the socket (see marking)!
• Place new board in housing and fasten with screws.
• Plug in all cables on the analog option board.
• Screw the base plate of the OptionPac on again.
Caution: After the analog option board has been replaced, all the data and user settings for the second weighing
platform must be reentered, because these are stored in the EAROM on the board! The second weighing platform must
then be calibrated and linearized. These steps are described in Chapter 7 of this service manual.
FTx/ITx-SH-e-0720 53