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6.6 Replacing the display mounting plate, display unit, and digital board
The display mounting plate is located underneath the keypad overlay and is attached to the scale housing by 6 snaps. The
display unit comprises the digital PCB, the liquid crystal display (LCD) and the backlighting unit. It is held in place on the
mounting plate and the housing by snaps and screws. The digital PCB is connected to the analog PCB and the RS232C
interface by two ribbon cables (on KMT-TM terminals there is an additional cable for the keypad).
6.6.1 Preliminary work
• Open terminal, remove OptionPac (if present) (Chapter 6.2).
• Undo the two screws (Torx T10) fastening the digital board to the display mounting plate.
• Push back the two (small) black snaps at the front of the display mounting plate and slowly raise the digital board until
it is vertical. Carefully pull the digital board vertically upward and out of the rear snaps.
• Disconnect all cables from the digital board, then remove the board. Tip: Make a note of the cable connections.
KMT-TM only: The membrane cable for the keypad of the KMT-TM (numeric keypad) must also be disconnected from the
digital board. Use a soft felt pen to mark first the membrane cable and then the plug, so you know afterwards how the
cable has to be plugged in. Then slightly pull out the two small black snaps on the left and right of the plug. This releases
the spring mechanism of the plug, and the cable can be pulled off.
6.6.2 Replacing the display mounting plate
Note: In order to replace the display mounting plate, the keypad overlay must be removed. This cannot be reused, and must
therefore also be replaced. On KMT-TM terminals the membrane keypad, which is fastened to the display mounting plate,
must also be replaced.
• Remove keypad overlay (Chapter 6.3).
• Push the 3 cantilever snaps at the front edge of the display mounting plate backwards to release the plate and remove it
to the outside.
• Insert the new display mounting plate into the aperture so that it clicks into place.
• KMT-TM only: Peel the protective film off the new membrane keypad and carefully apply the membrane keypad to the
display mounting plate. Pass the membrane cable through the aperture and into the inside of the terminal.
• Apply the new self-adhesive keypad overlay (Chapter 6.3).
6.6.3 Replacing the liquid crystal display (LCD) and/or the backlighting unit
• Place the display unit with the digital board downwards on a conductive CMOS film.
• Unplug the backlighting ribbon cable from the digital board.
• Carefully insert a flat-bladed screwdriver (size 4) between the digital board and the backlight unit immediately adjacent
to the connectors. Tip: Use an electrician’s screwdriver with an insulated shaft as this reduces the risk of causing
damage.
• Use the screwdriver to pry the liquid crystal display and the backlighting unit out of the socket strip(s). When doing this,
lever the shaft of the screwdriver against the edge of the digital board. Never lever the tip of the screwdriver
against the surface of the digital board, as this could damage the board!
• Peel off the upper protective film of the new backlighting unit.
• Place the new backlighting unit onto the digital board. Two of the four feet of the backlighting unit are in the form of pins.
These pins must be inserted into the corresponding holes in the digital board.
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