46 FTx/ITx-SH-e-0720
5.7.4 Replacing the digital PCB
• Remove the LCD and backlighting unit as described in the previous chapter.
• Fit LCD and backlighting unit onto the new digital PCB (Chapter 5.7.3).
After the digital PCB has been replaced, the application software of the scale has to be downloaded into the flash memory of
the digital PCB (refer to Chapter 9 of this service manual). If the software was not loaded successfully via the PC, the complete
digital PCB with the soldered-on flash memory chip has to be replaced.
5.7.5 Final reassembly
• Connect the RS232 cable and the cable from the analog PCB to the digital PCB.
• Engage the display unit or the LCD module under the rear snaps of the display mounting plate and then lower its front edge
until it snaps into place. Fit the red retaining screw(s) (since September 2005).
Caution: The red screw is used for adjusting. It must first be tightened completely and then loosened by half a rotation.
If this is not done, the pushbuttons on the digital PCB are too close to the display insert and can no longer be pressed.
The distance between the pushbuttons of the digital PCB and the display insert can be modified by means of this red
adjusting screw. An additional manual keyboard test must always be carried out. In this context fine adjustment also has
to be carried out with the adjusting screw.
Caution: On FTB the LC display is only held in the connector strip on one side. Because of this, for assembly of the PCB,
the display, and the backlighting must be held together by hand, otherwise the backlighting may come out of the drilled
holes in the PCB and be displaced!
• Install both EMC clamps.
• Replace the bottom plate and adjustable feet.
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