PROline Promass 80 9 Trouble-shooting
Endress+Hauser 73
9.7 Removing and installing printed circuit boards
Field housing: removing and installing printed circuit boards (Fig. 28)
#
Warning:
• Risk of electric shock. Exposed components carry dangerous voltages. Make sure
that the power supply is switched off before you remove the cover of the electronics
compartment.
• Risk of damaging electronic components (ESD protection). Static electricity can
damage electronic components or impair their operability. Use a workplace with a
grounded working surface purposely built for electrostatically sensitive devices!
• If you cannot guarantee that the dielectric strength of the device is maintained in the
following steps, then an appropriate inspection must be carried out in accordance
with the manufacturer’s specifications.
1. Unscrew cover of the electronics compartment from the transmitter housing.
2. Remove the local display (1) as follows:
– Press in the latches (1.1) at the side and remove the display module.
– Disconnect the ribbon cable (1.2) of the display module from the amplifier board.
3. Remove the screws and remove the cover (2) from the electronics compartment.
4. Remove power unit board and I/O board (4, 6, 7):
Insert a thin pin into the hole (3) provided for the purpose and pull the board clear
of its holder.
5. Remove amplifier board (5):
– Disconnect the plug of the sensor signal cable (5.1) including S-DAT (5.3) from
the board.
– Gently disconnect the plug of the excitation current cable (5.2) from the board,
i.e. without moving it back and forward.
– Insert a thin pin into the hole (3) provided for the purpose and pull the board clear
of its holder.
6. Installation is the reverse of the removal procedure.
" Caution:
Use only original Endress+Hauser parts.
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