PROline Promass 80 9 Trouble-shooting
Endress+Hauser 75
Wall-mount housing: removing and installing printed circuit boards (Fig. 29)
#
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!
1. Remove the screws and open the hinged cover (1) of the housing.
2. Remove the screws securing the electronics module (2). Then push up electronics
module and pull it as far as possible out of the wall-mount housing.
3. Disconnect the following cable plugs from amplifier board (7):
– Unplug sensor signal cable (7.1) including S-DAT (7.3)
– Unplug excitation current cable (7.2). Gently disconnect the plug, i.e. without
moving it back and forward.
– Unplug ribbon cable (3) of the display module
4. Remove the screws and remove the cover (4) from the electronics compartment.
5. Remove the boards (6, 7, 8, 9):
Insert a thin pin into the hole (5) 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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