PROline Promag 50 9Trouble-shooting
Endress+Hauser 99
Wall-mounted housing: removing and installing printed circuit boards (Fig. 49)
#
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 dam-
age electronic components or impair their operability. Use a workplace with a
grounded working surface, purpose-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. Remove the screws and open the hinged cover (1) of the housing.
2. Remove screws of the electronics module (2). Then push up electronics module
and pull it as far as possible out of the wall-mounted housing.
3. Disconnect the following cable plugs from amplifier board (7):
– Electrode signal cable plug (7.1) including S-DAT (7.3)
– Plug of coil current cable (7.2). To do so, loosen the plug locking of the coil current
cable and gently disconnect the plug from the board, i.e. without moving it to and
fro.
– Ribbon cable plug (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):
Insert a suitable tool 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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