Promass 40 9 Trouble-shooting
Endress+Hauser 45
9.7 Removing and installing printed circuit boards
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. 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 (3) from the electronics compartment.
4. Remove power unit board and I/O board (4, 6):
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.
– Disconnect the plug of the excitation current cable (5.2) from the board.
– 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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