Removing And Installing Printed Circuit Boards - Endress+Hauser PROline prosonic flow 90 Operating Instructions Manual

PROline Prosonic Flow 90
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Endress+Hauser
9.7

Removing and installing printed circuit boards

Warning!
x 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.
x 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!
x 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.
Procedure (Fig. 50):
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)
– Unplug ribbon cable (3) of the display module
4. Remove the cover (4) from the electronics compartment by loosening the screws.
5. Removal of boards (6, 7, 8):
Insert a thin pin into the opening (5) and pull the board out of the holder.
6. Installation is the reverse of the removal procedure.
"
Caution!
Use only original Endress+Hauser replacement parts.
9 Trouble-shooting
83