Siemens 7MB3000 Series Operating Instructions Manual page 150

Maintenance and servicing
11.7 Replacing the processing module
③
Processing unit (PU)
⑬
Screw
⑭
Printed circuit board holder
⑮
Screw
Figure 11-4 Replacing the processing unit
1. Isolate the device from power.
2. Loosen the six screws and open the door.
3. Loosen the three screws and remove the shield plate
4. Pull out the connectors for the following cables depending on the installation situation:
– Power cable
– 26-pin ribbon cable to display
– 12-pin ribbon cable to analyzer modules AM and option module OM 2.2
– 50-pin ribbon cable to option module OM 1.1
– 26-pin ribbon cable to the analyzer modules
– Connecting cable to the terminal block (TB)
5. Loosen the screws
6. Loosen the screw
7. Loosen the two screws
150
⑯
⑰
⑱
⑲
①
④
⑮ ⑱
and . Remove the electronics base plate
⑬
and remove the printed circuit board holder
⑯
and remove the processing unit
Screws (2 units)
Electronics base plate
Screw
Shielding plate
⑲
.
⑤
⑪⑫
⑦⑧⑨
③
.
Operating Instructions, 07/2023, A5E31930403-AB
②
⑰
.
⑭
.
Wall-mounted device