KROHNE GFM 700 EN - Manual (Page 25)

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Figure 5: Display unit (left) / Electronics unit after removal of display unit (right).
8.3.4 Replacement of electronics unit
See the standard Installation and Operating Instructions for detailed information about resetting and
reprogramming the new electronics unit after replacement. Important customer specific data (like the value of the
internal totalizer) should be noted before replacing the electronics unit !
Before commencing work, note the instructions in Section 2.3 ("Before opening").
Then continue as follows:
1. Remove the cover of the electronics compartment.
2. Unscrew the two screws A of the display unit and turn display unit carefully aside or remove the unit
completely by taking out the flat cable connector.
3. Unscrew the two mounting screws B of the electronics unit as well as screw C, which fixes the copper earth
strip at the back of the housing. A screwdriver with a long shaft (200 mm) can best be used to unscrew C
(e.g. screwdriver type Philips No. 2).
4. Pull the electronics unit carefully out of the converter housing, till the SMB connectors of the coaxial cables
can be unplugged easily. Then remove the complete electronics unit.
5. Check the new electronics unit if the voltage setting (only applicable for AC supplies) and power fuse rating
are correct. Change the voltage setting (see section 2.3.3) or exchange the fuse if necessary.
6. Carefully insert the electronics unit till the numbered SMB connectors can be connected to the corresponding
numbered SMB receptacles on the electronics unit. Then mount the unit completely into the housing and fix
the screws. First C, then B and finally screw the display unit on the electronics via screws A, after the flat
cable connector is connected.
7. Screw the cover of the electronics compartment back into the housing.
Note the instructions of section 2.3 ("After opening") during reassembling.
IMPORTANT !
Carefully keep the coaxial cables to the side of the housing, while inserting or removing the electronics unit
into respectively from the converter housing. This is to prevent damaging of the coaxial cables !
A
A
C
B
B
Display unit
Flat cable of
display unit
Copper earth strip