Removal Of Signal Unit A1 - Fluke Autoranging CombiScope PM3370B Service Manual
Instrument
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Also See for Autoranging CombiScope PM3370B:
- User manual (297 pages) ,
- User manual (298 pages) ,
- Reference manual (133 pages)
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CORRECTIVE MAINTENANCE PROCEDURES
8.5.3
Removal of signal unit A1
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Remove 3 screws with washers that fix the printed circuit board to the chassis plate.
-
Remove 1 long screw that fixes (and grounds) the screen of the input attenuators to the chassis
plate.
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Unplug the blue ribbon cable.
-
Lift the rear side of the unit over the plastic stud and slide the unit backwards: the unit becomes
loose from the chassis now.
NOTE: The unit can be toppled over. The SMD component side is accessible now and can be
measured in working condition after reinstallation of the blue ribbon cable. Figure 8.4 shows
this.
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Unplug the white ribbon cable and the coaxial delayline connector.
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Unplug the connectors for the output options (MTB gate, DTB gate, MTB sweep) if they are
present in the instrument.
-
Remove the unit from the instrument.
For removal of the screen of the attenuators proceed as follows:
Pull off the plactic bracket between the BNC inputs.
Remove the two screws between the BNC's.
Remove the two screws in the sides of the screening plate.
Figure 8.3
Signal unit in position to measure SMD component side
8 - 5
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