Corrective Maintenance Procedures - Fluke PM3082 Service Manual

CORRECTIVE MAINTENANCE PROCEDURES

8 CORRECTIVE MAINTENANCE PROCEDURES
8.1 DISMANTLING THE INSTRUMENT
8.1.1 General information
This section contains the dismantling procedures required for the removal and testing of components
during repair.
All circuit boards removed from the instrument must be adequately protected against damage, and
all normal precautions regarding the use of tools must be observed.
During the dismantling a careful note must be made of all disconnected leads so that they can be
reconnected to their correct terminals during assembly.
CAUTION: Damage may result if:
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8.1.2 Removing the cabinet and carrying handle
Note: The cabinet does not need to be removed to do the calibration adjustment procedure.
To remove the cabinet proceed as follows:
- Fit the front cover on to the instrument.
- Hinge the carrying handle clear of the front cover.
- Place the instrument with the front cover on a flat surface.
- Pull off both plastic parts that are around the instrument's rear feet.
- Remove the screws (6) that secure the cabinet to the instrument's rear panel.
- Gently slide the cabinet (and carrying handle) off the instrument.
ATTENTION: -
The rotation points of the carrying handle are secured by means of metal 'omega' clips. After removal
of these clips the handle can be removed by pulling both handle ends outwards away from the
instrument.
8.2 REPLACEMENTS
WARNING: The Extremely High Tension (EHT) cable is directly connected to the EHT-
The instrument is swltched-on when a circuit board has been removed.
A circuit board is removed within one minute after switching-off the
instrument.
When installing the cabinet again, special care must be taken that cables are not
damaged between the cabinet and the chassis. This is especially important for the
flat cable above the Cathode Ray Tube (CRT) that connects Front unit A4 and CRT
controls unit A5.
- Also take care that the cabinet fits well into the plastic front frame and that
grounding fingers are not damaged during installation.
multiplier unit. When the EHT cable to the post-acceleration anode Is
disconnected, the cable must be discharged by shorting the terminal to the
instrument's earth.
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