User guide

M4000 Insulation Analyzer User Guide
72A-1230 Rev. F 4-59
July 22, 2005
Figure 4.29 Front Panel Removal, Nut Location
5. Remove one nut located behind the HV Pothead (Figure 4.29), using a nut
driver.
6. Remove two screws in the Field Reference Calibration box.
7. Remove the ten self-locking screws that hold the front panel in place using
a #8 Torx screwdriver.
NOTE These screws can be difficult to remove. If any of them binds during
extraction, lubricate its front and the rear surfaces with a drop of
machine oil. Then, use vise grip pliers to remove the binding screws if
necessary. Later, when replacing the front panel, use new screws if
available. These can be obtained from Doble if required.
8. Pull the Front Panel Assembly out only slightly. Then, disconnect the
ribbon cable (W12) that attaches to the I/O Protection Board as well as the
white cable (W11).
9. Pull the Front Panel Assembly straight out and place it face down on the
bench.
The resulting top view of the instrument is as shown in Figure 4.30.
Nut
Screws