User guide

M4000 Insulation Analyzer User Guide
72A-1230 Rev. F 4-83
July 22, 2005
Replacing the I/O Protection Board
Note the location of the I/O Protection Board in Figure 4.30 on page 4-60.
Take the following steps to replace it:
1. If it has not already been done, remove the Front Panel Assembly. See
Steps 1-8, ”Removing and Replacing the Front Panel Assembly”
on page 4-58. Place the Front Panel Assembly face down on the bench.
NOTE Do not remove the replacement board from its anti-static bag until
instructed to do so. See the Note on page 4-48 for additional ESD
precautions.
2. Remove six screws (Figure 4.43) that attach the I/O Protection Board to
the Front Panel Assembly using a Phillips-head screwdriver. Note that one
of the screws also secures a black and white grounding wire.
Figure 4.43 I/O Protection Board, Screw Locations
3. Release one W21 and two W24 ribbon cables. Since these last two cables
are both labeled “W24”, note their connection points so that they can be
correctly re-connected once the board has been replaced.
4. Release connections to four cables (W22, W23, W25 and W26).
Secure Screws