APx515 B Series Audio Analyzer: Installation 23
Opening the power entry module
Unplug the power cord from the instrument before chang-
ing fuses or performing any other operations described in
this section.
To open the power entry module, refer to Figure 3 and
proceed as follows:
Figure 3. Power entry module door and fuse
block.
• Remove the mains power supply cord from the
power cord connector.
• Locate the slot in the module cover door hinge. The
hinge is a the left side of the cover door, and the slot
in the hinge is visible in the power cord connector
cavity. Insert a small screwdriver or similar tool in
the slot and pry the cover door hinge outward. The
cover door will snap out, and then can be pivoted on
its hinge for access to the fuse block assembly and
voltage selector card.
Changing the Mains Supply Voltage
Configuration
• Open the Power Entry Module as described above.
• The voltage selector card is a small circuit board fit-
ted with a white plastic indicator pin, installed in a
housing on the right side of the Power Entry Module
as shown in Figure 4. Pull the voltage selector card
straight out of the housing, using narrow pliers to
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