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Interlocking Post
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Figure 4-1. Power Supply Interlocking Post
3 If the interlocking post is not broken, reinstall the power supply; follow
Steps 5-8 in “Replacing the Power Supply” Iater in this chapter.
Replacing the Ring Generator
If tip/ring devices (such as single-line telephones, fax machines, and
answering machines) do not ring, and an older 012 module is installed, try the
procedure below.
4-4 Control Unit Problems