9
Connections and wiring
WARNING
The following information is intended for qualified service personnel. Do not make
matrix module connections unless qualified to do so.
To prevent electric shock that could result in serious injury or death, adhere to following
safety precautions:
• Before removing or installing a matrix module in the mainframe, make sure the mainframe is
turned off and disconnected from line power.
• Before making or breaking connections, make sure power is removed from all external
circuitry.
• Do not connect signals that may exceed the maximum specifications of the Model 7709 or
external wiring. Specifications for the Model 7709 are provided at the end of this section.
WARNING
A connector cover must be installed on unused connectors. This includes unused con-
nectors on the Model 7709s and unused row daisy-chain cable connectors. Use two #4-40
screws and nuts to secure a connector cover to a cable connector.
