Powering And Surge Protection - Motorola STARLINE SERIES Installation And Operation Manual

3-18 Amplifier Setup
13
Verify that the pad and equalizer values are similar to the map design values.
You can verify proper return alignment by injecting a carrier, at the design level, into any
amplifier at random. Proper alignment is achieved if you observe the reference level at the
headend optical receiver output.
Return levels used for alignment are not necessarily operational system levels. These levels
vary from system to system due to differences in equipment, architectures and design
philosophies. For an in-depth analysis and discussion of the return path, refer to Motorola
reference guide Return Path Level Selection, Setup and Alignment Procedure.

Powering and Surge Protection

In conventional applications, MB*/*s are powered through the input port.
CAUTION!
To avoid damage to the hybrids, it is recommended that you remove the input pad (JXP-IN) before you apply power to
the MB*/*.
A 20-ampere, blade-type fuse is furnished in the three active ports of the dual output amplifier
module and provides overcurrent protection for ac power applied to the input. You can power
the MB*/* from the output without passing power through to the input port. To block power
from the input port, remove the 20-amp fuse (F1) located in the input port as illustrated in
Figure 2-11.
WARNING!
To avoid possible injury to personnel or damage to the equipment, remove 60/90 volt ac power from the system
before you remove any components from the housing.
The MB*/* is shipped from the factory configured for 38 through 90 Vac powering as described
in Section 2, " Overview" . To configure the MB*/* for 55 Vac through 90 Vac operation:
Remove the power-supply cover.
1
Move the / selector (jumper J1 on the power-supply board) from the
2
LO HI
Figure 2-10 illustrates the jumper location.
Re-install the power-supply cover and torque the screws to 10 to 12 in-lbs.
3
Standard surge protection is provided in the power supply by a heavy-duty, 230-volt, gas
discharge surge protector. As an option, you can replace the gas discharge tube with the FTEC.
The FTEC has a firing potential of approximately 245 volts.
To install the FTEC:
Remove the power-supply cover.
1
Remove the gas-tube surge protector, illustrated in Figure 2-10.
2
Replace it with the FTEC.
3
Re-install the power-supply cover and torque the screws to 10 to 12 in-lbs.
4
MB*/* Installation and Operation Manual
to position.
LO HI