SI-125 Power Amplifier Manual 7
Optional Modules
Additional functionality can be added to the SI-125 Power Amplifier with the factory installation
of one of the following optional modules.
Note: These modules must be ordered at the same time as the SI-125 Amplifier as they cannot be
installed in the field at a later time. These modules are installed on the rear of the amplifier by the
Telecor factory and therefore cannot be ordered independently without an amplifier.
The PA-AM Power Amplifier Attenuator Modules provides the amplifier with the ability to
support a 25 V input signal which is attenuated by -25, -45, or -70 dB. Refer to the PA-AM
Power Amplifier Attenuator Module Manual for more information.
The PA-MM Power Amplifier Monitor Module will monitor the operational status of the
amplifier. As long as the amplifier is operating normally, a relay will be activated. Refer to the
PA-MM Power Amplifier Monitor Module Manual for more information.
The PA-PM Power Amplifier Paging Module adds three additional input options to the
amplifier: one low impedance microphone and two balanced line level inputs. The three inputs
have adjustable level and remote mute controls. The three inputs can also be assigned to one of
three available priority levels. Refer to the PA-PM Power Amplifier Paging Module Installation
Guide for more information.
Troubleshooting
Problem Description
VU Meter registers a signal when
no signal should be present.
The amplifier may be oscillating, possibly at a very high frequency.
This may be caused by: running input and output wires close
together, grounding the input, or incorrect grounding of the shield.
The Current Overload light
illuminates or flashes.
This indicates that the amplifier is being overloaded. Check the
total speaker load on the amplifier. Also check for shorts in the output
wiring and for shorts to ground. If the amplifier is being overloaded,
reducing the load or the gain should solve the problem.
The Clip light illuminates or
flashes. The input level to the amplifier is too great. Correct either by
turning down the GAIN Control or by reducing the Input Level at the
source of the amplifier’s audio signal.
The High Temperature light
illuminates.
This indicates an excessively high temperature on the heat sinks.
When this occurs, the output level is reduced until the temperature
returns to normal. Overheating of the heat sinks is usually caused by
insufficient ventilation or operating the amplifier in an overload state
for an extended period of time. Check the loading and ventilation of
the amplifier.
Fuse blows. This indicates excessive current draw by the amplifier. To replace
the fuse, turn the amplifier Power Switch OFF and unplug the
amplifier from the AC receptacle. Unscrew the fuse knob and replace
the fuse with the same type, voltage and current rating as indicated
on the amplifier and below:
SI-125 amplifier uses a 3AG 250V 3.5A fuse.
If the new fuse also blows, unplug the amplifier and contact Telecor
Technical Support.
