Inter-M PAM-520 - Manual (Page 8)

5 PAM-510/520
ATT. ZONE AMPLIFIER
6. SIREN
This is for emergency situation. Depending upon the volume adjustment the level of signal and mute level are
varied.
(~) : Alert siren curve. (repeat)
(–) : Alert siren flat. (continuously)
7. TEL IN
Depending upon the volume adjustment the level of signal and mute level are varied.
8. RINGER
Night ringer function let you hear telephone ring via speaker.
Depending upon the volume adjustment the level of signal and Mute level are varied.
9. MASTER VOLUME
This rotary switch controls the overall output volume of the amplifier’s output signal.
10. POWER SWITCH
Pressing this switch turns the unit on, as indicated by the Power LED above the switch. Pressing it again turns
the unit off. When the switch is to off location, becomes the stand-by condition and the STAND-BY LED lights.
11. PROTECTION INDICATOR
This LED indicates the state of the amplifier’s protection circuitry. When the Protection LED is on (illuminated),
the protection circuitry is active, indicating that the unit is not operating normally. This is typically due to
overheating or power limiting. Please check the Input and Output condition of the amplifier.
12. OUTPUT LEVEL INDICATOR
These three LEDs indicate the amplifier’s output status. The -40dB LED indicates the presence of audio signal
at the amplifier’s output. The -10dB LED indicates output at nominal operating range. The red CLIP LED
indicates an excessive output level. Do not operate the unit with the CLIP LED continuously on (illuminated).