Front Panel; Back Panel - US Blaster USB 7137 Owner's Manual

USB 7137 - 7138
Professional Power amplifier

FRONT PANEL

1. Power channel
To turn the unit ON or OFF, press the Left or Right part of this button. Before turning on the amplifier, check all
connections and turn down the level controls. A momentary muting is normal when turning the amplifier on or
off. (Caution: Always turn on your power amplifier last, after all your other connected equipment, and always
turn off your power amplifier before your other connected equipment.)
2. Power LED indicators
These LEDs illuminate when the power is turned "ON".
3. Limit LED indicators
These LEDs illuminate if any section of the power amplifier's output are within 3dB of clipping. Occasional blin-
king of the LEDs are acceptable, but if they remain on more than intermittently you should turn down either
the power amplifier's level controls or reduce the output level of the preceding component to avoid audible
distortion.
4. Signal LED indicators
These LEOs illuminate to confirm the presence of an input signal greater than 100 mV at that channel of the
amplifier
5. Signal LED indicators
These LEDs illuminate if the power amplifier's output connection is shorted or the load impedance is too low.
When either of these LEDs is lit, turn OFF the power and check the output's connection to verify that it is cor-
rect, then turn ON the power again.
6. Level controls
These control the level of signal coming into each channel. The actual voltage gain of the amplifier is shown
in dB. Turn these controls counterclockwise if the peak LEDs illuminate steadily (indicating too strong an input
signal).

BACK PANEL

7. Power connector
The cord connector is used to connect the AC power source to your power amplifier.
(CAUTION: D0 NOT REMOVE THE CENTER GROUNDING PIN.)
8. Fuses
Fuse holders for T2A-6.3A/250V fuses. If these fuses continuously blow, shut off the unit and have it serviced
by qualified service personnel.
9. AC Voltage selector switch
Before plugging in the power cord, check to see that the unit is set for the proper voltage for your area:-
115V(60Hz)or -230V(50Hz).
10. Input connectors
Connect your input signal to these unbalanced 6.3 mm TRS input jacks.
11. L/R Channel output connectors
Connect to your speaker box.
12. L/R Channel output connectors
The fan speed is varied continuously and automatically to maintain the proper internal operating temperature.
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