EFFECCT RTN slide potentiometer and AUX1-AUX3 rotate potentiometer to "-
∞
".
9. Amplifier Output Test (RMS Test):
Turn the POWER AMP switch to "ON", input from MIC1: -5dB sine waveform signal, rotate
the GAIN to minimum, push the channel, ST OUT, AUX1 and MONO slide potentiometer
to "+10":
1). Connect a 4
Ω
load resistor in each output terminal
"
1+, 1-
"
of APM L/R, turn the AMP
MODE switch to "MAIN L+MAIN R" and use this mode to output, the left and right AMP
output power is 300W (APM160 is about 500W), THD<1%:
2). Turn the AMP MODE switch to "AUX+MONO" and use this mode to output, push the
MONO OUT and AUX1 slide potentiometer to "+10", the left and right AMP output
power is 300W (APM160 is about 500W), THD<1%.
3). Push the AMP MODE switch to BRIAGE and use this mode to output, connect a 8
Ω
load resistor in output terminal "1+, 2+" of AMP L, the AMP output power is about
550W (APM is about 900), THD<1%.
After the test is OK, push the AMP POWER switch to "OFF"; push the AMP MODE to
"MAIN L+MAIN R" and use this mode to output.
10. Output Noise Test:
No input signals, turn all the MIC GAIN of the channel to minimum, and slide
potentiometer to "0", the oscillograph waveform should be flat and no other noise wave.
11. Gooseneck Lamp Test:
Insert gooseneck lamp to BNC socket of PCB, the lamp will light up and the illumination
will in normal
12. Listening Test:
1). Connect all output terminal of the units to high quality AMP or horn in return and listen
to all the output whether it will have abnormal voice;
2). Press all the keys down and listen to this unit whether it has abnormal voice.
13. Burning Test
Connect the unit to music signal, and the output to false load, three output modes test for
60min.
14. Factory Preset:
1). Push all the PHONES, LPF, and POWER AMP slide switch to "OFF";
2). Rotate the entire GAIN knob to minimum;
3). Rotate all the EQ GAIN, EQ FREQ, PAN and BAL potentiometer to midpoint;
4). Turn the 9-band EQ slide potentiometer to midpoint, and turn all the slide potentiometer
to maximum.
