After the test is OK, take the phantom jack out, the output is 0dB;
4). Press the LOW CUT key in the tested channel down, use AP to test the frequency
specification, as for the fig1
After the test is OK, release the LOW CUT key;
5). EQ Test:
a. Rotate the HI GAIN knob to min and max to scan the frequency response; rotate the
LOW GAIN knob to min and max, as for fig2;
After the test is OK, rotate the HI GAIN, LOW GAIN knob to midpoint;
b. Rotate the MID-GAIN knob to min, and rotate the MID-FREQ knob to min, mid and
max to scan the frequency response in separately; rotate the MID-GAIN knob to max,
and rotate the MID-FREQ knob to min, mid and max to scan the frequency response,
as for fig3;
After the test is OK, rotate the MID-GAIN, MID-FREQ knob to mid;
6). AUX Output Test:
a. Rotate the AUX1 knob in tested channel to min, the AUX1 has no output;
b. Rotate the AUX1 knob in tested channel to
"
0
", the AUX1 output is 0±2dB;
c. Rotate the AUX1 knob in tested channel to "+10", the AUX1 output is 10±2dB.
After the test is OK, rotate the knob to "0";
d. Push the channel LEVEL to min, the AUX1 has no output;
e. Push the channel LEVEL to "0", the AUX1 output is 0±2dB;
f. Push the channel LEVEL to "+10", the AUX1 output is 10±2dB;
After the test is OK, push the slide key to "0";
g. Press the AUX1 input selector key down, and select the "PRE", the AUX1 output is
0±2dB, push the LEVEL slide key in channel to max, the output has no variation,
release the "PRE" key, push the channel slide potentiometer to "0" to make the AUX1
output is 0dB;
After the test is OK, rotate the AUX1 knob to min
"-∞"
in counterclockwise.
(the same procedure to test the AUX2)
h. Rotate the AUX3 knob in tested channel to min, the AUX3 has no output;
i. Rotate the AUX3 knob in tested channel to "0", the AUX3 output is 0±2dB;
j. Rotate the AUX3 knob in tested channel to "+10", the AUX3 output is 10±2dB.
After the test is OK, rotate the knob to "0";
k. Push the channel LEVEL to min, the AUX1 has no output;
l. Push the channel LEVEL to "0", the AUX1 output is 0±2dB;
m. Push the channel LEVEL to "+10", the AUX1 output is 10±2dB;
After the test is OK, push the slide key to "0", and rotate the knob potentiometer to min
"-
∞"
in counterclockwise.
(the same procedure to test AUX4)
7). PAN Test:
a. Rotate the PAN knob to
"
LEFT
"
, the ST OUT L output is 2±2dB, but the ST OUT R has
