Alto APM80.1000 Service Manual page 26

The error of the above test is+/-3dBu, the LEFT and RIGHT all need to be tested.
5: MONITOR 9-BAND EQ TEST:
Keep the constant input condition, plug the AP input wire to the MONITOR OUT, then
adjust the LEVEL and make The MONITOR OUT is equal to 0dBu.
1. When all the sliders are turned to the midpoints, the curve is as shown in the following
figure 1.
2. When the sliders of 50, 250, 1K, 5k and 16K are turned to the bottom, and 100, 500, 2K5,
8K to the top, the curve is as shown in the following figure 2.
3. When the sliders of 50, 250, 1K, 5K and 16K are turned to the bottom, and 100, 500, 2K5,
8K to the top, the curve is as shown in the following figure 3.
The error of the above test is +/-3dBu.
6. EQ LEDs Test
Push down the FEEDBACK switch, adjust all the EQ sliders of the MAIN and MONITOR to
the center position, change the output to -20dBu and other conditions keep constant, at that
time, the LED of 1K turns on. Press F9 for scanning, the LEDs from 16K to 50Hz of the
MAIN and MONITOR turn on gradually. Spring the FEEDBACK switch, all the LEDs turn out.
7. FOOT SW, DSP MUTE Test:
Plug the FOOT switch and operate, DSP MUTE lights should turn on and turn down
gradually. Operate DSP MUTE switches, DSP MUTE lights should turn on and turn off
gradually.
8. AMP80.1000&APM80.1500 Test of Amplifier section
The AP setting is as follows:
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