Alesis E-DRUM TOTAL, Service Manual

Page: 27 / 35

Diagnosis
23
Press [+] button, the display will show the PCBA version. To go back to the software version, press the [-]
button.
Press the [START/STOP] button to enter the main test menu. The display will show the first test item.
2. Audio
Press the [+]/[-] buttons to select “C01”, then press [START/STOP] to enter this menu. Or press
[CLICK] to exit.
Press the [+]/[-] buttons to select a sub item “440HZ/1KHZ/10KHZ/MUTE”. When an oscilloscope is
connected to the L/R channels, check that it outputs an sine wave of “440
±
5Hz”, “1K
±
5Hz”, “10K
±
20Hz”. When it is muted, use the oscilloscope to check the distortion and amplitude of the output sine
wave in each channel.
Judge if there is any error based on the normal values. Then listen with headphones to check if there is
sound in the PHONES channel.
This image indicates the L channel outputs 440Hz, while the R channel outputs 1KHz.
This image indicates the L channel outputs 1KHz, while the R channel outputs 440Hz.
This image indicates the L and R channels output 10KHz at the same time.