Alesis DM8, Service Manual, Page: 7 / 49

DM8 MP DIAGNOSTIC TEST PROCEDURE
Aux In to Headphone Outputs
a) Turn the Main level to minimum, and connect the Headphone output to the AP analyzer inputs. Set the AP
analyzer input impedance to 600 Ohms.
b) Connect the AP generator output to the AUX IN 1/8” TRS jack. Set the AP output to 2Vpp (-0.8dBu),
1KHz. Verify that the headphone left and right output levels are approximately between (14dBu to 16.8dBu).
THD+N should be less than 0.010% (22-22KHz BW).
c) Turn off the signal to Aux right input and verify that only the Headphone left output has a signal. Turn on
the signal to Aux right input.
d) Turn off the signal to Aux left input and verify that only the Headphone right output has a tone.
e) Turn off the signal to both the Aux left and right input and verify that the SNR for both Headphone left and
right outputs is at least 90dB, 95dB A-weighted (22-22KHz BW).
11. Flash Test
Diags
Flash
a) Press [PLAY] to begin the test. It will take about 15 seconds to complete. During this time, the LCD will
display the various stages of the test:
FLASH
Write..
FLASH
100%
FLASH
RW PASS
FLASH
CRC
b) If everything passes, the LCD displays the following:
FLASH
Passed
12. Serial EEPROM Test
Diags
EEPROM
a) Press [PLAY] to run the test. Note that the test is very short, so it may seem like the unit is not doing
anything. The LCD will display either a pass or fail almost immediately after pressing the [PLAY] button.