Digital And Midi Test - Alesis DEQ830 Service Manual

Rear Panel Sub Assembly Test – DIGITAL CON'T

Digital and MIDI Test

1) Press the UTILITY and CHANNEL 7 buttons on the Known Good ME4 Front
Panel Sub-Assembly and hold these buttons during Step 2. When started
in this manner, the unit will enter Factory Test Mode.
Section 1b on the Diagnostic Mode.
2) Plug the IEC Power Cable into a power source and BB01.
Verify that the front panel LEDs show normal power up message,
"DEQ830" on the left side..
After this message "DIAG: <version>" should display on the left
side.
number for the ME4.
Problems with this inspection indicates that the unit has not
entered Factory Test Mode.
and 2.
Problems with the correct version number indicate that the
Known Good ME4 Front Panel has the incorrect software in it,
and that it should be updated to the most recent software.
Failure of this test indicates that this sub-assembly cannot
continue further testing.
3) When in Factory Test Mode, pressing PROGRAM will go to next test.
Press PROGRAM.
Verify that the front panel LEDs shows first test message
"EEPROM" for 1 second.
Verify that the front panel LEDs shows first test message
"EEPROM PASS".
Problems with this inspection indicates that the unit is having
trouble recognizing the PROGRAM button, or that the EEPROM has
failed.
Failure of this test indicates that there is something wrong
with the ME4 Known Good Front Panel.
4) Press PROGRAM until unit displays "MIDI."
Verify that the front panel LEDs shows test messages:
EEPROM -> COL -> ROW -> ALL -> SWITCH
STOP here.
Verify that the version is the correct, shipping version
Unplug the unit and repeat steps 1
Please Note