Alesis MIDIVERB IV, Service Manual

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Alesis MidiVerb IV Service Manual‘ 7 03/05/99
7.00 Test Procedures
If possible, user data should be saved (an Alesis DataDisk is recommended for this task)
prior to any servicing. This, of course, may not always be possible (i.e. dead power supply, bad
reset signal, corrupt data, etc.). Saving user data may also be accomplished after unit
functionality is restored (i.e. power supply, or reset line, is repaired), and prior to further
servicing, and testing. The unit should always be reinitialized (power unit up while holding
"PROGRAM" and "D" buttons down) after changing the EPROM, or SRAM.
7.10 Self Test
The built in test software, as in other Alesis products, provides basic diagnostics and
tests to ensure unit functionality. A MIDI cable MUST be inserted between MIDI IN and OUT
before initiating the test. To initiate the self test hold "A" and "D" while powering the unit up. The
unit will then proceed to test the following:
A
LEDs-All front panel LEDs are lit sequentially and immediately proceeds to the next test.
A
ROM-CHECKSUM-Checks the ROM’s checksum for accuracy and immediately proceeds to
the next test.
A
MIDI TEST-Checks MIDI I/O and immediately proceeds to the next test.
A
RAM TEST-Checks internal memory for correct operation and immediately proceeds to the
next test.
A
SWITCHES/ENCODER-Pressing Individual front panel buttons causes their function to be
displayed on the LCD. Rotating the DATA KNOB causes it’s direction to be displayed. Power
the unit down to exit the self test routines.
7.20 Further Testing.
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Use a clean audio source (CDs preferred) and set up the unit according to the user’s
manual.
/
Listen to the wet (effects) output for any distortion.
/
Use the Data Knob to change the input and output levels through their full range to ensure
the correct operation of the DigPots.
/
To ensure that the shaft encoder is functioning properly all programs should be listened to
briefly.
/
Turn the input level all the way down, and the output level all the up.
/
Listen for excessive noise in the noise floor.
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Send and receive all user programs via MIDI to ensure MIDI operation.
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As a final check it’s a good idea to physically shake the unit so that no loose parts remain
inside the unit.