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Alesis MidiVerb 3 Service Manual

Alesis MidiVerb 3
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6.0 UPDATES AND CORRECTIONS
6.1 CABLES
Check all connector cables are firmly seated. In some cases, they can come 1/2 way off.
6.2 U17
If U17 (74HC139) is a type made by National semiconductor, it should be replaced with a type
made by TI. Problems with this device range from distorted audio, to no display, or a complete
system lockup.
6.3 RESET
The original design for the MidiVerb III called for a simple reset circuit cosisting simply of a
resistor and a capacitor. Shortly after the release of the product, it was found that this simply wasn't
enough (if the unit was turned off, and then turned back on rapidly, the unit would occasionally fail to
reset). The circuit was redesigned to provide a more stable reset signal (see section 4.2). At this
point, a small PC board was created to take the place of the orginal. These will be found screwed
down to the regualtor heat sink (it makes for a convinient ground). Later, the circuit was incorporated
into the main PC Board. We believe that most, if not all of the original boards that went out have
been retrofitted, so their occurance in field should be extremely rare.
6.4 Power Choke
Two items regarding the R.F. chokes in the power supply. Some chokes were found to have
broken loose during shipping. These should be affixed to the main PCB (we recomend using hot
glue). It is also possible for the choke to short to the case top (which is grounded). A small piece of
electrical tape on the case top, above the choke, or hot glue applied in a thin layer to the top of the
choke should alleviate this situation.
7.0 HELPFUL HINTS & COMMON PROBLEMS
Troubleshooting a complex device, such as the M3, can range from the simplicity of looking,
seeing, and reseating a loose cable, to examining complex timing relationships of data and control,
and replacing the "slightly" bad latch. The chart on the following page was created in an effort to
relieve the beleaguered technician from having to "discover" some of the common faults we have
seen. Please note that we only cover the most likely causes, not all of them.

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Alesis MidiVerb 3 Specifications

General IconGeneral
TypeDigital Effects Processor
EffectsReverb, Delay, Chorus, Flange, EQ
MIDIIn, Out/Thru
Frequency Response20 Hz - 20 kHz
A/D Resolution16-bit
D/A Resolution16-bit
Bit Depth16-bit
Power Supply9V AC
Dimensions1.75"
Inputs2 x 1/4" TRS
Outputs2 x 1/4" TRS

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