[sdiy] Alesis MIDIVerb IV service notes?

[Carsten Tönsmann]

Are these units built up with the AL1101 - AL3201B - AL1201 chipset? If so, 
read on.

I made a Single Chip Delay module for my Formant Modular using this chipset. 
No MIDI control, but if your strange behaving module is built around the 
chipset mentioned abve the signal path should be similar. I would check the 
following things:

1.) Are there any audio signals (no noise) at pin 1 and 2 (and 15 and 16) of 
the AL1101 ADC (stereo)

2.) Is there a sync pulse from the AL3201B DSP pin 9 to AL1101 ADC pin 9 and 
AL1201 pin 9? This pulse synchronizes the converter chips and makes the ADC 
providing a bit stream from a stereo sample and the DAC converting a bit 
stream into 2 audio values (stereo)

3.) Is there a bit stream between the AL1101 pin 10 and the AL3201B pin 16? 
(input)

4.) Is there a bit stream between the AL3201B pin 1 and the AL1201 pin 7? 
(output)

5.) Are there any audio signals (no noise) at the pins 1, 2, 15 and 16?

See also module description:
http://www.analog-monster.de/scr_en.html
and schematic
http://www.analog-monster.de/SingleChipReverb.jpg

Cheers,

Carsten
Analog Monster
http://www.analog-monster.de/index_en.html

----- Original Message ----- 
From: "Nathan M. Reeves" <djservs at comcast.net>
To: "synth diy" <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, May 07, 2009 4:54 PM
Subject: [sdiy] Alesis MIDIVerb IV service notes?


> Anyone have these available or know of any known issues with these  units?
>
> I am thinking its an ADA problem but will reinitialize it to see if  that 
> does anything....(yeah right)
>
> I have a customer whose units turns on fine but just gets noise  through 
> no effects...
>
> Cheers,
>
> Nate
>
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