Accesss Virus KB

Following up on the success of the popular Virus, Access unleashed an upgraded model in 1999, the Virus B. The original Virus A had 12-voice polyphony, but the new OS in the Virus B doubles the polyphony from 12- to 24-voices and the oscillators, from 2 to 3 per voice. The new OS also added an enhanced programmable 32-band vocoder. There are now up to 82 simultaneous effects, a retro-phaser (6-stage stereo phaser with 24 filter-poles), chorus/flanger, ring modulator, multiple forms of distortion, an analog boost algorithm, and an envelope follower. Up to five FM (Frequency Modulation) modes are also on-board now and many new sounds have been created for this bigger and better version of the Virus.

Symptom or Problem Encountered
The synthesizer will not power on. Sometimes there will be lights on the LFO knobs. The display will be dim with no information.

Causes

 * Normally the brown 100uf 25v capacitor has failed

Solutions

 * Replace the brown 100uf 25v capacitor.

Disassembly Notes
The Knobs do not need to be removed to disassemble.

Main Board
If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

 * Digikey BOM: https://www.digikey.com/

Related Links

 * Videos or other things that might be helpful to check out