Opus-Two IO/H/L Cards

Each card needs positive voltage and a reference ground (negative) connection. These should be made of AWG 16 or AWG 14 stranded wire and substantially connected at both ends.

Positive voltage should be fused for green I/O cards.

Above each set of 8 Red/Green lights is a blue overcurrent indicator. If the card shuts down due to overcurrent, the light above the header responsible for the overcurrent will illuminate. The card will restore operation after a power cycle. Do not power cycle until correcting the cause of the overcurrent.

The I/O Accessory connections (6 pin + 3 pin) are not used.

FAQ:

  1. When playing a note on a chest, all notes on the chest play.
    A chest common/return is either disconnected or connected to the wrong polarity. The LEDs are showing the current returning from individual note wires, not being generated from the card.

  2. When playing large chords or clusters of notes, a red light illuminates in the corner of the I/O card and it cuts out.
    A green IO card is not suitable for Direct Electric chests or any load under 90 ohms. With heavy unification, even loads over 90 ohms can cause overloads. These situations should be solved with red H cards.