The following diagram follows the path of the Scanning Interface Unit (SIU) v2.2 horizontal blank and vertical blank relay circuits.

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Notes:

• Scanning Interface Rev 2.2 is printed on the card inside the SIU.
• SEII Rear Panel Connector is that of the computer card.
• Scanning I/O B is an SIU rear panel connector.
• The circuit shown is inside the SIU.
• See the 2.2 relay enable circuit for the origin of RELAY_EN. Contact support for more information.