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The Cassini 16 Infrastructure's Testhead uses a single control board to provide Fixture Power, CBits, RIFL control to smart carriers, testhead fans, air switch, the latch and lock lights, and other electronics in the testhead.



These instructions detail how to remove the access panel and replace the Y000A2B1 board located in the middle of the testhead. Contact Support ([email protected]) for specific instructions for diagnosing or replacing malfunctioning items.

Replacement Hardware provided by RI:

Fixture Power and CBit Testhead Control board - Y000A2B1 (factory programmed/verified)

Front Back

Additional Tools Needed: #1 Philips Screwdriver

Electrical Shock Hazards
There are NO electrical shock hazards from any of the exposed electrical connections on the test head or on any surface of the system. The system uses 48 volts or less and shock hazards are typically designated as to 50 volts or higher. No high-voltage cables or connections are exposed at any time during operations or when moving the system. Fixtures and Tester Instrument Modules (TIMs) can be safely removed "hot" without disconnecting power without damaging the equipment or exposing live connections to the operator. The system is equipped with an Emergency Off (EMO) button that instantly disables all 48 volt connections.
The System Controller MUST ALWAYS be properly powered down BEFORE switching off any breakers. The "Main Breaker" is used to disconnect all electrical connections and can be switched "Off" before performing any infrastructure maintenance that requires tools to remove protective metal covers. The side breakers labeled "TIM Front", "TIM Rear", "Head" or "Mainframe" can be switched "Off" before opening specific service panels.


Fixture Power and CBit Testhead Control board Removal
  1. IMPORTANT: POWER DOWN THE SYSTEM CONTROLLER AND REMOVE ALL TIMS BEFORE DISASSEMBLING THE TESTHEAD!
  2. Rotate the top of the Testhead away (as pictured). Diagram A shows the 16 screw locations needed to remove the access panels for either the Testhead or Front panel, 3 on the back, 12 on the top, and 3 on the front.
    Diagram A
  3. Locate the Y000A2x1 board in the middle of the testhead and unscrew 6 screws (Image B yellow arrows) leaving the 12 headers connected.
  4. Carefully tilt the old board away and replace it with the new board, tightening all 6 screws.
  5. One at a time, move each of the header connections from the old board to the new board (Image B green markers), using caution to not misalign the pins or connect to the wrong location.
    Image B
  6. Attach Testhead access panel and tighten all 18 screws (Diagram A). Install all the TIMS and power on the tester.
    Note: at the time of this writing, no built-in diagnostics can be used to verify the functionality of the replaced board.

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