What the thread found

• The box is approximately 30 years old and may have been modified internally.
• To determine the pin assignment, measure continuity with a multimeter and observe what occurs when toggling the 12/24 V switch.
• Originally, a 4-pin hermaphrodite connector was standard; non-standard connectors indicate a later retrofit for Bartech or newer Preston 3/4 systems.
• This particular top-stage junction box may be an early third-party unit designed for the Cinema Products 3A and is not documented in standard handbooks.

Depends on

• Modification history unknown; original configuration cannot be assumed
• Actual pin mapping depends on whether the box retains original wiring or has been retrofitted

Parts

Top Stage

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