Most likely the camera is being blocked by the film-back dark-slide interlock, not necessarily indicating a fault. On the RZ67, the body is designed to prevent firing when the back signals that the dark slide is in place. Without a compatible RZ back attached, that interlock may still stop the release.

So, no: the body may not complete its normal fire cycle just by being cocked and having a battery installed. The orange light behavior you describe is consistent with the interlock preventing release.

Best next steps:

• Test it with a proper RZ67 film back attached.
• Check the camera manual for the interlock/contact arrangement.
• Only if you know exactly what you’re doing, the relevant contacts can be temporarily shorted to simulate the back state, but this is not recommended unless you’re comfortable doing so.

An RB back won’t confirm proper RZ operation, since the systems are not interchangeable in the way needed for this test.