Research Notes

What Is Well Established

RM-M7G has a 41-page service manual available publicly through ManualsLib.
RCP-TX7 has an official Sony 28-page operating manual PDF.
RCP-TX7 has a 22-page service manual locally downloaded as docs/manuals/0a9f4a.pdf.
RCP-TX7 Volume 2 is probably the schematic/circuit volume and appears mostly on paid/manual mirror sites.
Both devices use Sony's 10-pin remote ecosystem through CCA-7 cables.
RCP-TX7 uses a data protocol described as RS-232C-compliant/new protocol. CCU-TX7 and CCU-D50 material point to 38,400 bps for RCP-TX7-class remotes.
DXC-D30 material confirms that PC control is possible only with proper Sony protocol.
CCU-D50 command mode matters: M5A mode is the RM-M7G/basic-control path and TX7 mode is the RCP-TX7/detailed-control path.
The RCP-TX7/CCU-TX7 10-pin remote pinout is now mostly established: serial data on pins 4 and 7, serial/data grounds on pins 5 and 6, DC power on pins 9 and 10, composite video on pins 2 and 3, and spares on pins 1 and 8.

What Is Not Yet Confirmed

Exact Sony command protocol framing, checksums, command table, and session behavior.
Exact RCP-TX7 schematic availability from free public sources.
Whether the RCP-TX7 22-page service manual contains enough board-level detail for the current fault; Volume 2 is still the stronger schematic target.
Exact CCA-7 wire color to pin mapping; extracted wiring diagrams are too degraded to trust without continuity testing.
Whether all CCA-7 cables are fully straight-through for every pin in every system, although related service documentation strongly suggests this cable family is the correct interconnect.
Whether the serial lines are true RS-232 voltage levels on every compatible camera/CCU path or merely RS-232C-framed/protocol-compatible.
Exact differences between RM-M7G and RM-M7GP.
Exact dimensional/weight discrepancy for RCP-TX7 between operating manual and catalog-style references.

Suggested Next Steps

Obtain the RCP-TX7 Volume 2 schematic manual.
Obtain a CCU-D50 service manual if CCU-side board repair becomes relevant.
Verify the normalized 10-pin pinout against the original PDF page images and any physical CCA-7 cable available.
Build a continuity-tested cable map with connector orientation photos and wire colors.
Check whether serial lines are true RS-232 voltage levels or TTL-level serial with RS-232-style framing on any particular device.
Use a passive serial analyzer or high-impedance oscilloscope probes on a known-working camera/remote combination before attempting custom control.
Document observed packets, timing, and state transitions in a future docs/protocol/ folder.

Practical Reverse-Engineering Cautions

The remote connector carries both power and data, so a wiring mistake can damage the remote, camera, or CCU.
Pin 10 is the positive remote power feed and pin 9 is its return in the RCP-TX7/CCU-TX7 pinout. Verify polarity before applying power.
Bench discovery notes have confirmed pin 9 as ground and pin 10 as power on the current cable/panel under test; see Discovery Notes.
Pins 2 and 3 are composite video, not serial data.
Pins 4 and 7 are the serial data pair directions; use high-impedance probing before attaching an adapter.
Sony uses the phrase RS-232C in several documents, but that does not guarantee standard DB-9 pinout, command language, or safe direct wiring to a PC serial port.
Some connected cameras disable local controls while RM-M7G/RCP-TX7 is present. That can look like a fault if the control handoff behavior is not expected.
CCU modes matter. CCU-D50 can operate in M5A mode or TX7 mode, and the wrong mode can make a good panel appear nonfunctional.

Sparse Forum Trail

Searches for exact forum-style discussions around RM-M7G and RCP-TX7 found mostly manual mirrors, reseller listings, and camera/CCU manuals. There does not appear to be a rich public repair-forum trail for these exact units. The best available repair information is in the service manuals and related CCU manuals.

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