80 lines
4.1 KiB
Markdown
80 lines
4.1 KiB
Markdown
# Research Notes
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## What Is Well Established
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- RM-M7G has a 41-page service manual available publicly through ManualsLib.
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- RCP-TX7 has an official Sony 28-page operating manual PDF.
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- RCP-TX7 has a 22-page service manual locally downloaded as
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[docs/manuals/0a9f4a.pdf](manuals/0a9f4a.pdf).
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- RCP-TX7 Volume 2 is probably the schematic/circuit volume and appears mostly
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on paid/manual mirror sites.
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- Both devices use Sony's 10-pin remote ecosystem through CCA-7 cables.
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- RCP-TX7 uses a data protocol described as RS-232C-compliant/new protocol.
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CCU-TX7 and CCU-D50 material point to 38,400 bps for RCP-TX7-class remotes.
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- DXC-D30 material confirms that PC control is possible only with proper Sony
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protocol.
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- CCU-D50 command mode matters: `M5A mode` is the RM-M7G/basic-control path and
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`TX7 mode` is the RCP-TX7/detailed-control path.
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- The RCP-TX7/CCU-TX7 10-pin remote pinout is now mostly established:
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serial data on pins 4 and 7, serial/data grounds on pins 5 and 6, DC power on
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pins 9 and 10, composite video on pins 2 and 3, and spares on pins 1 and 8.
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## What Is Not Yet Confirmed
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- Exact Sony command protocol framing, checksums, command table, and session
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behavior.
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- Exact RCP-TX7 schematic availability from free public sources.
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- Whether the RCP-TX7 22-page service manual contains enough board-level detail
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for the current fault; Volume 2 is still the stronger schematic target.
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- Exact CCA-7 wire color to pin mapping; extracted wiring diagrams are too
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degraded to trust without continuity testing.
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- Whether all CCA-7 cables are fully straight-through for every pin in every
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system, although related service documentation strongly suggests this cable
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family is the correct interconnect.
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- Whether the serial lines are true RS-232 voltage levels on every compatible
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camera/CCU path or merely RS-232C-framed/protocol-compatible.
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- Exact differences between RM-M7G and RM-M7GP.
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- Exact dimensional/weight discrepancy for RCP-TX7 between operating manual and
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catalog-style references.
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## Suggested Next Steps
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1. Obtain the RCP-TX7 Volume 2 schematic manual.
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2. Obtain a CCU-D50 service manual if CCU-side board repair becomes relevant.
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3. Verify the normalized 10-pin pinout against the original PDF page images and
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any physical CCA-7 cable available.
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4. Build a continuity-tested cable map with connector orientation photos and
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wire colors.
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5. Check whether serial lines are true RS-232 voltage levels or TTL-level serial
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with RS-232-style framing on any particular device.
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6. Use a passive serial analyzer or high-impedance oscilloscope probes on a
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known-working camera/remote combination before attempting custom control.
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7. Document observed packets, timing, and state transitions in a future
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`docs/protocol/` folder.
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## Practical Reverse-Engineering Cautions
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- The remote connector carries both power and data, so a wiring mistake can
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damage the remote, camera, or CCU.
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- Pin 10 is the positive remote power feed and pin 9 is its return in the
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RCP-TX7/CCU-TX7 pinout. Verify polarity before applying power.
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- Bench discovery notes have confirmed pin 9 as ground and pin 10 as power on
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the current cable/panel under test; see [Discovery Notes](discovery-notes.md).
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- Pins 2 and 3 are composite video, not serial data.
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- Pins 4 and 7 are the serial data pair directions; use high-impedance probing
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before attaching an adapter.
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- Sony uses the phrase RS-232C in several documents, but that does not guarantee
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standard DB-9 pinout, command language, or safe direct wiring to a PC serial
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port.
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- Some connected cameras disable local controls while RM-M7G/RCP-TX7 is present.
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That can look like a fault if the control handoff behavior is not expected.
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- CCU modes matter. CCU-D50 can operate in M5A mode or TX7 mode, and the wrong
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mode can make a good panel appear nonfunctional.
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## Sparse Forum Trail
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Searches for exact forum-style discussions around `RM-M7G` and `RCP-TX7` found
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mostly manual mirrors, reseller listings, and camera/CCU manuals. There does not
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appear to be a rich public repair-forum trail for these exact units. The best
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available repair information is in the service manuals and related CCU manuals.
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