74 lines
3.5 KiB
Markdown
74 lines
3.5 KiB
Markdown
# Discovery Notes
|
|
|
|
This file records hands-on observations separately from manual-derived facts.
|
|
Treat these as bench notes: useful and current, but still worth rechecking with
|
|
photos, continuity tests, and instrument captures.
|
|
|
|
## 2026-05-13 - RCP-TX7 10-Pin Power and Cable
|
|
|
|
Observed on the RCP-TX7 10-pin remote connector/cable during restoration work:
|
|
|
|
- Pin 9 confirmed as ground / DC return.
|
|
- Pin 10 confirmed as power input.
|
|
- Cable color for pin 9 / ground: brown.
|
|
- Cable color for pin 10 / +12 V power: brown-white.
|
|
- Cable colors for pins 1-8 have been continuity-mapped; see the working cable
|
|
map below.
|
|
- Yellow and yellow-white conductors are present in the cable but did not map to
|
|
connector pins during continuity testing.
|
|
- With power present on pins 9 and 10, the panel shows a green `PANEL ACTIVE`
|
|
light.
|
|
- The inside of the 10-pin cable contains 12 wires total.
|
|
- Three of those wire groups are twisted pairs.
|
|
|
|
Immediate implications:
|
|
|
|
- The bench result agrees with the RCP-TX7 and CCU-TX7 manual pinout for pins 9
|
|
and 10.
|
|
- The 12-conductor cable construction suggests not every conductor maps
|
|
one-to-one to the 10 connector pins; shielding/drain, duplicated grounds, or
|
|
paired signal returns may be present.
|
|
- The three twisted pairs are likely important candidates for serial data,
|
|
composite video, and/or power/ground pairing, but this should be confirmed by
|
|
continuity testing rather than color or twist assumptions.
|
|
|
|
### Working Cable Map
|
|
|
|
This table combines the manual-derived pin purpose with hands-on color mapping.
|
|
Rows marked `confirmed` have been checked on the current cable/panel under test.
|
|
|
|
| Pin | Purpose | Cable color | Status | Notes |
|
|
| ---: | --- | --- | --- | --- |
|
|
| 1 | Spare / unused | red | confirmed | No function shown in service manual. |
|
|
| 2 | VBS / composite video X | black | confirmed | 1.0 Vp-p composite video input to RCP. |
|
|
| 3 | VBS / composite video ground | green | confirmed | Video reference/ground. |
|
|
| 4 | Serial data, RCP to CCU/camera | orange | confirmed | RS-232C-based data direction. |
|
|
| 5 | Serial/data ground | blue | confirmed | One of two serial/data grounds. |
|
|
| 6 | Serial/data ground | grey | confirmed | One of two serial/data grounds. |
|
|
| 7 | Serial data, CCU/camera to RCP | purple | confirmed | RS-232C-based data direction. |
|
|
| 8 | Spare / unused | purple-white | confirmed | No function shown in service manual. |
|
|
| 9 | DC return / ground | brown | confirmed | Confirmed as ground on current cable. |
|
|
| 10 | +12 V remote power input | brown-white | confirmed | Confirmed as power input on current cable. |
|
|
|
|
### Unmapped Cable Conductors
|
|
|
|
The cable contains two additional conductors that did not show continuity to
|
|
the 10 connector pins during the current test:
|
|
|
|
| Conductor color | Current status | Notes |
|
|
| --- | --- | --- |
|
|
| yellow | unmapped | May be shield/drain-related, spare, broken, or connected only at one end. |
|
|
| yellow-white | unmapped | May be shield/drain-related, spare, broken, or connected only at one end. |
|
|
|
|
Recheck these against connector shells, shield braid/drain, cable strain relief
|
|
hardware, and both ends of the cable if accessible.
|
|
|
|
Suggested next observations to capture:
|
|
|
|
1. Connector orientation photo showing pin numbering reference.
|
|
2. Wire color list, including which colors form each twisted pair.
|
|
3. Confirm whether yellow and yellow-white connect to shield, shell, or one end
|
|
only.
|
|
4. Resistance between pins 5, 6, and 9 with the cable disconnected.
|
|
5. Scope/meter idle voltage on pins 4 and 7 relative to pins 5/6 and pin 9.
|