20261015-1500-air-hub-schematic-fixes Record the Air Hub input TVS, long-press reset, CAN and LED fixes in the documents

• status: completed
• priority: P1
• owner: worker/session-20261015-1500
• createdAt: 2026-10-15 15:00

Description

A review of the handover package against the EasyEDA notes found five schematic faults that are present on both the Linux carrier and the Mini, and the owner asked to fix them in the hardware workspace /srv/ybo/switch/ and to update the documents ("你来改，docs也修改一下"):

1. Input TVS 5.0SMDJ33A is unidirectional with its cathode on GND_IN: it conducts forward at normal polarity and blows F1. It becomes the bidirectional 5.0SMDJ33CA, which also keeps a reversed input from blowing the fuse ahead of the reverse-polarity FET.
2. The long-press reset capacitor (4.7 µF) went from LPR_RC to GND, so every power-up held the reset input low for about 3 s. It now goes from LPR_RC to +3.3 V.
3. CAN_ERR_N pull-up 10 kΩ → 100 kΩ.
4. CAN ESD NUP2105L (24 V) → NUP3105L (32 V), as on the Key boards.
5. Blue LED series resistors 1 kΩ → 330 Ω.

Acceptance criteria:

1. Reference-board page §4, §5, §7 and §8, the guide §8 and the spec's AIR-O-04 name the new parts and circuit; the 36 V TVS stand-off item stays open for the hardware owner.
2. The handover package docs are refreshed from this repository.
3. Quality gate passes: bun run docs:lint && bun run docs:build && git diff --check.

ActiveForm

Recording the Air Hub schematic fixes in the documents

Dependencies

• blocked by: (none)
• blocks: (none)

Notes

No separate plan: the change list above is the plan.