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docs: correct Test button note - S1/J16 likely same signal, not factory-only#103

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docs/correct-test-button-note
Jul 21, 2026
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docs: correct Test button note - S1/J16 likely same signal, not factory-only#103
andy778 merged 1 commit into
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docs/correct-test-button-note

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@andy778 andy778 commented Jul 21, 2026

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Summary

  • A closer photo shows S1 (onboard "Test" pushbutton) sits directly adjacent to J16, a 2-pin screw terminal silkscreened "Test btn" — not a 4-pin header as previously written.
  • Retracts the earlier "most likely a factory test-jig interface, not a field service feature" conclusion: the adjacency strongly suggests S1 is wired in parallel with J16 as an onboard equivalent of the customer's external green Test button. The "TEST 464 PASSED" sticker (previously cited as supporting evidence) is just an unrelated QC-pass label.
  • Firmware only ever found one button-hold flag (DAT_014a), consistent with one logical button rather than two independent inputs.
  • Not proven — flagged as needing a continuity check between S1's pads and J16's terminals to confirm same-net.
  • Also fixed: display is 4-digit, not 3-digit.

Test plan

  • Cross-checked against the photo (pin count, adjacency)
  • Cross-checked against docs/ghidra/codes.md's existing firmware trace (single flag, not two)
  • Docs-only change, no build

🤖 Generated with Claude Code

…ry-only

A closer photo shows S1 (onboard "Test" pushbutton) sits directly
adjacent to J16, a 2-pin screw terminal silkscreened "Test btn" - not
a 4-pin header as previously written. Retract the earlier "most likely
a factory test-jig interface, not a field service feature" read: the
adjacency strongly suggests S1 is wired in parallel with J16 as an
onboard equivalent of the customer's external green Test button, and
the "TEST 464 PASSED" sticker (cited as evidence) is just an unrelated
QC-pass label. Firmware only ever found one button-hold flag
(DAT_014a), consistent with one logical button. Not proven without a
continuity check between S1's pads and J16's terminals.

Also fixed: display is 4-digit, not 3-digit.

Co-Authored-By: Claude <noreply@anthropic.com>
@andy778
andy778 merged commit e75fc18 into main Jul 21, 2026
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andy778 deleted the docs/correct-test-button-note branch July 21, 2026 09:20
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