PB45E0A AMP CONTROL P.C.B. (Otari drawing 3-6649) in KiCad 10

This is otarimx5050.com's redraw of Otari's circuit diagram 3-6649 for the MX-5050 BQ-II's AMP control board,
from the fold-out sheet in the BQ-II instruction and maintenance manual (OS3-031). Parts sit at Otari's positions
and follow its wire routes; the printed boxes are re-lettered, with the Japanese labels glossed in English.

The symbol library (lib/), the SPICE models (models/parts.lib) and the drawing sheet are in this folder, so the
project opens and simulates in KiCad 10 with nothing else installed.

To simulate: open pb45e0a.kicad_pro, open the schematic and start the simulator (Inspect > Simulator). The test bench
V1 to V7 is on the sheet: the +15 V, -15 V and +5 V supplies, the two off-board ground returns (AF-B17, AF-B18), the
EXT OSC input at 0 V, and the EQ select at +15 V (the Control PCB's low-speed state). The sheet's .op directive gives
the DC operating point. For a power-on run use the transient command

    .tran 100u 4 0 uic

and probe AF-A13 (the shift-register clock, about 53 Hz between 1.8 and 12.1 V) or the + side of C603 (the mute
timer, about 2.0 V at 2.4 s). MUTE A and MUTE B have no load on the sheet.

This is a simulation of the drawing, not of a physical board. The scenarios, their checks and the bench additions
behind them are on https://otarimx5050.com/library/manuals/bq-ii-manual/amp-control-simulation/
