Acorn BBC Master 128, Руководство по обслуживанию

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Master Series Service Manual
Replace the speaker and battery unit, first plugging the two
connectors into their correct positions on the board, the battery
connector to PL8 either way round, and the speaker connector to PL9
either way round. Note that although the battery connector can be
plugged either way round, it must locate on all three pins or the
polarity will be wrong. Check carefully.
Replace the keyboard. Replace the 4 screws, 3 to the lower case and 1
to the power supply unit. Be careful to reconnect the keyboard ribbon
sockets so that all the pins are engaged; it is easy to displace the
connectors one pin to right or left.
Make one final check that all reconnections have been made correctly,
especially the power supplies which will short circuit if any two are
reversed.
Replace the lid, and insert and tighten the four fixing screws.
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