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Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
Transistor TR6 switches the motor on and off. During the last two lines of an 'L print' the motor runs
slowly; this is accomplished by switching TR6 on and off, using the time constant R13/C8 in conjunction
with the phototransistor output.
The motor is fitted internally with a varistor ring suppressor. Without this it would generate so much
interference to make it unusable. It is unlikely, however, that this would occur.
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