Pioneer PL-990 Manual - Página 4
Navegue en línea o descargue pdf Manual para Amplificador Pioneer PL-990. Pioneer PL-990 24 páginas. Stereo turntable
También para Pioneer PL-990: Especificaciones (1 páginas), Manual de servicio (13 páginas), Manual de instrucciones (26 páginas), Manual de instrucciones (26 páginas)
BACKGROUND
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It appears that this Turntable model was designed with the capability of
having a PreAmp On/Off switch.
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This option seems to have only been enabled rarely, if ever.
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There is a hole molded in the plastic below the platter which allows access to the PreAmp PCB
where a switch would have been/could have been installed
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The PCB includes a location for a switch and nearly all of the electrical traces necessary for such a
switch
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Note that the PreAmplifier PCB in my turntable unit is significantly different
from the one described in a service manual available online.
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But the provision for a switch is available on both versions.
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My Turntable's PreAmp is based on a TI-DRV602 chip.