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アンプ Pioneer PL-990のPDF マニュアルをオンラインで閲覧またはダウンロードできます。Pioneer PL-990 24 ページ。 Stereo turntable
Pioneer PL-990 にも： 仕様 (1 ページ), サービスマニュアル (13 ページ), 取扱説明書 (26 ページ), 取扱説明書 (26 ページ)

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Pioneer PL-990 マニュアル
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.