Pioneer PL-990 Manual - Halaman 4

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Pioneer PL-990 Manual
BACKGROUND
It appears that this Turntable model was designed with the capability of
having a PreAmp On/Off switch.
This option seems to have only been enabled rarely, if ever.
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
The PCB includes a location for a switch and nearly all of the electrical traces necessary for such a
switch
Note that the PreAmplifier PCB in my turntable unit is significantly different
from the one described in a service manual available online.
But the provision for a switch is available on both versions.
My Turntable's PreAmp is based on a TI-DRV602 chip.