Sony PS-X7 - Page 14

Turntable Speed Adjustment
1.
Disconnect the. white lead wire and adjust
RV201 so that the stroboscope pattern appears
stationary.
Connect the white lead wire and make sure
that the stroboscope pattern appears stationary
after changing the turntable speed by hand.
Disconnect the
white lead wire.
SONY-00830 / DRUCK 4
RV201
PS-X6/X7 PS-X6/X7
Hall Device Gain Adjustment (33 '/3 rpm)
1. Disconnect the white lead wire and connect the
regulated power supply as shown below.
regulated dc
: power supply (variable)
[ZZ] 7.5V de
~Y
Disconnect the
white lead wire.
control panel side
servo amp/system
control circuit board
transistor circuit board
RV202
(H1)
ADJUSTMENT LOCATION
Connect VTVM to HI and adjust RV202 for
1.9V ac reading on VTVM.
Connect VTVM to H2 and adjust RV203 for
1.9V ac reading on VTVM.
RV205 (H2)
OFFSET
avz08 tH) 3
RV203 [SPEED | RV202 RV203
(H2)
(H1)
(H2)
Motor Amp Offset ‘Adjustment (33 !/3 rpm)
1.
Disconnect
the
white
lead
wire
and
connect
the
2.
Connect
VTVM
or
oscilloscope
to
H1
and
regulated
power
supply
as
shown
below.
adjust
RV204
for
OV
dc
VTVM
reading
or
the
waveform on oscilloscope as shown below.
wilval
Hibeaeen
(variable)
3.
Connect
VTVM
or
oscilloscope
to
H2
and
kd i adjust RV205 for OV dc VTVM reading or the
(exe) waveform on oscilloscope as shown below.
Waveform on Oscilloscope:
Note: Set the sweep time to longer for easy
checking the waveform.
Disconnect the
white. lead wire.
A A
Ov OV
RV204 (H1) B B
A=8 A=B
RV205 (H2)
transistor circuit board
oscilloscope