Sony PS-11 - Motor Gain Adjustment; Offset Adjustment Procedure

PS-1
switch
R30
R34
regulated
power supply
servo amp board
switch board
servo amp board
‘Remove ORG
lead wire.
RV2 {H1)
Motor Gain Adjustment
RV3 (H2) RV5 (H2) RV4 (H1)
Offset Adjustment
‘Note: Offset means the unbalanced voltages of the hall
element and IC.
When the offset voltage has changed, it causes the
wow and flutter,
1. Turn the switch to H1 position and adjust RV4 for
~OVdce VTVM reading or screen pattern. of
oscilloscope. =
2. Turn the switch to H2 position and adjust RV5 for
OVdc VTVM reading or screen pattern of
oscilloscope.
Oscilloscope screen pattern:
1. Turn the switch to H1 position and adjust RV2 for
2.3 Vac VTVM reading.
2. Turn the switch to H2 position and adjust RV3 for
2.3 Vac VIVM reading.
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