Sony PS-212A - Section 3 Adjustments (continued); Motor Amp Offset and Hall Device Gain Adjustment

2A
PS-212A
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PS-212A
“
Motor Amp Offset Adjustment and Hall Device Gain Adjustment
Sra
erec
ne
ae
Oot
nau
ee
——
.
1.
Short
the
terminal
pins
as
shown.
5.
Connect
VTVM
Q)
or
oscilloscope
to
H2
and
ee
.
adjust
RV6
for
OV
dc
VI'VM
reading
or
so
that
the waveform
on
oscilloscope
becomes
as
shown.
6. Connect VTVM (1) to H2 and adjust RV4 for
2.3V ac reading on VTVM.
2. Connect three diodes(10E2) as shown.
3. Connect VTVM @ or oscilloscope to H1 and
adjust RV5 for 0 V dc VT VM reading or so that
the waveform on oscilloscope becomes as
shown.
4. Connect VITVM @ to H1 and adjust RV3 for Note: Set the sweep time longer as for easy
2.3 V ac reading on VT VM.
waveform checking.
oe
Short the
terminal pins.
RV3 RV4
(H1) (H2)
speed
detecting
head
RV6
RV5
(H2) (H1)
Set the head deck as shown.
VTVM
Make sure that the VT VM reading is 10—5OmV 33 rpm
ac, 10—50 mV ac
If necessary, adjust the position of the head
deck by loosening the adjustment screw.
Note: Make sure that the head does not touch
the turntable.
3-2, ELECTRICAL ADJUSTMENTS
Turntable
Speed
Adjustment
:
If correct speed cannot be obtained by adjusting |
the PITCH control knob, adjust RV1 or RV2. A |
: OV
1. Set the PITCH control knob to the mechanical- |
mid
position.
A=B
|
am J
Set the SPEED selector knob to “33” or “45”
position and adjust RVI or RV2Z so that the
stroboscope pattern appears stationary.
ground
3 diodes
(10 E2)
t
RV2 RVI
(45 rpm) (33 rpm)
— 10 — 7 . —11-—