Horizontal Dd Cancel Adjustment; Stylus Height Adjustment - Pioneer PL-88F Service Manual

6. Check that the P13 waveform is ahead of the
P12 as indicated in Fig. 9.8, and that a, b, c,
and d in this diagram are all greater than l2msec.
The tonearm must always move from the spindle
towards the outer edge of the record. If it moves
towards the center of the record, the P12 wave-
form should be atread of the P13 waveform.
Lead wire l C l p i n Adjustment control
Address A sensor c N 2 P 1 6 P12
vR202
Address B sensor
cN2 P14
P l 3
VR201
9.7 HORIZONTAL DD CANCEL ADJUSTMENT
1. Remove the bonnet, press the START key, and
switch the power off when the tonearm comes
close to the lowering position for 30cm records.
The tonearm remains elevated in this case.
2. Connect an oscillator to P9 and P10 in the
socket side of the CN 2 connector, connect an
oscilloscope to P11 and P12, and short P10 to
P 1 1 .
3. Generate a 10Vp-p 45OHz sine wave signal in
the oscillator, and check that a 450H2 sine wave
slgral is displayed in the oscillocope.
4. Adjust VR203 to obtain a 120mVp-p (t10mV)
waveform signal in the oscillocope.
5. Move the tonearm slowly by hand towards the
center of the record. As the tonearm is moved
towards the center from the 30cm lowering
position, the waveform amplitude is gradually
decreased, reaching a minimum at a point a
little before the spindle. Moving the tonearm
any further inwards results in the amplitude
increasing Eatn.
6. Set the tonearm in the position where minimum
amplitude was achieved, and readjust VR203 to
obtain an amplitude of less than 2OmVp-p
(approx). (See Fig. 9.11).
9.8 STYLUS HEIGHT ADJUSTMENT
1. Remove the bonnet and switch the power on.
Press the OPEN/CLOSE key and pull the slide
base out forwards.
2.Place a record on the tr:rntable platter and press
the MANUAL
button to move the tonearm
forward.
3. While holding the tonearm in the left hand,
adjust the adjustment screw with
a wrench
(1.5mm) passed through the adjustment hole as
shown in Fig. 9.12.
4. Adjust the stylus tip to a height 5 to ?mm above
the record.
Fig. 9.10 Horizontal DD CancelAdiustment
20mV max.
Fig. 9.1 1 Adjustment Waveform
Wrench (1.5mm)
Height adjustment screw
n n n---f-
30cm lowerins Position
/
\ / \ /
\
| 1 2 o m V
V
Final point
Fig. 9.12 Stylus Tip adjustment Screw
2 6