Adjustments; Stylus Lowering Position Adjustment; End Detector Adjustment - Pioneer PL-44F Service Manual

9. ADJUSTMENTS
9.1 STYLUS LOWERING POSITION ADJUST.
M E N T
1. hess the OPEN/CLOSE key, pull the slide base
out forwards, place a 30cm record on the tun-
table platter, and set the correct Revolution by
the speed selector.
2. Press the START key to start play. Check the
direction and degree of stylus displacement at
this time.
(Estimate the approximate distance in mm that
the stylus lands from the lead-in gtoove).
3. Depending on the direction and degree of dis-
placement, adjust the adjustment screw indicat-
ed in Fig. 9.1with a small screwdriver.
* TUm the screw clockwise (as seen fromabove)
if the stylus lowers outside the lead-in gfoove.
* T\rrn the screw counter clockwise (as seen
from above) if the stylus lowers inside the
lead-in gloove.
* One half-tum of the screw corresponds to a
shift of about 9mm in the lowering position.
4. When using the PLS-2001S test record, adjust
the screw to obtain a count in the 305 to 317
range for lowering onto a 30cm record. And if
the GGF-021 test record is used, adjust to a
count between 6 and 30 for a 30cm record.
Nofes.'
* Remornl of the bonnet simplifbs adjustment oper-
ations. In thb case, djuetmentE can be performed from
the top of the eecutcleon couer.
* Do not hcline the turntable ouer too far, not apply
excesiue prcesuve to the adjustment acrew during the
ad,j tst me nt op eratio n.
9.2 END DETECTOR ADJUSTMENT
1. Remove the bonnet, svyitch the power on, press
the OPEN/CLOSE key, and pull the slide base
out forwards.
2. Press the MANUAL key to put the turntable
into manud play mode, and then switch the
power off.
3. Disconnect the CN2 and CN4 connectors on the
common circuit board, and connect a DC volt-
meter to pin l ard pin 3 (GND) of TP1.
4. Switch the power back on, move the stylus to a
position 47.5mm from the center spindle, and
read the voltage.
5. Then move the stylus to a position 57.5mm
away from the center spindle and read the
meter again. The difference between the two
voltage readings should be 5.6V t 0.2V. Adjust
VRl to obtain this difference.
Adjustment hole (in the base plate)
Fig. 9.1 Stylus Lowering Position Adjustment
Fig. 9.3 End Detector Adjustment 2
Screwdriver
Center spindle
Fig. 9.2 End detector Adjustment 1
fl
-l-
g
flrt"i fl
. U f l
1
1 A
Fig. 9.4 Adiustment Position