Horizontal Dd Offset Adjustment; Band Sensor Offset Adjustment - Pioneer PL-88F Service Manual

4. Depending on the degtee of displacement, adjust
the adjustment screw in the head shell (see Fig.
9.2) with a small screwdriver.
o T\rrn the adjustment screw clockwise if the
stylus lowers in the track on the outside of the
prograrnmed track.
o Turn the adjustment screw counter clockwise if
the stylus lowers inside the programmed track.
o One full turn of the screw conesponds to a shift
of 0.2mm in the lowering position.
5. hoceed with programmed play again (excluding
the first track from the program) and check that
the stylus lowers correctly between tracks.
6. When adjusting with the GGF-021 test record,
set the sensitivity switch to the HIGH position,
and then adjust the screw to obtain the lkHz
output signal for three to four seconds when the
stylus is lowered in front of the second track of
the GGF-021record.
7. After completing the adjustment, proceed with
programmed play, and check that the lkHz
output slgnal is obtained for three to four
seconds for tracks after the first track, and that
the lkHz is also obtained for tracks after the
sixth track.
Note:
If the conect lowering position cannat be obtained by
this adjustment methd, or if the stylut lowering operation
is unstedy,
proceed
with the "Horizontal DD offet
adjustment" and. then repeat the aboue djustment.
9.3 HORIZONTAL DD OFFSET ADJUSTMENT
1. Remove the bonnet, press the OPEN/CLOSE
key, and pull the slide base forward.
2. Press the manual key for lead-in of the tonearm,
and press the arm elevation key to put the
tonearm in the UP position.
3. Connect a DC voltmeter between the humped
jumpers JP43 and JP44 (see Fig. 9.3).
4. Adjust VRl to obtain a meter reading of t50mV
max.
5. Then press the arm elevation key to lower the
tonearm and check that the tonearm descent is
perpendicular.
9.4 BAND SENSOR OFFSET ADJUSTMENT
1. Remove the bonnet and P1 and P2 lead wires
indicated in Fig.9.4 (using a soldering iron to
disconnect the lead wires).
2. Using a small screwdriver, turn VR2 and VR3
fully clockwise as seen from above.
3. Connect a DC voltmeter between P2 and PB (TP
terminals) of CN8, and adjust VR4 to obtain a
meter reading of t0.1V max.
Fig. 9,3 Horizontal DD Offset Adjustment
R E D
WHT
B L U
Disconnect lead wires
with soldering iron
Fig. 9.4 Band Sensor Offset Adjustment