Pioneer PD-T303 Service Manual page 24

PD-T503
34
Oscilloscope Setting
Test Points
Vv H
TP1 Pin 2
(TRK. ERR)
0.5V/div 5 msec/div
Adjusting
Points
Grating
Grating
Fig. 9-4.
Slide angle U unit
Check items/
Adjustment
Specifications
Null Point
Maximum
amplitude
Adjustment Procedure
e Insert © screwdriver into the grating
adjustment hole, and turn to find the null
point (see Photo 9-1.).
Next, slowly turn © screwdriver in
counterclockwise direction from the null
point and adjust until the waveform
(tracking error signal) reaches maximum
amplitude (see Photo $—2.).
Note: Use caution since inserting (S)
screwdriver forcefully will cause the
pickup unit to float upward.
¢ Finally, confirm that there is no major
fluctuation in the P—P voltage of the
tracking error signal (do not insert the cutoff
4 kHz low-pass filter) when the pickup is
shifted to the innermost track and when the
pickup is shifted to the outermost track. If
there is a difference of more than + 10%,
re—adjust by turning the grating adjustment
screw to the maximum amplitude point of
the tracking error signal.
of
=
Tray 1
Perform this adjustment when an 8 cm disc is
not available and Grating adjustment (1)
cannot be performed.
Remove the tray 1 before performing this
adjustment.
¢ Removal of tray 1
1. Set tray 1 to OPEN position.
2. Remove screws €1), C2) holding tray 1 in
Fig. 9-4.
3. Move tray 1 in the direction of arrow in Fig.
g-5, and as detaching projection © of tray
1, free slide angle U unit from hook ©@ of
tray 1.
. Pull out tray 1 as raising its side of slide
angle U unit slightly.