Pioneer PD-X99M Service Manual page 37

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Oscilloscope Test Adjusting Sts poche
Setting Points Points sus wee
specifications
a Bere
5 | TRACKING BALANCE ADJUSTMENT
iV 10mS | CN101 pin4 VR 5 Equal positive &
/div /div (TR.ER) (TR.BL) negative
amplitude
(A=B)
0.2V : CN105 pin1} Pickup angle Best eye pattern
div i (RF) adjustment
screw
AC-
coupling
40
Adjustment procedure
Press MANUAL SEARCH FWD key to move the pick-
up close to the midway of the disc.
Set GND level of Oscilloscope at the center.
Connect Oscilloscope to CN101 pin4 TR.ER (Tracking)
Error) through a L.P.F. shown in Fig. 7-2. Adjust VR5
TR.BL (Tracking Balance) so that the positive and
negative amplitude of the waveform become equal
as in photograph 7-7.
Press TRACK FWD key, PLAY key and PAUSE key by
turns to close all servos. (The PAUSE indicator should
be lit up)
Connect oscilloscope to CN105 pin1 RF (RF output)
through a 10k-ohm resistor.
Use a 5k-ohm resistor instead if the waveform is not
clear.
Adjust pickup angle adjustment screw to obtain the
clearest eye pattern as in photograph 7-8.
The optimum point of the adjustment is in the mid-
way between the two points from where the eye pat-
tern starts to deteriorate when the pickup angle
adjustment screw is turned clockwise or counter-
clockwise.