Pioneer PD-X99M Service Manual page 39

PD-xXS3S9SM
42
Oscilloscope
: Test
Setting
Points
AF Osc.
output
terminal
CH-1
CN101 pin6
{FO.IN)
and
AF Osc.
output
CH-2
CN101 pin1
(FO.OT)
Photograph 7-12
Low gain
Adjusting
Points
Check items/
Adjustment
specifications
AF Osc.
output
control
VR3 Symmetrical
(FO.GA) Lissajous figures
Photograph 7-13
Optimum Gain
Adjustment procedure
Connect Oscilloscope to the output terminal of AF os-
cillator and adjust its output to 88OHz and 0.2Vp-p.
(The AF oscillator output should be adjusted before
the connection described below.)
Press TRACK FWD key, PLAY key and PAUSE key by
turns to close all servos.
Connect Oscilloscope, AF oscillator and a resistor to
the player as shown in Fig. 7-6.
Set Oscilloscope to X-Y mode.
Adjust VR3 FO.GA (Focus Gain) so that the Lissajous
figures become symmetrical. (see photograph 7-13)
CN101
Pin6
(FO.IN) |
Pind
(GND)
Pin1 Om
{FO.OT)
56k 2
Photograph 7-14
High gain