Technics SL-PJ27 - Page 13

(3)
. Connect the oscilloscope’s CH. 1 probe across @ Bien!
SL-PJ27
BEST EYE (PD BALANCE) ADJUSTMENT
(+) and BuNBwers (—) on the Servo P.C.B.
Oscilloscope setting: VOLT.......... 100 mV
Input coupling... AC
. Switch the player power ON, and play the 1kHz
(track 1) on the test disc (SZZP1054C).
. Adjust VR101 until the vertical fluctuation of RF
signal is minimized and the eye pattern is most
stretched.
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ai
B\\NSSES
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— aang
* Most stretched eye pattern.
(4)
on
FOCUS GAIN ADJUSTMENT
. Connect the servo gain adjuster to the player (see page
15).
. Set the servo gain adjuster’s gain switch to position “2”
and the ON/OFF switch to ON.
. Set up the AF oscillator output for 825Hz, 150 mVp-p,
and connect it across the OSC and GND terminals on the
servo gain adjuster.
. Connect oscilloscope’s CH. 1 and CH. 2 probes to the
servo gain adjuster’s TP1 and TP2 terminals, respectively
(TP3 is GND).
Oscilloscope setting: VOLT.......... 100 mV
(both channels)
SWEEP......... 0.2 ms.
Input coupling... AC
. Play the test disc (SZZP1014F or SZZP1054C).
. Set the servo gain adjuster’s gain switch to position ‘’3”,
and you will see a 825 Hz signal on the oscilloscope.
Adjust VR104 until the signal amplitudes on both
channels become identical to each other.
. Set the gain switch back to position 2”.
4 W
x Adjust VR104 until a equals b.
(5
—
TRACKING GAIN ADJUSTMENT
. Set up the AF oscillator output for 1.1 kHz, 150 mVp-p,
and connect it across the OSC and GND terminals on the
servo gain adjuster.
. Connect oscifloscope’s CH. 1 and CH. 2 probes to the servo
gain adjuster’s TP1 and TP2 terminals, respectively
(TP3 is GND).
Oscilloscope setting: VOLT .......... 100 mV
(both channels)
SWEEP......... 0.2 ms
Input coupling... AC
. Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
. Set the servo gain adjuster’s gain switch to position ‘1’,
and you will see a 1.1 kHz signal on the oscilloscope.
Adjust VR102 until the signal amplitudes on both
channels become identical to each other.
. Set the gain switch back to position “2°.
XK Adjust VR102 until a equals b.