Technics SL-P200

BEST EYE (PD BALANCE) ADJUSTMENT
. Connect the oscilloscope’s CH. 1 probe across
(+) and (—) on the Servo P.C.B.
Oscilloscope setting:
Input coupling...
. Switch the player power ON, and play the 0.5 mm black
dot on the test disc (SZZP1014F or SZZP1054C).
. Adjust VR101 until the RF signal eye pattern amplitude
is maximized.
FOCUS GAIN ADJUSTMENT
. Connect the servo gain adjuster to the player (see page
. 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 TP? and TP2 terminals, respectively
(TP3 is GND).
Oscilloscope setting: VOLT
(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”.
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 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
(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”.
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(6) FOCUS OFFSET ADJUSTMENT
Note: Make sure that the servo gain adjuster’s gain switch
is set to position “2”,
1. Connect the oscilloscope’s CH. 1 probe across
(+) and (—) on the Servo P.C.B. and its CH. 2
probe (+) to VR104’s terminal.
Oscilloscope setting: VOLT 100 mV (CH. 1)
100 mV (CH. 2)
SWEEP......... 0.2 ms.
Input coupling. .. AC (both CH. 1
and 2)
Trigger mode ....NORM (trigger
CH. 1.)
. Switch the player power ON, and play track 9 on the
test disc (SZZP1057C).
. Trigger the oscilloscope’s CH. 1 so that the following
waveforms are observed. Adjust VR105 until the dip in
the RF signal envelope on CH. 1 is smooth and the signal
amplitude on CH. 2 is minimized, i.e. when amplitude A
equals amplitude B.
(7) TRACKING OFFSET ADJUSTMENT
Note: Make sure that the servo gain adjuster’s gain switch
is set to position “2”.
1. Connect the oscilloscope’s CH. 1 probe across
(+) and (—) on the Servo P.C.B., and its
CH. 2 probe (+) to VR102’s terminal.
Oscilloscope setting: VOLT 100 mV (CH. 1)
100 mV (CH. 2)
SWEEP........ 0.2 ms.
Input coupling. . AC (both CH. 1
and 2)
Trigger mode. .. NORM (trigger
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. Switch the player power ON, and play track 9 on the
test disc (SZZP1057C).
. Trigger the oscilloscope’s CH. 1 so that the following
waveforms are observed. Adjust VR103 until the dip in
the RF signal envelope on CH. 1 is smooth and the
signal amplitude on CH. 2 is minimized, i.e. when
amplitude A equals amplitude B.
TRACKING BALANCE ADJUSTMENT
. Make sure that servo gain adjuster’s gain switch is set to
position 2’,
. Set up the AF oscillator output for 1.1 kHz, 600 mVp-p,
and connect it across the OSC and GND terminals on the
servo gain adjuster.
. Connect oscilloscope’s CH. 1 probe across (+)
and (—) on the Servo P.C.B. and CH. 2 probe
(+) to the OSC terminal on the servo gain adjuster.
100 mV (CH. 1)
200 mV (CH. 2)
SWEEP........ 0.1 ms.
Input coupling. .AC (both CH. 1
and 2)
Trigger mode .. .NORM (trigger
CH. 2)
Oscilloscope setting: VOLT.
. Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
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5. Set the servo gain adjuster’s gain switch toposition “1°,
and adjust VR106 until the jitter contiined in the
signal waveform on CH. 1 is minimized as shown below.
6. Disconnect the servo gain adjuster’s leads from the
player.
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