Technics SL-P999 Service Manual

(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......... 0.5ms.
Input coupling. .. AC (both CH. 1
and 2)
.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
Trigger mode...
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 100mvV (CH. 1)
200mV (CH. 2)
SWEEP........ 0.5ms.
Input coupling. . AC (both CH. 1
an
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 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, 6.
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 noe
(+) to the OSC termina! on the servo gain adjuster.
Oscilloscope setting: VOLT 100 mV (CH. 1)
SWEEP........ 0.5ms.
Input coupling. .AC (both CH. 1
and 2)
-NORM (trigger
CH. 2)
. Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
Trigger mode ..
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5. Set the servo gain adjuster’s gain switch to position “1”,
and adjust VR106 until the jitter contained in the
signal waveform on CH. 1 is minimized as shown below.
Disconnect the servo gain adjuster’s leads from the
player.
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itter should be minimized.
(9) CHECK OF PLAY OPERATION AFTER ADJUSTMENT
Checking Skip Search
. Play an ordinary musical program disc.
. Press the skip button to check for normal skip search
operation (in both the forward and reverse directions).
Checking Manual Search
. Play an ordinary musical program disc.
. Press the manual search button to check for smooth
manual search operations at either low or high speed
(in both the forward and reverse directions).
¢ Connection of servo gain adjuster
Audio-frequency oscillator
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Oscillator connection
(SZZP1017F ) GND OSC arenlnale
@ON/OFF switch
i)
Selector
a1
72
tp3TP2 °
TP1
@Q—~
Oscilloscope Qscilloscope
connection
xo terminals
OO} Tp2 TP3 TPt
CHi9 _ 9CH2
G |CH1
-9V GND +9V
Chassis
(Main) (Ground) (Main)
e Adjustment of D/A converter circuit
(1) DISTORTION ADJUSTMENT
1. Connect the distortion analyser to the LINE OUT
terminal and ground.
2. Switch the player power ON, and play track 1 (1kHz
OdB) on the test disc (SZZP1014F).
(2) DAC GAIN ADJUSTMENT
. Connect the AC electronic voltmeter to the LINE
OUT terminal and ground.
. Short and with a clip.
. Switch the player power ON, and play track 5 (1kHz
—24dB) on the test disc (SZZP1014F).
(3) OFFSET VOLTAGE ADJUSTMENT
. Connect the distortion analyser to the LINE OUT
terminal and ground.
. Short and ground.
. Switch the player power ON, and play track 5 (1kHz
—24dB) on the test disc (SZZP1014F).
Checking Using Defect Disc
1. Play the 0.7mm black dot and the 0.7mm wedge on the
defect test disc (SZZP1054C) and verify that no sound
skip or noise occurs.
. Play the middle tracks of the uneven test disc and verify
that no sound skip or noise occurs.
Conversion connector
(SZZP1032F )
3. Adjust VR801 (Lch) and VR802 (Rch) so that the
distortion factor is minimized.
4. Adjust VR803 (Lch) and VR804 (Rch) so that the
output voltage is minimized.
4. Adjust VR805 (Lch) and VR806 (Rch) so that the
distortion factor is minimized.

Technics SL-P999 Specifications

General

Brand	Technics
Model	SL-P999
Category	CD Player
Language	English